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.h"
  29 #include "idmap.h"
  30 #include "../libcli/security/dom_sid.h"
  31 #include "util_tdb.h"
  32
  33 #undef DBGC_CLASS
  34 #define DBGC_CLASS DBGC_IDMAP
  35
  36 #define HWM "NEXT RANGE"
  37 #define ALLOC_HWM_UID "NEXT ALLOC UID"
  38 #define ALLOC_HWM_GID "NEXT ALLOC GID"
  39 #define ALLOC_RANGE "ALLOC"
  40 #define CONFIGKEY "CONFIG"
  41
  42 struct autorid_global_config {
  43         uint32_t minvalue;
  44         uint32_t rangesize;
  45         uint32_t maxranges;
  46 };
  47
  48 struct autorid_domain_config {
  49         fstring sid;
  50         uint32_t domainnum;
  51         struct autorid_global_config *globalcfg;
  52 };
  53
  54 /* handle to the tdb storing domain <-> range assignments */
  55 static struct db_context *autorid_db;
  56
  57 static NTSTATUS idmap_autorid_get_domainrange(struct db_context *db,
  58                                               void *private_data)
  59 {
  60         NTSTATUS ret;
  61         uint32_t domainnum, hwm;
  62         char *numstr;
  63         struct autorid_domain_config *cfg;
  64
  65         cfg = (struct autorid_domain_config *)private_data;
  66
  67         if (!dbwrap_fetch_uint32(db, cfg->sid, &domainnum)) {
  68                 DEBUG(10, ("Acquiring new range for domain %s\n", cfg->sid));
  69
  70                 /* fetch the current HWM */
  71                 if (!dbwrap_fetch_uint32(db, HWM, &hwm)) {
  72                         DEBUG(1, ("Fatal error while fetching current "
  73                                   "HWM value!\n"));
  74                         ret = NT_STATUS_INTERNAL_ERROR;
  75                         goto error;
  76                 }
  77
  78                 /* do we have a range left? */
  79                 if (hwm >= cfg->globalcfg->maxranges) {
  80                         DEBUG(1, ("No more domain ranges available!\n"));
  81                         ret = NT_STATUS_NO_MEMORY;
  82                         goto error;
  83                 }
  84
  85                 /* increase the HWM */
  86                 ret = dbwrap_change_uint32_atomic(db, HWM, &domainnum, 1);
  87                 if (!NT_STATUS_IS_OK(ret)) {
  88                         DEBUG(1, ("Fatal error while fetching a new "
  89                                   "domain range value!\n"));
  90                         goto error;
  91                 }
  92
  93                 /* store away the new mapping in both directions */
  94                 ret = dbwrap_trans_store_uint32(db, cfg->sid, domainnum);
  95                 if (!NT_STATUS_IS_OK(ret)) {
  96                         DEBUG(1, ("Fatal error while storing new "
  97                                   "domain->range assignment!\n"));
  98                         goto error;
  99                 }
 100
 101                 numstr = talloc_asprintf(db, "%u", domainnum);
 102                 if (!numstr) {
 103                         ret = NT_STATUS_NO_MEMORY;
 104                         goto error;
 105                 }
 106
 107                 ret = dbwrap_trans_store_bystring(db, numstr,
 108                                 string_term_tdb_data(cfg->sid), TDB_INSERT);
 109
 110                 talloc_free(numstr);
 111                 if (!NT_STATUS_IS_OK(ret)) {
 112                         DEBUG(1, ("Fatal error while storing "
 113                                   "new domain->range assignment!\n"));
 114                         goto error;
 115                 }
 116                 DEBUG(5, ("Acquired new range #%d for domain %s\n",
 117                           domainnum, cfg->sid));
 118         }
 119
 120         DEBUG(10, ("Using range #%d for domain %s\n", domainnum, cfg->sid));
 121         cfg->domainnum = domainnum;
 122
 123         return NT_STATUS_OK;
 124
 125       error:
 126         return ret;
 127
 128 }
 129
 130 static NTSTATUS idmap_autorid_id_to_sid(struct autorid_global_config *cfg,
 131                                         struct id_map *map)
 132 {
 133         uint32_t range;
 134         TDB_DATA data;
 135         char *keystr;
 136         struct dom_sid sid;
 137
 138         /* can this be one of our ids? */
 139         if (map->xid.id < cfg->minvalue) {
 140                 DEBUG(10, ("id %d is lower than minimum value, "
 141                            "ignoring mapping request\n", map->xid.id));
 142                 map->status = ID_UNKNOWN;
 143                 return NT_STATUS_OK;
 144         }
 145
 146         if (map->xid.id > (cfg->minvalue + cfg->rangesize * cfg->maxranges)) {
 147                 DEBUG(10, ("id %d is outside of maximum id value, "
 148                            "ignoring mapping request\n", map->xid.id));
 149                 map->status = ID_UNKNOWN;
 150                 return NT_STATUS_OK;
 151         }
 152
 153         /* determine the range of this uid */
 154         range = ((map->xid.id - cfg->minvalue) / cfg->rangesize);
 155
 156         keystr = talloc_asprintf(talloc_tos(), "%u", range);
 157         if (!keystr) {
 158                 return NT_STATUS_NO_MEMORY;
 159         }
 160
 161         data = dbwrap_fetch_bystring(autorid_db, talloc_tos(), keystr);
 162         TALLOC_FREE(keystr);
 163
 164         if (!data.dptr) {
 165                 DEBUG(4, ("id %d belongs to range %d which does not have "
 166                           "domain mapping, ignoring mapping request\n",
 167                           map->xid.id, range));
 168                 TALLOC_FREE(data.dptr);
 169                 map->status = ID_UNKNOWN;
 170                 return NT_STATUS_OK;
 171         }
 172
 173         if (strncmp((const char *)data.dptr,
 174                     ALLOC_RANGE,
 175                     strlen(ALLOC_RANGE)) == 0) {
 176                 /* this is from the alloc range, there is no mapping back */
 177                 DEBUG(5, ("id %d belongs to alloc range, cannot map back\n",
 178                           map->xid.id));
 179                 TALLOC_FREE(data.dptr);
 180                 map->status = ID_UNKNOWN;
 181                 return NT_STATUS_OK;
 182         }
 183
 184         string_to_sid(&sid, (const char *)data.dptr);
 185         TALLOC_FREE(data.dptr);
 186
 187         sid_compose(map->sid, &sid,
 188                     (map->xid.id - cfg->minvalue -
 189                      range * cfg->rangesize));
 190
 191         /* We **really** should have some way of validating
 192            the SID exists and is the correct type here.  But
 193            that is a deficiency in the idmap_rid design. */
 194
 195         map->status = ID_MAPPED;
 196         return NT_STATUS_OK;
 197 }
 198
 199 /**********************************
 200  Single sid to id lookup function.
 201 **********************************/
 202
 203 static NTSTATUS idmap_autorid_sid_to_id(struct autorid_global_config *global,
 204                                         struct autorid_domain_config *domain,
 205                                         struct id_map *map)
 206 {
 207         uint32_t rid;
 208
 209         sid_peek_rid(map->sid, &rid);
 210
 211         /* if the rid is higher than the size of the range, we cannot map it */
 212         if (rid >= global->rangesize) {
 213                 map->status = ID_UNKNOWN;
 214                 DEBUG(2, ("RID %d is larger then size of range (%d), "
 215                           "user cannot be mapped\n", rid, global->rangesize));
 216                 return NT_STATUS_UNSUCCESSFUL;
 217         }
 218         map->xid.id = global->minvalue +
 219             (global->rangesize * domain->domainnum)+rid;
 220
 221         /* We **really** should have some way of validating
 222            the SID exists and is the correct type here.  But
 223            that is a deficiency in the idmap_rid design. */
 224
 225         map->status = ID_MAPPED;
 226
 227         return NT_STATUS_OK;
 228 }
 229
 230 /**********************************
 231  lookup a set of unix ids.
 232 **********************************/
 233
 234 static NTSTATUS idmap_autorid_unixids_to_sids(struct idmap_domain *dom,
 235                                               struct id_map **ids)
 236 {
 237         struct autorid_global_config *globalcfg;
 238         NTSTATUS ret;
 239         int i;
 240
 241         /* initialize the status to avoid surprise */
 242         for (i = 0; ids[i]; i++) {
 243                 ids[i]->status = ID_UNKNOWN;
 244         }
 245
 246         globalcfg = talloc_get_type(dom->private_data,
 247                                     struct autorid_global_config);
 248
 249         for (i = 0; ids[i]; i++) {
 250
 251                 ret = idmap_autorid_id_to_sid(globalcfg, ids[i]);
 252
 253                 if ((!NT_STATUS_IS_OK(ret)) &&
 254                     (!NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
 255                         /* some fatal error occurred, log it */
 256                         DEBUG(3, ("Unexpected error resolving an ID "
 257                                   " (%d)\n", ids[i]->xid.id));
 258                         goto failure;
 259                 }
 260         }
 261         return NT_STATUS_OK;
 262
 263       failure:
 264         return ret;
 265 }
 266
 267 /**********************************
 268  lookup a set of sids.
 269 **********************************/
 270
 271 static NTSTATUS idmap_autorid_sids_to_unixids(struct idmap_domain *dom,
 272                                               struct id_map **ids)
 273 {
 274         struct autorid_global_config *global;
 275         NTSTATUS ret;
 276         int i;
 277
 278         /* initialize the status to avoid surprise */
 279         for (i = 0; ids[i]; i++) {
 280                 ids[i]->status = ID_UNKNOWN;
 281         }
 282
 283         global = talloc_get_type(dom->private_data,
 284                                  struct autorid_global_config);
 285
 286         for (i = 0; ids[i]; i++) {
 287                 struct winbindd_tdc_domain *domain;
 288                 struct autorid_domain_config domaincfg;
 289                 uint32_t rid;
 290                 struct dom_sid domainsid;
 291
 292                 ZERO_STRUCT(domaincfg);
 293
 294                 sid_copy(&domainsid, ids[i]->sid);
 295                 if (!sid_split_rid(&domainsid, &rid)) {
 296                         DEBUG(4, ("Could not determine domain SID from %s, "
 297                                   "ignoring mapping request\n",
 298                                   sid_string_dbg(ids[i]->sid)));
 299                         continue;
 300                 }
 301
 302                 /*
 303                  * Check if the domain is around
 304                  */
 305                 domain = wcache_tdc_fetch_domainbysid(talloc_tos(),
 306                                                       &domainsid);
 307                 if (domain == NULL) {
 308                         DEBUG(10, ("Ignoring unknown domain sid %s\n",
 309                                    sid_string_dbg(&domainsid)));
 310                         continue;
 311                 }
 312                 TALLOC_FREE(domain);
 313
 314                 domaincfg.globalcfg = global;
 315                 sid_to_fstring(domaincfg.sid, &domainsid);
 316
 317                 ret = dbwrap_trans_do(autorid_db,
 318                                       idmap_autorid_get_domainrange,
 319                                       &domaincfg);
 320
 321                 if (!NT_STATUS_IS_OK(ret)) {
 322                         DEBUG(3, ("Could not determine range for domain, "
 323                                   "check previous messages for reason\n"));
 324                         goto failure;
 325                 }
 326
 327                 ret = idmap_autorid_sid_to_id(global, &domaincfg, ids[i]);
 328
 329                 if ((!NT_STATUS_IS_OK(ret)) &&
 330                     (!NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
 331                         /* some fatal error occurred, log it */
 332                         DEBUG(3, ("Unexpected error resolving a SID (%s)\n",
 333                                   sid_string_dbg(ids[i]->sid)));
 334                         goto failure;
 335                 }
 336         }
 337         return NT_STATUS_OK;
 338
 339       failure:
 340         return ret;
 341
 342 }
 343
 344 /* initialize the given HWM to 0 if it does not exist yet */
 345 static NTSTATUS idmap_autorid_init_hwm(const char *hwm) {
 346
 347         NTSTATUS status;
 348         int32_t hwmval;
 349
 350         hwmval = dbwrap_fetch_int32(autorid_db, hwm);
 351         if ((hwmval < 0))  {
 352                 status = dbwrap_trans_store_int32(autorid_db, hwm, 0);
 353                 if (!NT_STATUS_IS_OK(status)) {
 354                         DEBUG(0,
 355                               ("Unable to initialise HWM (%s) in autorid "
 356                                "database: %s\n", hwm, nt_errstr(status)));
 357                         return NT_STATUS_INTERNAL_DB_ERROR;
 358                 }
 359         }
 360
 361         return NT_STATUS_OK;
 362 }
 363
 364 /*
 365  * open and initialize the database which stores the ranges for the domains
 366  */
 367 static NTSTATUS idmap_autorid_db_init(void)
 368 {
 369         NTSTATUS status;
 370
 371         if (autorid_db) {
 372                 /* its already open */
 373                 return NT_STATUS_OK;
 374         }
 375
 376         /* Open idmap repository */
 377         autorid_db = db_open(NULL, state_path("autorid.tdb"), 0,
 378                              TDB_DEFAULT, O_RDWR | O_CREAT, 0644);
 379
 380         if (!autorid_db) {
 381                 DEBUG(0, ("Unable to open idmap_autorid database '%s'\n",
 382                           state_path("autorid.tdb")));
 383                 return NT_STATUS_UNSUCCESSFUL;
 384         }
 385
 386         /* Initialize high water mark for the currently used range to 0 */
 387
 388         status = idmap_autorid_init_hwm(HWM);
 389         NT_STATUS_NOT_OK_RETURN(status);
 390
 391         status = idmap_autorid_init_hwm(ALLOC_HWM_UID);
 392         NT_STATUS_NOT_OK_RETURN(status);
 393
 394         status = idmap_autorid_init_hwm(ALLOC_HWM_GID);
 395
 396         return status;
 397 }
 398
 399 static struct autorid_global_config *idmap_autorid_loadconfig(TALLOC_CTX * ctx)
 400 {
 401
 402         TDB_DATA data;
 403         struct autorid_global_config *cfg;
 404         unsigned long minvalue, rangesize, maxranges;
 405
 406         data = dbwrap_fetch_bystring(autorid_db, ctx, CONFIGKEY);
 407
 408         if (!data.dptr) {
 409                 DEBUG(10, ("No saved config found\n"));
 410                 return NULL;
 411         }
 412
 413         cfg = TALLOC_ZERO_P(ctx, struct autorid_global_config);
 414         if (!cfg) {
 415                 return NULL;
 416         }
 417
 418         if (sscanf((char *)data.dptr,
 419                    "minvalue:%lu rangesize:%lu maxranges:%lu",
 420                    &minvalue, &rangesize, &maxranges) != 3) {
 421                 DEBUG(1,
 422                       ("Found invalid configuration data"
 423                        "creating new config\n"));
 424                 return NULL;
 425         }
 426
 427         cfg->minvalue = minvalue;
 428         cfg->rangesize = rangesize;
 429         cfg->maxranges = maxranges;
 430
 431         DEBUG(10, ("Loaded previously stored configuration "
 432                    "minvalue:%d rangesize:%d\n",
 433                    cfg->minvalue, cfg->rangesize));
 434
 435         return cfg;
 436
 437 }
 438
 439 static NTSTATUS idmap_autorid_saveconfig(struct autorid_global_config *cfg)
 440 {
 441
 442         NTSTATUS status;
 443         TDB_DATA data;
 444         char *cfgstr;
 445
 446         cfgstr =
 447             talloc_asprintf(talloc_tos(),
 448                             "minvalue:%u rangesize:%u maxranges:%u",
 449                             cfg->minvalue, cfg->rangesize, cfg->maxranges);
 450
 451         if (!cfgstr) {
 452                 return NT_STATUS_NO_MEMORY;
 453         }
 454
 455         data = string_tdb_data(cfgstr);
 456
 457         status = dbwrap_trans_store_bystring(autorid_db, CONFIGKEY,
 458                                              data, TDB_REPLACE);
 459
 460         talloc_free(cfgstr);
 461
 462         return status;
 463 }
 464
 465 static NTSTATUS idmap_autorid_initialize(struct idmap_domain *dom)
 466 {
 467         struct autorid_global_config *config;
 468         struct autorid_global_config *storedconfig = NULL;
 469         NTSTATUS status;
 470         uint32_t hwm;
 471
 472         if (!strequal(dom->name, "*")) {
 473                 DEBUG(0, ("idmap_autorid_initialize: Error: autorid configured "
 474                           "for domain '%s'. But autorid can only be used for "
 475                           "the default idmap configuration.\n", dom->name));
 476                 return NT_STATUS_INVALID_PARAMETER;
 477         }
 478
 479         config = TALLOC_ZERO_P(dom, struct autorid_global_config);
 480         if (!config) {
 481                 DEBUG(0, ("Out of memory!\n"));
 482                 return NT_STATUS_NO_MEMORY;
 483         }
 484
 485         status = idmap_autorid_db_init();
 486         if (!NT_STATUS_IS_OK(status)) {
 487                 goto error;
 488         }
 489
 490         config->minvalue = dom->low_id;
 491         config->rangesize = lp_parm_int(-1, "idmap config *", "rangesize", 100000);
 492
 493         if (config->rangesize < 2000) {
 494                 DEBUG(1, ("autorid rangesize must be at least 2000\n"));
 495                 status = NT_STATUS_INVALID_PARAMETER;
 496                 goto error;
 497         }
 498
 499         config->maxranges = (dom->high_id - dom->low_id + 1) /
 500             config->rangesize;
 501
 502         if (config->maxranges == 0) {
 503                 DEBUG(1, ("allowed uid range is smaller then rangesize, "
 504                           "increase uid range or decrease rangesize\n"));
 505                 status = NT_STATUS_INVALID_PARAMETER;
 506                 goto error;
 507         }
 508
 509         /* check if the high-low limit is a multiple of the rangesize */
 510         if ((dom->high_id - dom->low_id + 1) % config->rangesize != 0) {
 511                 DEBUG(5, ("High uid-low uid difference of %d "
 512                           "is not a multiple of the rangesize %d, "
 513                           "limiting ranges to lower boundary number of %d\n",
 514                           (dom->high_id - dom->low_id + 1), config->rangesize,
 515                           config->maxranges));
 516         }
 517
 518         DEBUG(10, ("Current configuration in config is "
 519                    "minvalue:%d rangesize:%d maxranges:%d\n",
 520                    config->minvalue, config->rangesize, config->maxranges));
 521
 522         /* read previously stored config and current HWM */
 523         storedconfig = idmap_autorid_loadconfig(talloc_tos());
 524
 525         if (!dbwrap_fetch_uint32(autorid_db, HWM, &hwm)) {
 526                 DEBUG(1, ("Fatal error while fetching current "
 527                           "HWM value!\n"));
 528                 status = NT_STATUS_INTERNAL_ERROR;
 529                 goto error;
 530         }
 531
 532         /* did the minimum value or rangesize change? */
 533         if (storedconfig &&
 534             ((storedconfig->minvalue != config->minvalue) ||
 535              (storedconfig->rangesize != config->rangesize))) {
 536                 DEBUG(1, ("New configuration values for rangesize or "
 537                           "minimum uid value conflict with previously "
 538                           "used values! Aborting initialization\n"));
 539                 status = NT_STATUS_INVALID_PARAMETER;
 540                 goto error;
 541         }
 542
 543         /*
 544          * has the highest uid value been reduced to setting that is not
 545          * sufficient any more for already existing ranges?
 546          */
 547         if (hwm > config->maxranges) {
 548                 DEBUG(1, ("New upper uid limit is too low to cover "
 549                           "existing mappings! Aborting initialization\n"));
 550                 status = NT_STATUS_INVALID_PARAMETER;
 551                 goto error;
 552         }
 553
 554         status = idmap_autorid_saveconfig(config);
 555
 556         if (!NT_STATUS_IS_OK(status)) {
 557                 DEBUG(1, ("Failed to store configuration data!\n"));
 558                 goto error;
 559         }
 560
 561         DEBUG(5, ("%d domain ranges with a size of %d are available\n",
 562                   config->maxranges, config->rangesize));
 563
 564         dom->private_data = config;
 565
 566         goto done;
 567
 568 error:
 569         talloc_free(config);
 570
 571 done:
 572         talloc_free(storedconfig);
 573
 574         return status;
 575 }
 576
 577 static NTSTATUS idmap_autorid_allocate_id(struct idmap_domain *dom,
 578                                           struct unixid *xid) {
 579
 580         NTSTATUS ret;
 581         struct autorid_global_config *globalcfg;
 582         struct autorid_domain_config domaincfg;
 583         uint32_t hwm;
 584         const char *hwmkey;
 585
 586         if (!strequal(dom->name, "*")) {
 587                 DEBUG(3, ("idmap_autorid_allocate_id: "
 588                           "Refusing creation of mapping for domain'%s'. "
 589                           "Currently only supported for the default "
 590                           "domain \"*\".\n",
 591                            dom->name));
 592                 return NT_STATUS_NOT_IMPLEMENTED;
 593         }
 594
 595         if ((xid->type != ID_TYPE_UID) && (xid->type != ID_TYPE_GID)) {
 596                 return NT_STATUS_INVALID_PARAMETER;
 597         }
 598
 599
 600         globalcfg = talloc_get_type(dom->private_data,
 601                                     struct autorid_global_config);
 602
 603         /* fetch the range for the allocation pool */
 604
 605         ZERO_STRUCT(domaincfg);
 606
 607         domaincfg.globalcfg = globalcfg;
 608         fstrcpy(domaincfg.sid, ALLOC_RANGE);
 609
 610         ret = dbwrap_trans_do(autorid_db,
 611                               idmap_autorid_get_domainrange,
 612                               &domaincfg);
 613         if (!NT_STATUS_IS_OK(ret)) {
 614                 DEBUG(3, ("Could not determine range for allocation pool, "
 615                           "check previous messages for reason\n"));
 616                 return ret;
 617         }
 618
 619         /* fetch the current HWM */
 620         hwmkey = (xid->type==ID_TYPE_UID)?ALLOC_HWM_UID:ALLOC_HWM_GID;
 621
 622         if (!dbwrap_fetch_uint32(autorid_db, hwmkey, &hwm)) {
 623                 DEBUG(1, ("Failed to fetch current allocation HWM value: %s\n",
 624                           nt_errstr(ret)));
 625                 return NT_STATUS_INTERNAL_ERROR;
 626         }
 627
 628         if (hwm >= globalcfg->rangesize) {
 629                 DEBUG(1, ("allocation range is depleted!\n"));
 630                 return NT_STATUS_NO_MEMORY;
 631         }
 632
 633         ret = dbwrap_change_uint32_atomic(autorid_db, hwmkey, &(xid->id), 1);
 634         if (!NT_STATUS_IS_OK(ret)) {
 635                 DEBUG(1, ("Fatal error while allocating new ID!\n"));
 636                 return ret;
 637         }
 638
 639         xid->id = globalcfg->minvalue +
 640                   globalcfg->rangesize * domaincfg.domainnum +
 641                   xid->id;
 642
 643         DEBUG(10, ("Returned new %s %d from allocation range\n",
 644                    (xid->type==ID_TYPE_UID)?"uid":"gid", xid->id));
 645
 646         return ret;
 647 }
 648
 649 /*
 650   Close the idmap tdb instance
 651 */
 652 static struct idmap_methods autorid_methods = {
 653         .init = idmap_autorid_initialize,
 654         .unixids_to_sids = idmap_autorid_unixids_to_sids,
 655         .sids_to_unixids = idmap_autorid_sids_to_unixids,
 656         .allocate_id     = idmap_autorid_allocate_id
 657 };
 658
 659 NTSTATUS idmap_autorid_init(void)
 660 {
 661         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION,
 662                                   "autorid", &autorid_methods);
 663 }