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