source/winbindd/idmap_tdb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    idmap TDB backend
   5
   6    Copyright (C) Tim Potter 2000
   7    Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
   8    Copyright (C) Jeremy Allison 2006
   9    Copyright (C) Simo Sorce 2003-2006
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "winbindd.h"
  27
  28 #undef DBGC_CLASS
  29 #define DBGC_CLASS DBGC_IDMAP
  30
  31 /* High water mark keys */
  32 #define HWM_GROUP  "GROUP HWM"
  33 #define HWM_USER   "USER HWM"
  34
  35 static struct idmap_tdb_state {
  36
  37         /* User and group id pool */
  38         uid_t low_uid, high_uid;               /* Range of uids to allocate */
  39         gid_t low_gid, high_gid;               /* Range of gids to allocate */
  40
  41 } idmap_tdb_state;
  42
  43 /*****************************************************************************
  44  For idmap conversion: convert one record to new format
  45  Ancient versions (eg 2.2.3a) of winbindd_idmap.tdb mapped DOMAINNAME/rid
  46  instead of the SID.
  47 *****************************************************************************/
  48 static int convert_fn(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA data, void *state)
  49 {
  50         struct winbindd_domain *domain;
  51         char *p;
  52         DOM_SID sid;
  53         uint32 rid;
  54         fstring keystr;
  55         fstring dom_name;
  56         TDB_DATA key2;
  57         bool *failed = (bool *)state;
  58
  59         DEBUG(10,("Converting %s\n", (const char *)key.dptr));
  60
  61         p = strchr((const char *)key.dptr, '/');
  62         if (!p)
  63                 return 0;
  64
  65         *p = 0;
  66         fstrcpy(dom_name, (const char *)key.dptr);
  67         *p++ = '/';
  68
  69         domain = find_domain_from_name(dom_name);
  70         if (domain == NULL) {
  71                 /* We must delete the old record. */
  72                 DEBUG(0,("Unable to find domain %s\n", dom_name ));
  73                 DEBUG(0,("deleting record %s\n", (const char *)key.dptr ));
  74
  75                 if (tdb_delete(tdb, key) != 0) {
  76                         DEBUG(0, ("Unable to delete record %s\n", (const char *)key.dptr));
  77                         *failed = True;
  78                         return -1;
  79                 }
  80
  81                 return 0;
  82         }
  83
  84         rid = atoi(p);
  85
  86         sid_copy(&sid, &domain->sid);
  87         sid_append_rid(&sid, rid);
  88
  89         sid_to_fstring(keystr, &sid);
  90         key2 = string_term_tdb_data(keystr);
  91
  92         if (tdb_store(tdb, key2, data, TDB_INSERT) != 0) {
  93                 DEBUG(0,("Unable to add record %s\n", (const char *)key2.dptr ));
  94                 *failed = True;
  95                 return -1;
  96         }
  97
  98         if (tdb_store(tdb, data, key2, TDB_REPLACE) != 0) {
  99                 DEBUG(0,("Unable to update record %s\n", (const char *)data.dptr ));
 100                 *failed = True;
 101                 return -1;
 102         }
 103
 104         if (tdb_delete(tdb, key) != 0) {
 105                 DEBUG(0,("Unable to delete record %s\n", (const char *)key.dptr ));
 106                 *failed = True;
 107                 return -1;
 108         }
 109
 110         return 0;
 111 }
 112
 113 /*****************************************************************************
 114  Convert the idmap database from an older version.
 115 *****************************************************************************/
 116
 117 static bool idmap_tdb_upgrade(const char *idmap_name)
 118 {
 119         int32 vers;
 120         bool bigendianheader;
 121         bool failed = False;
 122         TDB_CONTEXT *idmap_tdb;
 123
 124         DEBUG(0, ("Upgrading winbindd_idmap.tdb from an old version\n"));
 125
 126         if (!(idmap_tdb = tdb_open_log(idmap_name, 0,
 127                                         TDB_DEFAULT, O_RDWR,
 128                                         0600))) {
 129                 DEBUG(0, ("Unable to open idmap database\n"));
 130                 return False;
 131         }
 132
 133         bigendianheader = (tdb_get_flags(idmap_tdb) & TDB_BIGENDIAN) ? True : False;
 134
 135         vers = tdb_fetch_int32(idmap_tdb, "IDMAP_VERSION");
 136
 137         if (((vers == -1) && bigendianheader) || (IREV(vers) == IDMAP_VERSION)) {
 138                 /* Arrggghh ! Bytereversed or old big-endian - make order independent ! */
 139                 /*
 140                  * high and low records were created on a
 141                  * big endian machine and will need byte-reversing.
 142                  */
 143
 144                 int32 wm;
 145
 146                 wm = tdb_fetch_int32(idmap_tdb, HWM_USER);
 147
 148                 if (wm != -1) {
 149                         wm = IREV(wm);
 150                 }  else {
 151                         wm = idmap_tdb_state.low_uid;
 152                 }
 153
 154                 if (tdb_store_int32(idmap_tdb, HWM_USER, wm) == -1) {
 155                         DEBUG(0, ("Unable to byteswap user hwm in idmap database\n"));
 156                         tdb_close(idmap_tdb);
 157                         return False;
 158                 }
 159
 160                 wm = tdb_fetch_int32(idmap_tdb, HWM_GROUP);
 161                 if (wm != -1) {
 162                         wm = IREV(wm);
 163                 } else {
 164                         wm = idmap_tdb_state.low_gid;
 165                 }
 166
 167                 if (tdb_store_int32(idmap_tdb, HWM_GROUP, wm) == -1) {
 168                         DEBUG(0, ("Unable to byteswap group hwm in idmap database\n"));
 169                         tdb_close(idmap_tdb);
 170                         return False;
 171                 }
 172         }
 173
 174         /* the old format stored as DOMAIN/rid - now we store the SID direct */
 175         tdb_traverse(idmap_tdb, convert_fn, &failed);
 176
 177         if (failed) {
 178                 DEBUG(0, ("Problem during conversion\n"));
 179                 tdb_close(idmap_tdb);
 180                 return False;
 181         }
 182
 183         if (tdb_store_int32(idmap_tdb, "IDMAP_VERSION", IDMAP_VERSION) == -1) {
 184                 DEBUG(0, ("Unable to dtore idmap version in databse\n"));
 185                 tdb_close(idmap_tdb);
 186                 return False;
 187         }
 188
 189         tdb_close(idmap_tdb);
 190         return True;
 191 }
 192
 193 /* WARNING: We can't open a tdb twice inthe same process, for that reason
 194  * I'm going to use a hack with open ref counts to open the winbindd_idmap.tdb
 195  * only once. We will later decide whether to split the db in multiple files
 196  * or come up with a better solution to share them. */
 197
 198 static TDB_CONTEXT *idmap_tdb_common_ctx;
 199 static int idmap_tdb_open_ref_count = 0;
 200
 201 static NTSTATUS idmap_tdb_open_db(TALLOC_CTX *memctx, TDB_CONTEXT **tdbctx)
 202 {
 203         NTSTATUS ret;
 204         TALLOC_CTX *ctx;
 205         SMB_STRUCT_STAT stbuf;
 206         char *tdbfile = NULL;
 207         int32 version;
 208         bool tdb_is_new = False;
 209
 210         if (idmap_tdb_open_ref_count) { /* the tdb has already been opened */
 211                 idmap_tdb_open_ref_count++;
 212                 *tdbctx = idmap_tdb_common_ctx;
 213                 return NT_STATUS_OK;
 214         }
 215
 216         /* use our own context here */
 217         ctx = talloc_new(memctx);
 218         if (!ctx) {
 219                 DEBUG(0, ("Out of memory!\n"));
 220                 return NT_STATUS_NO_MEMORY;
 221         }
 222
 223         /* use the old database if present */
 224         tdbfile = talloc_strdup(ctx, state_path("winbindd_idmap.tdb"));
 225         if (!tdbfile) {
 226                 DEBUG(0, ("Out of memory!\n"));
 227                 ret = NT_STATUS_NO_MEMORY;
 228                 goto done;
 229         }
 230
 231         if (!file_exist(tdbfile, &stbuf)) {
 232                 tdb_is_new = True;
 233         }
 234
 235         DEBUG(10,("Opening tdbfile %s\n", tdbfile ));
 236
 237         /* Open idmap repository */
 238         if (!(idmap_tdb_common_ctx = tdb_open_log(tdbfile, 0, TDB_DEFAULT, O_RDWR | O_CREAT, 0644))) {
 239                 DEBUG(0, ("Unable to open idmap database\n"));
 240                 ret = NT_STATUS_UNSUCCESSFUL;
 241                 goto done;
 242         }
 243
 244         if (tdb_is_new) {
 245                 /* the file didn't existed before opening it, let's
 246                  * store idmap version as nobody else yet opened and
 247                  * stored it. I do not like this method but didn't
 248                  * found a way to understand if an opened tdb have
 249                  * been just created or not --- SSS */
 250                 tdb_store_int32(idmap_tdb_common_ctx, "IDMAP_VERSION", IDMAP_VERSION);
 251         }
 252
 253         /* check against earlier versions */
 254         version = tdb_fetch_int32(idmap_tdb_common_ctx, "IDMAP_VERSION");
 255         if (version != IDMAP_VERSION) {
 256
 257                 /* backup_tdb expects the tdb not to be open */
 258                 tdb_close(idmap_tdb_common_ctx);
 259
 260                 if ( ! idmap_tdb_upgrade(tdbfile)) {
 261
 262                         DEBUG(0, ("Unable to open idmap database, it's in an old formati, and upgrade failed!\n"));
 263                         ret = NT_STATUS_INTERNAL_DB_ERROR;
 264                         goto done;
 265                 }
 266
 267                 /* Re-Open idmap repository */
 268                 if (!(idmap_tdb_common_ctx = tdb_open_log(tdbfile, 0, TDB_DEFAULT, O_RDWR | O_CREAT, 0644))) {
 269                         DEBUG(0, ("Unable to open idmap database\n"));
 270                         ret = NT_STATUS_UNSUCCESSFUL;
 271                         goto done;
 272                 }
 273         }
 274
 275         *tdbctx = idmap_tdb_common_ctx;
 276         idmap_tdb_open_ref_count++;
 277         ret = NT_STATUS_OK;
 278
 279 done:
 280         talloc_free(ctx);
 281         return ret;
 282 }
 283
 284  /* NEVER use tdb_close() except for the conversion routines that are guaranteed
 285  * to run only when the database is opened the first time, always use this function. */
 286
 287 bool idmap_tdb_tdb_close(TDB_CONTEXT *tdbctx)
 288 {
 289         if (tdbctx != idmap_tdb_common_ctx) {
 290                 DEBUG(0, ("ERROR: Invalid tdb context!"));
 291                 return False;
 292         }
 293
 294         idmap_tdb_open_ref_count--;
 295         if (idmap_tdb_open_ref_count) {
 296                 return True;
 297         }
 298
 299         return tdb_close(idmap_tdb_common_ctx);
 300 }
 301
 302 /**********************************************************************
 303  IDMAP ALLOC TDB BACKEND
 304 **********************************************************************/
 305
 306 static TDB_CONTEXT *idmap_alloc_tdb;
 307
 308 /**********************************
 309  Initialise idmap alloc database.
 310 **********************************/
 311
 312 static NTSTATUS idmap_tdb_alloc_init( const char *params )
 313 {
 314         NTSTATUS ret;
 315         TALLOC_CTX *ctx;
 316         uid_t low_uid = 0;
 317         uid_t high_uid = 0;
 318         gid_t low_gid = 0;
 319         gid_t high_gid = 0;
 320         uint32_t low_id;
 321
 322         /* use our own context here */
 323         ctx = talloc_new(NULL);
 324         if (!ctx) {
 325                 DEBUG(0, ("Out of memory!\n"));
 326                 return NT_STATUS_NO_MEMORY;
 327         }
 328
 329         ret = idmap_tdb_open_db(ctx, &idmap_alloc_tdb);
 330         if ( ! NT_STATUS_IS_OK(ret)) {
 331                 talloc_free(ctx);
 332                 return ret;
 333         }
 334
 335         talloc_free(ctx);
 336
 337         /* load ranges */
 338
 339         if (!lp_idmap_uid(&low_uid, &high_uid)
 340             || !lp_idmap_gid(&low_gid, &high_gid)) {
 341                 DEBUG(1, ("idmap uid or idmap gid missing\n"));
 342                 return NT_STATUS_UNSUCCESSFUL;
 343         }
 344
 345         idmap_tdb_state.low_uid = low_uid;
 346         idmap_tdb_state.high_uid = high_uid;
 347         idmap_tdb_state.low_gid = low_gid;
 348         idmap_tdb_state.high_gid = high_gid;
 349
 350         if (idmap_tdb_state.high_uid <= idmap_tdb_state.low_uid) {
 351                 DEBUG(1, ("idmap uid range missing or invalid\n"));
 352                 DEBUGADD(1, ("idmap will be unable to map foreign SIDs\n"));
 353                 return NT_STATUS_UNSUCCESSFUL;
 354         }
 355
 356         if (idmap_tdb_state.high_gid <= idmap_tdb_state.low_gid) {
 357                 DEBUG(1, ("idmap gid range missing or invalid\n"));
 358                 DEBUGADD(1, ("idmap will be unable to map foreign SIDs\n"));
 359                 return NT_STATUS_UNSUCCESSFUL;
 360         }
 361
 362         if (((low_id = tdb_fetch_int32(idmap_alloc_tdb, HWM_USER)) == -1) ||
 363             (low_id < idmap_tdb_state.low_uid)) {
 364                 if (tdb_store_int32(idmap_alloc_tdb, HWM_USER,
 365                                     idmap_tdb_state.low_uid) == -1) {
 366                         DEBUG(0, ("Unable to initialise user hwm in idmap "
 367                                   "database\n"));
 368                         return NT_STATUS_INTERNAL_DB_ERROR;
 369                 }
 370         }
 371
 372         if (((low_id = tdb_fetch_int32(idmap_alloc_tdb, HWM_GROUP)) == -1) ||
 373             (low_id < idmap_tdb_state.low_gid)) {
 374                 if (tdb_store_int32(idmap_alloc_tdb, HWM_GROUP,
 375                                     idmap_tdb_state.low_gid) == -1) {
 376                         DEBUG(0, ("Unable to initialise group hwm in idmap "
 377                                   "database\n"));
 378                         return NT_STATUS_INTERNAL_DB_ERROR;
 379                 }
 380         }
 381
 382         return NT_STATUS_OK;
 383 }
 384
 385 /**********************************
 386  Allocate a new id.
 387 **********************************/
 388
 389 static NTSTATUS idmap_tdb_allocate_id(struct unixid *xid)
 390 {
 391         bool ret;
 392         const char *hwmkey;
 393         const char *hwmtype;
 394         uint32_t high_hwm;
 395         uint32_t hwm;
 396
 397         /* Get current high water mark */
 398         switch (xid->type) {
 399
 400         case ID_TYPE_UID:
 401                 hwmkey = HWM_USER;
 402                 hwmtype = "UID";
 403                 high_hwm = idmap_tdb_state.high_uid;
 404                 break;
 405
 406         case ID_TYPE_GID:
 407                 hwmkey = HWM_GROUP;
 408                 hwmtype = "GID";
 409                 high_hwm = idmap_tdb_state.high_gid;
 410                 break;
 411
 412         default:
 413                 DEBUG(2, ("Invalid ID type (0x%x)\n", xid->type));
 414                 return NT_STATUS_INVALID_PARAMETER;
 415         }
 416
 417         if ((hwm = tdb_fetch_int32(idmap_alloc_tdb, hwmkey)) == -1) {
 418                 return NT_STATUS_INTERNAL_DB_ERROR;
 419         }
 420
 421         /* check it is in the range */
 422         if (hwm > high_hwm) {
 423                 DEBUG(1, ("Fatal Error: %s range full!! (max: %lu)\n",
 424                           hwmtype, (unsigned long)high_hwm));
 425                 return NT_STATUS_UNSUCCESSFUL;
 426         }
 427
 428         /* fetch a new id and increment it */
 429         ret = tdb_change_uint32_atomic(idmap_alloc_tdb, hwmkey, &hwm, 1);
 430         if (!ret) {
 431                 DEBUG(1, ("Fatal error while fetching a new %s value\n!", hwmtype));
 432                 return NT_STATUS_UNSUCCESSFUL;
 433         }
 434
 435         /* recheck it is in the range */
 436         if (hwm > high_hwm) {
 437                 DEBUG(1, ("Fatal Error: %s range full!! (max: %lu)\n",
 438                           hwmtype, (unsigned long)high_hwm));
 439                 return NT_STATUS_UNSUCCESSFUL;
 440         }
 441
 442         xid->id = hwm;
 443         DEBUG(10,("New %s = %d\n", hwmtype, hwm));
 444
 445         return NT_STATUS_OK;
 446 }
 447
 448 /**********************************
 449  Get current highest id.
 450 **********************************/
 451
 452 static NTSTATUS idmap_tdb_get_hwm(struct unixid *xid)
 453 {
 454         const char *hwmkey;
 455         const char *hwmtype;
 456         uint32_t hwm;
 457         uint32_t high_hwm;
 458
 459         /* Get current high water mark */
 460         switch (xid->type) {
 461
 462         case ID_TYPE_UID:
 463                 hwmkey = HWM_USER;
 464                 hwmtype = "UID";
 465                 high_hwm = idmap_tdb_state.high_uid;
 466                 break;
 467
 468         case ID_TYPE_GID:
 469                 hwmkey = HWM_GROUP;
 470                 hwmtype = "GID";
 471                 high_hwm = idmap_tdb_state.high_gid;
 472                 break;
 473
 474         default:
 475                 return NT_STATUS_INVALID_PARAMETER;
 476         }
 477
 478         if ((hwm = tdb_fetch_int32(idmap_alloc_tdb, hwmkey)) == -1) {
 479                 return NT_STATUS_INTERNAL_DB_ERROR;
 480         }
 481
 482         xid->id = hwm;
 483
 484         /* Warn if it is out of range */
 485         if (hwm >= high_hwm) {
 486                 DEBUG(0, ("Warning: %s range full!! (max: %lu)\n",
 487                           hwmtype, (unsigned long)high_hwm));
 488         }
 489
 490         return NT_STATUS_OK;
 491 }
 492
 493 /**********************************
 494  Set high id.
 495 **********************************/
 496
 497 static NTSTATUS idmap_tdb_set_hwm(struct unixid *xid)
 498 {
 499         const char *hwmkey;
 500         const char *hwmtype;
 501         uint32_t hwm;
 502         uint32_t high_hwm;
 503
 504         /* Get current high water mark */
 505         switch (xid->type) {
 506
 507         case ID_TYPE_UID:
 508                 hwmkey = HWM_USER;
 509                 hwmtype = "UID";
 510                 high_hwm = idmap_tdb_state.high_uid;
 511                 break;
 512
 513         case ID_TYPE_GID:
 514                 hwmkey = HWM_GROUP;
 515                 hwmtype = "GID";
 516                 high_hwm = idmap_tdb_state.high_gid;
 517                 break;
 518
 519         default:
 520                 return NT_STATUS_INVALID_PARAMETER;
 521         }
 522
 523         hwm = xid->id;
 524
 525         if ((hwm = tdb_store_int32(idmap_alloc_tdb, hwmkey, hwm)) == -1) {
 526                 return NT_STATUS_INTERNAL_DB_ERROR;
 527         }
 528
 529         /* Warn if it is out of range */
 530         if (hwm >= high_hwm) {
 531                 DEBUG(0, ("Warning: %s range full!! (max: %lu)\n",
 532                           hwmtype, (unsigned long)high_hwm));
 533         }
 534
 535         return NT_STATUS_OK;
 536 }
 537
 538 /**********************************
 539  Close the alloc tdb
 540 **********************************/
 541
 542 static NTSTATUS idmap_tdb_alloc_close(void)
 543 {
 544         if (idmap_alloc_tdb) {
 545                 if (idmap_tdb_tdb_close(idmap_alloc_tdb) == 0) {
 546                         return NT_STATUS_OK;
 547                 } else {
 548                         return NT_STATUS_UNSUCCESSFUL;
 549                 }
 550         }
 551         return NT_STATUS_OK;
 552 }
 553
 554 /**********************************************************************
 555  IDMAP MAPPING TDB BACKEND
 556 **********************************************************************/
 557
 558 struct idmap_tdb_context {
 559         TDB_CONTEXT *tdb;
 560         uint32_t filter_low_id;
 561         uint32_t filter_high_id;
 562 };
 563
 564 /*****************************
 565  Initialise idmap database.
 566 *****************************/
 567
 568 static NTSTATUS idmap_tdb_db_init(struct idmap_domain *dom, const char *params)
 569 {
 570         NTSTATUS ret;
 571         struct idmap_tdb_context *ctx;
 572         char *config_option = NULL;
 573         const char *range;
 574
 575         ctx = talloc(dom, struct idmap_tdb_context);
 576         if ( ! ctx) {
 577                 DEBUG(0, ("Out of memory!\n"));
 578                 return NT_STATUS_NO_MEMORY;
 579         }
 580
 581         config_option = talloc_asprintf(ctx, "idmap config %s", dom->name);
 582         if ( ! config_option) {
 583                 DEBUG(0, ("Out of memory!\n"));
 584                 ret = NT_STATUS_NO_MEMORY;
 585                 goto failed;
 586         }
 587
 588         ret = idmap_tdb_open_db(ctx, &ctx->tdb);
 589         if ( ! NT_STATUS_IS_OK(ret)) {
 590                 goto failed;
 591         }
 592
 593         range = lp_parm_const_string(-1, config_option, "range", NULL);
 594         if (( ! range) ||
 595             (sscanf(range, "%u - %u", &ctx->filter_low_id, &ctx->filter_high_id) != 2) ||
 596             (ctx->filter_low_id > ctx->filter_high_id)) {
 597                 ctx->filter_low_id = 0;
 598                 ctx->filter_high_id = 0;
 599         }
 600
 601         dom->private_data = ctx;
 602
 603         talloc_free(config_option);
 604         return NT_STATUS_OK;
 605
 606 failed:
 607         talloc_free(ctx);
 608         return ret;
 609 }
 610
 611 /**********************************
 612  Single id to sid lookup function.
 613 **********************************/
 614
 615 static NTSTATUS idmap_tdb_id_to_sid(struct idmap_tdb_context *ctx, struct id_map *map)
 616 {
 617         NTSTATUS ret;
 618         TDB_DATA data;
 619         char *keystr;
 620
 621         if (!ctx || !map) {
 622                 return NT_STATUS_INVALID_PARAMETER;
 623         }
 624
 625         /* apply filters before checking */
 626         if ((ctx->filter_low_id && (map->xid.id < ctx->filter_low_id)) ||
 627             (ctx->filter_high_id && (map->xid.id > ctx->filter_high_id))) {
 628                 DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
 629                                 map->xid.id, ctx->filter_low_id, ctx->filter_high_id));
 630                 return NT_STATUS_NONE_MAPPED;
 631         }
 632
 633         switch (map->xid.type) {
 634
 635         case ID_TYPE_UID:
 636                 keystr = talloc_asprintf(ctx, "UID %lu", (unsigned long)map->xid.id);
 637                 break;
 638
 639         case ID_TYPE_GID:
 640                 keystr = talloc_asprintf(ctx, "GID %lu", (unsigned long)map->xid.id);
 641                 break;
 642
 643         default:
 644                 DEBUG(2, ("INVALID unix ID type: 0x02%x\n", map->xid.type));
 645                 return NT_STATUS_INVALID_PARAMETER;
 646         }
 647
 648         /* final SAFE_FREE safe */
 649         data.dptr = NULL;
 650
 651         if (keystr == NULL) {
 652                 DEBUG(0, ("Out of memory!\n"));
 653                 ret = NT_STATUS_NO_MEMORY;
 654                 goto done;
 655         }
 656
 657         DEBUG(10,("Fetching record %s\n", keystr));
 658
 659         /* Check if the mapping exists */
 660         data = tdb_fetch_bystring(ctx->tdb, keystr);
 661
 662         if (!data.dptr) {
 663                 DEBUG(10,("Record %s not found\n", keystr));
 664                 ret = NT_STATUS_NONE_MAPPED;
 665                 goto done;
 666         }
 667
 668         if (!string_to_sid(map->sid, (const char *)data.dptr)) {
 669                 DEBUG(10,("INVALID SID (%s) in record %s\n",
 670                         (const char *)data.dptr, keystr));
 671                 ret = NT_STATUS_INTERNAL_DB_ERROR;
 672                 goto done;
 673         }
 674
 675         DEBUG(10,("Found record %s -> %s\n", keystr, (const char *)data.dptr));
 676         ret = NT_STATUS_OK;
 677
 678 done:
 679         SAFE_FREE(data.dptr);
 680         talloc_free(keystr);
 681         return ret;
 682 }
 683
 684 /**********************************
 685  Single sid to id lookup function.
 686 **********************************/
 687
 688 static NTSTATUS idmap_tdb_sid_to_id(struct idmap_tdb_context *ctx, struct id_map *map)
 689 {
 690         NTSTATUS ret;
 691         TDB_DATA data;
 692         char *keystr;
 693         unsigned long rec_id = 0;
 694         fstring tmp;
 695
 696         if ((keystr = talloc_asprintf(
 697                      ctx, "%s", sid_to_fstring(tmp, map->sid))) == NULL) {
 698                 DEBUG(0, ("Out of memory!\n"));
 699                 ret = NT_STATUS_NO_MEMORY;
 700                 goto done;
 701         }
 702
 703         DEBUG(10,("Fetching record %s\n", keystr));
 704
 705         /* Check if sid is present in database */
 706         data = tdb_fetch_bystring(ctx->tdb, keystr);
 707         if (!data.dptr) {
 708                 DEBUG(10,("Record %s not found\n", keystr));
 709                 ret = NT_STATUS_NONE_MAPPED;
 710                 goto done;
 711         }
 712
 713         /* What type of record is this ? */
 714         if (sscanf((const char *)data.dptr, "UID %lu", &rec_id) == 1) { /* Try a UID record. */
 715                 map->xid.id = rec_id;
 716                 map->xid.type = ID_TYPE_UID;
 717                 DEBUG(10,("Found uid record %s -> %s \n", keystr, (const char *)data.dptr ));
 718                 ret = NT_STATUS_OK;
 719
 720         } else if (sscanf((const char *)data.dptr, "GID %lu", &rec_id) == 1) { /* Try a GID record. */
 721                 map->xid.id = rec_id;
 722                 map->xid.type = ID_TYPE_GID;
 723                 DEBUG(10,("Found gid record %s -> %s \n", keystr, (const char *)data.dptr ));
 724                 ret = NT_STATUS_OK;
 725
 726         } else { /* Unknown record type ! */
 727                 DEBUG(2, ("Found INVALID record %s -> %s\n", keystr, (const char *)data.dptr));
 728                 ret = NT_STATUS_INTERNAL_DB_ERROR;
 729         }
 730
 731         SAFE_FREE(data.dptr);
 732
 733         /* apply filters before returning result */
 734         if ((ctx->filter_low_id && (map->xid.id < ctx->filter_low_id)) ||
 735             (ctx->filter_high_id && (map->xid.id > ctx->filter_high_id))) {
 736                 DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
 737                                 map->xid.id, ctx->filter_low_id, ctx->filter_high_id));
 738                 ret = NT_STATUS_NONE_MAPPED;
 739         }
 740
 741 done:
 742         talloc_free(keystr);
 743         return ret;
 744 }
 745
 746 /**********************************
 747  lookup a set of unix ids.
 748 **********************************/
 749
 750 static NTSTATUS idmap_tdb_unixids_to_sids(struct idmap_domain *dom, struct id_map **ids)
 751 {
 752         struct idmap_tdb_context *ctx;
 753         NTSTATUS ret;
 754         int i;
 755
 756         /* initialize the status to avoid suprise */
 757         for (i = 0; ids[i]; i++) {
 758                 ids[i]->status = ID_UNKNOWN;
 759         }
 760
 761         ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
 762
 763         for (i = 0; ids[i]; i++) {
 764                 ret = idmap_tdb_id_to_sid(ctx, ids[i]);
 765                 if ( ! NT_STATUS_IS_OK(ret)) {
 766
 767                         /* if it is just a failed mapping continue */
 768                         if (NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED)) {
 769
 770                                 /* make sure it is marked as unmapped */
 771                                 ids[i]->status = ID_UNMAPPED;
 772                                 continue;
 773                         }
 774
 775                         /* some fatal error occurred, return immediately */
 776                         goto done;
 777                 }
 778
 779                 /* all ok, id is mapped */
 780                 ids[i]->status = ID_MAPPED;
 781         }
 782
 783         ret = NT_STATUS_OK;
 784
 785 done:
 786         return ret;
 787 }
 788
 789 /**********************************
 790  lookup a set of sids.
 791 **********************************/
 792
 793 static NTSTATUS idmap_tdb_sids_to_unixids(struct idmap_domain *dom, struct id_map **ids)
 794 {
 795         struct idmap_tdb_context *ctx;
 796         NTSTATUS ret;
 797         int i;
 798
 799         /* initialize the status to avoid suprise */
 800         for (i = 0; ids[i]; i++) {
 801                 ids[i]->status = ID_UNKNOWN;
 802         }
 803
 804         ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
 805
 806         for (i = 0; ids[i]; i++) {
 807                 ret = idmap_tdb_sid_to_id(ctx, ids[i]);
 808                 if ( ! NT_STATUS_IS_OK(ret)) {
 809
 810                         /* if it is just a failed mapping continue */
 811                         if (NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED)) {
 812
 813                                 /* make sure it is marked as unmapped */
 814                                 ids[i]->status = ID_UNMAPPED;
 815                                 continue;
 816                         }
 817
 818                         /* some fatal error occurred, return immediately */
 819                         goto done;
 820                 }
 821
 822                 /* all ok, id is mapped */
 823                 ids[i]->status = ID_MAPPED;
 824         }
 825
 826         ret = NT_STATUS_OK;
 827
 828 done:
 829         return ret;
 830 }
 831
 832 /**********************************
 833  set a mapping.
 834 **********************************/
 835
 836 static NTSTATUS idmap_tdb_set_mapping(struct idmap_domain *dom,
 837                                       const struct id_map *map)
 838 {
 839         struct idmap_tdb_context *ctx;
 840         NTSTATUS ret;
 841         TDB_DATA ksid, kid, data;
 842         char *ksidstr, *kidstr;
 843         fstring tmp;
 844
 845         if (!map || !map->sid) {
 846                 return NT_STATUS_INVALID_PARAMETER;
 847         }
 848
 849         ksidstr = kidstr = NULL;
 850         data.dptr = NULL;
 851
 852         /* TODO: should we filter a set_mapping using low/high filters ? */
 853
 854         ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
 855
 856         switch (map->xid.type) {
 857
 858         case ID_TYPE_UID:
 859                 kidstr = talloc_asprintf(ctx, "UID %lu",
 860                                          (unsigned long)map->xid.id);
 861                 break;
 862
 863         case ID_TYPE_GID:
 864                 kidstr = talloc_asprintf(ctx, "GID %lu",
 865                                          (unsigned long)map->xid.id);
 866                 break;
 867
 868         default:
 869                 DEBUG(2, ("INVALID unix ID type: 0x02%x\n", map->xid.type));
 870                 return NT_STATUS_INVALID_PARAMETER;
 871         }
 872
 873         if (kidstr == NULL) {
 874                 DEBUG(0, ("ERROR: Out of memory!\n"));
 875                 ret = NT_STATUS_NO_MEMORY;
 876                 goto done;
 877         }
 878
 879         if ((ksidstr = talloc_asprintf(
 880                      ctx, "%s", sid_to_fstring(tmp, map->sid))) == NULL) {
 881                 DEBUG(0, ("Out of memory!\n"));
 882                 ret = NT_STATUS_NO_MEMORY;
 883                 goto done;
 884         }
 885
 886         DEBUG(10, ("Storing %s <-> %s map\n", ksidstr, kidstr));
 887         kid = string_term_tdb_data(kidstr);
 888         ksid = string_term_tdb_data(ksidstr);
 889
 890         /* *DELETE* previous mappings if any.
 891          * This is done for both the SID and [U|G]ID passed in */
 892
 893         /* NOTE: We should lock both the ksid and kid records here, before
 894          * making modifications.  However, because tdb_chainlock() is a
 895          * blocking call we could create an unrecoverable deadlock, so for now
 896          * we only lock the ksid record. */
 897
 898         /* Lock the record for this SID. */
 899         if (tdb_chainlock(ctx->tdb, ksid) != 0) {
 900                 DEBUG(10,("Failed to lock record %s. Error %s\n",
 901                                 ksidstr, tdb_errorstr(ctx->tdb) ));
 902                 return NT_STATUS_UNSUCCESSFUL;
 903         }
 904
 905         data = tdb_fetch(ctx->tdb, ksid);
 906         if (data.dptr) {
 907                 DEBUG(10, ("Deleting existing mapping %s <-> %s\n",
 908                            (const char *)data.dptr, ksidstr ));
 909                 tdb_delete(ctx->tdb, data);
 910                 tdb_delete(ctx->tdb, ksid);
 911                 SAFE_FREE(data.dptr);
 912         }
 913
 914         data = tdb_fetch(ctx->tdb, kid);
 915         if (data.dptr) {
 916                 DEBUG(10,("Deleting existing mapping %s <-> %s\n",
 917                           (const char *)data.dptr, kidstr ));
 918                 tdb_delete(ctx->tdb, data);
 919                 tdb_delete(ctx->tdb, kid);
 920                 SAFE_FREE(data.dptr);
 921         }
 922
 923         if (tdb_store(ctx->tdb, ksid, kid, TDB_INSERT) == -1) {
 924                 DEBUG(0, ("Error storing SID -> ID: %s\n",
 925                           tdb_errorstr(ctx->tdb)));
 926                 tdb_chainunlock(ctx->tdb, ksid);
 927                 ret = NT_STATUS_UNSUCCESSFUL;
 928                 goto done;
 929         }
 930         if (tdb_store(ctx->tdb, kid, ksid, TDB_INSERT) == -1) {
 931                 DEBUG(0, ("Error storing ID -> SID: %s\n",
 932                           tdb_errorstr(ctx->tdb)));
 933                 /* try to remove the previous stored SID -> ID map */
 934                 tdb_delete(ctx->tdb, ksid);
 935                 tdb_chainunlock(ctx->tdb, ksid);
 936                 ret = NT_STATUS_UNSUCCESSFUL;
 937                 goto done;
 938         }
 939
 940         tdb_chainunlock(ctx->tdb, ksid);
 941         DEBUG(10,("Stored %s <-> %s\n", ksidstr, kidstr));
 942         ret = NT_STATUS_OK;
 943
 944 done:
 945         talloc_free(ksidstr);
 946         talloc_free(kidstr);
 947         SAFE_FREE(data.dptr);
 948         return ret;
 949 }
 950
 951 /**********************************
 952  remove a mapping.
 953 **********************************/
 954
 955 static NTSTATUS idmap_tdb_remove_mapping(struct idmap_domain *dom,
 956                                          const struct id_map *map)
 957 {
 958         struct idmap_tdb_context *ctx;
 959         NTSTATUS ret;
 960         TDB_DATA ksid, kid, data;
 961         char *ksidstr, *kidstr;
 962         fstring tmp;
 963
 964         if (!map || !map->sid) {
 965                 return NT_STATUS_INVALID_PARAMETER;
 966         }
 967
 968         ksidstr = kidstr = NULL;
 969         data.dptr = NULL;
 970
 971         /* TODO: should we filter a remove_mapping using low/high filters ? */
 972
 973         ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
 974
 975         switch (map->xid.type) {
 976
 977         case ID_TYPE_UID:
 978                 kidstr = talloc_asprintf(ctx, "UID %lu",
 979                                          (unsigned long)map->xid.id);
 980                 break;
 981
 982         case ID_TYPE_GID:
 983                 kidstr = talloc_asprintf(ctx, "GID %lu",
 984                                          (unsigned long)map->xid.id);
 985                 break;
 986
 987         default:
 988                 DEBUG(2, ("INVALID unix ID type: 0x02%x\n", map->xid.type));
 989                 return NT_STATUS_INVALID_PARAMETER;
 990         }
 991
 992         if (kidstr == NULL) {
 993                 DEBUG(0, ("ERROR: Out of memory!\n"));
 994                 ret = NT_STATUS_NO_MEMORY;
 995                 goto done;
 996         }
 997
 998         if ((ksidstr = talloc_asprintf(
 999                      ctx, "%s", sid_to_fstring(tmp, map->sid))) == NULL) {
1000                 DEBUG(0, ("Out of memory!\n"));
1001                 ret = NT_STATUS_NO_MEMORY;
1002                 goto done;
1003         }
1004
1005         DEBUG(10, ("Checking %s <-> %s map\n", ksidstr, kidstr));
1006         ksid = string_term_tdb_data(ksidstr);
1007         kid = string_term_tdb_data(kidstr);
1008
1009         /* NOTE: We should lock both the ksid and kid records here, before
1010          * making modifications.  However, because tdb_chainlock() is a
1011          * blocking call we could create an unrecoverable deadlock, so for now
1012          * we only lock the ksid record. */
1013
1014         /* Lock the record for this SID. */
1015         if (tdb_chainlock(ctx->tdb, ksid) != 0) {
1016                 DEBUG(10,("Failed to lock record %s. Error %s\n",
1017                                 ksidstr, tdb_errorstr(ctx->tdb) ));
1018                 return NT_STATUS_UNSUCCESSFUL;
1019         }
1020
1021         /* Check if sid is present in database */
1022         data = tdb_fetch(ctx->tdb, ksid);
1023         if (!data.dptr) {
1024                 DEBUG(10,("Record %s not found\n", ksidstr));
1025                 tdb_chainunlock(ctx->tdb, ksid);
1026                 ret = NT_STATUS_NONE_MAPPED;
1027                 goto done;
1028         }
1029
1030         /* Check if sid is mapped to the specified ID */
1031         if ((data.dsize != kid.dsize) ||
1032             (memcmp(data.dptr, kid.dptr, data.dsize) != 0)) {
1033                 DEBUG(10,("Specified SID does not map to specified ID\n"));
1034                 DEBUGADD(10,("Actual mapping is %s -> %s\n", ksidstr,
1035                          (const char *)data.dptr));
1036                 tdb_chainunlock(ctx->tdb, ksid);
1037                 ret = NT_STATUS_NONE_MAPPED;
1038                 goto done;
1039         }
1040
1041         DEBUG(10, ("Removing %s <-> %s map\n", ksidstr, kidstr));
1042
1043         /* Delete previous mappings. */
1044
1045         DEBUG(10, ("Deleting existing mapping %s -> %s\n", ksidstr, kidstr ));
1046         tdb_delete(ctx->tdb, ksid);
1047
1048         DEBUG(10,("Deleting existing mapping %s -> %s\n", kidstr, ksidstr ));
1049         tdb_delete(ctx->tdb, kid);
1050
1051         tdb_chainunlock(ctx->tdb, ksid);
1052         ret = NT_STATUS_OK;
1053
1054 done:
1055         talloc_free(ksidstr);
1056         talloc_free(kidstr);
1057         SAFE_FREE(data.dptr);
1058         return ret;
1059 }
1060
1061 /**********************************
1062  Close the idmap tdb instance
1063 **********************************/
1064
1065 static NTSTATUS idmap_tdb_close(struct idmap_domain *dom)
1066 {
1067         struct idmap_tdb_context *ctx;
1068
1069         if (dom->private_data) {
1070                 ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
1071
1072                 if (idmap_tdb_tdb_close(ctx->tdb) == 0) {
1073                         return NT_STATUS_OK;
1074                 } else {
1075                         return NT_STATUS_UNSUCCESSFUL;
1076                 }
1077         }
1078         return NT_STATUS_OK;
1079 }
1080
1081 struct dump_data {
1082         TALLOC_CTX *memctx;
1083         struct id_map **maps;
1084         int *num_maps;
1085         NTSTATUS ret;
1086 };
1087
1088 static int idmap_tdb_dump_one_entry(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA value, void *pdata)
1089 {
1090         struct dump_data *data = talloc_get_type(pdata, struct dump_data);
1091         struct id_map *maps;
1092         int num_maps = *data->num_maps;
1093
1094         /* ignore any record but the ones with a SID as key */
1095         if (strncmp((const char *)key.dptr, "S-", 2) == 0) {
1096
1097                 maps = talloc_realloc(NULL, *data->maps, struct id_map, num_maps+1);
1098                 if ( ! maps) {
1099                         DEBUG(0, ("Out of memory!\n"));
1100                         data->ret = NT_STATUS_NO_MEMORY;
1101                         return -1;
1102                 }
1103                 *data->maps = maps;
1104                 maps[num_maps].sid = talloc(maps, DOM_SID);
1105                 if ( ! maps[num_maps].sid) {
1106                         DEBUG(0, ("Out of memory!\n"));
1107                         data->ret = NT_STATUS_NO_MEMORY;
1108                         return -1;
1109                 }
1110
1111                 if (!string_to_sid(maps[num_maps].sid, (const char *)key.dptr)) {
1112                         DEBUG(10,("INVALID record %s\n", (const char *)key.dptr));
1113                         /* continue even with errors */
1114                         return 0;
1115                 }
1116
1117                 /* Try a UID record. */
1118                 if (sscanf((const char *)value.dptr, "UID %u", &(maps[num_maps].xid.id)) == 1) {
1119                         maps[num_maps].xid.type = ID_TYPE_UID;
1120                         maps[num_maps].status = ID_MAPPED;
1121                         *data->num_maps = num_maps + 1;
1122
1123                 /* Try a GID record. */
1124                 } else
1125                 if (sscanf((const char *)value.dptr, "GID %u", &(maps[num_maps].xid.id)) == 1) {
1126                         maps[num_maps].xid.type = ID_TYPE_GID;
1127                         maps[num_maps].status = ID_MAPPED;
1128                         *data->num_maps = num_maps + 1;
1129
1130                 /* Unknown record type ! */
1131                 } else {
1132                         maps[num_maps].status = ID_UNKNOWN;
1133                         DEBUG(2, ("Found INVALID record %s -> %s\n",
1134                                 (const char *)key.dptr, (const char *)value.dptr));
1135                         /* do not increment num_maps */
1136                 }
1137         }
1138
1139         return 0;
1140 }
1141
1142 /**********************************
1143  Dump all mappings out
1144 **********************************/
1145
1146 static NTSTATUS idmap_tdb_dump_data(struct idmap_domain *dom, struct id_map **maps, int *num_maps)
1147 {
1148         struct idmap_tdb_context *ctx;
1149         struct dump_data *data;
1150         NTSTATUS ret = NT_STATUS_OK;
1151
1152         ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
1153
1154         data = TALLOC_ZERO_P(ctx, struct dump_data);
1155         if ( ! data) {
1156                 DEBUG(0, ("Out of memory!\n"));
1157                 return NT_STATUS_NO_MEMORY;
1158         }
1159         data->maps = maps;
1160         data->num_maps = num_maps;
1161         data->ret = NT_STATUS_OK;
1162
1163         tdb_traverse(ctx->tdb, idmap_tdb_dump_one_entry, data);
1164
1165         if ( ! NT_STATUS_IS_OK(data->ret)) {
1166                 ret = data->ret;
1167         }
1168
1169         talloc_free(data);
1170         return ret;
1171 }
1172
1173 static struct idmap_methods db_methods = {
1174
1175         .init = idmap_tdb_db_init,
1176         .unixids_to_sids = idmap_tdb_unixids_to_sids,
1177         .sids_to_unixids = idmap_tdb_sids_to_unixids,
1178         .set_mapping = idmap_tdb_set_mapping,
1179         .remove_mapping = idmap_tdb_remove_mapping,
1180         .dump_data = idmap_tdb_dump_data,
1181         .close_fn = idmap_tdb_close
1182 };
1183
1184 static struct idmap_alloc_methods db_alloc_methods = {
1185
1186         .init = idmap_tdb_alloc_init,
1187         .allocate_id = idmap_tdb_allocate_id,
1188         .get_id_hwm = idmap_tdb_get_hwm,
1189         .set_id_hwm = idmap_tdb_set_hwm,
1190         .close_fn = idmap_tdb_alloc_close
1191 };
1192
1193 NTSTATUS idmap_alloc_tdb_init(void)
1194 {
1195         return smb_register_idmap_alloc(SMB_IDMAP_INTERFACE_VERSION, "tdb", &db_alloc_methods);
1196 }
1197
1198 NTSTATUS idmap_tdb_init(void)
1199 {
1200         NTSTATUS ret;
1201
1202         DEBUG(10, ("calling idmap_tdb_init\n"));
1203
1204         /* FIXME: bad hack to actually register also the alloc_tdb module without changining configure.in */
1205         ret = idmap_alloc_tdb_init();
1206         if (! NT_STATUS_IS_OK(ret)) {
1207                 return ret;
1208         }
1209         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "tdb", &db_methods);
1210 }