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 #include "dbwrap.h"
  26 #include "libcli/security/privileges_private.h"
  27 #include "../libcli/security/security.h"
  28
  29 #define PRIVPREFIX              "PRIV_"
  30
  31 typedef struct {
  32         uint32_t count;
  33         struct dom_sid *list;
  34 } SID_LIST;
  35
  36 typedef struct {
  37         TALLOC_CTX *mem_ctx;
  38         uint64_t privilege;
  39         SID_LIST sids;
  40 } PRIV_SID_LIST;
  41
  42 /*
  43   interpret an old style SE_PRIV structure
  44  */
  45 static uint64_t map_old_SE_PRIV(unsigned char *dptr)
  46 {
  47         uint32_t *old_masks = (uint32_t *)dptr;
  48         /*
  49          * the old privileges code only ever used up to 0x800, except
  50          * for a special case of 'SE_ALL_PRIVS' which was 0xFFFFFFFF
  51          */
  52         if (old_masks[0] == 0xFFFFFFFF) {
  53                 /* they set all privileges */
  54                 return SE_ALL_PRIVS;
  55         }
  56
  57         /* the old code used the machine byte order, but we don't know
  58          * the byte order of the machine that wrote it. However we can
  59          * tell what byte order it was by taking advantage of the fact
  60          * that it only ever use up to 0x800
  61          */
  62         if (dptr[0] || dptr[1]) {
  63                 /* it was little endian */
  64                 return IVAL(dptr, 0);
  65         }
  66
  67         /* it was either zero or big-endian */
  68         return RIVAL(dptr, 0);
  69 }
  70
  71
  72 static bool get_privileges( const struct dom_sid *sid, uint64_t *mask )
  73 {
  74         struct db_context *db = get_account_pol_db();
  75         fstring tmp, keystr;
  76         TDB_DATA data;
  77
  78         /* Fail if the admin has not enable privileges */
  79
  80         if ( !lp_enable_privileges() ) {
  81                 return False;
  82         }
  83
  84         if ( db == NULL )
  85                 return False;
  86
  87         /* PRIV_<SID> (NULL terminated) as the key */
  88
  89         fstr_sprintf(keystr, "%s%s", PRIVPREFIX, sid_to_fstring(tmp, sid));
  90
  91         data = dbwrap_fetch_bystring( db, talloc_tos(), keystr );
  92
  93         if ( !data.dptr ) {
  94                 DEBUG(3, ("get_privileges: No privileges assigned to SID "
  95                           "[%s]\n", sid_string_dbg(sid)));
  96                 return False;
  97         }
  98
  99         if (data.dsize == 4*4) {
 100                 /* it's an old style SE_PRIV structure. */
 101                 *mask = map_old_SE_PRIV(data.dptr);
 102         } else {
 103                 if (data.dsize != sizeof( uint64_t ) ) {
 104                         DEBUG(3, ("get_privileges: Invalid privileges record assigned to SID "
 105                                   "[%s]\n", sid_string_dbg(sid)));
 106                         return False;
 107                 }
 108
 109                 *mask = BVAL(data.dptr, 0);
 110         }
 111
 112         TALLOC_FREE(data.dptr);
 113
 114         return True;
 115 }
 116
 117 /***************************************************************************
 118  Store the privilege mask (set) for a given SID
 119 ****************************************************************************/
 120
 121 static bool set_privileges( const struct dom_sid *sid, uint64_t mask )
 122 {
 123         struct db_context *db = get_account_pol_db();
 124         uint8_t privbuf[8];
 125         fstring tmp, keystr;
 126         TDB_DATA data;
 127
 128         if ( !lp_enable_privileges() )
 129                 return False;
 130
 131         if ( db == NULL )
 132                 return False;
 133
 134         if ( !sid || (sid->num_auths == 0) ) {
 135                 DEBUG(0,("set_privileges: Refusing to store empty SID!\n"));
 136                 return False;
 137         }
 138
 139         /* PRIV_<SID> (NULL terminated) as the key */
 140
 141         fstr_sprintf(keystr, "%s%s", PRIVPREFIX, sid_to_fstring(tmp, sid));
 142
 143         /* This writes the 64 bit bitmask out in little endian format */
 144         SBVAL(privbuf,0,mask);
 145
 146         data.dptr  = privbuf;
 147         data.dsize = sizeof(privbuf);
 148
 149         return NT_STATUS_IS_OK(dbwrap_store_bystring(db, keystr, data,
 150                                                      TDB_REPLACE));
 151 }
 152
 153 /*********************************************************************
 154  get a list of all privileges for all sids in the list
 155 *********************************************************************/
 156
 157 bool get_privileges_for_sids(uint64_t *privileges, struct dom_sid *slist, int scount)
 158 {
 159         uint64_t mask;
 160         int i;
 161         bool found = False;
 162
 163         *privileges = 0;
 164
 165         for ( i=0; i<scount; i++ ) {
 166                 /* don't add unless we actually have a privilege assigned */
 167
 168                 if ( !get_privileges( &slist[i], &mask ) )
 169                         continue;
 170
 171                 DEBUG(5,("get_privileges_for_sids: sid = %s\nPrivilege "
 172                          "set: 0x%llx\n", sid_string_dbg(&slist[i]),
 173                          (unsigned long long)mask));
 174
 175                 *privileges |= mask;
 176                 found = True;
 177         }
 178
 179         return found;
 180 }
 181
 182 NTSTATUS get_privileges_for_sid_as_set(TALLOC_CTX *mem_ctx, PRIVILEGE_SET **privileges, struct dom_sid *sid)
 183 {
 184         uint64_t mask;
 185         if (!get_privileges(sid, &mask)) {
 186                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 187         }
 188
 189         *privileges = talloc_zero(mem_ctx, PRIVILEGE_SET);
 190         if (!*privileges) {
 191                 return NT_STATUS_NO_MEMORY;
 192         }
 193
 194         if (!se_priv_to_privilege_set(*privileges, mask)) {
 195                 return NT_STATUS_NO_MEMORY;
 196         }
 197         return NT_STATUS_OK;
 198 }
 199
 200 /*********************************************************************
 201  traversal functions for privilege_enumerate_accounts
 202 *********************************************************************/
 203
 204 static int priv_traverse_fn(struct db_record *rec, void *state)
 205 {
 206         PRIV_SID_LIST *priv = (PRIV_SID_LIST *)state;
 207         int  prefixlen = strlen(PRIVPREFIX);
 208         struct dom_sid sid;
 209         fstring sid_string;
 210
 211         /* check we have a PRIV_+SID entry */
 212
 213         if ( strncmp((char *)rec->key.dptr, PRIVPREFIX, prefixlen) != 0)
 214                 return 0;
 215
 216         /* check to see if we are looking for a particular privilege */
 217
 218         fstrcpy( sid_string, (char *)&(rec->key.dptr[strlen(PRIVPREFIX)]) );
 219
 220         if (priv->privilege != 0) {
 221                 uint64_t mask;
 222
 223                 if (rec->value.dsize == 4*4) {
 224                         mask = map_old_SE_PRIV(rec->value.dptr);
 225                 } else {
 226                         if (rec->value.dsize != sizeof( uint64_t ) ) {
 227                                 DEBUG(3, ("get_privileges: Invalid privileges record assigned to SID "
 228                                           "[%s]\n", sid_string));
 229                                 return 0;
 230                         }
 231                         mask = BVAL(rec->value.dptr, 0);
 232                 }
 233
 234                 /* if the SID does not have the specified privilege
 235                    then just return */
 236
 237                 if ((mask & priv->privilege) == 0) {
 238                         return 0;
 239                 }
 240         }
 241
 242         /* this is a last ditch safety check to preventing returning
 243            and invalid SID (i've somehow run into this on development branches) */
 244
 245         if ( strcmp( "S-0-0", sid_string ) == 0 )
 246                 return 0;
 247
 248         if ( !string_to_sid(&sid, sid_string) ) {
 249                 DEBUG(0,("travsersal_fn_enum__acct: Could not convert SID [%s]\n",
 250                         sid_string));
 251                 return 0;
 252         }
 253
 254         if (!NT_STATUS_IS_OK(add_sid_to_array(priv->mem_ctx, &sid,
 255                                               &priv->sids.list,
 256                                               &priv->sids.count)))
 257         {
 258                 return 0;
 259         }
 260
 261         return 0;
 262 }
 263
 264 /*********************************************************************
 265  Retreive list of privileged SIDs (for _lsa_enumerate_accounts()
 266 *********************************************************************/
 267
 268 NTSTATUS privilege_enumerate_accounts(struct dom_sid **sids, int *num_sids)
 269 {
 270         struct db_context *db = get_account_pol_db();
 271         PRIV_SID_LIST priv;
 272
 273         if (db == NULL) {
 274                 return NT_STATUS_ACCESS_DENIED;
 275         }
 276
 277         ZERO_STRUCT(priv);
 278
 279         db->traverse_read(db, priv_traverse_fn, &priv);
 280
 281         /* give the memory away; caller will free */
 282
 283         *sids      = priv.sids.list;
 284         *num_sids  = priv.sids.count;
 285
 286         return NT_STATUS_OK;
 287 }
 288
 289 /*********************************************************************
 290  Retrieve list of SIDs granted a particular privilege
 291 *********************************************************************/
 292
 293 NTSTATUS privilege_enum_sids(enum sec_privilege privilege, TALLOC_CTX *mem_ctx,
 294                              struct dom_sid **sids, int *num_sids)
 295 {
 296         struct db_context *db = get_account_pol_db();
 297         PRIV_SID_LIST priv;
 298
 299         if (db == NULL) {
 300                 return NT_STATUS_ACCESS_DENIED;
 301         }
 302
 303         ZERO_STRUCT(priv);
 304
 305         priv.privilege = sec_privilege_mask(privilege);
 306         priv.mem_ctx = mem_ctx;
 307
 308         db->traverse_read(db, priv_traverse_fn, &priv);
 309
 310         /* give the memory away; caller will free */
 311
 312         *sids      = priv.sids.list;
 313         *num_sids  = priv.sids.count;
 314
 315         return NT_STATUS_OK;
 316 }
 317
 318 /***************************************************************************
 319  Add privilege to sid
 320 ****************************************************************************/
 321
 322 static bool grant_privilege_bitmap(const struct dom_sid *sid, const uint64_t priv_mask)
 323 {
 324         uint64_t old_mask, new_mask;
 325
 326         ZERO_STRUCT( old_mask );
 327         ZERO_STRUCT( new_mask );
 328
 329         if ( get_privileges( sid, &old_mask ) )
 330                 new_mask = old_mask;
 331         else
 332                 new_mask = 0;
 333
 334         new_mask |= priv_mask;
 335
 336         DEBUG(10,("grant_privilege: %s\n", sid_string_dbg(sid)));
 337
 338         DEBUGADD( 10, ("original privilege mask: 0x%llx\n", (unsigned long long)new_mask));
 339
 340         DEBUGADD( 10, ("new privilege mask:      0x%llx\n", (unsigned long long)new_mask));
 341
 342         return set_privileges( sid, new_mask );
 343 }
 344
 345 /*********************************************************************
 346  Add a privilege based on its name
 347 *********************************************************************/
 348
 349 bool grant_privilege_by_name(const struct dom_sid *sid, const char *name)
 350 {
 351         uint64_t mask;
 352
 353         if (! se_priv_from_name(name, &mask)) {
 354                 DEBUG(3, ("grant_privilege_by_name: "
 355                           "No Such Privilege Found (%s)\n", name));
 356                 return False;
 357         }
 358
 359         return grant_privilege_bitmap( sid, mask );
 360 }
 361
 362 /***************************************************************************
 363  Grant a privilege set (list of LUID values) from a sid
 364 ****************************************************************************/
 365
 366 bool grant_privilege_set(const struct dom_sid *sid, struct lsa_PrivilegeSet *set)
 367 {
 368         uint64_t privilege_mask;
 369         if (!privilege_set_to_se_priv(&privilege_mask, set)) {
 370                 return false;
 371         }
 372         return grant_privilege_bitmap(sid, privilege_mask);
 373 }
 374
 375 /***************************************************************************
 376  Remove privilege from sid
 377 ****************************************************************************/
 378
 379 static bool revoke_privilege_bitmap(const struct dom_sid *sid, const uint64_t priv_mask)
 380 {
 381         uint64_t mask;
 382
 383         /* if the user has no privileges, then we can't revoke any */
 384
 385         if ( !get_privileges( sid, &mask ) )
 386                 return True;
 387
 388         DEBUG(10,("revoke_privilege: %s\n", sid_string_dbg(sid)));
 389
 390         DEBUGADD( 10, ("original privilege mask: 0x%llx\n", (unsigned long long)mask));
 391
 392         mask &= ~priv_mask;
 393
 394         DEBUGADD( 10, ("new privilege mask:      0x%llx\n", (unsigned long long)mask));
 395
 396         return set_privileges( sid, mask );
 397 }
 398
 399 /***************************************************************************
 400  Remove a privilege set (list of LUID values) from a sid
 401 ****************************************************************************/
 402
 403 bool revoke_privilege_set(const struct dom_sid *sid, struct lsa_PrivilegeSet *set)
 404 {
 405         uint64_t privilege_mask;
 406         if (!privilege_set_to_se_priv(&privilege_mask, set)) {
 407                 return false;
 408         }
 409         return revoke_privilege_bitmap(sid, privilege_mask);
 410 }
 411
 412 /*********************************************************************
 413  Revoke all privileges
 414 *********************************************************************/
 415
 416 bool revoke_all_privileges( const struct dom_sid *sid )
 417 {
 418         return revoke_privilege_bitmap( sid, SE_ALL_PRIVS);
 419 }
 420
 421 /*********************************************************************
 422  Add a privilege based on its name
 423 *********************************************************************/
 424
 425 bool revoke_privilege_by_name(const struct dom_sid *sid, const char *name)
 426 {
 427         uint64_t mask;
 428
 429         if (! se_priv_from_name(name, &mask)) {
 430                 DEBUG(3, ("revoke_privilege_by_name: "
 431                           "No Such Privilege Found (%s)\n", name));
 432                 return False;
 433         }
 434
 435         return revoke_privilege_bitmap(sid, mask);
 436
 437 }
 438
 439 /***************************************************************************
 440  Retrieve the SIDs assigned to a given privilege
 441 ****************************************************************************/
 442
 443 NTSTATUS privilege_create_account(const struct dom_sid *sid )
 444 {
 445         return ( grant_privilege_bitmap(sid, 0) ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL);
 446 }
 447
 448 /***************************************************************************
 449  Delete a privileged account
 450 ****************************************************************************/
 451
 452 NTSTATUS privilege_delete_account(const struct dom_sid *sid)
 453 {
 454         struct db_context *db = get_account_pol_db();
 455         fstring tmp, keystr;
 456
 457         if (!lp_enable_privileges()) {
 458                 return NT_STATUS_OK;
 459         }
 460
 461         if (!db) {
 462                 return NT_STATUS_INVALID_HANDLE;
 463         }
 464
 465         if (!sid || (sid->num_auths == 0)) {
 466                 return NT_STATUS_INVALID_SID;
 467         }
 468
 469         /* PRIV_<SID> (NULL terminated) as the key */
 470
 471         fstr_sprintf(keystr, "%s%s", PRIVPREFIX, sid_to_fstring(tmp, sid));
 472
 473         return dbwrap_delete_bystring(db, keystr);
 474 }
 475
 476 /*******************************************************************
 477 *******************************************************************/
 478
 479 bool is_privileged_sid( const struct dom_sid *sid )
 480 {
 481         uint64_t mask;
 482
 483         return get_privileges( sid, &mask );
 484 }
 485
 486 /*******************************************************************
 487 *******************************************************************/
 488
 489 bool grant_all_privileges( const struct dom_sid *sid )
 490 {
 491         uint64_t mask;
 492
 493         se_priv_put_all_privileges(&mask);
 494
 495         return grant_privilege_bitmap( sid, mask );
 496 }