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 "lib/privileges.h"
  26 #include "dbwrap/dbwrap.h"
  27 #include "libcli/security/privileges_private.h"
  28 #include "../libcli/security/security.h"
  29 #include "passdb.h"
  30
  31 #define PRIVPREFIX              "PRIV_"
  32
  33 typedef struct {
  34         uint32_t count;
  35         struct dom_sid *list;
  36 } SID_LIST;
  37
  38 typedef struct {
  39         TALLOC_CTX *mem_ctx;
  40         uint64_t privilege;
  41         SID_LIST sids;
  42 } PRIV_SID_LIST;
  43
  44 /*
  45   interpret an old style SE_PRIV structure
  46  */
  47 static uint64_t map_old_SE_PRIV(unsigned char *dptr)
  48 {
  49         uint32_t *old_masks = (uint32_t *)dptr;
  50         /*
  51          * the old privileges code only ever used up to 0x800, except
  52          * for a special case of 'SE_ALL_PRIVS' which was 0xFFFFFFFF
  53          */
  54         if (old_masks[0] == 0xFFFFFFFF) {
  55                 /* they set all privileges */
  56                 return SE_ALL_PRIVS;
  57         }
  58
  59         /* the old code used the machine byte order, but we don't know
  60          * the byte order of the machine that wrote it. However we can
  61          * tell what byte order it was by taking advantage of the fact
  62          * that it only ever use up to 0x800
  63          */
  64         if (dptr[0] || dptr[1]) {
  65                 /* it was little endian */
  66                 return IVAL(dptr, 0);
  67         }
  68
  69         /* it was either zero or big-endian */
  70         return RIVAL(dptr, 0);
  71 }
  72
  73
  74 static bool get_privileges( const struct dom_sid *sid, uint64_t *mask )
  75 {
  76         struct db_context *db = get_account_pol_db();
  77         fstring tmp, keystr;
  78         TDB_DATA data;
  79         NTSTATUS status;
  80
  81         /* Fail if the admin has not enable privileges */
  82
  83         if ( !lp_enable_privileges() ) {
  84                 return False;
  85         }
  86
  87         if ( db == NULL )
  88                 return False;
  89
  90         /* PRIV_<SID> (NULL terminated) as the key */
  91
  92         fstr_sprintf(keystr, "%s%s", PRIVPREFIX, sid_to_fstring(tmp, sid));
  93
  94         status = dbwrap_fetch_bystring(db, talloc_tos(), keystr, &data);
  95
  96         if (!NT_STATUS_IS_OK(status)) {
  97                 DEBUG(4, ("get_privileges: No privileges assigned to SID "
  98                           "[%s]\n", sid_string_dbg(sid)));
  99                 return False;
 100         }
 101
 102         if (data.dsize == 4*4) {
 103                 /* it's an old style SE_PRIV structure. */
 104                 *mask = map_old_SE_PRIV(data.dptr);
 105         } else {
 106                 if (data.dsize != sizeof( uint64_t ) ) {
 107                         DEBUG(3, ("get_privileges: Invalid privileges record assigned to SID "
 108                                   "[%s]\n", sid_string_dbg(sid)));
 109                         return False;
 110                 }
 111
 112                 *mask = BVAL(data.dptr, 0);
 113         }
 114
 115         TALLOC_FREE(data.dptr);
 116
 117         return True;
 118 }
 119
 120 /***************************************************************************
 121  Store the privilege mask (set) for a given SID
 122 ****************************************************************************/
 123
 124 static bool set_privileges( const struct dom_sid *sid, uint64_t mask )
 125 {
 126         struct db_context *db = get_account_pol_db();
 127         uint8_t privbuf[8];
 128         fstring tmp, keystr;
 129         TDB_DATA data;
 130
 131         if ( !lp_enable_privileges() )
 132                 return False;
 133
 134         if ( db == NULL )
 135                 return False;
 136
 137         if ( !sid || (sid->num_auths == 0) ) {
 138                 DEBUG(0,("set_privileges: Refusing to store empty SID!\n"));
 139                 return False;
 140         }
 141
 142         /* PRIV_<SID> (NULL terminated) as the key */
 143
 144         fstr_sprintf(keystr, "%s%s", PRIVPREFIX, sid_to_fstring(tmp, sid));
 145
 146         /* This writes the 64 bit bitmask out in little endian format */
 147         SBVAL(privbuf,0,mask);
 148
 149         data.dptr  = privbuf;
 150         data.dsize = sizeof(privbuf);
 151
 152         return NT_STATUS_IS_OK(dbwrap_store_bystring(db, keystr, data,
 153                                                      TDB_REPLACE));
 154 }
 155
 156 /*********************************************************************
 157  get a list of all privileges for all sids in the list
 158 *********************************************************************/
 159
 160 bool get_privileges_for_sids(uint64_t *privileges, struct dom_sid *slist, int scount)
 161 {
 162         uint64_t mask;
 163         int i;
 164         bool found = False;
 165
 166         *privileges = 0;
 167
 168         for ( i=0; i<scount; i++ ) {
 169                 /* don't add unless we actually have a privilege assigned */
 170
 171                 if ( !get_privileges( &slist[i], &mask ) )
 172                         continue;
 173
 174                 DEBUG(5,("get_privileges_for_sids: sid = %s\nPrivilege "
 175                          "set: 0x%llx\n", sid_string_dbg(&slist[i]),
 176                          (unsigned long long)mask));
 177
 178                 *privileges |= mask;
 179                 found = True;
 180         }
 181
 182         return found;
 183 }
 184
 185 NTSTATUS get_privileges_for_sid_as_set(TALLOC_CTX *mem_ctx, PRIVILEGE_SET **privileges, struct dom_sid *sid)
 186 {
 187         uint64_t mask;
 188         if (!get_privileges(sid, &mask)) {
 189                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 190         }
 191
 192         *privileges = talloc_zero(mem_ctx, PRIVILEGE_SET);
 193         if (!*privileges) {
 194                 return NT_STATUS_NO_MEMORY;
 195         }
 196
 197         if (!se_priv_to_privilege_set(*privileges, mask)) {
 198                 return NT_STATUS_NO_MEMORY;
 199         }
 200         return NT_STATUS_OK;
 201 }
 202
 203 /*********************************************************************
 204  traversal functions for privilege_enumerate_accounts
 205 *********************************************************************/
 206
 207 static int priv_traverse_fn(struct db_record *rec, void *state)
 208 {
 209         PRIV_SID_LIST *priv = (PRIV_SID_LIST *)state;
 210         int  prefixlen = strlen(PRIVPREFIX);
 211         struct dom_sid sid;
 212         fstring sid_string;
 213         TDB_DATA key;
 214
 215         key = dbwrap_record_get_key(rec);
 216
 217         /* check we have a PRIV_+SID entry */
 218
 219         if (strncmp((char *)key.dptr, PRIVPREFIX, prefixlen) != 0)
 220                 return 0;
 221
 222         /* check to see if we are looking for a particular privilege */
 223
 224         fstrcpy( sid_string, (char *)&(key.dptr[strlen(PRIVPREFIX)]) );
 225
 226         if (priv->privilege != 0) {
 227                 uint64_t mask;
 228                 TDB_DATA value;
 229
 230                 value = dbwrap_record_get_value(rec);
 231
 232                 if (value.dsize == 4*4) {
 233                         mask = map_old_SE_PRIV(value.dptr);
 234                 } else {
 235                         if (value.dsize != sizeof( uint64_t ) ) {
 236                                 DEBUG(3, ("get_privileges: Invalid privileges record assigned to SID "
 237                                           "[%s]\n", sid_string));
 238                                 return 0;
 239                         }
 240                         mask = BVAL(value.dptr, 0);
 241                 }
 242
 243                 /* if the SID does not have the specified privilege
 244                    then just return */
 245
 246                 if ((mask & priv->privilege) == 0) {
 247                         return 0;
 248                 }
 249         }
 250
 251         /* this is a last ditch safety check to preventing returning
 252            and invalid SID (i've somehow run into this on development branches) */
 253
 254         if ( strcmp( "S-0-0", sid_string ) == 0 )
 255                 return 0;
 256
 257         if ( !string_to_sid(&sid, sid_string) ) {
 258                 DEBUG(0,("travsersal_fn_enum__acct: Could not convert SID [%s]\n",
 259                         sid_string));
 260                 return 0;
 261         }
 262
 263         if (!NT_STATUS_IS_OK(add_sid_to_array(priv->mem_ctx, &sid,
 264                                               &priv->sids.list,
 265                                               &priv->sids.count)))
 266         {
 267                 return 0;
 268         }
 269
 270         return 0;
 271 }
 272
 273 /*********************************************************************
 274  Retrieve list of privileged SIDs (for _lsa_enumerate_accounts()
 275 *********************************************************************/
 276
 277 NTSTATUS privilege_enumerate_accounts(struct dom_sid **sids, int *num_sids)
 278 {
 279         struct db_context *db = get_account_pol_db();
 280         PRIV_SID_LIST priv;
 281         NTSTATUS status;
 282
 283         if (db == NULL) {
 284                 return NT_STATUS_ACCESS_DENIED;
 285         }
 286
 287         ZERO_STRUCT(priv);
 288
 289         status = dbwrap_traverse_read(db, priv_traverse_fn, &priv, NULL);
 290         if (!NT_STATUS_IS_OK(status)) {
 291                 return status;
 292         }
 293
 294         /* give the memory away; caller will free */
 295
 296         *sids      = priv.sids.list;
 297         *num_sids  = priv.sids.count;
 298
 299         return NT_STATUS_OK;
 300 }
 301
 302 /*********************************************************************
 303  Retrieve list of SIDs granted a particular privilege
 304 *********************************************************************/
 305
 306 NTSTATUS privilege_enum_sids(enum sec_privilege privilege, TALLOC_CTX *mem_ctx,
 307                              struct dom_sid **sids, int *num_sids)
 308 {
 309         struct db_context *db = get_account_pol_db();
 310         PRIV_SID_LIST priv;
 311         NTSTATUS status;
 312
 313         if (db == NULL) {
 314                 return NT_STATUS_ACCESS_DENIED;
 315         }
 316
 317         ZERO_STRUCT(priv);
 318
 319         priv.privilege = sec_privilege_mask(privilege);
 320         priv.mem_ctx = mem_ctx;
 321
 322         status = dbwrap_traverse_read(db, priv_traverse_fn, &priv, NULL);
 323         if (!NT_STATUS_IS_OK(status)) {
 324                 return status;
 325         }
 326
 327         /* give the memory away; caller will free */
 328
 329         *sids      = priv.sids.list;
 330         *num_sids  = priv.sids.count;
 331
 332         return NT_STATUS_OK;
 333 }
 334
 335 /***************************************************************************
 336  Add privilege to sid
 337 ****************************************************************************/
 338
 339 static bool grant_privilege_bitmap(const struct dom_sid *sid, const uint64_t priv_mask)
 340 {
 341         uint64_t old_mask, new_mask;
 342
 343         ZERO_STRUCT( old_mask );
 344         ZERO_STRUCT( new_mask );
 345
 346         if ( get_privileges( sid, &old_mask ) )
 347                 new_mask = old_mask;
 348         else
 349                 new_mask = 0;
 350
 351         new_mask |= priv_mask;
 352
 353         DEBUG(10,("grant_privilege: %s\n", sid_string_dbg(sid)));
 354
 355         DEBUGADD( 10, ("original privilege mask: 0x%llx\n", (unsigned long long)new_mask));
 356
 357         DEBUGADD( 10, ("new privilege mask:      0x%llx\n", (unsigned long long)new_mask));
 358
 359         return set_privileges( sid, new_mask );
 360 }
 361
 362 /*********************************************************************
 363  Add a privilege based on its name
 364 *********************************************************************/
 365
 366 bool grant_privilege_by_name(const struct dom_sid *sid, const char *name)
 367 {
 368         uint64_t mask;
 369
 370         if (! se_priv_from_name(name, &mask)) {
 371                 DEBUG(3, ("grant_privilege_by_name: "
 372                           "No Such Privilege Found (%s)\n", name));
 373                 return False;
 374         }
 375
 376         return grant_privilege_bitmap( sid, mask );
 377 }
 378
 379 /***************************************************************************
 380  Grant a privilege set (list of LUID values) from a sid
 381 ****************************************************************************/
 382
 383 bool grant_privilege_set(const struct dom_sid *sid, struct lsa_PrivilegeSet *set)
 384 {
 385         uint64_t privilege_mask;
 386         if (!privilege_set_to_se_priv(&privilege_mask, set)) {
 387                 return false;
 388         }
 389         return grant_privilege_bitmap(sid, privilege_mask);
 390 }
 391
 392 /***************************************************************************
 393  Remove privilege from sid
 394 ****************************************************************************/
 395
 396 static bool revoke_privilege_bitmap(const struct dom_sid *sid, const uint64_t priv_mask)
 397 {
 398         uint64_t mask;
 399
 400         /* if the user has no privileges, then we can't revoke any */
 401
 402         if ( !get_privileges( sid, &mask ) )
 403                 return True;
 404
 405         DEBUG(10,("revoke_privilege: %s\n", sid_string_dbg(sid)));
 406
 407         DEBUGADD( 10, ("original privilege mask: 0x%llx\n", (unsigned long long)mask));
 408
 409         mask &= ~priv_mask;
 410
 411         DEBUGADD( 10, ("new privilege mask:      0x%llx\n", (unsigned long long)mask));
 412
 413         return set_privileges( sid, mask );
 414 }
 415
 416 /***************************************************************************
 417  Remove a privilege set (list of LUID values) from a sid
 418 ****************************************************************************/
 419
 420 bool revoke_privilege_set(const struct dom_sid *sid, struct lsa_PrivilegeSet *set)
 421 {
 422         uint64_t privilege_mask;
 423         if (!privilege_set_to_se_priv(&privilege_mask, set)) {
 424                 return false;
 425         }
 426         return revoke_privilege_bitmap(sid, privilege_mask);
 427 }
 428
 429 /*********************************************************************
 430  Revoke all privileges
 431 *********************************************************************/
 432
 433 bool revoke_all_privileges( const struct dom_sid *sid )
 434 {
 435         return revoke_privilege_bitmap( sid, SE_ALL_PRIVS);
 436 }
 437
 438 /*********************************************************************
 439  Add a privilege based on its name
 440 *********************************************************************/
 441
 442 bool revoke_privilege_by_name(const struct dom_sid *sid, const char *name)
 443 {
 444         uint64_t mask;
 445
 446         if (! se_priv_from_name(name, &mask)) {
 447                 DEBUG(3, ("revoke_privilege_by_name: "
 448                           "No Such Privilege Found (%s)\n", name));
 449                 return False;
 450         }
 451
 452         return revoke_privilege_bitmap(sid, mask);
 453
 454 }
 455
 456 /***************************************************************************
 457  Retrieve the SIDs assigned to a given privilege
 458 ****************************************************************************/
 459
 460 NTSTATUS privilege_create_account(const struct dom_sid *sid )
 461 {
 462         return ( grant_privilege_bitmap(sid, 0) ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL);
 463 }
 464
 465 /***************************************************************************
 466  Delete a privileged account
 467 ****************************************************************************/
 468
 469 NTSTATUS privilege_delete_account(const struct dom_sid *sid)
 470 {
 471         struct db_context *db = get_account_pol_db();
 472         fstring tmp, keystr;
 473
 474         if (!lp_enable_privileges()) {
 475                 return NT_STATUS_OK;
 476         }
 477
 478         if (!db) {
 479                 return NT_STATUS_INVALID_HANDLE;
 480         }
 481
 482         if (!sid || (sid->num_auths == 0)) {
 483                 return NT_STATUS_INVALID_SID;
 484         }
 485
 486         /* PRIV_<SID> (NULL terminated) as the key */
 487
 488         fstr_sprintf(keystr, "%s%s", PRIVPREFIX, sid_to_fstring(tmp, sid));
 489
 490         return dbwrap_delete_bystring(db, keystr);
 491 }
 492
 493 /*******************************************************************
 494 *******************************************************************/
 495
 496 bool is_privileged_sid( const struct dom_sid *sid )
 497 {
 498         uint64_t mask;
 499
 500         return get_privileges( sid, &mask );
 501 }
 502
 503 /*******************************************************************
 504 *******************************************************************/
 505
 506 bool grant_all_privileges( const struct dom_sid *sid )
 507 {
 508         uint64_t mask;
 509
 510         se_priv_put_all_privileges(&mask);
 511
 512         return grant_privilege_bitmap( sid, mask );
 513 }