libcli/security/privileges.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    Copyright (C) Andrew Bartlett                2010
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  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 uint64_t se_priv_all         = SE_ALL_PRIVS;
  37 static const uint64_t se_priv_end  = SE_END;
  38
  39 /* Define variables for all privileges so we can use the
  40    uint64_t* in the various se_priv_XXX() functions */
  41
  42 const uint64_t se_priv_none       = SE_NONE;
  43 const uint64_t se_machine_account = SE_MACHINE_ACCOUNT;
  44 const uint64_t se_print_operator  = SE_PRINT_OPERATOR;
  45 const uint64_t se_add_users       = SE_ADD_USERS;
  46 const uint64_t se_disk_operators  = SE_DISK_OPERATOR;
  47 const uint64_t se_remote_shutdown = SE_REMOTE_SHUTDOWN;
  48 const uint64_t se_restore         = SE_RESTORE;
  49 const uint64_t se_take_ownership  = SE_TAKE_OWNERSHIP;
  50
  51 PRIVS privs[] = {
  52 #if 0   /* usrmgr will display these twice if you include them.  We don't
  53            use them but we'll keep the bitmasks reserved in privileges.h anyways */
  54
  55         {SE_NETWORK_LOGON,      "SeNetworkLogonRight",          "Access this computer from network",       0x0},
  56         {SE_INTERACTIVE_LOGON,  "SeInteractiveLogonRight",      "Log on locally",                          0x0},
  57         {SE_BATCH_LOGON,        "SeBatchLogonRight",            "Log on as a batch job",                   0x0},
  58         {SE_SERVICE_LOGON,      "SeServiceLogonRight",          "Log on as a service",                     0x0},
  59 #endif
  60         {SE_MACHINE_ACCOUNT,    "SeMachineAccountPrivilege",    "Add machines to domain",                  SEC_PRIV_MACHINE_ACCOUNT},
  61         {SE_TAKE_OWNERSHIP,     "SeTakeOwnershipPrivilege",     "Take ownership of files or other objects",SEC_PRIV_TAKE_OWNERSHIP},
  62         {SE_BACKUP,             "SeBackupPrivilege",            "Back up files and directories",           SEC_PRIV_BACKUP},
  63         {SE_RESTORE,            "SeRestorePrivilege",           "Restore files and directories",           SEC_PRIV_RESTORE},
  64         {SE_REMOTE_SHUTDOWN,    "SeRemoteShutdownPrivilege",    "Force shutdown from a remote system",     SEC_PRIV_REMOTE_SHUTDOWN},
  65
  66         {SE_PRINT_OPERATOR,     "SePrintOperatorPrivilege",     "Manage printers",                         SEC_PRIV_PRINT_OPERATOR},
  67         {SE_ADD_USERS,          "SeAddUsersPrivilege",          "Add users and groups to the domain",      SEC_PRIV_ADD_USERS},
  68         {SE_DISK_OPERATOR,      "SeDiskOperatorPrivilege",      "Manage disk shares",                      SEC_PRIV_DISK_OPERATOR},
  69
  70         {SE_END, "", "", 0x0}
  71 };
  72
  73 /***************************************************************************
  74  copy an uint64_t structure
  75 ****************************************************************************/
  76
  77 bool se_priv_copy( uint64_t *dst, const uint64_t *src )
  78 {
  79         if ( !dst || !src )
  80                 return False;
  81
  82         memcpy( dst, src, sizeof(uint64_t) );
  83
  84         return True;
  85 }
  86
  87 /***************************************************************************
  88  put all privileges into a mask
  89 ****************************************************************************/
  90
  91 bool se_priv_put_all_privileges(uint64_t *privilege_mask)
  92 {
  93         int i;
  94         uint32 num_privs = count_all_privileges();
  95
  96         if (!se_priv_copy(privilege_mask, &se_priv_none)) {
  97                 return False;
  98         }
  99         for ( i=0; i<num_privs; i++ ) {
 100                 se_priv_add(privilege_mask, &privs[i].privilege_mask);
 101         }
 102         return True;
 103 }
 104
 105 /***************************************************************************
 106  combine 2 uint64_t structures and store the resulting set in mew_mask
 107 ****************************************************************************/
 108
 109 void se_priv_add( uint64_t *privilege_mask, const uint64_t *addpriv )
 110 {
 111         *privilege_mask |= *addpriv;
 112 }
 113
 114 /***************************************************************************
 115  remove one uint64_t sytucture from another and store the resulting set
 116  in mew_mask
 117 ****************************************************************************/
 118
 119 void se_priv_remove( uint64_t *privilege_mask, const uint64_t *removepriv )
 120 {
 121         *privilege_mask &= ~*removepriv;
 122 }
 123
 124 /***************************************************************************
 125  invert a given uint64_t and store the set in new_mask
 126 ****************************************************************************/
 127
 128 static void se_priv_invert( uint64_t *new_mask, const uint64_t *privilege_mask )
 129 {
 130         uint64_t allprivs;
 131
 132         se_priv_copy( &allprivs, &se_priv_all );
 133         se_priv_remove( &allprivs, privilege_mask );
 134         se_priv_copy( new_mask, &allprivs );
 135 }
 136
 137 /***************************************************************************
 138  check if 2 uint64_t structure are equal
 139 ****************************************************************************/
 140
 141 bool se_priv_equal( const uint64_t *privilege_mask1, const uint64_t *privilege_mask2 )
 142 {
 143         return *privilege_mask1 == *privilege_mask2;
 144 }
 145
 146 /***************************************************************************
 147  check if a uint64_t has any assigned privileges
 148 ****************************************************************************/
 149
 150 static bool se_priv_empty( const uint64_t *privilege_mask )
 151 {
 152         uint64_t p1;
 153
 154         se_priv_copy( &p1, privilege_mask );
 155
 156         p1 &= se_priv_all;
 157
 158         return se_priv_equal( &p1, &se_priv_none );
 159 }
 160
 161 /*********************************************************************
 162  Lookup the uint64_t value for a privilege name
 163 *********************************************************************/
 164
 165 bool se_priv_from_name( const char *name, uint64_t *privilege_mask )
 166 {
 167         int i;
 168
 169         for ( i=0; !se_priv_equal(&privs[i].privilege_mask, &se_priv_end); i++ ) {
 170                 if ( strequal( privs[i].name, name ) ) {
 171                         se_priv_copy( privilege_mask, &privs[i].privilege_mask );
 172                         return True;
 173                 }
 174         }
 175
 176         return False;
 177 }
 178
 179 /***************************************************************************
 180  dump an uint64_t structure to the log files
 181 ****************************************************************************/
 182
 183 void dump_se_priv( int dbg_cl, int dbg_lvl, const uint64_t *privilege_mask )
 184 {
 185         DEBUGADDC( dbg_cl, dbg_lvl,("uint64_t 0x%llx\n", (unsigned long long)*privilege_mask));
 186 }
 187
 188 /****************************************************************************
 189  check if the privilege is in the privilege list
 190 ****************************************************************************/
 191
 192 bool is_privilege_assigned(const uint64_t *privileges,
 193                            const uint64_t *check)
 194 {
 195         uint64_t p1, p2;
 196
 197         if ( !privileges || !check )
 198                 return False;
 199
 200         /* everyone has privileges if you aren't checking for any */
 201
 202         if ( se_priv_empty( check ) ) {
 203                 DEBUG(1,("is_privilege_assigned: no privileges in check_mask!\n"));
 204                 return True;
 205         }
 206
 207         se_priv_copy( &p1, check );
 208
 209         /* invert the uint64_t we want to check for and remove that from the
 210            original set.  If we are left with the uint64_t we are checking
 211            for then return True */
 212
 213         se_priv_invert( &p1, check );
 214         se_priv_copy( &p2, privileges );
 215         se_priv_remove( &p2, &p1 );
 216
 217         return se_priv_equal( &p2, check );
 218 }
 219
 220 /****************************************************************************
 221  check if the privilege is in the privilege list
 222 ****************************************************************************/
 223
 224 static bool is_any_privilege_assigned( uint64_t *privileges, const uint64_t *check )
 225 {
 226         uint64_t p1, p2;
 227
 228         if ( !privileges || !check )
 229                 return False;
 230
 231         /* everyone has privileges if you aren't checking for any */
 232
 233         if ( se_priv_empty( check ) ) {
 234                 DEBUG(1,("is_any_privilege_assigned: no privileges in check_mask!\n"));
 235                 return True;
 236         }
 237
 238         se_priv_copy( &p1, check );
 239
 240         /* invert the uint64_t we want to check for and remove that from the
 241            original set.  If we are left with the uint64_t we are checking
 242            for then return True */
 243
 244         se_priv_invert( &p1, check );
 245         se_priv_copy( &p2, privileges );
 246         se_priv_remove( &p2, &p1 );
 247
 248         /* see if we have any bits left */
 249
 250         return !se_priv_empty( &p2 );
 251 }
 252
 253 /*********************************************************************
 254  Generate the struct lsa_LUIDAttribute structure based on a bitmask
 255 *********************************************************************/
 256
 257 const char* get_privilege_dispname( const char *name )
 258 {
 259         int i;
 260
 261         if (!name) {
 262                 return NULL;
 263         }
 264
 265         for ( i=0; !se_priv_equal(&privs[i].privilege_mask, &se_priv_end); i++ ) {
 266
 267                 if ( strequal( privs[i].name, name ) ) {
 268                         return privs[i].description;
 269                 }
 270         }
 271
 272         return NULL;
 273 }
 274
 275 /****************************************************************************
 276  initialise a privilege list and set the talloc context
 277  ****************************************************************************/
 278
 279 /****************************************************************************
 280  Does the user have the specified privilege ?  We only deal with one privilege
 281  at a time here.
 282 *****************************************************************************/
 283
 284 bool user_has_privileges(const struct security_token *token, const uint64_t *privilege_bit)
 285 {
 286         if ( !token )
 287                 return False;
 288
 289         return is_privilege_assigned( &token->privilege_mask, privilege_bit );
 290 }
 291
 292 /****************************************************************************
 293  Does the user have any of the specified privileges ?  We only deal with one privilege
 294  at a time here.
 295 *****************************************************************************/
 296
 297 bool user_has_any_privilege(struct security_token *token, const uint64_t *privilege_mask)
 298 {
 299         if ( !token )
 300                 return False;
 301
 302         return is_any_privilege_assigned( &token->privilege_mask, privilege_mask );
 303 }
 304
 305 /*******************************************************************
 306  return the number of elements in the privlege array
 307 *******************************************************************/
 308
 309 int count_all_privileges( void )
 310 {
 311         /*
 312          * The -1 is due to the weird SE_END record...
 313          */
 314         return (sizeof(privs) / sizeof(privs[0])) - 1;
 315 }
 316
 317
 318 /*********************************************************************
 319  Generate the struct lsa_LUIDAttribute structure based on a bitmask
 320  The assumption here is that the privilege has already been validated
 321  so we are guaranteed to find it in the list.
 322 *********************************************************************/
 323
 324 struct lsa_LUIDAttribute get_privilege_luid( uint64_t *privilege_mask )
 325 {
 326         struct lsa_LUIDAttribute priv_luid;
 327         int i;
 328
 329         ZERO_STRUCT( priv_luid );
 330
 331         for ( i=0; !se_priv_equal(&privs[i].privilege_mask, &se_priv_end); i++ ) {
 332
 333                 if ( se_priv_equal( &privs[i].privilege_mask, privilege_mask ) ) {
 334                         priv_luid.luid.low = privs[i].luid;
 335                         priv_luid.luid.high = 0;
 336                         break;
 337                 }
 338         }
 339
 340         return priv_luid;
 341 }
 342
 343 /****************************************************************************
 344  Convert a LUID to a named string
 345 ****************************************************************************/
 346
 347 const char *luid_to_privilege_name(const struct lsa_LUID *set)
 348 {
 349         int i;
 350
 351         if (set->high != 0)
 352                 return NULL;
 353
 354         for ( i=0; !se_priv_equal(&privs[i].privilege_mask, &se_priv_end); i++ ) {
 355                 if ( set->low == privs[i].luid ) {
 356                         return privs[i].name;
 357                 }
 358         }
 359
 360         return NULL;
 361 }
 362
 363
 364 /****************************************************************************
 365  add a privilege to a privilege array
 366  ****************************************************************************/
 367
 368 static bool privilege_set_add(PRIVILEGE_SET *priv_set, struct lsa_LUIDAttribute set)
 369 {
 370         struct lsa_LUIDAttribute *new_set;
 371
 372         /* we can allocate memory to add the new privilege */
 373
 374         new_set = TALLOC_REALLOC_ARRAY(priv_set->mem_ctx, priv_set->set, struct lsa_LUIDAttribute, priv_set->count + 1);
 375         if ( !new_set ) {
 376                 DEBUG(0,("privilege_set_add: failed to allocate memory!\n"));
 377                 return False;
 378         }
 379
 380         new_set[priv_set->count].luid.high = set.luid.high;
 381         new_set[priv_set->count].luid.low = set.luid.low;
 382         new_set[priv_set->count].attribute = set.attribute;
 383
 384         priv_set->count++;
 385         priv_set->set = new_set;
 386
 387         return True;
 388 }
 389
 390 /*******************************************************************
 391 *******************************************************************/
 392
 393 bool se_priv_to_privilege_set( PRIVILEGE_SET *set, uint64_t *privilege_mask )
 394 {
 395         int i;
 396         uint32 num_privs = count_all_privileges();
 397         struct lsa_LUIDAttribute luid;
 398
 399         luid.attribute = 0;
 400         luid.luid.high = 0;
 401
 402         for ( i=0; i<num_privs; i++ ) {
 403                 if ( !is_privilege_assigned(privilege_mask, &privs[i].privilege_mask) )
 404                         continue;
 405
 406                 luid.luid.high = 0;
 407                 luid.luid.low = privs[i].luid;
 408
 409                 if ( !privilege_set_add( set, luid ) )
 410                         return False;
 411         }
 412
 413         return True;
 414 }
 415
 416 /*******************************************************************
 417 *******************************************************************/
 418
 419 static bool luid_to_se_priv( struct lsa_LUID *luid, uint64_t *privilege_mask )
 420 {
 421         int i;
 422         uint32 num_privs = count_all_privileges();
 423
 424         for ( i=0; i<num_privs; i++ ) {
 425                 if ( luid->low == privs[i].luid ) {
 426                         se_priv_copy( privilege_mask, &privs[i].privilege_mask );
 427                         return True;
 428                 }
 429         }
 430
 431         return False;
 432 }
 433
 434 /*******************************************************************
 435 *******************************************************************/
 436
 437 bool privilege_set_to_se_priv( uint64_t *privilege_mask, struct lsa_PrivilegeSet *privset )
 438 {
 439         int i;
 440
 441         ZERO_STRUCTP( privilege_mask );
 442
 443         for ( i=0; i<privset->count; i++ ) {
 444                 uint64_t r;
 445
 446                 /* sanity check for invalid privilege.  we really
 447                    only care about the low 32 bits */
 448
 449                 if ( privset->set[i].luid.high != 0 )
 450                         return False;
 451
 452                 if ( luid_to_se_priv( &privset->set[i].luid, &r ) )
 453                         se_priv_add( privilege_mask, &r );
 454         }
 455
 456         return True;
 457 }