source3/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 /* idmap version determines auto-conversion - this is the database
  32    structure version specifier. */
  33
  34 #define IDMAP_VERSION 2
  35
  36 /* High water mark keys */
  37 #define HWM_GROUP  "GROUP HWM"
  38 #define HWM_USER   "USER HWM"
  39
  40 static struct idmap_tdb_state {
  41
  42         /* User and group id pool */
  43         uid_t low_uid, high_uid;               /* Range of uids to allocate */
  44         gid_t low_gid, high_gid;               /* Range of gids to allocate */
  45
  46 } idmap_tdb_state;
  47
  48 struct convert_fn_state {
  49         struct db_context *db;
  50         bool failed;
  51 };
  52
  53 /*****************************************************************************
  54  For idmap conversion: convert one record to new format
  55  Ancient versions (eg 2.2.3a) of winbindd_idmap.tdb mapped DOMAINNAME/rid
  56  instead of the SID.
  57 *****************************************************************************/
  58 static int convert_fn(struct db_record *rec, void *private_data)
  59 {
  60         struct winbindd_domain *domain;
  61         char *p;
  62         NTSTATUS status;
  63         DOM_SID sid;
  64         uint32 rid;
  65         fstring keystr;
  66         fstring dom_name;
  67         TDB_DATA key2;
  68         struct convert_fn_state *s = (struct convert_fn_state *)private_data;
  69
  70         DEBUG(10,("Converting %s\n", (const char *)rec->key.dptr));
  71
  72         p = strchr((const char *)rec->key.dptr, '/');
  73         if (!p)
  74                 return 0;
  75
  76         *p = 0;
  77         fstrcpy(dom_name, (const char *)rec->key.dptr);
  78         *p++ = '/';
  79
  80         domain = find_domain_from_name(dom_name);
  81         if (domain == NULL) {
  82                 /* We must delete the old record. */
  83                 DEBUG(0,("Unable to find domain %s\n", dom_name ));
  84                 DEBUG(0,("deleting record %s\n", (const char *)rec->key.dptr ));
  85
  86                 status = rec->delete_rec(rec);
  87                 if (!NT_STATUS_IS_OK(status)) {
  88                         DEBUG(0, ("Unable to delete record %s:%s\n",
  89                                 (const char *)rec->key.dptr,
  90                                 nt_errstr(status)));
  91                         s->failed = true;
  92                         return -1;
  93                 }
  94
  95                 return 0;
  96         }
  97
  98         rid = atoi(p);
  99
 100         sid_compose(&sid, &domain->sid, rid);
 101
 102         sid_to_fstring(keystr, &sid);
 103         key2 = string_term_tdb_data(keystr);
 104
 105         status = dbwrap_store(s->db, key2, rec->value, TDB_INSERT);
 106         if (!NT_STATUS_IS_OK(status)) {
 107                 DEBUG(0,("Unable to add record %s:%s\n",
 108                         (const char *)key2.dptr,
 109                         nt_errstr(status)));
 110                 s->failed = true;
 111                 return -1;
 112         }
 113
 114         status = dbwrap_store(s->db, rec->value, key2, TDB_REPLACE);
 115         if (!NT_STATUS_IS_OK(status)) {
 116                 DEBUG(0,("Unable to update record %s:%s\n",
 117                         (const char *)rec->value.dptr,
 118                         nt_errstr(status)));
 119                 s->failed = true;
 120                 return -1;
 121         }
 122
 123         status = rec->delete_rec(rec);
 124         if (!NT_STATUS_IS_OK(status)) {
 125                 DEBUG(0,("Unable to delete record %s:%s\n",
 126                         (const char *)rec->key.dptr,
 127                         nt_errstr(status)));
 128                 s->failed = true;
 129                 return -1;
 130         }
 131
 132         return 0;
 133 }
 134
 135 /*****************************************************************************
 136  Convert the idmap database from an older version.
 137 *****************************************************************************/
 138
 139 static bool idmap_tdb_upgrade(struct db_context *db)
 140 {
 141         int32 vers;
 142         bool bigendianheader;
 143         struct convert_fn_state s;
 144
 145         DEBUG(0, ("Upgrading winbindd_idmap.tdb from an old version\n"));
 146
 147         bigendianheader = (db->get_flags(db) & TDB_BIGENDIAN) ? True : False;
 148
 149         vers = dbwrap_fetch_int32(db, "IDMAP_VERSION");
 150
 151         if (((vers == -1) && bigendianheader) || (IREV(vers) == IDMAP_VERSION)) {
 152                 /* Arrggghh ! Bytereversed or old big-endian - make order independent ! */
 153                 /*
 154                  * high and low records were created on a
 155                  * big endian machine and will need byte-reversing.
 156                  */
 157
 158                 int32 wm;
 159
 160                 wm = dbwrap_fetch_int32(db, HWM_USER);
 161
 162                 if (wm != -1) {
 163                         wm = IREV(wm);
 164                 }  else {
 165                         wm = idmap_tdb_state.low_uid;
 166                 }
 167
 168                 if (dbwrap_store_int32(db, HWM_USER, wm) == -1) {
 169                         DEBUG(0, ("Unable to byteswap user hwm in idmap database\n"));
 170                         return False;
 171                 }
 172
 173                 wm = dbwrap_fetch_int32(db, HWM_GROUP);
 174                 if (wm != -1) {
 175                         wm = IREV(wm);
 176                 } else {
 177                         wm = idmap_tdb_state.low_gid;
 178                 }
 179
 180                 if (dbwrap_store_int32(db, HWM_GROUP, wm) == -1) {
 181                         DEBUG(0, ("Unable to byteswap group hwm in idmap database\n"));
 182                         return False;
 183                 }
 184         }
 185
 186         s.db = db;
 187         s.failed = false;
 188
 189         /* the old format stored as DOMAIN/rid - now we store the SID direct */
 190         db->traverse(db, convert_fn, &s);
 191
 192         if (s.failed) {
 193                 DEBUG(0, ("Problem during conversion\n"));
 194                 return False;
 195         }
 196
 197         if (dbwrap_store_int32(db, "IDMAP_VERSION", IDMAP_VERSION) == -1) {
 198                 DEBUG(0, ("Unable to store idmap version in databse\n"));
 199                 return False;
 200         }
 201
 202         return True;
 203 }
 204
 205 static NTSTATUS idmap_tdb_load_ranges(void)
 206 {
 207         uid_t low_uid = 0;
 208         uid_t high_uid = 0;
 209         gid_t low_gid = 0;
 210         gid_t high_gid = 0;
 211
 212         if (!lp_idmap_uid(&low_uid, &high_uid)) {
 213                 DEBUG(1, ("idmap uid missing\n"));
 214                 return NT_STATUS_UNSUCCESSFUL;
 215         }
 216
 217         if (!lp_idmap_gid(&low_gid, &high_gid)) {
 218                 DEBUG(1, ("idmap gid missing\n"));
 219                 return NT_STATUS_UNSUCCESSFUL;
 220         }
 221
 222         idmap_tdb_state.low_uid = low_uid;
 223         idmap_tdb_state.high_uid = high_uid;
 224         idmap_tdb_state.low_gid = low_gid;
 225         idmap_tdb_state.high_gid = high_gid;
 226
 227         if (idmap_tdb_state.high_uid <= idmap_tdb_state.low_uid) {
 228                 DEBUG(1, ("idmap uid range missing or invalid\n"));
 229                 return NT_STATUS_UNSUCCESSFUL;
 230         }
 231
 232         if (idmap_tdb_state.high_gid <= idmap_tdb_state.low_gid) {
 233                 DEBUG(1, ("idmap gid range missing or invalid\n"));
 234                 return NT_STATUS_UNSUCCESSFUL;
 235         }
 236
 237         return NT_STATUS_OK;
 238 }
 239
 240 static NTSTATUS idmap_tdb_open_db(TALLOC_CTX *memctx,
 241                                   bool check_config,
 242                                   struct db_context **dbctx)
 243 {
 244         NTSTATUS ret;
 245         TALLOC_CTX *ctx;
 246         char *tdbfile = NULL;
 247         struct db_context *db = NULL;
 248         int32_t version;
 249         bool config_error = false;
 250
 251         ret = idmap_tdb_load_ranges();
 252         if (!NT_STATUS_IS_OK(ret)) {
 253                 config_error = true;
 254                 if (check_config) {
 255                         return ret;
 256                 }
 257         }
 258
 259         /* use our own context here */
 260         ctx = talloc_stackframe();
 261
 262         /* use the old database if present */
 263         tdbfile = state_path("winbindd_idmap.tdb");
 264         if (!tdbfile) {
 265                 DEBUG(0, ("Out of memory!\n"));
 266                 ret = NT_STATUS_NO_MEMORY;
 267                 goto done;
 268         }
 269
 270         DEBUG(10,("Opening tdbfile %s\n", tdbfile ));
 271
 272         /* Open idmap repository */
 273         db = db_open(ctx, tdbfile, 0, TDB_DEFAULT, O_RDWR | O_CREAT, 0644);
 274         if (!db) {
 275                 DEBUG(0, ("Unable to open idmap database\n"));
 276                 ret = NT_STATUS_UNSUCCESSFUL;
 277                 goto done;
 278         }
 279
 280         /* check against earlier versions */
 281         version = dbwrap_fetch_int32(db, "IDMAP_VERSION");
 282         if (version != IDMAP_VERSION) {
 283                 if (config_error) {
 284                         DEBUG(0,("Upgrade of IDMAP_VERSION from %d to %d is not "
 285                                  "possible with incomplete configuration\n",
 286                                  version, IDMAP_VERSION));
 287                         ret = NT_STATUS_UNSUCCESSFUL;
 288                         goto done;
 289                 }
 290                 if (db->transaction_start(db) != 0) {
 291                         DEBUG(0, ("Unable to start upgrade transaction!\n"));
 292                         ret = NT_STATUS_INTERNAL_DB_ERROR;
 293                         goto done;
 294                 }
 295
 296                 if (!idmap_tdb_upgrade(db)) {
 297                         db->transaction_cancel(db);
 298                         DEBUG(0, ("Unable to open idmap database, it's in an old format, and upgrade failed!\n"));
 299                         ret = NT_STATUS_INTERNAL_DB_ERROR;
 300                         goto done;
 301                 }
 302
 303                 if (db->transaction_commit(db) != 0) {
 304                         DEBUG(0, ("Unable to commit upgrade transaction!\n"));
 305                         ret = NT_STATUS_INTERNAL_DB_ERROR;
 306                         goto done;
 307                 }
 308         }
 309
 310         *dbctx = talloc_move(memctx, &db);
 311         ret = NT_STATUS_OK;
 312
 313 done:
 314         talloc_free(ctx);
 315         return ret;
 316 }
 317
 318 /**********************************************************************
 319  IDMAP ALLOC TDB BACKEND
 320 **********************************************************************/
 321
 322 static struct db_context *idmap_alloc_db;
 323
 324 /**********************************
 325  Initialise idmap alloc database.
 326 **********************************/
 327
 328 static NTSTATUS idmap_tdb_alloc_init( const char *params )
 329 {
 330         int ret;
 331         NTSTATUS status;
 332         uint32_t low_uid;
 333         uint32_t low_gid;
 334         bool update_uid = false;
 335         bool update_gid = false;
 336
 337         status = idmap_tdb_open_db(NULL, true, &idmap_alloc_db);
 338         if (!NT_STATUS_IS_OK(status)) {
 339                 DEBUG(0, ("idmap will be unable to map foreign SIDs: %s\n",
 340                           nt_errstr(status)));
 341                 return status;
 342         }
 343
 344         low_uid = dbwrap_fetch_int32(idmap_alloc_db, HWM_USER);
 345         if (low_uid == -1 || low_uid < idmap_tdb_state.low_uid) {
 346                 update_uid = true;
 347         }
 348
 349         low_gid = dbwrap_fetch_int32(idmap_alloc_db, HWM_GROUP);
 350         if (low_gid == -1 || low_gid < idmap_tdb_state.low_gid) {
 351                 update_gid = true;
 352         }
 353
 354         if (!update_uid && !update_gid) {
 355                 return NT_STATUS_OK;
 356         }
 357
 358         if (idmap_alloc_db->transaction_start(idmap_alloc_db) != 0) {
 359                 TALLOC_FREE(idmap_alloc_db);
 360                 DEBUG(0, ("Unable to start upgrade transaction!\n"));
 361                 return NT_STATUS_INTERNAL_DB_ERROR;
 362         }
 363
 364         if (update_uid) {
 365                 ret = dbwrap_store_int32(idmap_alloc_db, HWM_USER,
 366                                          idmap_tdb_state.low_uid);
 367                 if (ret == -1) {
 368                         idmap_alloc_db->transaction_cancel(idmap_alloc_db);
 369                         TALLOC_FREE(idmap_alloc_db);
 370                         DEBUG(0, ("Unable to initialise user hwm in idmap "
 371                                   "database\n"));
 372                         return NT_STATUS_INTERNAL_DB_ERROR;
 373                 }
 374         }
 375
 376         if (update_gid) {
 377                 ret = dbwrap_store_int32(idmap_alloc_db, HWM_GROUP,
 378                                          idmap_tdb_state.low_gid);
 379                 if (ret == -1) {
 380                         idmap_alloc_db->transaction_cancel(idmap_alloc_db);
 381                         TALLOC_FREE(idmap_alloc_db);
 382                         DEBUG(0, ("Unable to initialise group hwm in idmap "
 383                                   "database\n"));
 384                         return NT_STATUS_INTERNAL_DB_ERROR;
 385                 }
 386         }
 387
 388         if (idmap_alloc_db->transaction_commit(idmap_alloc_db) != 0) {
 389                 TALLOC_FREE(idmap_alloc_db);
 390                 DEBUG(0, ("Unable to commit upgrade transaction!\n"));
 391                 return NT_STATUS_INTERNAL_DB_ERROR;
 392         }
 393
 394         return NT_STATUS_OK;
 395 }
 396
 397 /**********************************
 398  Allocate a new id.
 399 **********************************/
 400
 401 static NTSTATUS idmap_tdb_allocate_id(struct unixid *xid)
 402 {
 403         NTSTATUS ret;
 404         const char *hwmkey;
 405         const char *hwmtype;
 406         uint32_t high_hwm;
 407         uint32_t hwm;
 408         int res;
 409
 410         /* Get current high water mark */
 411         switch (xid->type) {
 412
 413         case ID_TYPE_UID:
 414                 hwmkey = HWM_USER;
 415                 hwmtype = "UID";
 416                 high_hwm = idmap_tdb_state.high_uid;
 417                 break;
 418
 419         case ID_TYPE_GID:
 420                 hwmkey = HWM_GROUP;
 421                 hwmtype = "GID";
 422                 high_hwm = idmap_tdb_state.high_gid;
 423                 break;
 424
 425         default:
 426                 DEBUG(2, ("Invalid ID type (0x%x)\n", xid->type));
 427                 return NT_STATUS_INVALID_PARAMETER;
 428         }
 429
 430         res = idmap_alloc_db->transaction_start(idmap_alloc_db);
 431         if (res != 0) {
 432                 DEBUG(1, (__location__ " Failed to start transaction.\n"));
 433                 return NT_STATUS_UNSUCCESSFUL;
 434         }
 435
 436         if ((hwm = dbwrap_fetch_int32(idmap_alloc_db, hwmkey)) == -1) {
 437                 idmap_alloc_db->transaction_cancel(idmap_alloc_db);
 438                 return NT_STATUS_INTERNAL_DB_ERROR;
 439         }
 440
 441         /* check it is in the range */
 442         if (hwm > high_hwm) {
 443                 DEBUG(1, ("Fatal Error: %s range full!! (max: %lu)\n",
 444                           hwmtype, (unsigned long)high_hwm));
 445                 idmap_alloc_db->transaction_cancel(idmap_alloc_db);
 446                 return NT_STATUS_UNSUCCESSFUL;
 447         }
 448
 449         /* fetch a new id and increment it */
 450         ret = dbwrap_change_uint32_atomic(idmap_alloc_db, hwmkey, &hwm, 1);
 451         if (!NT_STATUS_IS_OK(ret)) {
 452                 DEBUG(0, ("Fatal error while fetching a new %s value: %s\n!",
 453                           hwmtype, nt_errstr(ret)));
 454                 idmap_alloc_db->transaction_cancel(idmap_alloc_db);
 455                 return ret;
 456         }
 457
 458         /* recheck it is in the range */
 459         if (hwm > high_hwm) {
 460                 DEBUG(1, ("Fatal Error: %s range full!! (max: %lu)\n",
 461                           hwmtype, (unsigned long)high_hwm));
 462                 idmap_alloc_db->transaction_cancel(idmap_alloc_db);
 463                 return NT_STATUS_UNSUCCESSFUL;
 464         }
 465
 466         res = idmap_alloc_db->transaction_commit(idmap_alloc_db);
 467         if (res != 0) {
 468                 DEBUG(1, (__location__ " Failed to commit transaction.\n"));
 469                 return NT_STATUS_UNSUCCESSFUL;
 470         }
 471
 472         xid->id = hwm;
 473         DEBUG(10,("New %s = %d\n", hwmtype, hwm));
 474
 475         return NT_STATUS_OK;
 476 }
 477
 478 /**********************************
 479  Get current highest id.
 480 **********************************/
 481
 482 static NTSTATUS idmap_tdb_get_hwm(struct unixid *xid)
 483 {
 484         const char *hwmkey;
 485         const char *hwmtype;
 486         uint32_t hwm;
 487         uint32_t high_hwm;
 488
 489         /* Get current high water mark */
 490         switch (xid->type) {
 491
 492         case ID_TYPE_UID:
 493                 hwmkey = HWM_USER;
 494                 hwmtype = "UID";
 495                 high_hwm = idmap_tdb_state.high_uid;
 496                 break;
 497
 498         case ID_TYPE_GID:
 499                 hwmkey = HWM_GROUP;
 500                 hwmtype = "GID";
 501                 high_hwm = idmap_tdb_state.high_gid;
 502                 break;
 503
 504         default:
 505                 return NT_STATUS_INVALID_PARAMETER;
 506         }
 507
 508         if ((hwm = dbwrap_fetch_int32(idmap_alloc_db, hwmkey)) == -1) {
 509                 return NT_STATUS_INTERNAL_DB_ERROR;
 510         }
 511
 512         xid->id = hwm;
 513
 514         /* Warn if it is out of range */
 515         if (hwm >= high_hwm) {
 516                 DEBUG(0, ("Warning: %s range full!! (max: %lu)\n",
 517                           hwmtype, (unsigned long)high_hwm));
 518         }
 519
 520         return NT_STATUS_OK;
 521 }
 522
 523 /**********************************
 524  Set high id.
 525 **********************************/
 526
 527 static NTSTATUS idmap_tdb_set_hwm(struct unixid *xid)
 528 {
 529         const char *hwmkey;
 530         const char *hwmtype;
 531         uint32_t hwm;
 532         uint32_t high_hwm;
 533         NTSTATUS ret;
 534
 535         /* Get current high water mark */
 536         switch (xid->type) {
 537
 538         case ID_TYPE_UID:
 539                 hwmkey = HWM_USER;
 540                 hwmtype = "UID";
 541                 high_hwm = idmap_tdb_state.high_uid;
 542                 break;
 543
 544         case ID_TYPE_GID:
 545                 hwmkey = HWM_GROUP;
 546                 hwmtype = "GID";
 547                 high_hwm = idmap_tdb_state.high_gid;
 548                 break;
 549
 550         default:
 551                 return NT_STATUS_INVALID_PARAMETER;
 552         }
 553
 554         hwm = xid->id;
 555
 556         /* Warn if it is out of range */
 557         if (hwm >= high_hwm) {
 558                 DEBUG(0, ("Warning: %s range full!! (max: %lu)\n",
 559                           hwmtype, (unsigned long)high_hwm));
 560         }
 561
 562         ret = dbwrap_trans_store_uint32(idmap_alloc_db, hwmkey, hwm);
 563
 564         return ret;
 565 }
 566
 567 /**********************************
 568  Close the alloc tdb
 569 **********************************/
 570
 571 static NTSTATUS idmap_tdb_alloc_close(void)
 572 {
 573         TALLOC_FREE(idmap_alloc_db);
 574         return NT_STATUS_OK;
 575 }
 576
 577 /**********************************************************************
 578  IDMAP MAPPING TDB BACKEND
 579 **********************************************************************/
 580
 581 struct idmap_tdb_context {
 582         struct db_context *db;
 583         uint32_t filter_low_id;
 584         uint32_t filter_high_id;
 585 };
 586
 587 /*****************************
 588  Initialise idmap database.
 589 *****************************/
 590
 591 static NTSTATUS idmap_tdb_db_init(struct idmap_domain *dom, const char *params)
 592 {
 593         NTSTATUS ret;
 594         struct idmap_tdb_context *ctx;
 595
 596         DEBUG(10, ("idmap_tdb_db_init called for domain '%s'\n", dom->name));
 597
 598         ctx = talloc(dom, struct idmap_tdb_context);
 599         if ( ! ctx) {
 600                 DEBUG(0, ("Out of memory!\n"));
 601                 return NT_STATUS_NO_MEMORY;
 602         }
 603
 604         if (strequal(dom->name, "*")) {
 605                 uid_t low_uid = 0;
 606                 uid_t high_uid = 0;
 607                 gid_t low_gid = 0;
 608                 gid_t high_gid = 0;
 609
 610                 ctx->filter_low_id = 0;
 611                 ctx->filter_high_id = 0;
 612
 613                 if (lp_idmap_uid(&low_uid, &high_uid)) {
 614                         ctx->filter_low_id = low_uid;
 615                         ctx->filter_high_id = high_uid;
 616                 } else {
 617                         DEBUG(3, ("Warning: 'idmap uid' not set!\n"));
 618                 }
 619
 620                 if (lp_idmap_gid(&low_gid, &high_gid)) {
 621                         if ((low_gid != low_uid) || (high_gid != high_uid)) {
 622                                 DEBUG(1, ("Warning: 'idmap uid' and 'idmap gid'"
 623                                       " ranges do not agree -- building "
 624                                       "intersection\n"));
 625                                 ctx->filter_low_id = MAX(ctx->filter_low_id,
 626                                                          low_gid);
 627                                 ctx->filter_high_id = MIN(ctx->filter_high_id,
 628                                                           high_gid);
 629                         }
 630                 } else {
 631                         DEBUG(3, ("Warning: 'idmap gid' not set!\n"));
 632                 }
 633         } else {
 634                 char *config_option = NULL;
 635                 const char *range;
 636
 637                 config_option = talloc_asprintf(ctx, "idmap config %s", dom->name);
 638                 if ( ! config_option) {
 639                         DEBUG(0, ("Out of memory!\n"));
 640                         ret = NT_STATUS_NO_MEMORY;
 641                         goto failed;
 642                 }
 643
 644                 range = lp_parm_const_string(-1, config_option, "range", NULL);
 645                 if (( ! range) ||
 646                     (sscanf(range, "%u - %u", &ctx->filter_low_id, &ctx->filter_high_id) != 2))
 647                 {
 648                         ctx->filter_low_id = 0;
 649                         ctx->filter_high_id = 0;
 650                 }
 651
 652                 talloc_free(config_option);
 653         }
 654
 655         if (ctx->filter_low_id > ctx->filter_high_id) {
 656                 ctx->filter_low_id = 0;
 657                 ctx->filter_high_id = 0;
 658         }
 659
 660         DEBUG(10, ("idmap_tdb_db_init: filter range %u-%u loaded for domain "
 661               "'%s'\n", ctx->filter_low_id, ctx->filter_high_id, dom->name));
 662
 663         ret = idmap_tdb_open_db(ctx, false, &ctx->db);
 664         if ( ! NT_STATUS_IS_OK(ret)) {
 665                 goto failed;
 666         }
 667
 668         dom->private_data = ctx;
 669
 670         return NT_STATUS_OK;
 671
 672 failed:
 673         talloc_free(ctx);
 674         return ret;
 675 }
 676
 677 /**********************************
 678  Single id to sid lookup function.
 679 **********************************/
 680
 681 static NTSTATUS idmap_tdb_id_to_sid(struct idmap_tdb_context *ctx, struct id_map *map)
 682 {
 683         NTSTATUS ret;
 684         TDB_DATA data;
 685         char *keystr;
 686
 687         if (!ctx || !map) {
 688                 return NT_STATUS_INVALID_PARAMETER;
 689         }
 690
 691         /* apply filters before checking */
 692         if ((ctx->filter_low_id && (map->xid.id < ctx->filter_low_id)) ||
 693             (ctx->filter_high_id && (map->xid.id > ctx->filter_high_id))) {
 694                 DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
 695                                 map->xid.id, ctx->filter_low_id, ctx->filter_high_id));
 696                 return NT_STATUS_NONE_MAPPED;
 697         }
 698
 699         switch (map->xid.type) {
 700
 701         case ID_TYPE_UID:
 702                 keystr = talloc_asprintf(ctx, "UID %lu", (unsigned long)map->xid.id);
 703                 break;
 704
 705         case ID_TYPE_GID:
 706                 keystr = talloc_asprintf(ctx, "GID %lu", (unsigned long)map->xid.id);
 707                 break;
 708
 709         default:
 710                 DEBUG(2, ("INVALID unix ID type: 0x02%x\n", map->xid.type));
 711                 return NT_STATUS_INVALID_PARAMETER;
 712         }
 713
 714         /* final SAFE_FREE safe */
 715         data.dptr = NULL;
 716
 717         if (keystr == NULL) {
 718                 DEBUG(0, ("Out of memory!\n"));
 719                 ret = NT_STATUS_NO_MEMORY;
 720                 goto done;
 721         }
 722
 723         DEBUG(10,("Fetching record %s\n", keystr));
 724
 725         /* Check if the mapping exists */
 726         data = dbwrap_fetch_bystring(ctx->db, NULL, keystr);
 727
 728         if (!data.dptr) {
 729                 DEBUG(10,("Record %s not found\n", keystr));
 730                 ret = NT_STATUS_NONE_MAPPED;
 731                 goto done;
 732         }
 733
 734         if (!string_to_sid(map->sid, (const char *)data.dptr)) {
 735                 DEBUG(10,("INVALID SID (%s) in record %s\n",
 736                         (const char *)data.dptr, keystr));
 737                 ret = NT_STATUS_INTERNAL_DB_ERROR;
 738                 goto done;
 739         }
 740
 741         DEBUG(10,("Found record %s -> %s\n", keystr, (const char *)data.dptr));
 742         ret = NT_STATUS_OK;
 743
 744 done:
 745         talloc_free(data.dptr);
 746         talloc_free(keystr);
 747         return ret;
 748 }
 749
 750 /**********************************
 751  Single sid to id lookup function.
 752 **********************************/
 753
 754 static NTSTATUS idmap_tdb_sid_to_id(struct idmap_tdb_context *ctx, struct id_map *map)
 755 {
 756         NTSTATUS ret;
 757         TDB_DATA data;
 758         char *keystr;
 759         unsigned long rec_id = 0;
 760         TALLOC_CTX *tmp_ctx = talloc_stackframe();
 761
 762         keystr = sid_string_talloc(tmp_ctx, map->sid);
 763         if (keystr == NULL) {
 764                 DEBUG(0, ("Out of memory!\n"));
 765                 ret = NT_STATUS_NO_MEMORY;
 766                 goto done;
 767         }
 768
 769         DEBUG(10,("Fetching record %s\n", keystr));
 770
 771         /* Check if sid is present in database */
 772         data = dbwrap_fetch_bystring(ctx->db, tmp_ctx, keystr);
 773         if (!data.dptr) {
 774                 DEBUG(10,("Record %s not found\n", keystr));
 775                 ret = NT_STATUS_NONE_MAPPED;
 776                 goto done;
 777         }
 778
 779         /* What type of record is this ? */
 780         if (sscanf((const char *)data.dptr, "UID %lu", &rec_id) == 1) { /* Try a UID record. */
 781                 map->xid.id = rec_id;
 782                 map->xid.type = ID_TYPE_UID;
 783                 DEBUG(10,("Found uid record %s -> %s \n", keystr, (const char *)data.dptr ));
 784                 ret = NT_STATUS_OK;
 785
 786         } else if (sscanf((const char *)data.dptr, "GID %lu", &rec_id) == 1) { /* Try a GID record. */
 787                 map->xid.id = rec_id;
 788                 map->xid.type = ID_TYPE_GID;
 789                 DEBUG(10,("Found gid record %s -> %s \n", keystr, (const char *)data.dptr ));
 790                 ret = NT_STATUS_OK;
 791
 792         } else { /* Unknown record type ! */
 793                 DEBUG(2, ("Found INVALID record %s -> %s\n", keystr, (const char *)data.dptr));
 794                 ret = NT_STATUS_INTERNAL_DB_ERROR;
 795         }
 796
 797         /* apply filters before returning result */
 798         if ((ctx->filter_low_id && (map->xid.id < ctx->filter_low_id)) ||
 799             (ctx->filter_high_id && (map->xid.id > ctx->filter_high_id))) {
 800                 DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
 801                                 map->xid.id, ctx->filter_low_id, ctx->filter_high_id));
 802                 ret = NT_STATUS_NONE_MAPPED;
 803         }
 804
 805 done:
 806         talloc_free(tmp_ctx);
 807         return ret;
 808 }
 809
 810 /**********************************
 811  lookup a set of unix ids.
 812 **********************************/
 813
 814 static NTSTATUS idmap_tdb_unixids_to_sids(struct idmap_domain *dom, struct id_map **ids)
 815 {
 816         struct idmap_tdb_context *ctx;
 817         NTSTATUS ret;
 818         int i;
 819
 820         /* initialize the status to avoid suprise */
 821         for (i = 0; ids[i]; i++) {
 822                 ids[i]->status = ID_UNKNOWN;
 823         }
 824
 825         ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
 826
 827         for (i = 0; ids[i]; i++) {
 828                 ret = idmap_tdb_id_to_sid(ctx, ids[i]);
 829                 if ( ! NT_STATUS_IS_OK(ret)) {
 830
 831                         /* if it is just a failed mapping continue */
 832                         if (NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED)) {
 833
 834                                 /* make sure it is marked as unmapped */
 835                                 ids[i]->status = ID_UNMAPPED;
 836                                 continue;
 837                         }
 838
 839                         /* some fatal error occurred, return immediately */
 840                         goto done;
 841                 }
 842
 843                 /* all ok, id is mapped */
 844                 ids[i]->status = ID_MAPPED;
 845         }
 846
 847         ret = NT_STATUS_OK;
 848
 849 done:
 850         return ret;
 851 }
 852
 853 /**********************************
 854  lookup a set of sids.
 855 **********************************/
 856
 857 static NTSTATUS idmap_tdb_sids_to_unixids(struct idmap_domain *dom, struct id_map **ids)
 858 {
 859         struct idmap_tdb_context *ctx;
 860         NTSTATUS ret;
 861         int i;
 862
 863         /* initialize the status to avoid suprise */
 864         for (i = 0; ids[i]; i++) {
 865                 ids[i]->status = ID_UNKNOWN;
 866         }
 867
 868         ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
 869
 870         for (i = 0; ids[i]; i++) {
 871                 ret = idmap_tdb_sid_to_id(ctx, ids[i]);
 872                 if ( ! NT_STATUS_IS_OK(ret)) {
 873
 874                         /* if it is just a failed mapping continue */
 875                         if (NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED)) {
 876
 877                                 /* make sure it is marked as unmapped */
 878                                 ids[i]->status = ID_UNMAPPED;
 879                                 continue;
 880                         }
 881
 882                         /* some fatal error occurred, return immediately */
 883                         goto done;
 884                 }
 885
 886                 /* all ok, id is mapped */
 887                 ids[i]->status = ID_MAPPED;
 888         }
 889
 890         ret = NT_STATUS_OK;
 891
 892 done:
 893         return ret;
 894 }
 895
 896 /**********************************
 897  set a mapping.
 898 **********************************/
 899
 900 static NTSTATUS idmap_tdb_set_mapping(struct idmap_domain *dom,
 901                                       const struct id_map *map)
 902 {
 903         struct idmap_tdb_context *ctx;
 904         NTSTATUS ret;
 905         TDB_DATA ksid, kid;
 906         char *ksidstr, *kidstr;
 907         fstring tmp;
 908
 909         if (!map || !map->sid) {
 910                 return NT_STATUS_INVALID_PARAMETER;
 911         }
 912
 913         ksidstr = kidstr = NULL;
 914
 915         /* TODO: should we filter a set_mapping using low/high filters ? */
 916
 917         ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
 918
 919         switch (map->xid.type) {
 920
 921         case ID_TYPE_UID:
 922                 kidstr = talloc_asprintf(ctx, "UID %lu",
 923                                          (unsigned long)map->xid.id);
 924                 break;
 925
 926         case ID_TYPE_GID:
 927                 kidstr = talloc_asprintf(ctx, "GID %lu",
 928                                          (unsigned long)map->xid.id);
 929                 break;
 930
 931         default:
 932                 DEBUG(2, ("INVALID unix ID type: 0x02%x\n", map->xid.type));
 933                 return NT_STATUS_INVALID_PARAMETER;
 934         }
 935
 936         if (kidstr == NULL) {
 937                 DEBUG(0, ("ERROR: Out of memory!\n"));
 938                 ret = NT_STATUS_NO_MEMORY;
 939                 goto done;
 940         }
 941
 942         if ((ksidstr = talloc_asprintf(
 943                      ctx, "%s", sid_to_fstring(tmp, map->sid))) == NULL) {
 944                 DEBUG(0, ("Out of memory!\n"));
 945                 ret = NT_STATUS_NO_MEMORY;
 946                 goto done;
 947         }
 948
 949         DEBUG(10, ("Storing %s <-> %s map\n", ksidstr, kidstr));
 950         kid = string_term_tdb_data(kidstr);
 951         ksid = string_term_tdb_data(ksidstr);
 952
 953         if (ctx->db->transaction_start(ctx->db) != 0) {
 954                 DEBUG(0, ("Failed to start transaction for %s\n",
 955                           ksidstr));
 956                 ret = NT_STATUS_INTERNAL_DB_ERROR;
 957                 goto done;
 958         }
 959
 960         ret = dbwrap_store(ctx->db, ksid, kid, TDB_REPLACE);
 961         if (!NT_STATUS_IS_OK(ret)) {
 962                 ctx->db->transaction_cancel(ctx->db);
 963                 DEBUG(0, ("Error storing SID -> ID (%s -> %s): %s\n",
 964                           ksidstr, kidstr, nt_errstr(ret)));
 965                 goto done;
 966         }
 967         ret = dbwrap_store(ctx->db, kid, ksid, TDB_REPLACE);
 968         if (!NT_STATUS_IS_OK(ret)) {
 969                 ctx->db->transaction_cancel(ctx->db);
 970                 DEBUG(0, ("Error storing ID -> SID (%s -> %s): %s\n",
 971                           kidstr, ksidstr, nt_errstr(ret)));
 972                 goto done;
 973         }
 974
 975         if (ctx->db->transaction_commit(ctx->db) != 0) {
 976                 DEBUG(0, ("Failed to commit transaction for (%s -> %s)\n",
 977                           ksidstr, kidstr));
 978                 ret = NT_STATUS_INTERNAL_DB_ERROR;
 979                 goto done;
 980         }
 981
 982         DEBUG(10,("Stored %s <-> %s\n", ksidstr, kidstr));
 983         ret = NT_STATUS_OK;
 984
 985 done:
 986         talloc_free(ksidstr);
 987         talloc_free(kidstr);
 988         return ret;
 989 }
 990
 991 /**********************************
 992  remove a mapping.
 993 **********************************/
 994
 995 static NTSTATUS idmap_tdb_remove_mapping(struct idmap_domain *dom,
 996                                          const struct id_map *map)
 997 {
 998         struct idmap_tdb_context *ctx;
 999         NTSTATUS ret;
1000         TDB_DATA ksid, kid, data;
1001         char *ksidstr, *kidstr;
1002         fstring tmp;
1003
1004         if (!map || !map->sid) {
1005                 return NT_STATUS_INVALID_PARAMETER;
1006         }
1007
1008         ksidstr = kidstr = NULL;
1009         data.dptr = NULL;
1010
1011         /* TODO: should we filter a remove_mapping using low/high filters ? */
1012
1013         ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
1014
1015         switch (map->xid.type) {
1016
1017         case ID_TYPE_UID:
1018                 kidstr = talloc_asprintf(ctx, "UID %lu",
1019                                          (unsigned long)map->xid.id);
1020                 break;
1021
1022         case ID_TYPE_GID:
1023                 kidstr = talloc_asprintf(ctx, "GID %lu",
1024                                          (unsigned long)map->xid.id);
1025                 break;
1026
1027         default:
1028                 DEBUG(2, ("INVALID unix ID type: 0x02%x\n", map->xid.type));
1029                 return NT_STATUS_INVALID_PARAMETER;
1030         }
1031
1032         if (kidstr == NULL) {
1033                 DEBUG(0, ("ERROR: Out of memory!\n"));
1034                 ret = NT_STATUS_NO_MEMORY;
1035                 goto done;
1036         }
1037
1038         if ((ksidstr = talloc_asprintf(
1039                      ctx, "%s", sid_to_fstring(tmp, map->sid))) == NULL) {
1040                 DEBUG(0, ("Out of memory!\n"));
1041                 ret = NT_STATUS_NO_MEMORY;
1042                 goto done;
1043         }
1044
1045         DEBUG(10, ("Checking %s <-> %s map\n", ksidstr, kidstr));
1046         ksid = string_term_tdb_data(ksidstr);
1047         kid = string_term_tdb_data(kidstr);
1048
1049         if (ctx->db->transaction_start(ctx->db) != 0) {
1050                 DEBUG(0, ("Failed to start transaction for %s\n",
1051                           ksidstr));
1052                 return NT_STATUS_INTERNAL_DB_ERROR;
1053         }
1054
1055         /* Check if sid is present in database */
1056         data = dbwrap_fetch(ctx->db, NULL, ksid);
1057         if (!data.dptr) {
1058                 ctx->db->transaction_cancel(ctx->db);
1059                 DEBUG(10,("Record %s not found\n", ksidstr));
1060                 ret = NT_STATUS_NONE_MAPPED;
1061                 goto done;
1062         }
1063
1064         /* Check if sid is mapped to the specified ID */
1065         if ((data.dsize != kid.dsize) ||
1066             (memcmp(data.dptr, kid.dptr, data.dsize) != 0)) {
1067                 ctx->db->transaction_cancel(ctx->db);
1068                 DEBUG(10,("Specified SID does not map to specified ID\n"));
1069                 DEBUGADD(10,("Actual mapping is %s -> %s\n", ksidstr,
1070                          (const char *)data.dptr));
1071                 ret = NT_STATUS_NONE_MAPPED;
1072                 goto done;
1073         }
1074
1075         DEBUG(10, ("Removing %s <-> %s map\n", ksidstr, kidstr));
1076
1077         /* Delete previous mappings. */
1078
1079         DEBUG(10, ("Deleting existing mapping %s -> %s\n", ksidstr, kidstr ));
1080         ret = dbwrap_delete(ctx->db, ksid);
1081         if (!NT_STATUS_IS_OK(ret)) {
1082                 DEBUG(0,("Warning: Failed to delete %s: %s\n",
1083                          ksidstr, nt_errstr(ret)));
1084         }
1085
1086         DEBUG(10,("Deleting existing mapping %s -> %s\n", kidstr, ksidstr ));
1087         ret = dbwrap_delete(ctx->db, kid);
1088         if (!NT_STATUS_IS_OK(ret)) {
1089                 DEBUG(0,("Warning: Failed to delete %s: %s\n",
1090                          kidstr, nt_errstr(ret)));
1091         }
1092
1093         if (ctx->db->transaction_commit(ctx->db) != 0) {
1094                 DEBUG(0, ("Failed to commit transaction for (%s -> %s)\n",
1095                           ksidstr, kidstr));
1096                 ret = NT_STATUS_INTERNAL_DB_ERROR;
1097                 goto done;
1098         }
1099
1100         ret = NT_STATUS_OK;
1101
1102 done:
1103         talloc_free(ksidstr);
1104         talloc_free(kidstr);
1105         talloc_free(data.dptr);
1106         return ret;
1107 }
1108
1109 /**********************************
1110  Close the idmap tdb instance
1111 **********************************/
1112
1113 static NTSTATUS idmap_tdb_close(struct idmap_domain *dom)
1114 {
1115         struct idmap_tdb_context *ctx;
1116
1117         if (dom->private_data) {
1118                 ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
1119
1120                 TALLOC_FREE(ctx->db);
1121         }
1122         return NT_STATUS_OK;
1123 }
1124
1125 struct dump_data {
1126         TALLOC_CTX *memctx;
1127         struct id_map **maps;
1128         int *num_maps;
1129         NTSTATUS ret;
1130 };
1131
1132 static int idmap_tdb_dump_one_entry(struct db_record *rec, void *pdata)
1133 {
1134         struct dump_data *data = talloc_get_type(pdata, struct dump_data);
1135         struct id_map *maps;
1136         int num_maps = *data->num_maps;
1137
1138         /* ignore any record but the ones with a SID as key */
1139         if (strncmp((const char *)rec->key.dptr, "S-", 2) == 0) {
1140
1141                 maps = talloc_realloc(NULL, *data->maps, struct id_map, num_maps+1);
1142                 if ( ! maps) {
1143                         DEBUG(0, ("Out of memory!\n"));
1144                         data->ret = NT_STATUS_NO_MEMORY;
1145                         return -1;
1146                 }
1147                 *data->maps = maps;
1148                 maps[num_maps].sid = talloc(maps, DOM_SID);
1149                 if ( ! maps[num_maps].sid) {
1150                         DEBUG(0, ("Out of memory!\n"));
1151                         data->ret = NT_STATUS_NO_MEMORY;
1152                         return -1;
1153                 }
1154
1155                 if (!string_to_sid(maps[num_maps].sid, (const char *)rec->key.dptr)) {
1156                         DEBUG(10,("INVALID record %s\n", (const char *)rec->key.dptr));
1157                         /* continue even with errors */
1158                         return 0;
1159                 }
1160
1161                 /* Try a UID record. */
1162                 if (sscanf((const char *)rec->value.dptr, "UID %u", &(maps[num_maps].xid.id)) == 1) {
1163                         maps[num_maps].xid.type = ID_TYPE_UID;
1164                         maps[num_maps].status = ID_MAPPED;
1165                         *data->num_maps = num_maps + 1;
1166
1167                 /* Try a GID record. */
1168                 } else
1169                 if (sscanf((const char *)rec->value.dptr, "GID %u", &(maps[num_maps].xid.id)) == 1) {
1170                         maps[num_maps].xid.type = ID_TYPE_GID;
1171                         maps[num_maps].status = ID_MAPPED;
1172                         *data->num_maps = num_maps + 1;
1173
1174                 /* Unknown record type ! */
1175                 } else {
1176                         maps[num_maps].status = ID_UNKNOWN;
1177                         DEBUG(2, ("Found INVALID record %s -> %s\n",
1178                                 (const char *)rec->key.dptr,
1179                                 (const char *)rec->value.dptr));
1180                         /* do not increment num_maps */
1181                 }
1182         }
1183
1184         return 0;
1185 }
1186
1187 /**********************************
1188  Dump all mappings out
1189 **********************************/
1190
1191 static NTSTATUS idmap_tdb_dump_data(struct idmap_domain *dom, struct id_map **maps, int *num_maps)
1192 {
1193         struct idmap_tdb_context *ctx;
1194         struct dump_data *data;
1195         NTSTATUS ret = NT_STATUS_OK;
1196
1197         ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
1198
1199         data = TALLOC_ZERO_P(ctx, struct dump_data);
1200         if ( ! data) {
1201                 DEBUG(0, ("Out of memory!\n"));
1202                 return NT_STATUS_NO_MEMORY;
1203         }
1204         data->maps = maps;
1205         data->num_maps = num_maps;
1206         data->ret = NT_STATUS_OK;
1207
1208         ctx->db->traverse_read(ctx->db, idmap_tdb_dump_one_entry, data);
1209
1210         if ( ! NT_STATUS_IS_OK(data->ret)) {
1211                 ret = data->ret;
1212         }
1213
1214         talloc_free(data);
1215         return ret;
1216 }
1217
1218 static struct idmap_methods db_methods = {
1219
1220         .init = idmap_tdb_db_init,
1221         .unixids_to_sids = idmap_tdb_unixids_to_sids,
1222         .sids_to_unixids = idmap_tdb_sids_to_unixids,
1223         .set_mapping = idmap_tdb_set_mapping,
1224         .remove_mapping = idmap_tdb_remove_mapping,
1225         .dump_data = idmap_tdb_dump_data,
1226         .close_fn = idmap_tdb_close
1227 };
1228
1229 static struct idmap_alloc_methods db_alloc_methods = {
1230
1231         .init = idmap_tdb_alloc_init,
1232         .allocate_id = idmap_tdb_allocate_id,
1233         .get_id_hwm = idmap_tdb_get_hwm,
1234         .set_id_hwm = idmap_tdb_set_hwm,
1235         .close_fn = idmap_tdb_alloc_close
1236 };
1237
1238 NTSTATUS idmap_alloc_tdb_init(void)
1239 {
1240         return smb_register_idmap_alloc(SMB_IDMAP_INTERFACE_VERSION, "tdb", &db_alloc_methods);
1241 }
1242
1243 NTSTATUS idmap_tdb_init(void)
1244 {
1245         NTSTATUS ret;
1246
1247         DEBUG(10, ("calling idmap_tdb_init\n"));
1248
1249         /* FIXME: bad hack to actually register also the alloc_tdb module without changining configure.in */
1250         ret = idmap_alloc_tdb_init();
1251         if (! NT_STATUS_IS_OK(ret)) {
1252                 return ret;
1253         }
1254         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "tdb", &db_methods);
1255 }