source/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 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 #include "includes.h"
  26
  27 #define PRIVPREFIX              "PRIV_"
  28
  29 typedef struct {
  30         size_t count;
  31         DOM_SID *list;
  32 } SID_LIST;
  33
  34 typedef struct {
  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 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_string_static(sid) );
  58
  59         data = tdb_fetch_bystring( tdb, keystr );
  60
  61         if ( !data.dptr ) {
  62                 DEBUG(3,("get_privileges: No privileges assigned to SID [%s]\n",
  63                         sid_string_static(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 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_string_static(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 privleges for all sids the in 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 set:\n",
 127                         sid_string_static(&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 (!add_sid_to_array( NULL, &sid, &priv->sids.list, &priv->sids.count )) {
 188                 return 0;
 189         }
 190
 191         return 0;
 192 }
 193
 194 /*********************************************************************
 195  Retreive list of privileged SIDs (for _lsa_enumerate_accounts()
 196 *********************************************************************/
 197
 198 NTSTATUS privilege_enumerate_accounts(DOM_SID **sids, int *num_sids)
 199 {
 200         TDB_CONTEXT *tdb = get_account_pol_tdb();
 201         PRIV_SID_LIST priv;
 202
 203         if (!tdb) {
 204                 return NT_STATUS_ACCESS_DENIED;
 205         }
 206
 207         ZERO_STRUCT(priv);
 208
 209         se_priv_copy( &priv.privilege, &se_priv_none );
 210
 211         tdb_traverse( tdb, priv_traverse_fn, &priv);
 212
 213         /* give the memory away; caller will free */
 214
 215         *sids      = priv.sids.list;
 216         *num_sids  = priv.sids.count;
 217
 218         return NT_STATUS_OK;
 219 }
 220
 221 /***************************************************************************
 222  Add privilege to sid
 223 ****************************************************************************/
 224
 225 BOOL grant_privilege(const DOM_SID *sid, const SE_PRIV *priv_mask)
 226 {
 227         SE_PRIV old_mask, new_mask;
 228
 229         ZERO_STRUCT( old_mask );
 230         ZERO_STRUCT( new_mask );
 231
 232         if ( get_privileges( sid, &old_mask ) )
 233                 se_priv_copy( &new_mask, &old_mask );
 234         else
 235                 se_priv_copy( &new_mask, &se_priv_none );
 236
 237         se_priv_add( &new_mask, priv_mask );
 238
 239         DEBUG(10,("grant_privilege: %s\n", sid_string_static(sid)));
 240
 241         DEBUGADD( 10, ("original privilege mask:\n"));
 242         dump_se_priv( DBGC_ALL, 10, &old_mask );
 243
 244         DEBUGADD( 10, ("new privilege mask:\n"));
 245         dump_se_priv( DBGC_ALL, 10, &new_mask );
 246
 247         return set_privileges( sid, &new_mask );
 248 }
 249
 250 /*********************************************************************
 251  Add a privilege based on its name
 252 *********************************************************************/
 253
 254 BOOL grant_privilege_by_name(DOM_SID *sid, const char *name)
 255 {
 256         SE_PRIV mask;
 257
 258         if (! se_priv_from_name(name, &mask)) {
 259                 DEBUG(3, ("grant_privilege_by_name: "
 260                           "No Such Privilege Found (%s)\n", name));
 261                 return False;
 262         }
 263
 264         return grant_privilege( sid, &mask );
 265 }
 266
 267 /***************************************************************************
 268  Remove privilege from sid
 269 ****************************************************************************/
 270
 271 BOOL revoke_privilege(const DOM_SID *sid, const SE_PRIV *priv_mask)
 272 {
 273         SE_PRIV mask;
 274
 275         /* if the user has no privileges, then we can't revoke any */
 276
 277         if ( !get_privileges( sid, &mask ) )
 278                 return True;
 279
 280         DEBUG(10,("revoke_privilege: %s\n", sid_string_static(sid)));
 281
 282         DEBUGADD( 10, ("original privilege mask:\n"));
 283         dump_se_priv( DBGC_ALL, 10, &mask );
 284
 285         se_priv_remove( &mask, priv_mask );
 286
 287         DEBUGADD( 10, ("new privilege mask:\n"));
 288         dump_se_priv( DBGC_ALL, 10, &mask );
 289
 290         return set_privileges( sid, &mask );
 291 }
 292
 293 /*********************************************************************
 294  Revoke all privileges
 295 *********************************************************************/
 296
 297 BOOL revoke_all_privileges( DOM_SID *sid )
 298 {
 299         return revoke_privilege( sid, &se_priv_all );
 300 }
 301
 302 /*********************************************************************
 303  Add a privilege based on its name
 304 *********************************************************************/
 305
 306 BOOL revoke_privilege_by_name(DOM_SID *sid, const char *name)
 307 {
 308         SE_PRIV mask;
 309
 310         if (! se_priv_from_name(name, &mask)) {
 311                 DEBUG(3, ("revoke_privilege_by_name: "
 312                           "No Such Privilege Found (%s)\n", name));
 313                 return False;
 314         }
 315
 316         return revoke_privilege(sid, &mask);
 317
 318 }
 319
 320 /***************************************************************************
 321  Retrieve the SIDs assigned to a given privilege
 322 ****************************************************************************/
 323
 324 NTSTATUS privilege_create_account(const DOM_SID *sid )
 325 {
 326         return ( grant_privilege(sid, &se_priv_none) ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL);
 327 }
 328
 329 /****************************************************************************
 330  initialise a privilege list and set the talloc context
 331  ****************************************************************************/
 332
 333 NTSTATUS privilege_set_init(PRIVILEGE_SET *priv_set)
 334 {
 335         TALLOC_CTX *mem_ctx;
 336
 337         ZERO_STRUCTP( priv_set );
 338
 339         mem_ctx = talloc_init("privilege set");
 340         if ( !mem_ctx ) {
 341                 DEBUG(0,("privilege_set_init: failed to initialize talloc ctx!\n"));
 342                 return NT_STATUS_NO_MEMORY;
 343         }
 344
 345         priv_set->mem_ctx = mem_ctx;
 346
 347         return NT_STATUS_OK;
 348 }
 349
 350 /****************************************************************************
 351   initialise a privilege list and with someone else's talloc context
 352 ****************************************************************************/
 353
 354 NTSTATUS privilege_set_init_by_ctx(TALLOC_CTX *mem_ctx, PRIVILEGE_SET *priv_set)
 355 {
 356         ZERO_STRUCTP( priv_set );
 357
 358         priv_set->mem_ctx = mem_ctx;
 359         priv_set->ext_ctx = True;
 360
 361         return NT_STATUS_OK;
 362 }
 363
 364 /****************************************************************************
 365  Free all memory used by a PRIVILEGE_SET
 366 ****************************************************************************/
 367
 368 void privilege_set_free(PRIVILEGE_SET *priv_set)
 369 {
 370         if ( !priv_set )
 371                 return;
 372
 373         if ( !( priv_set->ext_ctx ) )
 374                 talloc_destroy( priv_set->mem_ctx );
 375
 376         ZERO_STRUCTP( priv_set );
 377 }
 378
 379 /****************************************************************************
 380  duplicate alloc luid_attr
 381  ****************************************************************************/
 382
 383 NTSTATUS dup_luid_attr(TALLOC_CTX *mem_ctx, LUID_ATTR **new_la, LUID_ATTR *old_la, int count)
 384 {
 385         int i;
 386
 387         if ( !old_la )
 388                 return NT_STATUS_OK;
 389
 390         if (count) {
 391                 *new_la = TALLOC_ARRAY(mem_ctx, LUID_ATTR, count);
 392                 if ( !*new_la ) {
 393                         DEBUG(0,("dup_luid_attr: failed to alloc new LUID_ATTR array [%d]\n", count));
 394                         return NT_STATUS_NO_MEMORY;
 395                 }
 396         } else {
 397                 *new_la = NULL;
 398         }
 399
 400         for (i=0; i<count; i++) {
 401                 (*new_la)[i].luid.high = old_la[i].luid.high;
 402                 (*new_la)[i].luid.low = old_la[i].luid.low;
 403                 (*new_la)[i].attr = old_la[i].attr;
 404         }
 405
 406         return NT_STATUS_OK;
 407 }
 408
 409 /*******************************************************************
 410 *******************************************************************/
 411
 412 BOOL is_privileged_sid( const DOM_SID *sid )
 413 {
 414         SE_PRIV mask;
 415
 416         return get_privileges( sid, &mask );
 417 }
 418
 419 /*******************************************************************
 420 *******************************************************************/
 421
 422 BOOL grant_all_privileges( const DOM_SID *sid )
 423 {
 424         SE_PRIV mask;
 425
 426         if (!se_priv_put_all_privileges(&mask)) {
 427                 return False;
 428         }
 429
 430         return grant_privilege( sid, &mask );
 431 }