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         struct 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 struct idmap_tdb_allocate_id_context {
 402         const char *hwmkey;
 403         const char *hwmtype;
 404         uint32_t high_hwm;
 405         uint32_t hwm;
 406 };
 407
 408 static NTSTATUS idmap_tdb_allocate_id_action(struct db_context *db,
 409                                              void *private_data)
 410 {
 411         NTSTATUS ret;
 412         struct idmap_tdb_allocate_id_context *state;
 413         uint32_t hwm;
 414
 415         state = (struct idmap_tdb_allocate_id_context *)private_data;
 416
 417         hwm = dbwrap_fetch_int32(db, state->hwmkey);
 418         if (hwm == -1) {
 419                 ret = NT_STATUS_INTERNAL_DB_ERROR;
 420                 goto done;
 421         }
 422
 423         /* check it is in the range */
 424         if (hwm > state->high_hwm) {
 425                 DEBUG(1, ("Fatal Error: %s range full!! (max: %lu)\n",
 426                           state->hwmtype, (unsigned long)state->high_hwm));
 427                 ret = NT_STATUS_UNSUCCESSFUL;
 428                 goto done;
 429         }
 430
 431         /* fetch a new id and increment it */
 432         ret = dbwrap_trans_change_uint32_atomic(db, state->hwmkey, &hwm, 1);
 433         if (!NT_STATUS_IS_OK(ret)) {
 434                 DEBUG(0, ("Fatal error while fetching a new %s value: %s\n!",
 435                           state->hwmtype, nt_errstr(ret)));
 436                 goto done;
 437         }
 438
 439         /* recheck it is in the range */
 440         if (hwm > state->high_hwm) {
 441                 DEBUG(1, ("Fatal Error: %s range full!! (max: %lu)\n",
 442                           state->hwmtype, (unsigned long)state->high_hwm));
 443                 ret = NT_STATUS_UNSUCCESSFUL;
 444                 goto done;
 445         }
 446
 447         ret = NT_STATUS_OK;
 448         state->hwm = hwm;
 449
 450 done:
 451         return ret;
 452 }
 453
 454 static NTSTATUS idmap_tdb_allocate_id(struct unixid *xid)
 455 {
 456         const char *hwmkey;
 457         const char *hwmtype;
 458         uint32_t high_hwm;
 459         uint32_t hwm = 0;
 460         NTSTATUS status;
 461         struct idmap_tdb_allocate_id_context state;
 462
 463         /* Get current high water mark */
 464         switch (xid->type) {
 465
 466         case ID_TYPE_UID:
 467                 hwmkey = HWM_USER;
 468                 hwmtype = "UID";
 469                 high_hwm = idmap_tdb_state.high_uid;
 470                 break;
 471
 472         case ID_TYPE_GID:
 473                 hwmkey = HWM_GROUP;
 474                 hwmtype = "GID";
 475                 high_hwm = idmap_tdb_state.high_gid;
 476                 break;
 477
 478         default:
 479                 DEBUG(2, ("Invalid ID type (0x%x)\n", xid->type));
 480                 return NT_STATUS_INVALID_PARAMETER;
 481         }
 482
 483         state.hwm = hwm;
 484         state.high_hwm = high_hwm;
 485         state.hwmtype = hwmtype;
 486         state.hwmkey = hwmkey;
 487
 488         status = dbwrap_trans_do(idmap_alloc_db, idmap_tdb_allocate_id_action,
 489                                  &state);
 490
 491         if (NT_STATUS_IS_OK(status)) {
 492                 xid->id = state.hwm;
 493                 DEBUG(10,("New %s = %d\n", hwmtype, state.hwm));
 494         } else {
 495                 DEBUG(1, ("Error allocating a new %s\n", hwmtype));
 496         }
 497
 498         return status;
 499 }
 500
 501 /**
 502  * Allocate a new unix-ID.
 503  * For now this is for the default idmap domain only.
 504  * Should be extended later on.
 505  */
 506 static NTSTATUS idmap_tdb_get_new_id(struct idmap_domain *dom,
 507                                      struct unixid *id)
 508 {
 509         NTSTATUS ret;
 510
 511         if (!strequal(dom->name, "*")) {
 512                 DEBUG(3, ("idmap_tdb_get_new_id: "
 513                           "Refusing allocation of a new unixid for domain'%s'. "
 514                           "Currently only supported for the default "
 515                           "domain \"*\".\n",
 516                            dom->name));
 517                 return NT_STATUS_NOT_IMPLEMENTED;
 518         }
 519
 520         ret = idmap_tdb_allocate_id(id);
 521
 522         return ret;
 523 }
 524
 525 /**********************************
 526  Close the alloc tdb
 527 **********************************/
 528
 529 static NTSTATUS idmap_tdb_alloc_close(void)
 530 {
 531         TALLOC_FREE(idmap_alloc_db);
 532         return NT_STATUS_OK;
 533 }
 534
 535 /**********************************************************************
 536  IDMAP MAPPING TDB BACKEND
 537 **********************************************************************/
 538
 539 struct idmap_tdb_context {
 540         struct db_context *db;
 541         uint32_t filter_low_id;
 542         uint32_t filter_high_id;
 543 };
 544
 545 /*****************************
 546  Initialise idmap database.
 547 *****************************/
 548
 549 static NTSTATUS idmap_tdb_db_init(struct idmap_domain *dom, const char *params)
 550 {
 551         NTSTATUS ret;
 552         struct idmap_tdb_context *ctx;
 553
 554         DEBUG(10, ("idmap_tdb_db_init called for domain '%s'\n", dom->name));
 555
 556         ctx = talloc(dom, struct idmap_tdb_context);
 557         if ( ! ctx) {
 558                 DEBUG(0, ("Out of memory!\n"));
 559                 return NT_STATUS_NO_MEMORY;
 560         }
 561
 562         if (strequal(dom->name, "*")) {
 563                 uid_t low_uid = 0;
 564                 uid_t high_uid = 0;
 565                 gid_t low_gid = 0;
 566                 gid_t high_gid = 0;
 567
 568                 ctx->filter_low_id = 0;
 569                 ctx->filter_high_id = 0;
 570
 571                 if (lp_idmap_uid(&low_uid, &high_uid)) {
 572                         ctx->filter_low_id = low_uid;
 573                         ctx->filter_high_id = high_uid;
 574                 } else {
 575                         DEBUG(3, ("Warning: 'idmap uid' not set!\n"));
 576                 }
 577
 578                 if (lp_idmap_gid(&low_gid, &high_gid)) {
 579                         if ((low_gid != low_uid) || (high_gid != high_uid)) {
 580                                 DEBUG(1, ("Warning: 'idmap uid' and 'idmap gid'"
 581                                       " ranges do not agree -- building "
 582                                       "intersection\n"));
 583                                 ctx->filter_low_id = MAX(ctx->filter_low_id,
 584                                                          low_gid);
 585                                 ctx->filter_high_id = MIN(ctx->filter_high_id,
 586                                                           high_gid);
 587                         }
 588                 } else {
 589                         DEBUG(3, ("Warning: 'idmap gid' not set!\n"));
 590                 }
 591         } else {
 592                 char *config_option = NULL;
 593                 const char *range;
 594
 595                 config_option = talloc_asprintf(ctx, "idmap config %s", dom->name);
 596                 if ( ! config_option) {
 597                         DEBUG(0, ("Out of memory!\n"));
 598                         ret = NT_STATUS_NO_MEMORY;
 599                         goto failed;
 600                 }
 601
 602                 range = lp_parm_const_string(-1, config_option, "range", NULL);
 603                 if (( ! range) ||
 604                     (sscanf(range, "%u - %u", &ctx->filter_low_id, &ctx->filter_high_id) != 2))
 605                 {
 606                         ctx->filter_low_id = 0;
 607                         ctx->filter_high_id = 0;
 608                 }
 609
 610                 talloc_free(config_option);
 611         }
 612
 613         if (ctx->filter_low_id > ctx->filter_high_id) {
 614                 ctx->filter_low_id = 0;
 615                 ctx->filter_high_id = 0;
 616         }
 617
 618         DEBUG(10, ("idmap_tdb_db_init: filter range %u-%u loaded for domain "
 619               "'%s'\n", ctx->filter_low_id, ctx->filter_high_id, dom->name));
 620
 621         ret = idmap_tdb_open_db(ctx, false, &ctx->db);
 622         if ( ! NT_STATUS_IS_OK(ret)) {
 623                 goto failed;
 624         }
 625
 626         dom->private_data = ctx;
 627
 628         return NT_STATUS_OK;
 629
 630 failed:
 631         talloc_free(ctx);
 632         return ret;
 633 }
 634
 635 /**********************************
 636  Single id to sid lookup function.
 637 **********************************/
 638
 639 static NTSTATUS idmap_tdb_id_to_sid(struct idmap_domain *dom, struct id_map *map)
 640 {
 641         NTSTATUS ret;
 642         TDB_DATA data;
 643         char *keystr;
 644         struct idmap_tdb_context *ctx;
 645
 646         if (!dom || !map) {
 647                 return NT_STATUS_INVALID_PARAMETER;
 648         }
 649
 650         ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
 651
 652         /* apply filters before checking */
 653         if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
 654                 DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
 655                                 map->xid.id, dom->low_id, dom->high_id));
 656                 return NT_STATUS_NONE_MAPPED;
 657         }
 658
 659         switch (map->xid.type) {
 660
 661         case ID_TYPE_UID:
 662                 keystr = talloc_asprintf(ctx, "UID %lu", (unsigned long)map->xid.id);
 663                 break;
 664
 665         case ID_TYPE_GID:
 666                 keystr = talloc_asprintf(ctx, "GID %lu", (unsigned long)map->xid.id);
 667                 break;
 668
 669         default:
 670                 DEBUG(2, ("INVALID unix ID type: 0x02%x\n", map->xid.type));
 671                 return NT_STATUS_INVALID_PARAMETER;
 672         }
 673
 674         /* final SAFE_FREE safe */
 675         data.dptr = NULL;
 676
 677         if (keystr == NULL) {
 678                 DEBUG(0, ("Out of memory!\n"));
 679                 ret = NT_STATUS_NO_MEMORY;
 680                 goto done;
 681         }
 682
 683         DEBUG(10,("Fetching record %s\n", keystr));
 684
 685         /* Check if the mapping exists */
 686         data = dbwrap_fetch_bystring(ctx->db, NULL, keystr);
 687
 688         if (!data.dptr) {
 689                 DEBUG(10,("Record %s not found\n", keystr));
 690                 ret = NT_STATUS_NONE_MAPPED;
 691                 goto done;
 692         }
 693
 694         if (!string_to_sid(map->sid, (const char *)data.dptr)) {
 695                 DEBUG(10,("INVALID SID (%s) in record %s\n",
 696                         (const char *)data.dptr, keystr));
 697                 ret = NT_STATUS_INTERNAL_DB_ERROR;
 698                 goto done;
 699         }
 700
 701         DEBUG(10,("Found record %s -> %s\n", keystr, (const char *)data.dptr));
 702         ret = NT_STATUS_OK;
 703
 704 done:
 705         talloc_free(data.dptr);
 706         talloc_free(keystr);
 707         return ret;
 708 }
 709
 710 /**********************************
 711  Single sid to id lookup function.
 712 **********************************/
 713
 714 static NTSTATUS idmap_tdb_sid_to_id(struct idmap_domain *dom, struct id_map *map)
 715 {
 716         NTSTATUS ret;
 717         TDB_DATA data;
 718         char *keystr;
 719         unsigned long rec_id = 0;
 720         struct idmap_tdb_context *ctx;
 721         TALLOC_CTX *tmp_ctx = talloc_stackframe();
 722
 723         ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
 724
 725         keystr = sid_string_talloc(tmp_ctx, map->sid);
 726         if (keystr == NULL) {
 727                 DEBUG(0, ("Out of memory!\n"));
 728                 ret = NT_STATUS_NO_MEMORY;
 729                 goto done;
 730         }
 731
 732         DEBUG(10,("Fetching record %s\n", keystr));
 733
 734         /* Check if sid is present in database */
 735         data = dbwrap_fetch_bystring(ctx->db, tmp_ctx, keystr);
 736         if (!data.dptr) {
 737                 DEBUG(10,("Record %s not found\n", keystr));
 738                 ret = NT_STATUS_NONE_MAPPED;
 739                 goto done;
 740         }
 741
 742         /* What type of record is this ? */
 743         if (sscanf((const char *)data.dptr, "UID %lu", &rec_id) == 1) { /* Try a UID record. */
 744                 map->xid.id = rec_id;
 745                 map->xid.type = ID_TYPE_UID;
 746                 DEBUG(10,("Found uid record %s -> %s \n", keystr, (const char *)data.dptr ));
 747                 ret = NT_STATUS_OK;
 748
 749         } else if (sscanf((const char *)data.dptr, "GID %lu", &rec_id) == 1) { /* Try a GID record. */
 750                 map->xid.id = rec_id;
 751                 map->xid.type = ID_TYPE_GID;
 752                 DEBUG(10,("Found gid record %s -> %s \n", keystr, (const char *)data.dptr ));
 753                 ret = NT_STATUS_OK;
 754
 755         } else { /* Unknown record type ! */
 756                 DEBUG(2, ("Found INVALID record %s -> %s\n", keystr, (const char *)data.dptr));
 757                 ret = NT_STATUS_INTERNAL_DB_ERROR;
 758                 goto done;
 759         }
 760
 761         /* apply filters before returning result */
 762         if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
 763                 DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
 764                                 map->xid.id, dom->low_id, dom->high_id));
 765                 ret = NT_STATUS_NONE_MAPPED;
 766         }
 767
 768 done:
 769         talloc_free(tmp_ctx);
 770         return ret;
 771 }
 772
 773 /**********************************
 774  lookup a set of unix ids.
 775 **********************************/
 776
 777 static NTSTATUS idmap_tdb_unixids_to_sids(struct idmap_domain *dom, struct id_map **ids)
 778 {
 779         struct idmap_tdb_context *ctx;
 780         NTSTATUS ret;
 781         int i;
 782
 783         /* initialize the status to avoid suprise */
 784         for (i = 0; ids[i]; i++) {
 785                 ids[i]->status = ID_UNKNOWN;
 786         }
 787
 788         ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
 789
 790         for (i = 0; ids[i]; i++) {
 791                 ret = idmap_tdb_id_to_sid(dom, ids[i]);
 792                 if ( ! NT_STATUS_IS_OK(ret)) {
 793
 794                         /* if it is just a failed mapping continue */
 795                         if (NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED)) {
 796
 797                                 /* make sure it is marked as unmapped */
 798                                 ids[i]->status = ID_UNMAPPED;
 799                                 continue;
 800                         }
 801
 802                         /* some fatal error occurred, return immediately */
 803                         goto done;
 804                 }
 805
 806                 /* all ok, id is mapped */
 807                 ids[i]->status = ID_MAPPED;
 808         }
 809
 810         ret = NT_STATUS_OK;
 811
 812 done:
 813         return ret;
 814 }
 815
 816 /**********************************
 817  lookup a set of sids.
 818 **********************************/
 819
 820 static NTSTATUS idmap_tdb_sids_to_unixids(struct idmap_domain *dom, struct id_map **ids)
 821 {
 822         struct idmap_tdb_context *ctx;
 823         NTSTATUS ret;
 824         int i;
 825
 826         /* initialize the status to avoid suprise */
 827         for (i = 0; ids[i]; i++) {
 828                 ids[i]->status = ID_UNKNOWN;
 829         }
 830
 831         ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
 832
 833         for (i = 0; ids[i]; i++) {
 834                 ret = idmap_tdb_sid_to_id(dom, ids[i]);
 835                 if ( ! NT_STATUS_IS_OK(ret)) {
 836
 837                         /* if it is just a failed mapping continue */
 838                         if (NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED)) {
 839
 840                                 /* make sure it is marked as unmapped */
 841                                 ids[i]->status = ID_UNMAPPED;
 842                                 continue;
 843                         }
 844
 845                         /* some fatal error occurred, return immediately */
 846                         goto done;
 847                 }
 848
 849                 /* all ok, id is mapped */
 850                 ids[i]->status = ID_MAPPED;
 851         }
 852
 853         ret = NT_STATUS_OK;
 854
 855 done:
 856         return ret;
 857 }
 858
 859 /**********************************
 860  set a mapping.
 861 **********************************/
 862
 863 static NTSTATUS idmap_tdb_set_mapping(struct idmap_domain *dom,
 864                                       const struct id_map *map)
 865 {
 866         struct idmap_tdb_context *ctx;
 867         NTSTATUS ret;
 868         TDB_DATA ksid, kid;
 869         char *ksidstr, *kidstr;
 870         fstring tmp;
 871
 872         if (!map || !map->sid) {
 873                 return NT_STATUS_INVALID_PARAMETER;
 874         }
 875
 876         ksidstr = kidstr = NULL;
 877
 878         /* TODO: should we filter a set_mapping using low/high filters ? */
 879
 880         ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
 881
 882         switch (map->xid.type) {
 883
 884         case ID_TYPE_UID:
 885                 kidstr = talloc_asprintf(ctx, "UID %lu",
 886                                          (unsigned long)map->xid.id);
 887                 break;
 888
 889         case ID_TYPE_GID:
 890                 kidstr = talloc_asprintf(ctx, "GID %lu",
 891                                          (unsigned long)map->xid.id);
 892                 break;
 893
 894         default:
 895                 DEBUG(2, ("INVALID unix ID type: 0x02%x\n", map->xid.type));
 896                 return NT_STATUS_INVALID_PARAMETER;
 897         }
 898
 899         if (kidstr == NULL) {
 900                 DEBUG(0, ("ERROR: Out of memory!\n"));
 901                 ret = NT_STATUS_NO_MEMORY;
 902                 goto done;
 903         }
 904
 905         if ((ksidstr = talloc_asprintf(
 906                      ctx, "%s", sid_to_fstring(tmp, map->sid))) == NULL) {
 907                 DEBUG(0, ("Out of memory!\n"));
 908                 ret = NT_STATUS_NO_MEMORY;
 909                 goto done;
 910         }
 911
 912         DEBUG(10, ("Storing %s <-> %s map\n", ksidstr, kidstr));
 913         kid = string_term_tdb_data(kidstr);
 914         ksid = string_term_tdb_data(ksidstr);
 915
 916         if (ctx->db->transaction_start(ctx->db) != 0) {
 917                 DEBUG(0, ("Failed to start transaction for %s\n",
 918                           ksidstr));
 919                 ret = NT_STATUS_INTERNAL_DB_ERROR;
 920                 goto done;
 921         }
 922
 923         ret = dbwrap_store(ctx->db, ksid, kid, TDB_REPLACE);
 924         if (!NT_STATUS_IS_OK(ret)) {
 925                 ctx->db->transaction_cancel(ctx->db);
 926                 DEBUG(0, ("Error storing SID -> ID (%s -> %s): %s\n",
 927                           ksidstr, kidstr, nt_errstr(ret)));
 928                 goto done;
 929         }
 930         ret = dbwrap_store(ctx->db, kid, ksid, TDB_REPLACE);
 931         if (!NT_STATUS_IS_OK(ret)) {
 932                 ctx->db->transaction_cancel(ctx->db);
 933                 DEBUG(0, ("Error storing ID -> SID (%s -> %s): %s\n",
 934                           kidstr, ksidstr, nt_errstr(ret)));
 935                 goto done;
 936         }
 937
 938         if (ctx->db->transaction_commit(ctx->db) != 0) {
 939                 DEBUG(0, ("Failed to commit transaction for (%s -> %s)\n",
 940                           ksidstr, kidstr));
 941                 ret = NT_STATUS_INTERNAL_DB_ERROR;
 942                 goto done;
 943         }
 944
 945         DEBUG(10,("Stored %s <-> %s\n", ksidstr, kidstr));
 946         ret = NT_STATUS_OK;
 947
 948 done:
 949         talloc_free(ksidstr);
 950         talloc_free(kidstr);
 951         return ret;
 952 }
 953
 954 /**********************************
 955  Close the idmap tdb instance
 956 **********************************/
 957
 958 static NTSTATUS idmap_tdb_close(struct idmap_domain *dom)
 959 {
 960         struct idmap_tdb_context *ctx;
 961
 962         if (dom->private_data) {
 963                 ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
 964
 965                 TALLOC_FREE(ctx->db);
 966         }
 967         return NT_STATUS_OK;
 968 }
 969
 970 static struct idmap_methods db_methods = {
 971         .init = idmap_tdb_db_init,
 972         .unixids_to_sids = idmap_tdb_unixids_to_sids,
 973         .sids_to_unixids = idmap_tdb_sids_to_unixids,
 974         .allocate_id = idmap_tdb_get_new_id,
 975         .close_fn = idmap_tdb_close
 976 };
 977
 978 NTSTATUS idmap_tdb_init(void)
 979 {
 980         DEBUG(10, ("calling idmap_tdb_init\n"));
 981
 982         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "tdb", &db_methods);
 983 }