source/groupdb/mapping_tdb.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  RPC Pipe client / server routines
   4  *  Copyright (C) Andrew Tridgell              1992-2006,
   5  *  Copyright (C) Jean François Micouleau      1998-2001.
   6  *  Copyright (C) Volker Lendecke              2006.
   7  *  Copyright (C) Gerald Carter                2006.
   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 #include "includes.h"
  25 #include "groupdb/mapping.h"
  26
  27 static TDB_CONTEXT *tdb; /* used for driver files */
  28
  29 /****************************************************************************
  30  Open the group mapping tdb.
  31 ****************************************************************************/
  32  BOOL init_group_mapping(void)
  33 {
  34         const char *vstring = "INFO/version";
  35         int32 vers_id;
  36         GROUP_MAP *map_table = NULL;
  37         size_t num_entries = 0;
  38
  39         if (tdb)
  40                 return True;
  41
  42         tdb = tdb_open_log(lock_path("group_mapping.tdb"), 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
  43         if (!tdb) {
  44                 DEBUG(0,("Failed to open group mapping database\n"));
  45                 return False;
  46         }
  47
  48         /* handle a Samba upgrade */
  49         tdb_lock_bystring(tdb, vstring);
  50
  51         /* Cope with byte-reversed older versions of the db. */
  52         vers_id = tdb_fetch_int32(tdb, vstring);
  53         if ((vers_id == DATABASE_VERSION_V1) || (IREV(vers_id) == DATABASE_VERSION_V1)) {
  54                 /* Written on a bigendian machine with old fetch_int code. Save as le. */
  55                 tdb_store_int32(tdb, vstring, DATABASE_VERSION_V2);
  56                 vers_id = DATABASE_VERSION_V2;
  57         }
  58
  59         /* if its an unknown version we remove everthing in the db */
  60
  61         if (vers_id != DATABASE_VERSION_V2) {
  62                 tdb_traverse(tdb, tdb_traverse_delete_fn, NULL);
  63                 tdb_store_int32(tdb, vstring, DATABASE_VERSION_V2);
  64         }
  65
  66         tdb_unlock_bystring(tdb, vstring);
  67
  68         /* cleanup any map entries with a gid == -1 */
  69
  70         if ( enum_group_mapping( NULL, SID_NAME_UNKNOWN, &map_table, &num_entries, False ) ) {
  71                 int i;
  72
  73                 for ( i=0; i<num_entries; i++ ) {
  74                         if ( map_table[i].gid == -1 ) {
  75                                 group_map_remove( &map_table[i].sid );
  76                         }
  77                 }
  78
  79                 SAFE_FREE( map_table );
  80         }
  81
  82
  83         return True;
  84 }
  85
  86 /****************************************************************************
  87 ****************************************************************************/
  88  BOOL add_mapping_entry(GROUP_MAP *map, int flag)
  89 {
  90         TDB_DATA kbuf, dbuf;
  91         pstring key, buf;
  92         fstring string_sid="";
  93         int len;
  94
  95         if(!init_group_mapping()) {
  96                 DEBUG(0,("failed to initialize group mapping\n"));
  97                 return(False);
  98         }
  99
 100         sid_to_string(string_sid, &map->sid);
 101
 102         len = tdb_pack(buf, sizeof(buf), "ddff",
 103                         map->gid, map->sid_name_use, map->nt_name, map->comment);
 104
 105         if (len > sizeof(buf))
 106                 return False;
 107
 108         slprintf(key, sizeof(key), "%s%s", GROUP_PREFIX, string_sid);
 109
 110         kbuf.dsize = strlen(key)+1;
 111         kbuf.dptr = key;
 112         dbuf.dsize = len;
 113         dbuf.dptr = buf;
 114         if (tdb_store(tdb, kbuf, dbuf, flag) != 0) return False;
 115
 116         return True;
 117 }
 118
 119
 120 /****************************************************************************
 121  Return the sid and the type of the unix group.
 122 ****************************************************************************/
 123
 124  BOOL get_group_map_from_sid(DOM_SID sid, GROUP_MAP *map)
 125 {
 126         TDB_DATA kbuf, dbuf;
 127         pstring key;
 128         fstring string_sid;
 129         int ret = 0;
 130
 131         if(!init_group_mapping()) {
 132                 DEBUG(0,("failed to initialize group mapping\n"));
 133                 return(False);
 134         }
 135
 136         /* the key is the SID, retrieving is direct */
 137
 138         sid_to_string(string_sid, &sid);
 139         slprintf(key, sizeof(key), "%s%s", GROUP_PREFIX, string_sid);
 140
 141         kbuf.dptr = key;
 142         kbuf.dsize = strlen(key)+1;
 143
 144         dbuf = tdb_fetch(tdb, kbuf);
 145         if (!dbuf.dptr)
 146                 return False;
 147
 148         ret = tdb_unpack(dbuf.dptr, dbuf.dsize, "ddff",
 149                                 &map->gid, &map->sid_name_use, &map->nt_name, &map->comment);
 150
 151         SAFE_FREE(dbuf.dptr);
 152
 153         if ( ret == -1 ) {
 154                 DEBUG(3,("get_group_map_from_sid: tdb_unpack failure\n"));
 155                 return False;
 156         }
 157
 158         sid_copy(&map->sid, &sid);
 159
 160         return True;
 161 }
 162
 163 /****************************************************************************
 164  Return the sid and the type of the unix group.
 165 ****************************************************************************/
 166
 167  BOOL get_group_map_from_gid(gid_t gid, GROUP_MAP *map)
 168 {
 169         TDB_DATA kbuf, dbuf, newkey;
 170         fstring string_sid;
 171         int ret;
 172
 173         if(!init_group_mapping()) {
 174                 DEBUG(0,("failed to initialize group mapping\n"));
 175                 return(False);
 176         }
 177
 178         /* we need to enumerate the TDB to find the GID */
 179
 180         for (kbuf = tdb_firstkey(tdb);
 181              kbuf.dptr;
 182              newkey = tdb_nextkey(tdb, kbuf), safe_free(kbuf.dptr), kbuf=newkey) {
 183
 184                 if (strncmp(kbuf.dptr, GROUP_PREFIX, strlen(GROUP_PREFIX)) != 0) continue;
 185
 186                 dbuf = tdb_fetch(tdb, kbuf);
 187                 if (!dbuf.dptr)
 188                         continue;
 189
 190                 fstrcpy(string_sid, kbuf.dptr+strlen(GROUP_PREFIX));
 191
 192                 string_to_sid(&map->sid, string_sid);
 193
 194                 ret = tdb_unpack(dbuf.dptr, dbuf.dsize, "ddff",
 195                                  &map->gid, &map->sid_name_use, &map->nt_name, &map->comment);
 196
 197                 SAFE_FREE(dbuf.dptr);
 198
 199                 if ( ret == -1 ) {
 200                         DEBUG(3,("get_group_map_from_gid: tdb_unpack failure\n"));
 201                         return False;
 202                 }
 203
 204                 if (gid==map->gid) {
 205                         SAFE_FREE(kbuf.dptr);
 206                         return True;
 207                 }
 208         }
 209
 210         return False;
 211 }
 212
 213 /****************************************************************************
 214  Return the sid and the type of the unix group.
 215 ****************************************************************************/
 216
 217  BOOL get_group_map_from_ntname(const char *name, GROUP_MAP *map)
 218 {
 219         TDB_DATA kbuf, dbuf, newkey;
 220         fstring string_sid;
 221         int ret;
 222
 223         if(!init_group_mapping()) {
 224                 DEBUG(0,("get_group_map_from_ntname:failed to initialize group mapping\n"));
 225                 return(False);
 226         }
 227
 228         /* we need to enumerate the TDB to find the name */
 229
 230         for (kbuf = tdb_firstkey(tdb);
 231              kbuf.dptr;
 232              newkey = tdb_nextkey(tdb, kbuf), safe_free(kbuf.dptr), kbuf=newkey) {
 233
 234                 if (strncmp(kbuf.dptr, GROUP_PREFIX, strlen(GROUP_PREFIX)) != 0) continue;
 235
 236                 dbuf = tdb_fetch(tdb, kbuf);
 237                 if (!dbuf.dptr)
 238                         continue;
 239
 240                 fstrcpy(string_sid, kbuf.dptr+strlen(GROUP_PREFIX));
 241
 242                 string_to_sid(&map->sid, string_sid);
 243
 244                 ret = tdb_unpack(dbuf.dptr, dbuf.dsize, "ddff",
 245                                  &map->gid, &map->sid_name_use, &map->nt_name, &map->comment);
 246
 247                 SAFE_FREE(dbuf.dptr);
 248
 249                 if ( ret == -1 ) {
 250                         DEBUG(3,("get_group_map_from_ntname: tdb_unpack failure\n"));
 251                         return False;
 252                 }
 253
 254                 if ( strequal(name, map->nt_name) ) {
 255                         SAFE_FREE(kbuf.dptr);
 256                         return True;
 257                 }
 258         }
 259
 260         return False;
 261 }
 262
 263 /****************************************************************************
 264  Remove a group mapping entry.
 265 ****************************************************************************/
 266
 267 BOOL group_map_remove(const DOM_SID *sid)
 268 {
 269         TDB_DATA kbuf, dbuf;
 270         pstring key;
 271         fstring string_sid;
 272
 273         if(!init_group_mapping()) {
 274                 DEBUG(0,("failed to initialize group mapping\n"));
 275                 return(False);
 276         }
 277
 278         /* the key is the SID, retrieving is direct */
 279
 280         sid_to_string(string_sid, sid);
 281         slprintf(key, sizeof(key), "%s%s", GROUP_PREFIX, string_sid);
 282
 283         kbuf.dptr = key;
 284         kbuf.dsize = strlen(key)+1;
 285
 286         dbuf = tdb_fetch(tdb, kbuf);
 287         if (!dbuf.dptr)
 288                 return False;
 289
 290         SAFE_FREE(dbuf.dptr);
 291
 292         if(tdb_delete(tdb, kbuf) != TDB_SUCCESS)
 293                 return False;
 294
 295         return True;
 296 }
 297
 298 /****************************************************************************
 299  Enumerate the group mapping.
 300 ****************************************************************************/
 301
 302 BOOL enum_group_mapping(const DOM_SID *domsid, enum SID_NAME_USE sid_name_use, GROUP_MAP **pp_rmap,
 303                         size_t *p_num_entries, BOOL unix_only)
 304 {
 305         TDB_DATA kbuf, dbuf, newkey;
 306         fstring string_sid;
 307         GROUP_MAP map;
 308         GROUP_MAP *mapt;
 309         int ret;
 310         size_t entries=0;
 311         DOM_SID grpsid;
 312         uint32 rid;
 313
 314         if(!init_group_mapping()) {
 315                 DEBUG(0,("failed to initialize group mapping\n"));
 316                 return(False);
 317         }
 318
 319         *p_num_entries=0;
 320         *pp_rmap=NULL;
 321
 322         for (kbuf = tdb_firstkey(tdb);
 323              kbuf.dptr;
 324              newkey = tdb_nextkey(tdb, kbuf), safe_free(kbuf.dptr), kbuf=newkey) {
 325
 326                 if (strncmp(kbuf.dptr, GROUP_PREFIX, strlen(GROUP_PREFIX)) != 0)
 327                         continue;
 328
 329                 dbuf = tdb_fetch(tdb, kbuf);
 330                 if (!dbuf.dptr)
 331                         continue;
 332
 333                 fstrcpy(string_sid, kbuf.dptr+strlen(GROUP_PREFIX));
 334
 335                 ret = tdb_unpack(dbuf.dptr, dbuf.dsize, "ddff",
 336                                  &map.gid, &map.sid_name_use, &map.nt_name, &map.comment);
 337
 338                 SAFE_FREE(dbuf.dptr);
 339
 340                 if ( ret == -1 ) {
 341                         DEBUG(3,("enum_group_mapping: tdb_unpack failure\n"));
 342                         continue;
 343                 }
 344
 345                 /* list only the type or everything if UNKNOWN */
 346                 if (sid_name_use!=SID_NAME_UNKNOWN  && sid_name_use!=map.sid_name_use) {
 347                         DEBUG(11,("enum_group_mapping: group %s is not of the requested type\n", map.nt_name));
 348                         continue;
 349                 }
 350
 351                 if (unix_only==ENUM_ONLY_MAPPED && map.gid==-1) {
 352                         DEBUG(11,("enum_group_mapping: group %s is non mapped\n", map.nt_name));
 353                         continue;
 354                 }
 355
 356                 string_to_sid(&grpsid, string_sid);
 357                 sid_copy( &map.sid, &grpsid );
 358
 359                 sid_split_rid( &grpsid, &rid );
 360
 361                 /* Only check the domain if we were given one */
 362
 363                 if ( domsid && !sid_equal( domsid, &grpsid ) ) {
 364                         DEBUG(11,("enum_group_mapping: group %s is not in domain %s\n",
 365                                 string_sid, sid_string_static(domsid)));
 366                         continue;
 367                 }
 368
 369                 DEBUG(11,("enum_group_mapping: returning group %s of "
 370                           "type %s\n", map.nt_name,
 371                           sid_type_lookup(map.sid_name_use)));
 372
 373                 (*pp_rmap) = SMB_REALLOC_ARRAY((*pp_rmap), GROUP_MAP, entries+1);
 374                 if (!(*pp_rmap)) {
 375                         DEBUG(0,("enum_group_mapping: Unable to enlarge group map!\n"));
 376                         return False;
 377                 }
 378
 379                 mapt = (*pp_rmap);
 380
 381                 mapt[entries].gid = map.gid;
 382                 sid_copy( &mapt[entries].sid, &map.sid);
 383                 mapt[entries].sid_name_use = map.sid_name_use;
 384                 fstrcpy(mapt[entries].nt_name, map.nt_name);
 385                 fstrcpy(mapt[entries].comment, map.comment);
 386
 387                 entries++;
 388
 389         }
 390
 391         *p_num_entries=entries;
 392
 393         return True;
 394 }
 395
 396 /* This operation happens on session setup, so it should better be fast. We
 397  * store a list of aliases a SID is member of hanging off MEMBEROF/SID. */
 398
 399  NTSTATUS one_alias_membership(const DOM_SID *member,
 400                                DOM_SID **sids, size_t *num)
 401 {
 402         fstring key, string_sid;
 403         TDB_DATA kbuf, dbuf;
 404         const char *p;
 405
 406         if (!init_group_mapping()) {
 407                 DEBUG(0,("failed to initialize group mapping\n"));
 408                 return NT_STATUS_ACCESS_DENIED;
 409         }
 410
 411         sid_to_string(string_sid, member);
 412         slprintf(key, sizeof(key), "%s%s", MEMBEROF_PREFIX, string_sid);
 413
 414         kbuf.dsize = strlen(key)+1;
 415         kbuf.dptr = key;
 416
 417         dbuf = tdb_fetch(tdb, kbuf);
 418
 419         if (dbuf.dptr == NULL) {
 420                 return NT_STATUS_OK;
 421         }
 422
 423         p = dbuf.dptr;
 424
 425         while (next_token(&p, string_sid, " ", sizeof(string_sid))) {
 426
 427                 DOM_SID alias;
 428
 429                 if (!string_to_sid(&alias, string_sid))
 430                         continue;
 431
 432                 add_sid_to_array_unique(NULL, &alias, sids, num);
 433
 434                 if (sids == NULL)
 435                         return NT_STATUS_NO_MEMORY;
 436         }
 437
 438         SAFE_FREE(dbuf.dptr);
 439         return NT_STATUS_OK;
 440 }
 441
 442 static NTSTATUS alias_memberships(const DOM_SID *members, size_t num_members,
 443                                   DOM_SID **sids, size_t *num)
 444 {
 445         size_t i;
 446
 447         *num = 0;
 448         *sids = NULL;
 449
 450         for (i=0; i<num_members; i++) {
 451                 NTSTATUS status = one_alias_membership(&members[i], sids, num);
 452                 if (!NT_STATUS_IS_OK(status))
 453                         return status;
 454         }
 455         return NT_STATUS_OK;
 456 }
 457
 458 static BOOL is_aliasmem(const DOM_SID *alias, const DOM_SID *member)
 459 {
 460         DOM_SID *sids;
 461         size_t i, num;
 462
 463         /* This feels the wrong way round, but the on-disk data structure
 464          * dictates it this way. */
 465         if (!NT_STATUS_IS_OK(alias_memberships(member, 1, &sids, &num)))
 466                 return False;
 467
 468         for (i=0; i<num; i++) {
 469                 if (sid_compare(alias, &sids[i]) == 0) {
 470                         SAFE_FREE(sids);
 471                         return True;
 472                 }
 473         }
 474         SAFE_FREE(sids);
 475         return False;
 476 }
 477
 478
 479  NTSTATUS add_aliasmem(const DOM_SID *alias, const DOM_SID *member)
 480 {
 481         GROUP_MAP map;
 482         TDB_DATA kbuf, dbuf;
 483         pstring key;
 484         fstring string_sid;
 485         char *new_memberstring;
 486         int result;
 487
 488         if(!init_group_mapping()) {
 489                 DEBUG(0,("failed to initialize group mapping\n"));
 490                 return NT_STATUS_ACCESS_DENIED;
 491         }
 492
 493         if (!get_group_map_from_sid(*alias, &map))
 494                 return NT_STATUS_NO_SUCH_ALIAS;
 495
 496         if ( (map.sid_name_use != SID_NAME_ALIAS) &&
 497              (map.sid_name_use != SID_NAME_WKN_GRP) )
 498                 return NT_STATUS_NO_SUCH_ALIAS;
 499
 500         if (is_aliasmem(alias, member))
 501                 return NT_STATUS_MEMBER_IN_ALIAS;
 502
 503         sid_to_string(string_sid, member);
 504         slprintf(key, sizeof(key), "%s%s", MEMBEROF_PREFIX, string_sid);
 505
 506         kbuf.dsize = strlen(key)+1;
 507         kbuf.dptr = key;
 508
 509         dbuf = tdb_fetch(tdb, kbuf);
 510
 511         sid_to_string(string_sid, alias);
 512
 513         if (dbuf.dptr != NULL) {
 514                 asprintf(&new_memberstring, "%s %s", (char *)(dbuf.dptr),
 515                          string_sid);
 516         } else {
 517                 new_memberstring = SMB_STRDUP(string_sid);
 518         }
 519
 520         if (new_memberstring == NULL)
 521                 return NT_STATUS_NO_MEMORY;
 522
 523         SAFE_FREE(dbuf.dptr);
 524         dbuf.dsize = strlen(new_memberstring)+1;
 525         dbuf.dptr = new_memberstring;
 526
 527         result = tdb_store(tdb, kbuf, dbuf, 0);
 528
 529         SAFE_FREE(new_memberstring);
 530
 531         return (result == 0 ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED);
 532 }
 533
 534 struct aliasmem_closure {
 535         const DOM_SID *alias;
 536         DOM_SID **sids;
 537         size_t *num;
 538 };
 539
 540 static int collect_aliasmem(TDB_CONTEXT *tdb_ctx, TDB_DATA key, TDB_DATA data,
 541                             void *state)
 542 {
 543         struct aliasmem_closure *closure = (struct aliasmem_closure *)state;
 544         const char *p;
 545         fstring alias_string;
 546
 547         if (strncmp(key.dptr, MEMBEROF_PREFIX,
 548                     strlen(MEMBEROF_PREFIX)) != 0)
 549                 return 0;
 550
 551         p = data.dptr;
 552
 553         while (next_token(&p, alias_string, " ", sizeof(alias_string))) {
 554
 555                 DOM_SID alias, member;
 556                 const char *member_string;
 557
 558
 559                 if (!string_to_sid(&alias, alias_string))
 560                         continue;
 561
 562                 if (sid_compare(closure->alias, &alias) != 0)
 563                         continue;
 564
 565                 /* Ok, we found the alias we're looking for in the membership
 566                  * list currently scanned. The key represents the alias
 567                  * member. Add that. */
 568
 569                 member_string = strchr(key.dptr, '/');
 570
 571                 /* Above we tested for MEMBEROF_PREFIX which includes the
 572                  * slash. */
 573
 574                 SMB_ASSERT(member_string != NULL);
 575                 member_string += 1;
 576
 577                 if (!string_to_sid(&member, member_string))
 578                         continue;
 579
 580                 add_sid_to_array(NULL, &member, closure->sids, closure->num);
 581         }
 582
 583         return 0;
 584 }
 585
 586  NTSTATUS enum_aliasmem(const DOM_SID *alias, DOM_SID **sids, size_t *num)
 587 {
 588         GROUP_MAP map;
 589         struct aliasmem_closure closure;
 590
 591         if(!init_group_mapping()) {
 592                 DEBUG(0,("failed to initialize group mapping\n"));
 593                 return NT_STATUS_ACCESS_DENIED;
 594         }
 595
 596         if (!get_group_map_from_sid(*alias, &map))
 597                 return NT_STATUS_NO_SUCH_ALIAS;
 598
 599         if ( (map.sid_name_use != SID_NAME_ALIAS) &&
 600              (map.sid_name_use != SID_NAME_WKN_GRP) )
 601                 return NT_STATUS_NO_SUCH_ALIAS;
 602
 603         *sids = NULL;
 604         *num = 0;
 605
 606         closure.alias = alias;
 607         closure.sids = sids;
 608         closure.num = num;
 609
 610         tdb_traverse(tdb, collect_aliasmem, &closure);
 611         return NT_STATUS_OK;
 612 }
 613
 614  NTSTATUS del_aliasmem(const DOM_SID *alias, const DOM_SID *member)
 615 {
 616         NTSTATUS result;
 617         DOM_SID *sids;
 618         size_t i, num;
 619         BOOL found = False;
 620         char *member_string;
 621         TDB_DATA kbuf, dbuf;
 622         pstring key;
 623         fstring sid_string;
 624
 625         result = alias_memberships(member, 1, &sids, &num);
 626
 627         if (!NT_STATUS_IS_OK(result))
 628                 return result;
 629
 630         for (i=0; i<num; i++) {
 631                 if (sid_compare(&sids[i], alias) == 0) {
 632                         found = True;
 633                         break;
 634                 }
 635         }
 636
 637         if (!found) {
 638                 SAFE_FREE(sids);
 639                 return NT_STATUS_MEMBER_NOT_IN_ALIAS;
 640         }
 641
 642         if (i < num)
 643                 sids[i] = sids[num-1];
 644
 645         num -= 1;
 646
 647         sid_to_string(sid_string, member);
 648         slprintf(key, sizeof(key), "%s%s", MEMBEROF_PREFIX, sid_string);
 649
 650         kbuf.dsize = strlen(key)+1;
 651         kbuf.dptr = key;
 652
 653         if (num == 0)
 654                 return tdb_delete(tdb, kbuf) == 0 ?
 655                         NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL;
 656
 657         member_string = SMB_STRDUP("");
 658
 659         if (member_string == NULL) {
 660                 SAFE_FREE(sids);
 661                 return NT_STATUS_NO_MEMORY;
 662         }
 663
 664         for (i=0; i<num; i++) {
 665                 char *s = member_string;
 666
 667                 sid_to_string(sid_string, &sids[i]);
 668                 asprintf(&member_string, "%s %s", s, sid_string);
 669
 670                 SAFE_FREE(s);
 671                 if (member_string == NULL) {
 672                         SAFE_FREE(sids);
 673                         return NT_STATUS_NO_MEMORY;
 674                 }
 675         }
 676
 677         dbuf.dsize = strlen(member_string)+1;
 678         dbuf.dptr = member_string;
 679
 680         result = tdb_store(tdb, kbuf, dbuf, 0) == 0 ?
 681                 NT_STATUS_OK : NT_STATUS_ACCESS_DENIED;
 682
 683         SAFE_FREE(sids);
 684         SAFE_FREE(member_string);
 685
 686         return result;
 687 }
 688