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