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 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         dbuf.dsize = len;
 111         dbuf.dptr = buf;
 112         if (tdb_store_bystring(tdb, key, dbuf, flag) != 0) return False;
 113
 114         return True;
 115 }
 116
 117
 118 /****************************************************************************
 119  Return the sid and the type of the unix group.
 120 ****************************************************************************/
 121
 122  BOOL get_group_map_from_sid(DOM_SID sid, GROUP_MAP *map)
 123 {
 124         TDB_DATA dbuf;
 125         pstring key;
 126         fstring string_sid;
 127         int ret = 0;
 128
 129         if(!init_group_mapping()) {
 130                 DEBUG(0,("failed to initialize group mapping\n"));
 131                 return(False);
 132         }
 133
 134         /* the key is the SID, retrieving is direct */
 135
 136         sid_to_string(string_sid, &sid);
 137         slprintf(key, sizeof(key), "%s%s", GROUP_PREFIX, string_sid);
 138
 139         dbuf = tdb_fetch_bystring(tdb, key);
 140         if (!dbuf.dptr)
 141                 return False;
 142
 143         ret = tdb_unpack(dbuf.dptr, dbuf.dsize, "ddff",
 144                                 &map->gid, &map->sid_name_use, &map->nt_name, &map->comment);
 145
 146         SAFE_FREE(dbuf.dptr);
 147
 148         if ( ret == -1 ) {
 149                 DEBUG(3,("get_group_map_from_sid: tdb_unpack failure\n"));
 150                 return False;
 151         }
 152
 153         sid_copy(&map->sid, &sid);
 154
 155         return True;
 156 }
 157
 158 /****************************************************************************
 159  Return the sid and the type of the unix group.
 160 ****************************************************************************/
 161
 162  BOOL get_group_map_from_gid(gid_t gid, GROUP_MAP *map)
 163 {
 164         TDB_DATA kbuf, dbuf, newkey;
 165         fstring string_sid;
 166         int ret;
 167
 168         if(!init_group_mapping()) {
 169                 DEBUG(0,("failed to initialize group mapping\n"));
 170                 return(False);
 171         }
 172
 173         /* we need to enumerate the TDB to find the GID */
 174
 175         for (kbuf = tdb_firstkey(tdb);
 176              kbuf.dptr;
 177              newkey = tdb_nextkey(tdb, kbuf), safe_free(kbuf.dptr), kbuf=newkey) {
 178
 179                 if (strncmp(kbuf.dptr, GROUP_PREFIX, strlen(GROUP_PREFIX)) != 0) continue;
 180
 181                 dbuf = tdb_fetch(tdb, kbuf);
 182                 if (!dbuf.dptr)
 183                         continue;
 184
 185                 fstrcpy(string_sid, kbuf.dptr+strlen(GROUP_PREFIX));
 186
 187                 string_to_sid(&map->sid, string_sid);
 188
 189                 ret = tdb_unpack(dbuf.dptr, dbuf.dsize, "ddff",
 190                                  &map->gid, &map->sid_name_use, &map->nt_name, &map->comment);
 191
 192                 SAFE_FREE(dbuf.dptr);
 193
 194                 if ( ret == -1 ) {
 195                         DEBUG(3,("get_group_map_from_gid: tdb_unpack failure\n"));
 196                         return False;
 197                 }
 198
 199                 if (gid==map->gid) {
 200                         SAFE_FREE(kbuf.dptr);
 201                         return True;
 202                 }
 203         }
 204
 205         return False;
 206 }
 207
 208 /****************************************************************************
 209  Return the sid and the type of the unix group.
 210 ****************************************************************************/
 211
 212  BOOL get_group_map_from_ntname(const char *name, GROUP_MAP *map)
 213 {
 214         TDB_DATA kbuf, dbuf, newkey;
 215         fstring string_sid;
 216         int ret;
 217
 218         if(!init_group_mapping()) {
 219                 DEBUG(0,("get_group_map_from_ntname:failed to initialize group mapping\n"));
 220                 return(False);
 221         }
 222
 223         /* we need to enumerate the TDB to find the name */
 224
 225         for (kbuf = tdb_firstkey(tdb);
 226              kbuf.dptr;
 227              newkey = tdb_nextkey(tdb, kbuf), safe_free(kbuf.dptr), kbuf=newkey) {
 228
 229                 if (strncmp(kbuf.dptr, GROUP_PREFIX, strlen(GROUP_PREFIX)) != 0) continue;
 230
 231                 dbuf = tdb_fetch(tdb, kbuf);
 232                 if (!dbuf.dptr)
 233                         continue;
 234
 235                 fstrcpy(string_sid, kbuf.dptr+strlen(GROUP_PREFIX));
 236
 237                 string_to_sid(&map->sid, string_sid);
 238
 239                 ret = tdb_unpack(dbuf.dptr, dbuf.dsize, "ddff",
 240                                  &map->gid, &map->sid_name_use, &map->nt_name, &map->comment);
 241
 242                 SAFE_FREE(dbuf.dptr);
 243
 244                 if ( ret == -1 ) {
 245                         DEBUG(3,("get_group_map_from_ntname: tdb_unpack failure\n"));
 246                         return False;
 247                 }
 248
 249                 if ( strequal(name, map->nt_name) ) {
 250                         SAFE_FREE(kbuf.dptr);
 251                         return True;
 252                 }
 253         }
 254
 255         return False;
 256 }
 257
 258 /****************************************************************************
 259  Remove a group mapping entry.
 260 ****************************************************************************/
 261
 262 BOOL group_map_remove(const DOM_SID *sid)
 263 {
 264         TDB_DATA dbuf;
 265         pstring key;
 266         fstring string_sid;
 267
 268         if(!init_group_mapping()) {
 269                 DEBUG(0,("failed to initialize group mapping\n"));
 270                 return(False);
 271         }
 272
 273         /* the key is the SID, retrieving is direct */
 274
 275         sid_to_string(string_sid, sid);
 276         slprintf(key, sizeof(key), "%s%s", GROUP_PREFIX, string_sid);
 277
 278         dbuf = tdb_fetch_bystring(tdb, key);
 279         if (!dbuf.dptr)
 280                 return False;
 281
 282         SAFE_FREE(dbuf.dptr);
 283
 284         if(tdb_delete_bystring(tdb, key) != TDB_SUCCESS)
 285                 return False;
 286
 287         return True;
 288 }
 289
 290 /****************************************************************************
 291  Enumerate the group mapping.
 292 ****************************************************************************/
 293
 294 BOOL enum_group_mapping(const DOM_SID *domsid, enum lsa_SidType sid_name_use, GROUP_MAP **pp_rmap,
 295                         size_t *p_num_entries, BOOL unix_only)
 296 {
 297         TDB_DATA kbuf, dbuf, newkey;
 298         fstring string_sid;
 299         GROUP_MAP map;
 300         GROUP_MAP *mapt;
 301         int ret;
 302         size_t entries=0;
 303         DOM_SID grpsid;
 304         uint32 rid;
 305
 306         if(!init_group_mapping()) {
 307                 DEBUG(0,("failed to initialize group mapping\n"));
 308                 return(False);
 309         }
 310
 311         *p_num_entries=0;
 312         *pp_rmap=NULL;
 313
 314         for (kbuf = tdb_firstkey(tdb);
 315              kbuf.dptr;
 316              newkey = tdb_nextkey(tdb, kbuf), safe_free(kbuf.dptr), kbuf=newkey) {
 317
 318                 if (strncmp(kbuf.dptr, GROUP_PREFIX, strlen(GROUP_PREFIX)) != 0)
 319                         continue;
 320
 321                 dbuf = tdb_fetch(tdb, kbuf);
 322                 if (!dbuf.dptr)
 323                         continue;
 324
 325                 fstrcpy(string_sid, kbuf.dptr+strlen(GROUP_PREFIX));
 326
 327                 ret = tdb_unpack(dbuf.dptr, dbuf.dsize, "ddff",
 328                                  &map.gid, &map.sid_name_use, &map.nt_name, &map.comment);
 329
 330                 SAFE_FREE(dbuf.dptr);
 331
 332                 if ( ret == -1 ) {
 333                         DEBUG(3,("enum_group_mapping: tdb_unpack failure\n"));
 334                         continue;
 335                 }
 336
 337                 /* list only the type or everything if UNKNOWN */
 338                 if (sid_name_use!=SID_NAME_UNKNOWN  && sid_name_use!=map.sid_name_use) {
 339                         DEBUG(11,("enum_group_mapping: group %s is not of the requested type\n", map.nt_name));
 340                         continue;
 341                 }
 342
 343                 if (unix_only==ENUM_ONLY_MAPPED && map.gid==-1) {
 344                         DEBUG(11,("enum_group_mapping: group %s is non mapped\n", map.nt_name));
 345                         continue;
 346                 }
 347
 348                 string_to_sid(&grpsid, string_sid);
 349                 sid_copy( &map.sid, &grpsid );
 350
 351                 sid_split_rid( &grpsid, &rid );
 352
 353                 /* Only check the domain if we were given one */
 354
 355                 if ( domsid && !sid_equal( domsid, &grpsid ) ) {
 356                         DEBUG(11,("enum_group_mapping: group %s is not in domain %s\n",
 357                                 string_sid, sid_string_static(domsid)));
 358                         continue;
 359                 }
 360
 361                 DEBUG(11,("enum_group_mapping: returning group %s of "
 362                           "type %s\n", map.nt_name,
 363                           sid_type_lookup(map.sid_name_use)));
 364
 365                 (*pp_rmap) = SMB_REALLOC_ARRAY((*pp_rmap), GROUP_MAP, entries+1);
 366                 if (!(*pp_rmap)) {
 367                         DEBUG(0,("enum_group_mapping: Unable to enlarge group map!\n"));
 368                         return False;
 369                 }
 370
 371                 mapt = (*pp_rmap);
 372
 373                 mapt[entries].gid = map.gid;
 374                 sid_copy( &mapt[entries].sid, &map.sid);
 375                 mapt[entries].sid_name_use = map.sid_name_use;
 376                 fstrcpy(mapt[entries].nt_name, map.nt_name);
 377                 fstrcpy(mapt[entries].comment, map.comment);
 378
 379                 entries++;
 380
 381         }
 382
 383         *p_num_entries=entries;
 384
 385         return True;
 386 }
 387
 388 /* This operation happens on session setup, so it should better be fast. We
 389  * store a list of aliases a SID is member of hanging off MEMBEROF/SID. */
 390
 391  NTSTATUS one_alias_membership(const DOM_SID *member,
 392                                DOM_SID **sids, size_t *num)
 393 {
 394         fstring key, string_sid;
 395         TDB_DATA dbuf;
 396         const char *p;
 397
 398         if (!init_group_mapping()) {
 399                 DEBUG(0,("failed to initialize group mapping\n"));
 400                 return NT_STATUS_ACCESS_DENIED;
 401         }
 402
 403         sid_to_string(string_sid, member);
 404         slprintf(key, sizeof(key), "%s%s", MEMBEROF_PREFIX, string_sid);
 405
 406         dbuf = tdb_fetch_bystring(tdb, key);
 407
 408         if (dbuf.dptr == NULL) {
 409                 return NT_STATUS_OK;
 410         }
 411
 412         p = dbuf.dptr;
 413
 414         while (next_token(&p, string_sid, " ", sizeof(string_sid))) {
 415
 416                 DOM_SID alias;
 417
 418                 if (!string_to_sid(&alias, string_sid))
 419                         continue;
 420
 421                 if (!add_sid_to_array_unique(NULL, &alias, sids, num)) {
 422                         return NT_STATUS_NO_MEMORY;
 423                 }
 424         }
 425
 426         SAFE_FREE(dbuf.dptr);
 427         return NT_STATUS_OK;
 428 }
 429
 430 static NTSTATUS alias_memberships(const DOM_SID *members, size_t num_members,
 431                                   DOM_SID **sids, size_t *num)
 432 {
 433         size_t i;
 434
 435         *num = 0;
 436         *sids = NULL;
 437
 438         for (i=0; i<num_members; i++) {
 439                 NTSTATUS status = one_alias_membership(&members[i], sids, num);
 440                 if (!NT_STATUS_IS_OK(status))
 441                         return status;
 442         }
 443         return NT_STATUS_OK;
 444 }
 445
 446 static BOOL is_aliasmem(const DOM_SID *alias, const DOM_SID *member)
 447 {
 448         DOM_SID *sids;
 449         size_t i, num;
 450
 451         /* This feels the wrong way round, but the on-disk data structure
 452          * dictates it this way. */
 453         if (!NT_STATUS_IS_OK(alias_memberships(member, 1, &sids, &num)))
 454                 return False;
 455
 456         for (i=0; i<num; i++) {
 457                 if (sid_compare(alias, &sids[i]) == 0) {
 458                         SAFE_FREE(sids);
 459                         return True;
 460                 }
 461         }
 462         SAFE_FREE(sids);
 463         return False;
 464 }
 465
 466
 467  NTSTATUS add_aliasmem(const DOM_SID *alias, const DOM_SID *member)
 468 {
 469         GROUP_MAP map;
 470         TDB_DATA dbuf;
 471         pstring key;
 472         fstring string_sid;
 473         char *new_memberstring;
 474         int result;
 475
 476         if(!init_group_mapping()) {
 477                 DEBUG(0,("failed to initialize group mapping\n"));
 478                 return NT_STATUS_ACCESS_DENIED;
 479         }
 480
 481         if (!get_group_map_from_sid(*alias, &map))
 482                 return NT_STATUS_NO_SUCH_ALIAS;
 483
 484         if ( (map.sid_name_use != SID_NAME_ALIAS) &&
 485              (map.sid_name_use != SID_NAME_WKN_GRP) )
 486                 return NT_STATUS_NO_SUCH_ALIAS;
 487
 488         if (is_aliasmem(alias, member))
 489                 return NT_STATUS_MEMBER_IN_ALIAS;
 490
 491         sid_to_string(string_sid, member);
 492         slprintf(key, sizeof(key), "%s%s", MEMBEROF_PREFIX, string_sid);
 493
 494         dbuf = tdb_fetch_bystring(tdb, key);
 495
 496         sid_to_string(string_sid, alias);
 497
 498         if (dbuf.dptr != NULL) {
 499                 asprintf(&new_memberstring, "%s %s", (char *)(dbuf.dptr),
 500                          string_sid);
 501         } else {
 502                 new_memberstring = SMB_STRDUP(string_sid);
 503         }
 504
 505         if (new_memberstring == NULL)
 506                 return NT_STATUS_NO_MEMORY;
 507
 508         SAFE_FREE(dbuf.dptr);
 509         dbuf = string_term_tdb_data(new_memberstring);
 510
 511         result = tdb_store_bystring(tdb, key, dbuf, 0);
 512
 513         SAFE_FREE(new_memberstring);
 514
 515         return (result == 0 ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED);
 516 }
 517
 518 struct aliasmem_closure {
 519         const DOM_SID *alias;
 520         DOM_SID **sids;
 521         size_t *num;
 522 };
 523
 524 static int collect_aliasmem(TDB_CONTEXT *tdb_ctx, TDB_DATA key, TDB_DATA data,
 525                             void *state)
 526 {
 527         struct aliasmem_closure *closure = (struct aliasmem_closure *)state;
 528         const char *p;
 529         fstring alias_string;
 530
 531         if (strncmp(key.dptr, MEMBEROF_PREFIX,
 532                     strlen(MEMBEROF_PREFIX)) != 0)
 533                 return 0;
 534
 535         p = data.dptr;
 536
 537         while (next_token(&p, alias_string, " ", sizeof(alias_string))) {
 538
 539                 DOM_SID alias, member;
 540                 const char *member_string;
 541
 542
 543                 if (!string_to_sid(&alias, alias_string))
 544                         continue;
 545
 546                 if (sid_compare(closure->alias, &alias) != 0)
 547                         continue;
 548
 549                 /* Ok, we found the alias we're looking for in the membership
 550                  * list currently scanned. The key represents the alias
 551                  * member. Add that. */
 552
 553                 member_string = strchr(key.dptr, '/');
 554
 555                 /* Above we tested for MEMBEROF_PREFIX which includes the
 556                  * slash. */
 557
 558                 SMB_ASSERT(member_string != NULL);
 559                 member_string += 1;
 560
 561                 if (!string_to_sid(&member, member_string))
 562                         continue;
 563
 564                 if (!add_sid_to_array(NULL, &member, closure->sids, closure->num)) {
 565                         /* talloc fail. */
 566                         break;
 567                 }
 568         }
 569
 570         return 0;
 571 }
 572
 573  NTSTATUS enum_aliasmem(const DOM_SID *alias, DOM_SID **sids, size_t *num)
 574 {
 575         GROUP_MAP map;
 576         struct aliasmem_closure closure;
 577
 578         if(!init_group_mapping()) {
 579                 DEBUG(0,("failed to initialize group mapping\n"));
 580                 return NT_STATUS_ACCESS_DENIED;
 581         }
 582
 583         if (!get_group_map_from_sid(*alias, &map))
 584                 return NT_STATUS_NO_SUCH_ALIAS;
 585
 586         if ( (map.sid_name_use != SID_NAME_ALIAS) &&
 587              (map.sid_name_use != SID_NAME_WKN_GRP) )
 588                 return NT_STATUS_NO_SUCH_ALIAS;
 589
 590         *sids = NULL;
 591         *num = 0;
 592
 593         closure.alias = alias;
 594         closure.sids = sids;
 595         closure.num = num;
 596
 597         tdb_traverse(tdb, collect_aliasmem, &closure);
 598         return NT_STATUS_OK;
 599 }
 600
 601  NTSTATUS del_aliasmem(const DOM_SID *alias, const DOM_SID *member)
 602 {
 603         NTSTATUS result;
 604         DOM_SID *sids;
 605         size_t i, num;
 606         BOOL found = False;
 607         char *member_string;
 608         TDB_DATA dbuf;
 609         pstring key;
 610         fstring sid_string;
 611
 612         result = alias_memberships(member, 1, &sids, &num);
 613
 614         if (!NT_STATUS_IS_OK(result))
 615                 return result;
 616
 617         for (i=0; i<num; i++) {
 618                 if (sid_compare(&sids[i], alias) == 0) {
 619                         found = True;
 620                         break;
 621                 }
 622         }
 623
 624         if (!found) {
 625                 SAFE_FREE(sids);
 626                 return NT_STATUS_MEMBER_NOT_IN_ALIAS;
 627         }
 628
 629         if (i < num)
 630                 sids[i] = sids[num-1];
 631
 632         num -= 1;
 633
 634         sid_to_string(sid_string, member);
 635         slprintf(key, sizeof(key), "%s%s", MEMBEROF_PREFIX, sid_string);
 636
 637         if (num == 0)
 638                 return tdb_delete_bystring(tdb, key) == 0 ?
 639                         NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL;
 640
 641         member_string = SMB_STRDUP("");
 642
 643         if (member_string == NULL) {
 644                 SAFE_FREE(sids);
 645                 return NT_STATUS_NO_MEMORY;
 646         }
 647
 648         for (i=0; i<num; i++) {
 649                 char *s = member_string;
 650
 651                 sid_to_string(sid_string, &sids[i]);
 652                 asprintf(&member_string, "%s %s", s, sid_string);
 653
 654                 SAFE_FREE(s);
 655                 if (member_string == NULL) {
 656                         SAFE_FREE(sids);
 657                         return NT_STATUS_NO_MEMORY;
 658                 }
 659         }
 660
 661         dbuf = string_term_tdb_data(member_string);
 662
 663         result = tdb_store_bystring(tdb, key, dbuf, 0) == 0 ?
 664                 NT_STATUS_OK : NT_STATUS_ACCESS_DENIED;
 665
 666         SAFE_FREE(sids);
 667         SAFE_FREE(member_string);
 668
 669         return result;
 670 }
 671