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_action(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, &(cfg->domainnum));
  69
  70         if (NT_STATUS_IS_OK(ret)) {
  71                 /* entry is already present*/
  72                 return ret;
  73         }
  74
  75         DEBUG(10, ("Acquiring new range for domain %s\n", cfg->sid));
  76
  77         /* fetch the current HWM */
  78         ret = dbwrap_fetch_uint32(db, HWM, &hwm);
  79         if (!NT_STATUS_IS_OK(ret)) {
  80                 DEBUG(1, ("Fatal error while fetching current "
  81                           "HWM value: %s\n", nt_errstr(ret)));
  82                 ret = NT_STATUS_INTERNAL_ERROR;
  83                 goto error;
  84         }
  85
  86         /* do we have a range left? */
  87         if (hwm >= cfg->globalcfg->maxranges) {
  88                 DEBUG(1, ("No more domain ranges available!\n"));
  89                 ret = NT_STATUS_NO_MEMORY;
  90                 goto error;
  91         }
  92
  93         /* increase the HWM */
  94         ret = dbwrap_change_uint32_atomic(db, HWM, &domainnum, 1);
  95         if (!NT_STATUS_IS_OK(ret)) {
  96                 DEBUG(1, ("Fatal error while fetching a new "
  97                           "domain range value!\n"));
  98                 goto error;
  99         }
 100
 101         /* store away the new mapping in both directions */
 102         ret = dbwrap_store_uint32(db, cfg->sid, domainnum);
 103         if (!NT_STATUS_IS_OK(ret)) {
 104                 DEBUG(1, ("Fatal error while storing new "
 105                           "domain->range assignment!\n"));
 106                 goto error;
 107         }
 108
 109         numstr = talloc_asprintf(db, "%u", domainnum);
 110         if (!numstr) {
 111                 ret = NT_STATUS_NO_MEMORY;
 112                 goto error;
 113         }
 114
 115         ret = dbwrap_store_bystring(db, numstr,
 116                         string_term_tdb_data(cfg->sid), TDB_INSERT);
 117
 118         talloc_free(numstr);
 119         if (!NT_STATUS_IS_OK(ret)) {
 120                 DEBUG(1, ("Fatal error while storing "
 121                           "new domain->range assignment!\n"));
 122                 goto error;
 123         }
 124         DEBUG(5, ("Acquired new range #%d for domain %s\n",
 125                   domainnum, cfg->sid));
 126
 127         cfg->domainnum = domainnum;
 128
 129         return NT_STATUS_OK;
 130
 131 error:
 132         return ret;
 133
 134 }
 135
 136 static NTSTATUS idmap_autorid_get_domainrange(struct autorid_domain_config *dom)
 137 {
 138         NTSTATUS ret;
 139
 140         /*
 141          * try to find mapping without locking the database,
 142          * if it is not found create a mapping in a transaction
 143          */
 144         ret = dbwrap_fetch_uint32(autorid_db, dom->sid, &(dom->domainnum));
 145
 146         if (!NT_STATUS_IS_OK(ret)) {;
 147                 ret = dbwrap_trans_do(autorid_db,
 148                               idmap_autorid_get_domainrange_action, dom);
 149         }
 150
 151         DEBUG(10, ("Using range #%d for domain %s\n", dom->domainnum,
 152                    dom->sid));
 153
 154         return ret;
 155 }
 156
 157 static NTSTATUS idmap_autorid_id_to_sid(struct autorid_global_config *cfg,
 158                                         struct id_map *map)
 159 {
 160         uint32_t range;
 161         TDB_DATA data;
 162         char *keystr;
 163         struct dom_sid sid;
 164         NTSTATUS status;
 165
 166         /* can this be one of our ids? */
 167         if (map->xid.id < cfg->minvalue) {
 168                 DEBUG(10, ("id %d is lower than minimum value, "
 169                            "ignoring mapping request\n", map->xid.id));
 170                 map->status = ID_UNKNOWN;
 171                 return NT_STATUS_OK;
 172         }
 173
 174         if (map->xid.id > (cfg->minvalue + cfg->rangesize * cfg->maxranges)) {
 175                 DEBUG(10, ("id %d is outside of maximum id value, "
 176                            "ignoring mapping request\n", map->xid.id));
 177                 map->status = ID_UNKNOWN;
 178                 return NT_STATUS_OK;
 179         }
 180
 181         /* determine the range of this uid */
 182         range = ((map->xid.id - cfg->minvalue) / cfg->rangesize);
 183
 184         keystr = talloc_asprintf(talloc_tos(), "%u", range);
 185         if (!keystr) {
 186                 return NT_STATUS_NO_MEMORY;
 187         }
 188
 189         status = dbwrap_fetch_bystring(autorid_db, talloc_tos(), keystr, &data);
 190         TALLOC_FREE(keystr);
 191
 192         if (!NT_STATUS_IS_OK(status)) {
 193                 DEBUG(4, ("id %d belongs to range %d which does not have "
 194                           "domain mapping, ignoring mapping request\n",
 195                           map->xid.id, range));
 196                 TALLOC_FREE(data.dptr);
 197                 map->status = ID_UNKNOWN;
 198                 return NT_STATUS_OK;
 199         }
 200
 201         if (strncmp((const char *)data.dptr,
 202                     ALLOC_RANGE,
 203                     strlen(ALLOC_RANGE)) == 0) {
 204                 /* this is from the alloc range, there is no mapping back */
 205                 DEBUG(5, ("id %d belongs to alloc range, cannot map back\n",
 206                           map->xid.id));
 207                 TALLOC_FREE(data.dptr);
 208                 map->status = ID_UNKNOWN;
 209                 return NT_STATUS_OK;
 210         }
 211
 212         string_to_sid(&sid, (const char *)data.dptr);
 213         TALLOC_FREE(data.dptr);
 214
 215         sid_compose(map->sid, &sid,
 216                     (map->xid.id - cfg->minvalue -
 217                      range * cfg->rangesize));
 218
 219         /* We **really** should have some way of validating
 220            the SID exists and is the correct type here.  But
 221            that is a deficiency in the idmap_rid design. */
 222
 223         map->status = ID_MAPPED;
 224         return NT_STATUS_OK;
 225 }
 226
 227 /**********************************
 228  Single sid to id lookup function.
 229 **********************************/
 230
 231 static NTSTATUS idmap_autorid_sid_to_id(struct autorid_global_config *global,
 232                                         struct autorid_domain_config *domain,
 233                                         struct id_map *map)
 234 {
 235         uint32_t rid;
 236
 237         sid_peek_rid(map->sid, &rid);
 238
 239         /* if the rid is higher than the size of the range, we cannot map it */
 240         if (rid >= global->rangesize) {
 241                 map->status = ID_UNKNOWN;
 242                 DEBUG(2, ("RID %d is larger then size of range (%d), "
 243                           "user cannot be mapped\n", rid, global->rangesize));
 244                 return NT_STATUS_UNSUCCESSFUL;
 245         }
 246         map->xid.id = global->minvalue +
 247             (global->rangesize * domain->domainnum)+rid;
 248
 249         /* We **really** should have some way of validating
 250            the SID exists and is the correct type here.  But
 251            that is a deficiency in the idmap_rid design. */
 252
 253         map->status = ID_MAPPED;
 254
 255         return NT_STATUS_OK;
 256 }
 257
 258 /**********************************
 259  lookup a set of unix ids.
 260 **********************************/
 261
 262 static NTSTATUS idmap_autorid_unixids_to_sids(struct idmap_domain *dom,
 263                                               struct id_map **ids)
 264 {
 265         struct autorid_global_config *globalcfg;
 266         NTSTATUS ret;
 267         int i;
 268
 269         /* initialize the status to avoid surprise */
 270         for (i = 0; ids[i]; i++) {
 271                 ids[i]->status = ID_UNKNOWN;
 272         }
 273
 274         globalcfg = talloc_get_type(dom->private_data,
 275                                     struct autorid_global_config);
 276
 277         for (i = 0; ids[i]; i++) {
 278
 279                 ret = idmap_autorid_id_to_sid(globalcfg, ids[i]);
 280
 281                 if ((!NT_STATUS_IS_OK(ret)) &&
 282                     (!NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
 283                         /* some fatal error occurred, log it */
 284                         DEBUG(3, ("Unexpected error resolving an ID "
 285                                   " (%d)\n", ids[i]->xid.id));
 286                         goto failure;
 287                 }
 288         }
 289         return NT_STATUS_OK;
 290
 291       failure:
 292         return ret;
 293 }
 294
 295 /**********************************
 296  lookup a set of sids.
 297 **********************************/
 298
 299 static NTSTATUS idmap_autorid_sids_to_unixids(struct idmap_domain *dom,
 300                                               struct id_map **ids)
 301 {
 302         struct autorid_global_config *global;
 303         NTSTATUS ret;
 304         int i;
 305
 306         /* initialize the status to avoid surprise */
 307         for (i = 0; ids[i]; i++) {
 308                 ids[i]->status = ID_UNKNOWN;
 309         }
 310
 311         global = talloc_get_type(dom->private_data,
 312                                  struct autorid_global_config);
 313
 314         for (i = 0; ids[i]; i++) {
 315                 struct winbindd_tdc_domain *domain;
 316                 struct autorid_domain_config domaincfg;
 317                 uint32_t rid;
 318                 struct dom_sid domainsid;
 319
 320                 ZERO_STRUCT(domaincfg);
 321
 322                 sid_copy(&domainsid, ids[i]->sid);
 323                 if (!sid_split_rid(&domainsid, &rid)) {
 324                         DEBUG(4, ("Could not determine domain SID from %s, "
 325                                   "ignoring mapping request\n",
 326                                   sid_string_dbg(ids[i]->sid)));
 327                         continue;
 328                 }
 329
 330                 /*
 331                  * Check if the domain is around
 332                  */
 333                 domain = wcache_tdc_fetch_domainbysid(talloc_tos(),
 334                                                       &domainsid);
 335                 if (domain == NULL) {
 336                         DEBUG(10, ("Ignoring unknown domain sid %s\n",
 337                                    sid_string_dbg(&domainsid)));
 338                         continue;
 339                 }
 340                 TALLOC_FREE(domain);
 341
 342                 domaincfg.globalcfg = global;
 343                 sid_to_fstring(domaincfg.sid, &domainsid);
 344
 345                 ret = idmap_autorid_get_domainrange(&domaincfg);
 346
 347                 if (!NT_STATUS_IS_OK(ret)) {
 348                         DEBUG(3, ("Could not determine range for domain, "
 349                                   "check previous messages for reason\n"));
 350                         goto failure;
 351                 }
 352
 353                 ret = idmap_autorid_sid_to_id(global, &domaincfg, ids[i]);
 354
 355                 if ((!NT_STATUS_IS_OK(ret)) &&
 356                     (!NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
 357                         /* some fatal error occurred, log it */
 358                         DEBUG(3, ("Unexpected error resolving a SID (%s)\n",
 359                                   sid_string_dbg(ids[i]->sid)));
 360                         goto failure;
 361                 }
 362         }
 363         return NT_STATUS_OK;
 364
 365       failure:
 366         return ret;
 367
 368 }
 369
 370 /* initialize the given HWM to 0 if it does not exist yet */
 371 static NTSTATUS idmap_autorid_init_hwm(const char *hwm) {
 372
 373         NTSTATUS status;
 374         uint32_t hwmval;
 375
 376         status = dbwrap_fetch_uint32(autorid_db, hwm, &hwmval);
 377         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND))  {
 378                 status = dbwrap_trans_store_int32(autorid_db, hwm, 0);
 379                 if (!NT_STATUS_IS_OK(status)) {
 380                         DEBUG(0,
 381                               ("Unable to initialise HWM (%s) in autorid "
 382                                "database: %s\n", hwm, nt_errstr(status)));
 383                         return NT_STATUS_INTERNAL_DB_ERROR;
 384                 }
 385         } else if (!NT_STATUS_IS_OK(status)) {
 386                 DEBUG(0, ("unable to fetch HWM (%s) from autorid "
 387                           "database: %s\n", hwm,  nt_errstr(status)));
 388                 return status;
 389         }
 390
 391         return NT_STATUS_OK;
 392 }
 393
 394 /*
 395  * open and initialize the database which stores the ranges for the domains
 396  */
 397 static NTSTATUS idmap_autorid_db_init(void)
 398 {
 399         NTSTATUS status;
 400
 401         if (autorid_db) {
 402                 /* its already open */
 403                 return NT_STATUS_OK;
 404         }
 405
 406         /* Open idmap repository */
 407         autorid_db = db_open(NULL, state_path("autorid.tdb"), 0,
 408                              TDB_DEFAULT, O_RDWR | O_CREAT, 0644,
 409                              DBWRAP_LOCK_ORDER_1);
 410
 411         if (!autorid_db) {
 412                 DEBUG(0, ("Unable to open idmap_autorid database '%s'\n",
 413                           state_path("autorid.tdb")));
 414                 return NT_STATUS_UNSUCCESSFUL;
 415         }
 416
 417         /* Initialize high water mark for the currently used range to 0 */
 418
 419         status = idmap_autorid_init_hwm(HWM);
 420         NT_STATUS_NOT_OK_RETURN(status);
 421
 422         status = idmap_autorid_init_hwm(ALLOC_HWM_UID);
 423         NT_STATUS_NOT_OK_RETURN(status);
 424
 425         status = idmap_autorid_init_hwm(ALLOC_HWM_GID);
 426
 427         return status;
 428 }
 429
 430 static struct autorid_global_config *idmap_autorid_loadconfig(TALLOC_CTX * ctx)
 431 {
 432
 433         TDB_DATA data;
 434         struct autorid_global_config *cfg;
 435         unsigned long minvalue, rangesize, maxranges;
 436         NTSTATUS status;
 437
 438         status = dbwrap_fetch_bystring(autorid_db, ctx, CONFIGKEY, &data);
 439
 440         if (!NT_STATUS_IS_OK(status)) {
 441                 DEBUG(10, ("No saved config found\n"));
 442                 return NULL;
 443         }
 444
 445         cfg = talloc_zero(ctx, struct autorid_global_config);
 446         if (!cfg) {
 447                 return NULL;
 448         }
 449
 450         if (sscanf((char *)data.dptr,
 451                    "minvalue:%lu rangesize:%lu maxranges:%lu",
 452                    &minvalue, &rangesize, &maxranges) != 3) {
 453                 DEBUG(1,
 454                       ("Found invalid configuration data"
 455                        "creating new config\n"));
 456                 return NULL;
 457         }
 458
 459         cfg->minvalue = minvalue;
 460         cfg->rangesize = rangesize;
 461         cfg->maxranges = maxranges;
 462
 463         DEBUG(10, ("Loaded previously stored configuration "
 464                    "minvalue:%d rangesize:%d\n",
 465                    cfg->minvalue, cfg->rangesize));
 466
 467         return cfg;
 468
 469 }
 470
 471 static NTSTATUS idmap_autorid_saveconfig(struct autorid_global_config *cfg)
 472 {
 473
 474         NTSTATUS status;
 475         TDB_DATA data;
 476         char *cfgstr;
 477
 478         cfgstr =
 479             talloc_asprintf(talloc_tos(),
 480                             "minvalue:%u rangesize:%u maxranges:%u",
 481                             cfg->minvalue, cfg->rangesize, cfg->maxranges);
 482
 483         if (!cfgstr) {
 484                 return NT_STATUS_NO_MEMORY;
 485         }
 486
 487         data = string_tdb_data(cfgstr);
 488
 489         status = dbwrap_trans_store_bystring(autorid_db, CONFIGKEY,
 490                                              data, TDB_REPLACE);
 491
 492         talloc_free(cfgstr);
 493
 494         return status;
 495 }
 496
 497 static NTSTATUS idmap_autorid_initialize(struct idmap_domain *dom)
 498 {
 499         struct autorid_global_config *config;
 500         struct autorid_global_config *storedconfig = NULL;
 501         NTSTATUS status;
 502         uint32_t hwm;
 503
 504         if (!strequal(dom->name, "*")) {
 505                 DEBUG(0, ("idmap_autorid_initialize: Error: autorid configured "
 506                           "for domain '%s'. But autorid can only be used for "
 507                           "the default idmap configuration.\n", dom->name));
 508                 return NT_STATUS_INVALID_PARAMETER;
 509         }
 510
 511         config = talloc_zero(dom, struct autorid_global_config);
 512         if (!config) {
 513                 DEBUG(0, ("Out of memory!\n"));
 514                 return NT_STATUS_NO_MEMORY;
 515         }
 516
 517         status = idmap_autorid_db_init();
 518         if (!NT_STATUS_IS_OK(status)) {
 519                 goto error;
 520         }
 521
 522         config->minvalue = dom->low_id;
 523         config->rangesize = lp_parm_int(-1, "idmap config *", "rangesize", 100000);
 524
 525         if (config->rangesize < 2000) {
 526                 DEBUG(1, ("autorid rangesize must be at least 2000\n"));
 527                 status = NT_STATUS_INVALID_PARAMETER;
 528                 goto error;
 529         }
 530
 531         config->maxranges = (dom->high_id - dom->low_id + 1) /
 532             config->rangesize;
 533
 534         if (config->maxranges == 0) {
 535                 DEBUG(1, ("allowed uid range is smaller then rangesize, "
 536                           "increase uid range or decrease rangesize\n"));
 537                 status = NT_STATUS_INVALID_PARAMETER;
 538                 goto error;
 539         }
 540
 541         /* check if the high-low limit is a multiple of the rangesize */
 542         if ((dom->high_id - dom->low_id + 1) % config->rangesize != 0) {
 543                 DEBUG(5, ("High uid-low uid difference of %d "
 544                           "is not a multiple of the rangesize %d, "
 545                           "limiting ranges to lower boundary number of %d\n",
 546                           (dom->high_id - dom->low_id + 1), config->rangesize,
 547                           config->maxranges));
 548         }
 549
 550         DEBUG(10, ("Current configuration in config is "
 551                    "minvalue:%d rangesize:%d maxranges:%d\n",
 552                    config->minvalue, config->rangesize, config->maxranges));
 553
 554         /* read previously stored config and current HWM */
 555         storedconfig = idmap_autorid_loadconfig(talloc_tos());
 556
 557         status = dbwrap_fetch_uint32(autorid_db, HWM, &hwm);
 558         if (!NT_STATUS_IS_OK(status)) {
 559                 DEBUG(1, ("Fatal error while fetching current "
 560                           "HWM value: %s\n", nt_errstr(status)));
 561                 status = NT_STATUS_INTERNAL_ERROR;
 562                 goto error;
 563         }
 564
 565         /* did the minimum value or rangesize change? */
 566         if (storedconfig &&
 567             ((storedconfig->minvalue != config->minvalue) ||
 568              (storedconfig->rangesize != config->rangesize))) {
 569                 DEBUG(1, ("New configuration values for rangesize or "
 570                           "minimum uid value conflict with previously "
 571                           "used values! Aborting initialization\n"));
 572                 status = NT_STATUS_INVALID_PARAMETER;
 573                 goto error;
 574         }
 575
 576         /*
 577          * has the highest uid value been reduced to setting that is not
 578          * sufficient any more for already existing ranges?
 579          */
 580         if (hwm > config->maxranges) {
 581                 DEBUG(1, ("New upper uid limit is too low to cover "
 582                           "existing mappings! Aborting initialization\n"));
 583                 status = NT_STATUS_INVALID_PARAMETER;
 584                 goto error;
 585         }
 586
 587         status = idmap_autorid_saveconfig(config);
 588
 589         if (!NT_STATUS_IS_OK(status)) {
 590                 DEBUG(1, ("Failed to store configuration data!\n"));
 591                 goto error;
 592         }
 593
 594         DEBUG(5, ("%d domain ranges with a size of %d are available\n",
 595                   config->maxranges, config->rangesize));
 596
 597         dom->private_data = config;
 598
 599         goto done;
 600
 601 error:
 602         talloc_free(config);
 603
 604 done:
 605         talloc_free(storedconfig);
 606
 607         return status;
 608 }
 609
 610 static NTSTATUS idmap_autorid_allocate_id(struct idmap_domain *dom,
 611                                           struct unixid *xid) {
 612
 613         NTSTATUS ret;
 614         struct autorid_global_config *globalcfg;
 615         struct autorid_domain_config domaincfg;
 616         uint32_t hwm;
 617         const char *hwmkey;
 618
 619         if (!strequal(dom->name, "*")) {
 620                 DEBUG(3, ("idmap_autorid_allocate_id: "
 621                           "Refusing creation of mapping for domain'%s'. "
 622                           "Currently only supported for the default "
 623                           "domain \"*\".\n",
 624                            dom->name));
 625                 return NT_STATUS_NOT_IMPLEMENTED;
 626         }
 627
 628         if ((xid->type != ID_TYPE_UID) && (xid->type != ID_TYPE_GID)) {
 629                 return NT_STATUS_INVALID_PARAMETER;
 630         }
 631
 632
 633         globalcfg = talloc_get_type(dom->private_data,
 634                                     struct autorid_global_config);
 635
 636         /* fetch the range for the allocation pool */
 637
 638         ZERO_STRUCT(domaincfg);
 639
 640         domaincfg.globalcfg = globalcfg;
 641         fstrcpy(domaincfg.sid, ALLOC_RANGE);
 642
 643         ret = idmap_autorid_get_domainrange(&domaincfg);
 644
 645         if (!NT_STATUS_IS_OK(ret)) {
 646                 DEBUG(3, ("Could not determine range for allocation pool, "
 647                           "check previous messages for reason\n"));
 648                 return ret;
 649         }
 650
 651         /* fetch the current HWM */
 652         hwmkey = (xid->type==ID_TYPE_UID)?ALLOC_HWM_UID:ALLOC_HWM_GID;
 653
 654         ret = dbwrap_fetch_uint32(autorid_db, hwmkey, &hwm);
 655
 656         if (!NT_STATUS_IS_OK(ret)) {
 657                 DEBUG(1, ("Failed to fetch current allocation HWM value: %s\n",
 658                           nt_errstr(ret)));
 659                 return NT_STATUS_INTERNAL_ERROR;
 660         }
 661
 662         if (hwm >= globalcfg->rangesize) {
 663                 DEBUG(1, ("allocation range is depleted!\n"));
 664                 return NT_STATUS_NO_MEMORY;
 665         }
 666
 667         ret = dbwrap_change_uint32_atomic(autorid_db, hwmkey, &(xid->id), 1);
 668         if (!NT_STATUS_IS_OK(ret)) {
 669                 DEBUG(1, ("Fatal error while allocating new ID!\n"));
 670                 return ret;
 671         }
 672
 673         xid->id = globalcfg->minvalue +
 674                   globalcfg->rangesize * domaincfg.domainnum +
 675                   xid->id;
 676
 677         DEBUG(10, ("Returned new %s %d from allocation range\n",
 678                    (xid->type==ID_TYPE_UID)?"uid":"gid", xid->id));
 679
 680         return ret;
 681 }
 682
 683 /*
 684   Close the idmap tdb instance
 685 */
 686 static struct idmap_methods autorid_methods = {
 687         .init = idmap_autorid_initialize,
 688         .unixids_to_sids = idmap_autorid_unixids_to_sids,
 689         .sids_to_unixids = idmap_autorid_sids_to_unixids,
 690         .allocate_id     = idmap_autorid_allocate_id
 691 };
 692
 693 NTSTATUS samba_init_module(void)
 694 {
 695         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION,
 696                                   "autorid", &autorid_methods);
 697 }