source3/lib/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
   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 #include "includes.h"
  25
  26 #define PRIVPREFIX              "PRIV_"
  27
  28 typedef struct {
  29         size_t count;
  30         DOM_SID *list;
  31 } SID_LIST;
  32
  33 typedef struct {
  34         TALLOC_CTX *mem_ctx;
  35         SE_PRIV privilege;
  36         SID_LIST sids;
  37 } PRIV_SID_LIST;
  38
  39
  40 static bool get_privileges( const DOM_SID *sid, SE_PRIV *mask )
  41 {
  42         TDB_CONTEXT *tdb = get_account_pol_tdb();
  43         fstring tmp, keystr;
  44         TDB_DATA data;
  45
  46         /* Fail if the admin has not enable privileges */
  47
  48         if ( !lp_enable_privileges() ) {
  49                 return False;
  50         }
  51
  52         if ( !tdb )
  53                 return False;
  54
  55         /* PRIV_<SID> (NULL terminated) as the key */
  56
  57         fstr_sprintf(keystr, "%s%s", PRIVPREFIX, sid_to_fstring(tmp, sid));
  58
  59         data = tdb_fetch_bystring( tdb, keystr );
  60
  61         if ( !data.dptr ) {
  62                 DEBUG(3, ("get_privileges: No privileges assigned to SID "
  63                           "[%s]\n", sid_string_dbg(sid)));
  64                 return False;
  65         }
  66
  67         SMB_ASSERT( data.dsize == sizeof( SE_PRIV ) );
  68
  69         se_priv_copy( mask, (SE_PRIV*)data.dptr );
  70         SAFE_FREE(data.dptr);
  71
  72         return True;
  73 }
  74
  75 /***************************************************************************
  76  Store the privilege mask (set) for a given SID
  77 ****************************************************************************/
  78
  79 static bool set_privileges( const DOM_SID *sid, SE_PRIV *mask )
  80 {
  81         TDB_CONTEXT *tdb = get_account_pol_tdb();
  82         fstring tmp, keystr;
  83         TDB_DATA data;
  84
  85         if ( !lp_enable_privileges() )
  86                 return False;
  87
  88         if ( !tdb )
  89                 return False;
  90
  91         if ( !sid || (sid->num_auths == 0) ) {
  92                 DEBUG(0,("set_privileges: Refusing to store empty SID!\n"));
  93                 return False;
  94         }
  95
  96         /* PRIV_<SID> (NULL terminated) as the key */
  97
  98         fstr_sprintf(keystr, "%s%s", PRIVPREFIX, sid_to_fstring(tmp, sid));
  99
 100         /* no packing.  static size structure, just write it out */
 101
 102         data.dptr  = (uint8 *)mask;
 103         data.dsize = sizeof(SE_PRIV);
 104
 105         return ( tdb_store_bystring(tdb, keystr, data, TDB_REPLACE) != -1 );
 106 }
 107
 108 /*********************************************************************
 109  get a list of all privileges for all sids in the list
 110 *********************************************************************/
 111
 112 bool get_privileges_for_sids(SE_PRIV *privileges, DOM_SID *slist, int scount)
 113 {
 114         SE_PRIV mask;
 115         int i;
 116         bool found = False;
 117
 118         se_priv_copy( privileges, &se_priv_none );
 119
 120         for ( i=0; i<scount; i++ ) {
 121                 /* don't add unless we actually have a privilege assigned */
 122
 123                 if ( !get_privileges( &slist[i], &mask ) )
 124                         continue;
 125
 126                 DEBUG(5,("get_privileges_for_sids: sid = %s\nPrivilege "
 127                          "set:\n", sid_string_dbg(&slist[i])));
 128                 dump_se_priv( DBGC_ALL, 5, &mask );
 129
 130                 se_priv_add( privileges, &mask );
 131                 found = True;
 132         }
 133
 134         return found;
 135 }
 136
 137
 138 /*********************************************************************
 139  travseral functions for privilege_enumerate_accounts
 140 *********************************************************************/
 141
 142 static int priv_traverse_fn(TDB_CONTEXT *t, TDB_DATA key, TDB_DATA data, void *state)
 143 {
 144         PRIV_SID_LIST *priv = (PRIV_SID_LIST *)state;
 145         int  prefixlen = strlen(PRIVPREFIX);
 146         DOM_SID sid;
 147         fstring sid_string;
 148
 149         /* easy check first */
 150
 151         if ( data.dsize != sizeof(SE_PRIV) )
 152                 return 0;
 153
 154         /* check we have a PRIV_+SID entry */
 155
 156         if ( strncmp((const char *)key.dptr, PRIVPREFIX, prefixlen) != 0)
 157                 return 0;
 158
 159         /* check to see if we are looking for a particular privilege */
 160
 161         if ( !se_priv_equal(&priv->privilege, &se_priv_none) ) {
 162                 SE_PRIV mask;
 163
 164                 se_priv_copy( &mask, (SE_PRIV*)data.dptr );
 165
 166                 /* if the SID does not have the specified privilege
 167                    then just return */
 168
 169                 if ( !is_privilege_assigned( &mask, &priv->privilege) )
 170                         return 0;
 171         }
 172
 173         fstrcpy( sid_string, (const char *)&key.dptr[strlen(PRIVPREFIX)] );
 174
 175         /* this is a last ditch safety check to preventing returning
 176            and invalid SID (i've somehow run into this on development branches) */
 177
 178         if ( strcmp( "S-0-0", sid_string ) == 0 )
 179                 return 0;
 180
 181         if ( !string_to_sid(&sid, sid_string) ) {
 182                 DEBUG(0,("travsersal_fn_enum__acct: Could not convert SID [%s]\n",
 183                         sid_string));
 184                 return 0;
 185         }
 186
 187         if (!NT_STATUS_IS_OK(add_sid_to_array(priv->mem_ctx, &sid,
 188                                               &priv->sids.list,
 189                                               &priv->sids.count)))
 190         {
 191                 return 0;
 192         }
 193
 194         return 0;
 195 }
 196
 197 /*********************************************************************
 198  Retreive list of privileged SIDs (for _lsa_enumerate_accounts()
 199 *********************************************************************/
 200
 201 NTSTATUS privilege_enumerate_accounts(DOM_SID **sids, int *num_sids)
 202 {
 203         TDB_CONTEXT *tdb = get_account_pol_tdb();
 204         PRIV_SID_LIST priv;
 205
 206         if (!tdb) {
 207                 return NT_STATUS_ACCESS_DENIED;
 208         }
 209
 210         ZERO_STRUCT(priv);
 211
 212         se_priv_copy( &priv.privilege, &se_priv_none );
 213
 214         tdb_traverse( tdb, priv_traverse_fn, &priv);
 215
 216         /* give the memory away; caller will free */
 217
 218         *sids      = priv.sids.list;
 219         *num_sids  = priv.sids.count;
 220
 221         return NT_STATUS_OK;
 222 }
 223
 224 /*********************************************************************
 225  Retrieve list of SIDs granted a particular privilege
 226 *********************************************************************/
 227
 228 NTSTATUS privilege_enum_sids(const SE_PRIV *mask, TALLOC_CTX *mem_ctx,
 229                              DOM_SID **sids, int *num_sids)
 230 {
 231         TDB_CONTEXT *tdb = get_account_pol_tdb();
 232         PRIV_SID_LIST priv;
 233
 234         if (!tdb) {
 235                 return NT_STATUS_ACCESS_DENIED;
 236         }
 237
 238         ZERO_STRUCT(priv);
 239
 240         se_priv_copy(&priv.privilege, mask);
 241         priv.mem_ctx = mem_ctx;
 242
 243         tdb_traverse( tdb, priv_traverse_fn, &priv);
 244
 245         /* give the memory away; caller will free */
 246
 247         *sids      = priv.sids.list;
 248         *num_sids  = priv.sids.count;
 249
 250         return NT_STATUS_OK;
 251 }
 252
 253 /***************************************************************************
 254  Add privilege to sid
 255 ****************************************************************************/
 256
 257 bool grant_privilege(const DOM_SID *sid, const SE_PRIV *priv_mask)
 258 {
 259         SE_PRIV old_mask, new_mask;
 260
 261         ZERO_STRUCT( old_mask );
 262         ZERO_STRUCT( new_mask );
 263
 264         if ( get_privileges( sid, &old_mask ) )
 265                 se_priv_copy( &new_mask, &old_mask );
 266         else
 267                 se_priv_copy( &new_mask, &se_priv_none );
 268
 269         se_priv_add( &new_mask, priv_mask );
 270
 271         DEBUG(10,("grant_privilege: %s\n", sid_string_dbg(sid)));
 272
 273         DEBUGADD( 10, ("original privilege mask:\n"));
 274         dump_se_priv( DBGC_ALL, 10, &old_mask );
 275
 276         DEBUGADD( 10, ("new privilege mask:\n"));
 277         dump_se_priv( DBGC_ALL, 10, &new_mask );
 278
 279         return set_privileges( sid, &new_mask );
 280 }
 281
 282 /*********************************************************************
 283  Add a privilege based on its name
 284 *********************************************************************/
 285
 286 bool grant_privilege_by_name(DOM_SID *sid, const char *name)
 287 {
 288         SE_PRIV mask;
 289
 290         if (! se_priv_from_name(name, &mask)) {
 291                 DEBUG(3, ("grant_privilege_by_name: "
 292                           "No Such Privilege Found (%s)\n", name));
 293                 return False;
 294         }
 295
 296         return grant_privilege( sid, &mask );
 297 }
 298
 299 /***************************************************************************
 300  Remove privilege from sid
 301 ****************************************************************************/
 302
 303 bool revoke_privilege(const DOM_SID *sid, const SE_PRIV *priv_mask)
 304 {
 305         SE_PRIV mask;
 306
 307         /* if the user has no privileges, then we can't revoke any */
 308
 309         if ( !get_privileges( sid, &mask ) )
 310                 return True;
 311
 312         DEBUG(10,("revoke_privilege: %s\n", sid_string_dbg(sid)));
 313
 314         DEBUGADD( 10, ("original privilege mask:\n"));
 315         dump_se_priv( DBGC_ALL, 10, &mask );
 316
 317         se_priv_remove( &mask, priv_mask );
 318
 319         DEBUGADD( 10, ("new privilege mask:\n"));
 320         dump_se_priv( DBGC_ALL, 10, &mask );
 321
 322         return set_privileges( sid, &mask );
 323 }
 324
 325 /*********************************************************************
 326  Revoke all privileges
 327 *********************************************************************/
 328
 329 bool revoke_all_privileges( DOM_SID *sid )
 330 {
 331         return revoke_privilege( sid, &se_priv_all );
 332 }
 333
 334 /*********************************************************************
 335  Add a privilege based on its name
 336 *********************************************************************/
 337
 338 bool revoke_privilege_by_name(DOM_SID *sid, const char *name)
 339 {
 340         SE_PRIV mask;
 341
 342         if (! se_priv_from_name(name, &mask)) {
 343                 DEBUG(3, ("revoke_privilege_by_name: "
 344                           "No Such Privilege Found (%s)\n", name));
 345                 return False;
 346         }
 347
 348         return revoke_privilege(sid, &mask);
 349
 350 }
 351
 352 /***************************************************************************
 353  Retrieve the SIDs assigned to a given privilege
 354 ****************************************************************************/
 355
 356 NTSTATUS privilege_create_account(const DOM_SID *sid )
 357 {
 358         return ( grant_privilege(sid, &se_priv_none) ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL);
 359 }
 360
 361 /****************************************************************************
 362  initialise a privilege list and set the talloc context
 363  ****************************************************************************/
 364
 365 NTSTATUS privilege_set_init(PRIVILEGE_SET *priv_set)
 366 {
 367         TALLOC_CTX *mem_ctx;
 368
 369         ZERO_STRUCTP( priv_set );
 370
 371         mem_ctx = talloc_init("privilege set");
 372         if ( !mem_ctx ) {
 373                 DEBUG(0,("privilege_set_init: failed to initialize talloc ctx!\n"));
 374                 return NT_STATUS_NO_MEMORY;
 375         }
 376
 377         priv_set->mem_ctx = mem_ctx;
 378
 379         return NT_STATUS_OK;
 380 }
 381
 382 /****************************************************************************
 383   initialise a privilege list and with someone else's talloc context
 384 ****************************************************************************/
 385
 386 NTSTATUS privilege_set_init_by_ctx(TALLOC_CTX *mem_ctx, PRIVILEGE_SET *priv_set)
 387 {
 388         ZERO_STRUCTP( priv_set );
 389
 390         priv_set->mem_ctx = mem_ctx;
 391         priv_set->ext_ctx = True;
 392
 393         return NT_STATUS_OK;
 394 }
 395
 396 /****************************************************************************
 397  Free all memory used by a PRIVILEGE_SET
 398 ****************************************************************************/
 399
 400 void privilege_set_free(PRIVILEGE_SET *priv_set)
 401 {
 402         if ( !priv_set )
 403                 return;
 404
 405         if ( !( priv_set->ext_ctx ) )
 406                 talloc_destroy( priv_set->mem_ctx );
 407
 408         ZERO_STRUCTP( priv_set );
 409 }
 410
 411 /****************************************************************************
 412  duplicate alloc luid_attr
 413  ****************************************************************************/
 414
 415 NTSTATUS dup_luid_attr(TALLOC_CTX *mem_ctx, LUID_ATTR **new_la, LUID_ATTR *old_la, int count)
 416 {
 417         int i;
 418
 419         if ( !old_la )
 420                 return NT_STATUS_OK;
 421
 422         if (count) {
 423                 *new_la = TALLOC_ARRAY(mem_ctx, LUID_ATTR, count);
 424                 if ( !*new_la ) {
 425                         DEBUG(0,("dup_luid_attr: failed to alloc new LUID_ATTR array [%d]\n", count));
 426                         return NT_STATUS_NO_MEMORY;
 427                 }
 428         } else {
 429                 *new_la = NULL;
 430         }
 431
 432         for (i=0; i<count; i++) {
 433                 (*new_la)[i].luid.high = old_la[i].luid.high;
 434                 (*new_la)[i].luid.low = old_la[i].luid.low;
 435                 (*new_la)[i].attr = old_la[i].attr;
 436         }
 437
 438         return NT_STATUS_OK;
 439 }
 440
 441 /*******************************************************************
 442 *******************************************************************/
 443
 444 bool is_privileged_sid( const DOM_SID *sid )
 445 {
 446         SE_PRIV mask;
 447
 448         return get_privileges( sid, &mask );
 449 }
 450
 451 /*******************************************************************
 452 *******************************************************************/
 453
 454 bool grant_all_privileges( const DOM_SID *sid )
 455 {
 456         SE_PRIV mask;
 457
 458         if (!se_priv_put_all_privileges(&mask)) {
 459                 return False;
 460         }
 461
 462         return grant_privilege( sid, &mask );
 463 }