source/lib/privileges_basic.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Privileges handling functions
   4    Copyright (C) Jean François Micouleau       1998-2001
   5    Copyright (C) Simo Sorce                     2002-2003
   6    Copyright (C) Gerald (Jerry) Carter          2005
   7    Copyright (C) Michael Adam                   2007
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 /*
  25  * Basic privileges functions (mask-operations and conversion
  26  * functions between the different formats (se_priv, privset, luid)
  27  * moved here * from lib/privileges.c to minimize linker deps.
  28  *
  29  * generally SID- and LUID-related code is left in lib/privileges.c
  30  *
  31  * some extra functions to hide privs array from lib/privileges.c
  32  */
  33
  34 #include "includes.h"
  35
  36 const SE_PRIV se_priv_all         = SE_ALL_PRIVS;
  37 static const SE_PRIV se_priv_end  = SE_END;
  38
  39 /* Define variables for all privileges so we can use the
  40    SE_PRIV* in the various se_priv_XXX() functions */
  41
  42 const SE_PRIV se_priv_none       = SE_NONE;
  43 const SE_PRIV se_machine_account = SE_MACHINE_ACCOUNT;
  44 const SE_PRIV se_print_operator  = SE_PRINT_OPERATOR;
  45 const SE_PRIV se_add_users       = SE_ADD_USERS;
  46 const SE_PRIV se_disk_operators  = SE_DISK_OPERATOR;
  47 const SE_PRIV se_remote_shutdown = SE_REMOTE_SHUTDOWN;
  48 const SE_PRIV se_restore         = SE_RESTORE;
  49 const SE_PRIV se_take_ownership  = SE_TAKE_OWNERSHIP;
  50
  51 /********************************************************************
  52  This is a list of privileges reported by a WIndows 2000 SP4 AD DC
  53  just for reference purposes (and I know the LUID is not guaranteed
  54  across reboots):
  55
  56             SeCreateTokenPrivilege  Create a token object ( 0x0, 0x2 )
  57      SeAssignPrimaryTokenPrivilege  Replace a process level token ( 0x0, 0x3 )
  58              SeLockMemoryPrivilege  Lock pages in memory ( 0x0, 0x4 )
  59           SeIncreaseQuotaPrivilege  Increase quotas ( 0x0, 0x5 )
  60          SeMachineAccountPrivilege  Add workstations to domain ( 0x0, 0x6 )
  61                     SeTcbPrivilege  Act as part of the operating system ( 0x0, 0x7 )
  62                SeSecurityPrivilege  Manage auditing and security log ( 0x0, 0x8 )
  63           SeTakeOwnershipPrivilege  Take ownership of files or other objects ( 0x0, 0x9 )
  64              SeLoadDriverPrivilege  Load and unload device drivers ( 0x0, 0xa )
  65           SeSystemProfilePrivilege  Profile system performance ( 0x0, 0xb )
  66              SeSystemtimePrivilege  Change the system time ( 0x0, 0xc )
  67    SeProfileSingleProcessPrivilege  Profile single process ( 0x0, 0xd )
  68    SeIncreaseBasePriorityPrivilege  Increase scheduling priority ( 0x0, 0xe )
  69          SeCreatePagefilePrivilege  Create a pagefile ( 0x0, 0xf )
  70         SeCreatePermanentPrivilege  Create permanent shared objects ( 0x0, 0x10 )
  71                  SeBackupPrivilege  Back up files and directories ( 0x0, 0x11 )
  72                 SeRestorePrivilege  Restore files and directories ( 0x0, 0x12 )
  73                SeShutdownPrivilege  Shut down the system ( 0x0, 0x13 )
  74                   SeDebugPrivilege  Debug programs ( 0x0, 0x14 )
  75                   SeAuditPrivilege  Generate security audits ( 0x0, 0x15 )
  76       SeSystemEnvironmentPrivilege  Modify firmware environment values ( 0x0, 0x16 )
  77            SeChangeNotifyPrivilege  Bypass traverse checking ( 0x0, 0x17 )
  78          SeRemoteShutdownPrivilege  Force shutdown from a remote system ( 0x0, 0x18 )
  79                  SeUndockPrivilege  Remove computer from docking station ( 0x0, 0x19 )
  80               SeSyncAgentPrivilege  Synchronize directory service data ( 0x0, 0x1a )
  81        SeEnableDelegationPrivilege  Enable computer and user accounts to be trusted for delegation ( 0x0, 0x1b )
  82            SeManageVolumePrivilege  Perform volume maintenance tasks ( 0x0, 0x1c )
  83             SeImpersonatePrivilege  Impersonate a client after authentication ( 0x0, 0x1d )
  84            SeCreateGlobalPrivilege  Create global objects ( 0x0, 0x1e )
  85
  86  ********************************************************************/
  87
  88 /* we have to define the LUID here due to a horrible check by printmig.exe
  89    that requires the SeBackupPrivilege match what is in Windows.  So match
  90    those that we implement and start Samba privileges at 0x1001 */
  91
  92 PRIVS privs[] = {
  93 #if 0   /* usrmgr will display these twice if you include them.  We don't
  94            use them but we'll keep the bitmasks reserved in privileges.h anyways */
  95
  96         {SE_NETWORK_LOGON,      "SeNetworkLogonRight",          "Access this computer from network",       { 0x0, 0x0 }},
  97         {SE_INTERACTIVE_LOGON,  "SeInteractiveLogonRight",      "Log on locally",                          { 0x0, 0x0 }},
  98         {SE_BATCH_LOGON,        "SeBatchLogonRight",            "Log on as a batch job",                   { 0x0, 0x0 }},
  99         {SE_SERVICE_LOGON,      "SeServiceLogonRight",          "Log on as a service",                     { 0x0, 0x0 }},
 100 #endif
 101         {SE_MACHINE_ACCOUNT,    "SeMachineAccountPrivilege",    "Add machines to domain",                  { 0x0, 0x0006 }},
 102         {SE_TAKE_OWNERSHIP,     "SeTakeOwnershipPrivilege",     "Take ownership of files or other objects",{ 0x0, 0x0009 }},
 103         {SE_BACKUP,             "SeBackupPrivilege",            "Back up files and directories",           { 0x0, 0x0011 }},
 104         {SE_RESTORE,            "SeRestorePrivilege",           "Restore files and directories",           { 0x0, 0x0012 }},
 105         {SE_REMOTE_SHUTDOWN,    "SeRemoteShutdownPrivilege",    "Force shutdown from a remote system",     { 0x0, 0x0018 }},
 106
 107         {SE_PRINT_OPERATOR,     "SePrintOperatorPrivilege",     "Manage printers",                         { 0x0, 0x1001 }},
 108         {SE_ADD_USERS,          "SeAddUsersPrivilege",          "Add users and groups to the domain",      { 0x0, 0x1002 }},
 109         {SE_DISK_OPERATOR,      "SeDiskOperatorPrivilege",      "Manage disk shares",                      { 0x0, 0x1003 }},
 110
 111         {SE_END, "", "", { 0x0, 0x0 }}
 112 };
 113
 114 /***************************************************************************
 115  copy an SE_PRIV structure
 116 ****************************************************************************/
 117
 118 BOOL se_priv_copy( SE_PRIV *dst, const SE_PRIV *src )
 119 {
 120         if ( !dst || !src )
 121                 return False;
 122
 123         memcpy( dst, src, sizeof(SE_PRIV) );
 124
 125         return True;
 126 }
 127
 128 /***************************************************************************
 129  put all privileges into a mask
 130 ****************************************************************************/
 131
 132 BOOL se_priv_put_all_privileges(SE_PRIV *mask)
 133 {
 134         int i;
 135         uint32 num_privs = count_all_privileges();
 136
 137         if (!se_priv_copy(mask, &se_priv_none)) {
 138                 return False;
 139         }
 140         for ( i=0; i<num_privs; i++ ) {
 141                 se_priv_add(mask, &privs[i].se_priv);
 142         }
 143         return True;
 144 }
 145
 146 /***************************************************************************
 147  combine 2 SE_PRIV structures and store the resulting set in mew_mask
 148 ****************************************************************************/
 149
 150 void se_priv_add( SE_PRIV *mask, const SE_PRIV *addpriv )
 151 {
 152         int i;
 153
 154         for ( i=0; i<SE_PRIV_MASKSIZE; i++ ) {
 155                 mask->mask[i] |= addpriv->mask[i];
 156         }
 157 }
 158
 159 /***************************************************************************
 160  remove one SE_PRIV sytucture from another and store the resulting set
 161  in mew_mask
 162 ****************************************************************************/
 163
 164 void se_priv_remove( SE_PRIV *mask, const SE_PRIV *removepriv )
 165 {
 166         int i;
 167
 168         for ( i=0; i<SE_PRIV_MASKSIZE; i++ ) {
 169                 mask->mask[i] &= ~removepriv->mask[i];
 170         }
 171 }
 172
 173 /***************************************************************************
 174  invert a given SE_PRIV and store the set in new_mask
 175 ****************************************************************************/
 176
 177 static void se_priv_invert( SE_PRIV *new_mask, const SE_PRIV *mask )
 178 {
 179         SE_PRIV allprivs;
 180
 181         se_priv_copy( &allprivs, &se_priv_all );
 182         se_priv_remove( &allprivs, mask );
 183         se_priv_copy( new_mask, &allprivs );
 184 }
 185
 186 /***************************************************************************
 187  check if 2 SE_PRIV structure are equal
 188 ****************************************************************************/
 189
 190 BOOL se_priv_equal( const SE_PRIV *mask1, const SE_PRIV *mask2 )
 191 {
 192         return ( memcmp(mask1, mask2, sizeof(SE_PRIV)) == 0 );
 193 }
 194
 195 /***************************************************************************
 196  check if a SE_PRIV has any assigned privileges
 197 ****************************************************************************/
 198
 199 static BOOL se_priv_empty( const SE_PRIV *mask )
 200 {
 201         SE_PRIV p1;
 202         int i;
 203
 204         se_priv_copy( &p1, mask );
 205
 206         for ( i=0; i<SE_PRIV_MASKSIZE; i++ ) {
 207                 p1.mask[i] &= se_priv_all.mask[i];
 208         }
 209
 210         return se_priv_equal( &p1, &se_priv_none );
 211 }
 212
 213 /*********************************************************************
 214  Lookup the SE_PRIV value for a privilege name
 215 *********************************************************************/
 216
 217 BOOL se_priv_from_name( const char *name, SE_PRIV *mask )
 218 {
 219         int i;
 220
 221         for ( i=0; !se_priv_equal(&privs[i].se_priv, &se_priv_end); i++ ) {
 222                 if ( strequal( privs[i].name, name ) ) {
 223                         se_priv_copy( mask, &privs[i].se_priv );
 224                         return True;
 225                 }
 226         }
 227
 228         return False;
 229 }
 230
 231 /***************************************************************************
 232  dump an SE_PRIV structure to the log files
 233 ****************************************************************************/
 234
 235 void dump_se_priv( int dbg_cl, int dbg_lvl, const SE_PRIV *mask )
 236 {
 237         int i;
 238
 239         DEBUGADDC( dbg_cl, dbg_lvl,("SE_PRIV "));
 240
 241         for ( i=0; i<SE_PRIV_MASKSIZE; i++ ) {
 242                 DEBUGADDC( dbg_cl, dbg_lvl,(" 0x%x", mask->mask[i] ));
 243         }
 244
 245         DEBUGADDC( dbg_cl, dbg_lvl, ("\n"));
 246 }
 247
 248 /****************************************************************************
 249  check if the privilege is in the privilege list
 250 ****************************************************************************/
 251
 252 BOOL is_privilege_assigned(const SE_PRIV *privileges,
 253                            const SE_PRIV *check)
 254 {
 255         SE_PRIV p1, p2;
 256
 257         if ( !privileges || !check )
 258                 return False;
 259
 260         /* everyone has privileges if you aren't checking for any */
 261
 262         if ( se_priv_empty( check ) ) {
 263                 DEBUG(1,("is_privilege_assigned: no privileges in check_mask!\n"));
 264                 return True;
 265         }
 266
 267         se_priv_copy( &p1, check );
 268
 269         /* invert the SE_PRIV we want to check for and remove that from the
 270            original set.  If we are left with the SE_PRIV we are checking
 271            for then return True */
 272
 273         se_priv_invert( &p1, check );
 274         se_priv_copy( &p2, privileges );
 275         se_priv_remove( &p2, &p1 );
 276
 277         return se_priv_equal( &p2, check );
 278 }
 279
 280 /****************************************************************************
 281  check if the privilege is in the privilege list
 282 ****************************************************************************/
 283
 284 static BOOL is_any_privilege_assigned( SE_PRIV *privileges, const SE_PRIV *check )
 285 {
 286         SE_PRIV p1, p2;
 287
 288         if ( !privileges || !check )
 289                 return False;
 290
 291         /* everyone has privileges if you aren't checking for any */
 292
 293         if ( se_priv_empty( check ) ) {
 294                 DEBUG(1,("is_any_privilege_assigned: no privileges in check_mask!\n"));
 295                 return True;
 296         }
 297
 298         se_priv_copy( &p1, check );
 299
 300         /* invert the SE_PRIV we want to check for and remove that from the
 301            original set.  If we are left with the SE_PRIV we are checking
 302            for then return True */
 303
 304         se_priv_invert( &p1, check );
 305         se_priv_copy( &p2, privileges );
 306         se_priv_remove( &p2, &p1 );
 307
 308         /* see if we have any bits left */
 309
 310         return !se_priv_empty( &p2 );
 311 }
 312
 313 /*********************************************************************
 314  Generate the LUID_ATTR structure based on a bitmask
 315 *********************************************************************/
 316
 317 const char* get_privilege_dispname( const char *name )
 318 {
 319         int i;
 320
 321         for ( i=0; !se_priv_equal(&privs[i].se_priv, &se_priv_end); i++ ) {
 322
 323                 if ( strequal( privs[i].name, name ) ) {
 324                         return privs[i].description;
 325                 }
 326         }
 327
 328         return NULL;
 329 }
 330
 331 /****************************************************************************
 332  initialise a privilege list and set the talloc context
 333  ****************************************************************************/
 334
 335 /****************************************************************************
 336  Does the user have the specified privilege ?  We only deal with one privilege
 337  at a time here.
 338 *****************************************************************************/
 339
 340 BOOL user_has_privileges(const NT_USER_TOKEN *token, const SE_PRIV *privilege)
 341 {
 342         if ( !token )
 343                 return False;
 344
 345         return is_privilege_assigned( &token->privileges, privilege );
 346 }
 347
 348 /****************************************************************************
 349  Does the user have any of the specified privileges ?  We only deal with one privilege
 350  at a time here.
 351 *****************************************************************************/
 352
 353 BOOL user_has_any_privilege(NT_USER_TOKEN *token, const SE_PRIV *privilege)
 354 {
 355         if ( !token )
 356                 return False;
 357
 358         return is_any_privilege_assigned( &token->privileges, privilege );
 359 }
 360
 361 /*******************************************************************
 362  return the number of elements in the privlege array
 363 *******************************************************************/
 364
 365 int count_all_privileges( void )
 366 {
 367         /*
 368          * The -1 is due to the weird SE_END record...
 369          */
 370         return (sizeof(privs) / sizeof(privs[0])) - 1;
 371 }
 372
 373
 374 /*********************************************************************
 375  Generate the LUID_ATTR structure based on a bitmask
 376  The assumption here is that the privilege has already been validated
 377  so we are guaranteed to find it in the list.
 378 *********************************************************************/
 379
 380 LUID_ATTR get_privilege_luid( SE_PRIV *mask )
 381 {
 382         LUID_ATTR priv_luid;
 383         int i;
 384
 385         ZERO_STRUCT( priv_luid );
 386
 387         for ( i=0; !se_priv_equal(&privs[i].se_priv, &se_priv_end); i++ ) {
 388
 389                 if ( se_priv_equal( &privs[i].se_priv, mask ) ) {
 390                         priv_luid.luid = privs[i].luid;
 391                         break;
 392                 }
 393         }
 394
 395         return priv_luid;
 396 }
 397
 398 /****************************************************************************
 399  Convert a LUID to a named string
 400 ****************************************************************************/
 401
 402 const char *luid_to_privilege_name(const LUID *set)
 403 {
 404         int i;
 405
 406         if (set->high != 0)
 407                 return NULL;
 408
 409         for ( i=0; !se_priv_equal(&privs[i].se_priv, &se_priv_end); i++ ) {
 410                 if ( set->low == privs[i].luid.low ) {
 411                         return privs[i].name;
 412                 }
 413         }
 414
 415         return NULL;
 416 }
 417
 418
 419 /****************************************************************************
 420  add a privilege to a privilege array
 421  ****************************************************************************/
 422
 423 static BOOL privilege_set_add(PRIVILEGE_SET *priv_set, LUID_ATTR set)
 424 {
 425         LUID_ATTR *new_set;
 426
 427         /* we can allocate memory to add the new privilege */
 428
 429         new_set = TALLOC_REALLOC_ARRAY(priv_set->mem_ctx, priv_set->set, LUID_ATTR, priv_set->count + 1);
 430         if ( !new_set ) {
 431                 DEBUG(0,("privilege_set_add: failed to allocate memory!\n"));
 432                 return False;
 433         }
 434
 435         new_set[priv_set->count].luid.high = set.luid.high;
 436         new_set[priv_set->count].luid.low = set.luid.low;
 437         new_set[priv_set->count].attr = set.attr;
 438
 439         priv_set->count++;
 440         priv_set->set = new_set;
 441
 442         return True;
 443 }
 444
 445 /*******************************************************************
 446 *******************************************************************/
 447
 448 BOOL se_priv_to_privilege_set( PRIVILEGE_SET *set, SE_PRIV *mask )
 449 {
 450         int i;
 451         uint32 num_privs = count_all_privileges();
 452         LUID_ATTR luid;
 453
 454         luid.attr = 0;
 455         luid.luid.high = 0;
 456
 457         for ( i=0; i<num_privs; i++ ) {
 458                 if ( !is_privilege_assigned(mask, &privs[i].se_priv) )
 459                         continue;
 460
 461                 luid.luid = privs[i].luid;
 462
 463                 if ( !privilege_set_add( set, luid ) )
 464                         return False;
 465         }
 466
 467         return True;
 468 }
 469
 470 /*******************************************************************
 471 *******************************************************************/
 472
 473 static BOOL luid_to_se_priv( LUID *luid, SE_PRIV *mask )
 474 {
 475         int i;
 476         uint32 num_privs = count_all_privileges();
 477
 478         for ( i=0; i<num_privs; i++ ) {
 479                 if ( luid->low == privs[i].luid.low ) {
 480                         se_priv_copy( mask, &privs[i].se_priv );
 481                         return True;
 482                 }
 483         }
 484
 485         return False;
 486 }
 487
 488 /*******************************************************************
 489 *******************************************************************/
 490
 491 BOOL privilege_set_to_se_priv( SE_PRIV *mask, PRIVILEGE_SET *privset )
 492 {
 493         int i;
 494
 495         ZERO_STRUCTP( mask );
 496
 497         for ( i=0; i<privset->count; i++ ) {
 498                 SE_PRIV r;
 499
 500                 /* sanity check for invalid privilege.  we really
 501                    only care about the low 32 bits */
 502
 503                 if ( privset->set[i].luid.high != 0 )
 504                         return False;
 505
 506                 if ( luid_to_se_priv( &privset->set[i].luid, &r ) )
 507                         se_priv_add( mask, &r );
 508         }
 509
 510         return True;
 511 }
 512