source3/winbindd/idmap_autorid.c

   1 /*
   2  *  idmap_autorid: static map between Active Directory/NT RIDs
   3  *  and RFC 2307 accounts
   4  *
   5  *  based on the idmap_rid module, but this module defines the ranges
   6  *  for the domains by automatically allocating a range for each domain
   7  *
   8  *  Copyright (C) Christian Ambach, 2010-2011
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 3 of the License, or
  13  *  (at your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  22  *
  23  */
  24
  25 #include "includes.h"
  26 #include "system/filesys.h"
  27 #include "winbindd.h"
  28 #include "dbwrap/dbwrap.h"
  29 #include "dbwrap/dbwrap_open.h"
  30 #include "idmap.h"
  31 #include "../libcli/security/dom_sid.h"
  32 #include "util_tdb.h"
  33
  34 #undef DBGC_CLASS
  35 #define DBGC_CLASS DBGC_IDMAP
  36
  37 #define HWM "NEXT RANGE"
  38 #define ALLOC_HWM_UID "NEXT ALLOC UID"
  39 #define ALLOC_HWM_GID "NEXT ALLOC GID"
  40 #define ALLOC_RANGE "ALLOC"
  41 #define CONFIGKEY "CONFIG"
  42
  43 struct autorid_global_config {
  44         uint32_t minvalue;
  45         uint32_t rangesize;
  46         uint32_t maxranges;
  47 };
  48
  49 struct autorid_domain_config {
  50         fstring sid;
  51         uint32_t domainnum;
  52         struct autorid_global_config *globalcfg;
  53 };
  54
  55 /* handle to the tdb storing domain <-> range assignments */
  56 static struct db_context *autorid_db;
  57
  58 static NTSTATUS idmap_autorid_get_domainrange(struct db_context *db,
  59                                               void *private_data)
  60 {
  61         NTSTATUS ret;
  62         uint32_t domainnum, hwm;
  63         char *numstr;
  64         struct autorid_domain_config *cfg;
  65
  66         cfg = (struct autorid_domain_config *)private_data;
  67
  68         ret = dbwrap_fetch_uint32(db, cfg->sid, &domainnum);
  69         if (!NT_STATUS_IS_OK(ret)) {
  70                 DEBUG(10, ("Acquiring new range for domain %s\n", cfg->sid));
  71
  72                 /* fetch the current HWM */
  73                 ret = dbwrap_fetch_uint32(db, HWM, &hwm);
  74                 if (!NT_STATUS_IS_OK(ret)) {
  75                         DEBUG(1, ("Fatal error while fetching current "
  76                                   "HWM value: %s\n", nt_errstr(ret)));
  77                         ret = NT_STATUS_INTERNAL_ERROR;
  78                         goto error;
  79                 }
  80
  81                 /* do we have a range left? */
  82                 if (hwm >= cfg->globalcfg->maxranges) {
  83                         DEBUG(1, ("No more domain ranges available!\n"));
  84                         ret = NT_STATUS_NO_MEMORY;
  85                         goto error;
  86                 }
  87
  88                 /* increase the HWM */
  89                 ret = dbwrap_change_uint32_atomic(db, HWM, &domainnum, 1);
  90                 if (!NT_STATUS_IS_OK(ret)) {
  91                         DEBUG(1, ("Fatal error while fetching a new "
  92                                   "domain range value!\n"));
  93                         goto error;
  94                 }
  95
  96                 /* store away the new mapping in both directions */
  97                 ret = dbwrap_trans_store_uint32(db, cfg->sid, domainnum);
  98                 if (!NT_STATUS_IS_OK(ret)) {
  99                         DEBUG(1, ("Fatal error while storing new "
 100                                   "domain->range assignment!\n"));
 101                         goto error;
 102                 }
 103
 104                 numstr = talloc_asprintf(db, "%u", domainnum);
 105                 if (!numstr) {
 106                         ret = NT_STATUS_NO_MEMORY;
 107                         goto error;
 108                 }
 109
 110                 ret = dbwrap_trans_store_bystring(db, numstr,
 111                                 string_term_tdb_data(cfg->sid), TDB_INSERT);
 112
 113                 talloc_free(numstr);
 114                 if (!NT_STATUS_IS_OK(ret)) {
 115                         DEBUG(1, ("Fatal error while storing "
 116                                   "new domain->range assignment!\n"));
 117                         goto error;
 118                 }
 119                 DEBUG(5, ("Acquired new range #%d for domain %s\n",
 120                           domainnum, cfg->sid));
 121         }
 122
 123         DEBUG(10, ("Using range #%d for domain %s\n", domainnum, cfg->sid));
 124         cfg->domainnum = domainnum;
 125
 126         return NT_STATUS_OK;
 127
 128       error:
 129         return ret;
 130
 131 }
 132
 133 static NTSTATUS idmap_autorid_id_to_sid(struct autorid_global_config *cfg,
 134                                         struct id_map *map)
 135 {
 136         uint32_t range;
 137         TDB_DATA data;
 138         char *keystr;
 139         struct dom_sid sid;
 140         NTSTATUS status;
 141
 142         /* can this be one of our ids? */
 143         if (map->xid.id < cfg->minvalue) {
 144                 DEBUG(10, ("id %d is lower than minimum value, "
 145                            "ignoring mapping request\n", map->xid.id));
 146                 map->status = ID_UNKNOWN;
 147                 return NT_STATUS_OK;
 148         }
 149
 150         if (map->xid.id > (cfg->minvalue + cfg->rangesize * cfg->maxranges)) {
 151                 DEBUG(10, ("id %d is outside of maximum id value, "
 152                            "ignoring mapping request\n", map->xid.id));
 153                 map->status = ID_UNKNOWN;
 154                 return NT_STATUS_OK;
 155         }
 156
 157         /* determine the range of this uid */
 158         range = ((map->xid.id - cfg->minvalue) / cfg->rangesize);
 159
 160         keystr = talloc_asprintf(talloc_tos(), "%u", range);
 161         if (!keystr) {
 162                 return NT_STATUS_NO_MEMORY;
 163         }
 164
 165         status = dbwrap_fetch_bystring(autorid_db, talloc_tos(), keystr, &data);
 166         TALLOC_FREE(keystr);
 167
 168         if (!NT_STATUS_IS_OK(status)) {
 169                 DEBUG(4, ("id %d belongs to range %d which does not have "
 170                           "domain mapping, ignoring mapping request\n",
 171                           map->xid.id, range));
 172                 TALLOC_FREE(data.dptr);
 173                 map->status = ID_UNKNOWN;
 174                 return NT_STATUS_OK;
 175         }
 176
 177         if (strncmp((const char *)data.dptr,
 178                     ALLOC_RANGE,
 179                     strlen(ALLOC_RANGE)) == 0) {
 180                 /* this is from the alloc range, there is no mapping back */
 181                 DEBUG(5, ("id %d belongs to alloc range, cannot map back\n",
 182                           map->xid.id));
 183                 TALLOC_FREE(data.dptr);
 184                 map->status = ID_UNKNOWN;
 185                 return NT_STATUS_OK;
 186         }
 187
 188         string_to_sid(&sid, (const char *)data.dptr);
 189         TALLOC_FREE(data.dptr);
 190
 191         sid_compose(map->sid, &sid,
 192                     (map->xid.id - cfg->minvalue -
 193                      range * cfg->rangesize));
 194
 195         /* We **really** should have some way of validating
 196            the SID exists and is the correct type here.  But
 197            that is a deficiency in the idmap_rid design. */
 198
 199         map->status = ID_MAPPED;
 200         return NT_STATUS_OK;
 201 }
 202
 203 /**********************************
 204  Single sid to id lookup function.
 205 **********************************/
 206
 207 static NTSTATUS idmap_autorid_sid_to_id(struct autorid_global_config *global,
 208                                         struct autorid_domain_config *domain,
 209                                         struct id_map *map)
 210 {
 211         uint32_t rid;
 212
 213         sid_peek_rid(map->sid, &rid);
 214
 215         /* if the rid is higher than the size of the range, we cannot map it */
 216         if (rid >= global->rangesize) {
 217                 map->status = ID_UNKNOWN;
 218                 DEBUG(2, ("RID %d is larger then size of range (%d), "
 219                           "user cannot be mapped\n", rid, global->rangesize));
 220                 return NT_STATUS_UNSUCCESSFUL;
 221         }
 222         map->xid.id = global->minvalue +
 223             (global->rangesize * domain->domainnum)+rid;
 224
 225         /* We **really** should have some way of validating
 226            the SID exists and is the correct type here.  But
 227            that is a deficiency in the idmap_rid design. */
 228
 229         map->status = ID_MAPPED;
 230
 231         return NT_STATUS_OK;
 232 }
 233
 234 /**********************************
 235  lookup a set of unix ids.
 236 **********************************/
 237
 238 static NTSTATUS idmap_autorid_unixids_to_sids(struct idmap_domain *dom,
 239                                               struct id_map **ids)
 240 {
 241         struct autorid_global_config *globalcfg;
 242         NTSTATUS ret;
 243         int i;
 244
 245         /* initialize the status to avoid surprise */
 246         for (i = 0; ids[i]; i++) {
 247                 ids[i]->status = ID_UNKNOWN;
 248         }
 249
 250         globalcfg = talloc_get_type(dom->private_data,
 251                                     struct autorid_global_config);
 252
 253         for (i = 0; ids[i]; i++) {
 254
 255                 ret = idmap_autorid_id_to_sid(globalcfg, ids[i]);
 256
 257                 if ((!NT_STATUS_IS_OK(ret)) &&
 258                     (!NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
 259                         /* some fatal error occurred, log it */
 260                         DEBUG(3, ("Unexpected error resolving an ID "
 261                                   " (%d)\n", ids[i]->xid.id));
 262                         goto failure;
 263                 }
 264         }
 265         return NT_STATUS_OK;
 266
 267       failure:
 268         return ret;
 269 }
 270
 271 /**********************************
 272  lookup a set of sids.
 273 **********************************/
 274
 275 static NTSTATUS idmap_autorid_sids_to_unixids(struct idmap_domain *dom,
 276                                               struct id_map **ids)
 277 {
 278         struct autorid_global_config *global;
 279         NTSTATUS ret;
 280         int i;
 281
 282         /* initialize the status to avoid surprise */
 283         for (i = 0; ids[i]; i++) {
 284                 ids[i]->status = ID_UNKNOWN;
 285         }
 286
 287         global = talloc_get_type(dom->private_data,
 288                                  struct autorid_global_config);
 289
 290         for (i = 0; ids[i]; i++) {
 291                 struct winbindd_tdc_domain *domain;
 292                 struct autorid_domain_config domaincfg;
 293                 uint32_t rid;
 294                 struct dom_sid domainsid;
 295
 296                 ZERO_STRUCT(domaincfg);
 297
 298                 sid_copy(&domainsid, ids[i]->sid);
 299                 if (!sid_split_rid(&domainsid, &rid)) {
 300                         DEBUG(4, ("Could not determine domain SID from %s, "
 301                                   "ignoring mapping request\n",
 302                                   sid_string_dbg(ids[i]->sid)));
 303                         continue;
 304                 }
 305
 306                 /*
 307                  * Check if the domain is around
 308                  */
 309                 domain = wcache_tdc_fetch_domainbysid(talloc_tos(),
 310                                                       &domainsid);
 311                 if (domain == NULL) {
 312                         DEBUG(10, ("Ignoring unknown domain sid %s\n",
 313                                    sid_string_dbg(&domainsid)));
 314                         continue;
 315                 }
 316                 TALLOC_FREE(domain);
 317
 318                 domaincfg.globalcfg = global;
 319                 sid_to_fstring(domaincfg.sid, &domainsid);
 320
 321                 ret = dbwrap_trans_do(autorid_db,
 322                                       idmap_autorid_get_domainrange,
 323                                       &domaincfg);
 324
 325                 if (!NT_STATUS_IS_OK(ret)) {
 326                         DEBUG(3, ("Could not determine range for domain, "
 327                                   "check previous messages for reason\n"));
 328                         goto failure;
 329                 }
 330
 331                 ret = idmap_autorid_sid_to_id(global, &domaincfg, ids[i]);
 332
 333                 if ((!NT_STATUS_IS_OK(ret)) &&
 334                     (!NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
 335                         /* some fatal error occurred, log it */
 336                         DEBUG(3, ("Unexpected error resolving a SID (%s)\n",
 337                                   sid_string_dbg(ids[i]->sid)));
 338                         goto failure;
 339                 }
 340         }
 341         return NT_STATUS_OK;
 342
 343       failure:
 344         return ret;
 345
 346 }
 347
 348 /* initialize the given HWM to 0 if it does not exist yet */
 349 static NTSTATUS idmap_autorid_init_hwm(const char *hwm) {
 350
 351         NTSTATUS status;
 352         uint32_t hwmval;
 353
 354         status = dbwrap_fetch_uint32(autorid_db, hwm, &hwmval);
 355         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND))  {
 356                 status = dbwrap_trans_store_int32(autorid_db, hwm, 0);
 357                 if (!NT_STATUS_IS_OK(status)) {
 358                         DEBUG(0,
 359                               ("Unable to initialise HWM (%s) in autorid "
 360                                "database: %s\n", hwm, nt_errstr(status)));
 361                         return NT_STATUS_INTERNAL_DB_ERROR;
 362                 }
 363         } else if (!NT_STATUS_IS_OK(status)) {
 364                 DEBUG(0, ("unable to fetch HWM (%s) from autorid "
 365                           "database: %s\n", hwm,  nt_errstr(status)));
 366                 return status;
 367         }
 368
 369         return NT_STATUS_OK;
 370 }
 371
 372 /*
 373  * open and initialize the database which stores the ranges for the domains
 374  */
 375 static NTSTATUS idmap_autorid_db_init(void)
 376 {
 377         NTSTATUS status;
 378
 379         if (autorid_db) {
 380                 /* its already open */
 381                 return NT_STATUS_OK;
 382         }
 383
 384         /* Open idmap repository */
 385         autorid_db = db_open(NULL, state_path("autorid.tdb"), 0,
 386                              TDB_DEFAULT, O_RDWR | O_CREAT, 0644);
 387
 388         if (!autorid_db) {
 389                 DEBUG(0, ("Unable to open idmap_autorid database '%s'\n",
 390                           state_path("autorid.tdb")));
 391                 return NT_STATUS_UNSUCCESSFUL;
 392         }
 393
 394         /* Initialize high water mark for the currently used range to 0 */
 395
 396         status = idmap_autorid_init_hwm(HWM);
 397         NT_STATUS_NOT_OK_RETURN(status);
 398
 399         status = idmap_autorid_init_hwm(ALLOC_HWM_UID);
 400         NT_STATUS_NOT_OK_RETURN(status);
 401
 402         status = idmap_autorid_init_hwm(ALLOC_HWM_GID);
 403
 404         return status;
 405 }
 406
 407 static struct autorid_global_config *idmap_autorid_loadconfig(TALLOC_CTX * ctx)
 408 {
 409
 410         TDB_DATA data;
 411         struct autorid_global_config *cfg;
 412         unsigned long minvalue, rangesize, maxranges;
 413         NTSTATUS status;
 414
 415         status = dbwrap_fetch_bystring(autorid_db, ctx, CONFIGKEY, &data);
 416
 417         if (!NT_STATUS_IS_OK(status)) {
 418                 DEBUG(10, ("No saved config found\n"));
 419                 return NULL;
 420         }
 421
 422         cfg = talloc_zero(ctx, struct autorid_global_config);
 423         if (!cfg) {
 424                 return NULL;
 425         }
 426
 427         if (sscanf((char *)data.dptr,
 428                    "minvalue:%lu rangesize:%lu maxranges:%lu",
 429                    &minvalue, &rangesize, &maxranges) != 3) {
 430                 DEBUG(1,
 431                       ("Found invalid configuration data"
 432                        "creating new config\n"));
 433                 return NULL;
 434         }
 435
 436         cfg->minvalue = minvalue;
 437         cfg->rangesize = rangesize;
 438         cfg->maxranges = maxranges;
 439
 440         DEBUG(10, ("Loaded previously stored configuration "
 441                    "minvalue:%d rangesize:%d\n",
 442                    cfg->minvalue, cfg->rangesize));
 443
 444         return cfg;
 445
 446 }
 447
 448 static NTSTATUS idmap_autorid_saveconfig(struct autorid_global_config *cfg)
 449 {
 450
 451         NTSTATUS status;
 452         TDB_DATA data;
 453         char *cfgstr;
 454
 455         cfgstr =
 456             talloc_asprintf(talloc_tos(),
 457                             "minvalue:%u rangesize:%u maxranges:%u",
 458                             cfg->minvalue, cfg->rangesize, cfg->maxranges);
 459
 460         if (!cfgstr) {
 461                 return NT_STATUS_NO_MEMORY;
 462         }
 463
 464         data = string_tdb_data(cfgstr);
 465
 466         status = dbwrap_trans_store_bystring(autorid_db, CONFIGKEY,
 467                                              data, TDB_REPLACE);
 468
 469         talloc_free(cfgstr);
 470
 471         return status;
 472 }
 473
 474 static NTSTATUS idmap_autorid_initialize(struct idmap_domain *dom)
 475 {
 476         struct autorid_global_config *config;
 477         struct autorid_global_config *storedconfig = NULL;
 478         NTSTATUS status;
 479         uint32_t hwm;
 480
 481         if (!strequal(dom->name, "*")) {
 482                 DEBUG(0, ("idmap_autorid_initialize: Error: autorid configured "
 483                           "for domain '%s'. But autorid can only be used for "
 484                           "the default idmap configuration.\n", dom->name));
 485                 return NT_STATUS_INVALID_PARAMETER;
 486         }
 487
 488         config = talloc_zero(dom, struct autorid_global_config);
 489         if (!config) {
 490                 DEBUG(0, ("Out of memory!\n"));
 491                 return NT_STATUS_NO_MEMORY;
 492         }
 493
 494         status = idmap_autorid_db_init();
 495         if (!NT_STATUS_IS_OK(status)) {
 496                 goto error;
 497         }
 498
 499         config->minvalue = dom->low_id;
 500         config->rangesize = lp_parm_int(-1, "idmap config *", "rangesize", 100000);
 501
 502         if (config->rangesize < 2000) {
 503                 DEBUG(1, ("autorid rangesize must be at least 2000\n"));
 504                 status = NT_STATUS_INVALID_PARAMETER;
 505                 goto error;
 506         }
 507
 508         config->maxranges = (dom->high_id - dom->low_id + 1) /
 509             config->rangesize;
 510
 511         if (config->maxranges == 0) {
 512                 DEBUG(1, ("allowed uid range is smaller then rangesize, "
 513                           "increase uid range or decrease rangesize\n"));
 514                 status = NT_STATUS_INVALID_PARAMETER;
 515                 goto error;
 516         }
 517
 518         /* check if the high-low limit is a multiple of the rangesize */
 519         if ((dom->high_id - dom->low_id + 1) % config->rangesize != 0) {
 520                 DEBUG(5, ("High uid-low uid difference of %d "
 521                           "is not a multiple of the rangesize %d, "
 522                           "limiting ranges to lower boundary number of %d\n",
 523                           (dom->high_id - dom->low_id + 1), config->rangesize,
 524                           config->maxranges));
 525         }
 526
 527         DEBUG(10, ("Current configuration in config is "
 528                    "minvalue:%d rangesize:%d maxranges:%d\n",
 529                    config->minvalue, config->rangesize, config->maxranges));
 530
 531         /* read previously stored config and current HWM */
 532         storedconfig = idmap_autorid_loadconfig(talloc_tos());
 533
 534         status = dbwrap_fetch_uint32(autorid_db, HWM, &hwm);
 535         if (!NT_STATUS_IS_OK(status)) {
 536                 DEBUG(1, ("Fatal error while fetching current "
 537                           "HWM value: %s\n", nt_errstr(status)));
 538                 status = NT_STATUS_INTERNAL_ERROR;
 539                 goto error;
 540         }
 541
 542         /* did the minimum value or rangesize change? */
 543         if (storedconfig &&
 544             ((storedconfig->minvalue != config->minvalue) ||
 545              (storedconfig->rangesize != config->rangesize))) {
 546                 DEBUG(1, ("New configuration values for rangesize or "
 547                           "minimum uid value conflict with previously "
 548                           "used values! Aborting initialization\n"));
 549                 status = NT_STATUS_INVALID_PARAMETER;
 550                 goto error;
 551         }
 552
 553         /*
 554          * has the highest uid value been reduced to setting that is not
 555          * sufficient any more for already existing ranges?
 556          */
 557         if (hwm > config->maxranges) {
 558                 DEBUG(1, ("New upper uid limit is too low to cover "
 559                           "existing mappings! Aborting initialization\n"));
 560                 status = NT_STATUS_INVALID_PARAMETER;
 561                 goto error;
 562         }
 563
 564         status = idmap_autorid_saveconfig(config);
 565
 566         if (!NT_STATUS_IS_OK(status)) {
 567                 DEBUG(1, ("Failed to store configuration data!\n"));
 568                 goto error;
 569         }
 570
 571         DEBUG(5, ("%d domain ranges with a size of %d are available\n",
 572                   config->maxranges, config->rangesize));
 573
 574         dom->private_data = config;
 575
 576         goto done;
 577
 578 error:
 579         talloc_free(config);
 580
 581 done:
 582         talloc_free(storedconfig);
 583
 584         return status;
 585 }
 586
 587 static NTSTATUS idmap_autorid_allocate_id(struct idmap_domain *dom,
 588                                           struct unixid *xid) {
 589
 590         NTSTATUS ret;
 591         struct autorid_global_config *globalcfg;
 592         struct autorid_domain_config domaincfg;
 593         uint32_t hwm;
 594         const char *hwmkey;
 595
 596         if (!strequal(dom->name, "*")) {
 597                 DEBUG(3, ("idmap_autorid_allocate_id: "
 598                           "Refusing creation of mapping for domain'%s'. "
 599                           "Currently only supported for the default "
 600                           "domain \"*\".\n",
 601                            dom->name));
 602                 return NT_STATUS_NOT_IMPLEMENTED;
 603         }
 604
 605         if ((xid->type != ID_TYPE_UID) && (xid->type != ID_TYPE_GID)) {
 606                 return NT_STATUS_INVALID_PARAMETER;
 607         }
 608
 609
 610         globalcfg = talloc_get_type(dom->private_data,
 611                                     struct autorid_global_config);
 612
 613         /* fetch the range for the allocation pool */
 614
 615         ZERO_STRUCT(domaincfg);
 616
 617         domaincfg.globalcfg = globalcfg;
 618         fstrcpy(domaincfg.sid, ALLOC_RANGE);
 619
 620         ret = dbwrap_trans_do(autorid_db,
 621                               idmap_autorid_get_domainrange,
 622                               &domaincfg);
 623         if (!NT_STATUS_IS_OK(ret)) {
 624                 DEBUG(3, ("Could not determine range for allocation pool, "
 625                           "check previous messages for reason\n"));
 626                 return ret;
 627         }
 628
 629         /* fetch the current HWM */
 630         hwmkey = (xid->type==ID_TYPE_UID)?ALLOC_HWM_UID:ALLOC_HWM_GID;
 631
 632         ret = dbwrap_fetch_uint32(autorid_db, hwmkey, &hwm);
 633
 634         if (!NT_STATUS_IS_OK(ret)) {
 635                 DEBUG(1, ("Failed to fetch current allocation HWM value: %s\n",
 636                           nt_errstr(ret)));
 637                 return NT_STATUS_INTERNAL_ERROR;
 638         }
 639
 640         if (hwm >= globalcfg->rangesize) {
 641                 DEBUG(1, ("allocation range is depleted!\n"));
 642                 return NT_STATUS_NO_MEMORY;
 643         }
 644
 645         ret = dbwrap_change_uint32_atomic(autorid_db, hwmkey, &(xid->id), 1);
 646         if (!NT_STATUS_IS_OK(ret)) {
 647                 DEBUG(1, ("Fatal error while allocating new ID!\n"));
 648                 return ret;
 649         }
 650
 651         xid->id = globalcfg->minvalue +
 652                   globalcfg->rangesize * domaincfg.domainnum +
 653                   xid->id;
 654
 655         DEBUG(10, ("Returned new %s %d from allocation range\n",
 656                    (xid->type==ID_TYPE_UID)?"uid":"gid", xid->id));
 657
 658         return ret;
 659 }
 660
 661 /*
 662   Close the idmap tdb instance
 663 */
 664 static struct idmap_methods autorid_methods = {
 665         .init = idmap_autorid_initialize,
 666         .unixids_to_sids = idmap_autorid_unixids_to_sids,
 667         .sids_to_unixids = idmap_autorid_sids_to_unixids,
 668         .allocate_id     = idmap_autorid_allocate_id
 669 };
 670
 671 NTSTATUS samba_module_init(void)
 672 {
 673         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION,
 674                                   "autorid", &autorid_methods);
 675 }