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         struct dom_sid_buf tmp;
  78         fstring keystr;
  79         TDB_DATA data;
  80         NTSTATUS status;
  81
  82         /* Fail if the admin has not enable privileges */
  83
  84         if ( !lp_enable_privileges() ) {
  85                 return False;
  86         }
  87
  88         if ( db == NULL )
  89                 return False;
  90
  91         /* PRIV_<SID> (NULL terminated) as the key */
  92
  93         fstr_sprintf(keystr, "%s%s", PRIVPREFIX, dom_sid_str_buf(sid, &tmp));
  94
  95         status = dbwrap_fetch_bystring(db, talloc_tos(), keystr, &data);
  96
  97         if (!NT_STATUS_IS_OK(status)) {
  98                 DEBUG(4, ("get_privileges: No privileges assigned to SID "
  99                           "[%s]\n", tmp.buf));
 100                 return False;
 101         }
 102
 103         if (data.dsize == 4*4) {
 104                 /* it's an old style SE_PRIV structure. */
 105                 *mask = map_old_SE_PRIV(data.dptr);
 106         } else {
 107                 if (data.dsize != sizeof( uint64_t ) ) {
 108                         DEBUG(3, ("get_privileges: Invalid privileges record assigned to SID "
 109                                   "[%s]\n", tmp.buf));
 110                         return False;
 111                 }
 112
 113                 *mask = BVAL(data.dptr, 0);
 114         }
 115
 116         TALLOC_FREE(data.dptr);
 117
 118         return True;
 119 }
 120
 121 /***************************************************************************
 122  Store the privilege mask (set) for a given SID
 123 ****************************************************************************/
 124
 125 static bool set_privileges( const struct dom_sid *sid, uint64_t mask )
 126 {
 127         struct db_context *db = get_account_pol_db();
 128         uint8_t privbuf[8];
 129         struct dom_sid_buf tmp;
 130         fstring keystr;
 131         TDB_DATA data;
 132
 133         if ( !lp_enable_privileges() )
 134                 return False;
 135
 136         if ( db == NULL )
 137                 return False;
 138
 139         if ( !sid || (sid->num_auths == 0) ) {
 140                 DEBUG(0,("set_privileges: Refusing to store empty SID!\n"));
 141                 return False;
 142         }
 143
 144         /* PRIV_<SID> (NULL terminated) as the key */
 145
 146         fstr_sprintf(keystr, "%s%s", PRIVPREFIX, dom_sid_str_buf(sid, &tmp));
 147
 148         /* This writes the 64 bit bitmask out in little endian format */
 149         SBVAL(privbuf,0,mask);
 150
 151         data.dptr  = privbuf;
 152         data.dsize = sizeof(privbuf);
 153
 154         return NT_STATUS_IS_OK(dbwrap_store_bystring(db, keystr, data,
 155                                                      TDB_REPLACE));
 156 }
 157
 158 /*********************************************************************
 159  get a list of all privileges for all sids in the list
 160 *********************************************************************/
 161
 162 bool get_privileges_for_sids(uint64_t *privileges, struct dom_sid *slist, int scount)
 163 {
 164         uint64_t mask;
 165         int i;
 166         bool found = False;
 167
 168         *privileges = 0;
 169
 170         for ( i=0; i<scount; i++ ) {
 171                 struct dom_sid_buf buf;
 172
 173                 /* don't add unless we actually have a privilege assigned */
 174
 175                 if ( !get_privileges( &slist[i], &mask ) )
 176                         continue;
 177
 178                 DEBUG(5,("get_privileges_for_sids: sid = %s\nPrivilege "
 179                          "set: 0x%llx\n",
 180                          dom_sid_str_buf(&slist[i], &buf),
 181                          (unsigned long long)mask));
 182
 183                 *privileges |= mask;
 184                 found = True;
 185         }
 186
 187         return found;
 188 }
 189
 190 NTSTATUS get_privileges_for_sid_as_set(TALLOC_CTX *mem_ctx, PRIVILEGE_SET **privileges, struct dom_sid *sid)
 191 {
 192         uint64_t mask;
 193         if (!get_privileges(sid, &mask)) {
 194                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 195         }
 196
 197         *privileges = talloc_zero(mem_ctx, PRIVILEGE_SET);
 198         if (!*privileges) {
 199                 return NT_STATUS_NO_MEMORY;
 200         }
 201
 202         if (!se_priv_to_privilege_set(*privileges, mask)) {
 203                 return NT_STATUS_NO_MEMORY;
 204         }
 205         return NT_STATUS_OK;
 206 }
 207
 208 /*********************************************************************
 209  traversal functions for privilege_enumerate_accounts
 210 *********************************************************************/
 211
 212 static int priv_traverse_fn(struct db_record *rec, void *state)
 213 {
 214         PRIV_SID_LIST *priv = (PRIV_SID_LIST *)state;
 215         int  prefixlen = strlen(PRIVPREFIX);
 216         struct dom_sid sid;
 217         fstring sid_string;
 218         TDB_DATA key;
 219
 220         key = dbwrap_record_get_key(rec);
 221
 222         /* check we have a PRIV_+SID entry */
 223
 224         if (strncmp((char *)key.dptr, PRIVPREFIX, prefixlen) != 0)
 225                 return 0;
 226
 227         /* check to see if we are looking for a particular privilege */
 228
 229         fstrcpy( sid_string, (char *)&(key.dptr[strlen(PRIVPREFIX)]) );
 230
 231         if (priv->privilege != 0) {
 232                 uint64_t mask;
 233                 TDB_DATA value;
 234
 235                 value = dbwrap_record_get_value(rec);
 236
 237                 if (value.dsize == 4*4) {
 238                         mask = map_old_SE_PRIV(value.dptr);
 239                 } else {
 240                         if (value.dsize != sizeof( uint64_t ) ) {
 241                                 DEBUG(3, ("get_privileges: Invalid privileges record assigned to SID "
 242                                           "[%s]\n", sid_string));
 243                                 return 0;
 244                         }
 245                         mask = BVAL(value.dptr, 0);
 246                 }
 247
 248                 /* if the SID does not have the specified privilege
 249                    then just return */
 250
 251                 if ((mask & priv->privilege) == 0) {
 252                         return 0;
 253                 }
 254         }
 255
 256         /* this is a last ditch safety check to preventing returning
 257            and invalid SID (i've somehow run into this on development branches) */
 258
 259         if ( strcmp( "S-0-0", sid_string ) == 0 )
 260                 return 0;
 261
 262         if ( !string_to_sid(&sid, sid_string) ) {
 263                 DEBUG(0,("travsersal_fn_enum__acct: Could not convert SID [%s]\n",
 264                         sid_string));
 265                 return 0;
 266         }
 267
 268         if (!NT_STATUS_IS_OK(add_sid_to_array(priv->mem_ctx, &sid,
 269                                               &priv->sids.list,
 270                                               &priv->sids.count)))
 271         {
 272                 return 0;
 273         }
 274
 275         return 0;
 276 }
 277
 278 /*********************************************************************
 279  Retrieve list of privileged SIDs (for _lsa_enumerate_accounts()
 280 *********************************************************************/
 281
 282 NTSTATUS privilege_enumerate_accounts(struct dom_sid **sids, int *num_sids)
 283 {
 284         struct db_context *db = get_account_pol_db();
 285         PRIV_SID_LIST priv;
 286         NTSTATUS status;
 287
 288         if (db == NULL) {
 289                 return NT_STATUS_ACCESS_DENIED;
 290         }
 291
 292         ZERO_STRUCT(priv);
 293
 294         status = dbwrap_traverse_read(db, priv_traverse_fn, &priv, NULL);
 295         if (!NT_STATUS_IS_OK(status)) {
 296                 return status;
 297         }
 298
 299         /* give the memory away; caller will free */
 300
 301         *sids      = priv.sids.list;
 302         *num_sids  = priv.sids.count;
 303
 304         return NT_STATUS_OK;
 305 }
 306
 307 /*********************************************************************
 308  Retrieve list of SIDs granted a particular privilege
 309 *********************************************************************/
 310
 311 NTSTATUS privilege_enum_sids(enum sec_privilege privilege, TALLOC_CTX *mem_ctx,
 312                              struct dom_sid **sids, int *num_sids)
 313 {
 314         struct db_context *db = get_account_pol_db();
 315         PRIV_SID_LIST priv;
 316         NTSTATUS status;
 317
 318         if (db == NULL) {
 319                 return NT_STATUS_ACCESS_DENIED;
 320         }
 321
 322         ZERO_STRUCT(priv);
 323
 324         priv.privilege = sec_privilege_mask(privilege);
 325         priv.mem_ctx = mem_ctx;
 326
 327         status = dbwrap_traverse_read(db, priv_traverse_fn, &priv, NULL);
 328         if (!NT_STATUS_IS_OK(status)) {
 329                 return status;
 330         }
 331
 332         /* give the memory away; caller will free */
 333
 334         *sids      = priv.sids.list;
 335         *num_sids  = priv.sids.count;
 336
 337         return NT_STATUS_OK;
 338 }
 339
 340 /***************************************************************************
 341  Add privilege to sid
 342 ****************************************************************************/
 343
 344 static bool grant_privilege_bitmap(const struct dom_sid *sid, const uint64_t priv_mask)
 345 {
 346         uint64_t old_mask, new_mask;
 347         struct dom_sid_buf buf;
 348
 349         ZERO_STRUCT( old_mask );
 350         ZERO_STRUCT( new_mask );
 351
 352         if ( get_privileges( sid, &old_mask ) )
 353                 new_mask = old_mask;
 354         else
 355                 new_mask = 0;
 356
 357         new_mask |= priv_mask;
 358
 359         DEBUG(10,("grant_privilege: %s\n", dom_sid_str_buf(sid, &buf)));
 360
 361         DEBUGADD( 10, ("original privilege mask: 0x%llx\n", (unsigned long long)new_mask));
 362
 363         DEBUGADD( 10, ("new privilege mask:      0x%llx\n", (unsigned long long)new_mask));
 364
 365         return set_privileges( sid, new_mask );
 366 }
 367
 368 /*********************************************************************
 369  Add a privilege based on its name
 370 *********************************************************************/
 371
 372 bool grant_privilege_by_name(const struct dom_sid *sid, const char *name)
 373 {
 374         uint64_t mask;
 375
 376         if (! se_priv_from_name(name, &mask)) {
 377                 DEBUG(3, ("grant_privilege_by_name: "
 378                           "No Such Privilege Found (%s)\n", name));
 379                 return False;
 380         }
 381
 382         return grant_privilege_bitmap( sid, mask );
 383 }
 384
 385 /***************************************************************************
 386  Grant a privilege set (list of LUID values) from a sid
 387 ****************************************************************************/
 388
 389 bool grant_privilege_set(const struct dom_sid *sid, struct lsa_PrivilegeSet *set)
 390 {
 391         uint64_t privilege_mask;
 392         if (!privilege_set_to_se_priv(&privilege_mask, set)) {
 393                 return false;
 394         }
 395         return grant_privilege_bitmap(sid, privilege_mask);
 396 }
 397
 398 /***************************************************************************
 399  Remove privilege from sid
 400 ****************************************************************************/
 401
 402 static bool revoke_privilege_bitmap(const struct dom_sid *sid, const uint64_t priv_mask)
 403 {
 404         uint64_t mask;
 405         struct dom_sid_buf buf;
 406
 407         /* if the user has no privileges, then we can't revoke any */
 408
 409         if ( !get_privileges( sid, &mask ) )
 410                 return True;
 411
 412         DEBUG(10,("revoke_privilege: %s\n", dom_sid_str_buf(sid, &buf)));
 413
 414         DEBUGADD( 10, ("original privilege mask: 0x%llx\n", (unsigned long long)mask));
 415
 416         mask &= ~priv_mask;
 417
 418         DEBUGADD( 10, ("new privilege mask:      0x%llx\n", (unsigned long long)mask));
 419
 420         return set_privileges( sid, mask );
 421 }
 422
 423 /***************************************************************************
 424  Remove a privilege set (list of LUID values) from a sid
 425 ****************************************************************************/
 426
 427 bool revoke_privilege_set(const struct dom_sid *sid, struct lsa_PrivilegeSet *set)
 428 {
 429         uint64_t privilege_mask;
 430         if (!privilege_set_to_se_priv(&privilege_mask, set)) {
 431                 return false;
 432         }
 433         return revoke_privilege_bitmap(sid, privilege_mask);
 434 }
 435
 436 /*********************************************************************
 437  Revoke all privileges
 438 *********************************************************************/
 439
 440 bool revoke_all_privileges( const struct dom_sid *sid )
 441 {
 442         return revoke_privilege_bitmap( sid, SE_ALL_PRIVS);
 443 }
 444
 445 /*********************************************************************
 446  Add a privilege based on its name
 447 *********************************************************************/
 448
 449 bool revoke_privilege_by_name(const struct dom_sid *sid, const char *name)
 450 {
 451         uint64_t mask;
 452
 453         if (! se_priv_from_name(name, &mask)) {
 454                 DEBUG(3, ("revoke_privilege_by_name: "
 455                           "No Such Privilege Found (%s)\n", name));
 456                 return False;
 457         }
 458
 459         return revoke_privilege_bitmap(sid, mask);
 460
 461 }
 462
 463 /***************************************************************************
 464  Retrieve the SIDs assigned to a given privilege
 465 ****************************************************************************/
 466
 467 NTSTATUS privilege_create_account(const struct dom_sid *sid )
 468 {
 469         return ( grant_privilege_bitmap(sid, 0) ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL);
 470 }
 471
 472 /***************************************************************************
 473  Delete a privileged account
 474 ****************************************************************************/
 475
 476 NTSTATUS privilege_delete_account(const struct dom_sid *sid)
 477 {
 478         struct db_context *db = get_account_pol_db();
 479         struct dom_sid_buf tmp;
 480         fstring keystr;
 481
 482         if (!lp_enable_privileges()) {
 483                 return NT_STATUS_OK;
 484         }
 485
 486         if (!db) {
 487                 return NT_STATUS_INVALID_HANDLE;
 488         }
 489
 490         if (!sid || (sid->num_auths == 0)) {
 491                 return NT_STATUS_INVALID_SID;
 492         }
 493
 494         /* PRIV_<SID> (NULL terminated) as the key */
 495
 496         fstr_sprintf(keystr, "%s%s", PRIVPREFIX, dom_sid_str_buf(sid, &tmp));
 497
 498         return dbwrap_delete_bystring(db, keystr);
 499 }
 500
 501 /*******************************************************************
 502 *******************************************************************/
 503
 504 bool is_privileged_sid( const struct dom_sid *sid )
 505 {
 506         uint64_t mask;
 507
 508         return get_privileges( sid, &mask );
 509 }
 510
 511 /*******************************************************************
 512 *******************************************************************/
 513
 514 bool grant_all_privileges( const struct dom_sid *sid )
 515 {
 516         uint64_t mask;
 517
 518         se_priv_put_all_privileges(&mask);
 519
 520         return grant_privilege_bitmap( sid, mask );
 521 }