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, 2010-2012
   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 /*
  26  * This module allocates ranges for domains to be used in a
  27  * algorithmic mode like idmap_rid. Multiple ranges are supported
  28  * for a single domain: If a rid exceeds the range size, a matching
  29  * range is allocated to hold the rid's id.
  30  *
  31  * Here are the formulas applied:
  32  *
  33  *
  34  * For a sid of the form domain_sid-rid, we have
  35  *
  36  *   rid = reduced_rid + domain_range_index * range_size
  37  *
  38  * with
  39  *   reduced_rid := rid % range_size
  40  *   domain_range_index := rid / range_size
  41  *
  42  * And reduced_rid fits into a range.
  43  *
  44  * In the database, we associate a range_number to
  45  * the pair domain_sid,domain_range_index.
  46  *
  47  * Now the unix id for the given sid calculates as:
  48  *
  49  *   id = reduced_rid + range_low_id
  50  *
  51  * with
  52  *
  53  *   range_low_id = low_id + range_number * range_size
  54  *
  55  *
  56  * The inverse calculation goes like this:
  57  *
  58  * Given a unix id, let
  59  *
  60  *   normalized_id := id - low_id
  61  *   reduced_rid := normalized_id % range_size
  62  *   range_number = normalized_id / range_size
  63  *
  64  * Then we have
  65  *
  66  *   id = reduced_rid + low_id + range_number * range_size
  67  *
  68  * From the database, get the domain_sid,domain_range_index pair
  69  * belonging to the range_number (if there is already one).
  70  *
  71  * Then the rid for the unix id calculates as:
  72  *
  73  *   rid = reduced_rid + domain_range_index * range_size
  74  */
  75
  76 #include "idmap_autorid_tdb.h"
  77 #include "winbindd.h"
  78 #include "idmap.h"
  79 #include "idmap_rw.h"
  80 #include "../libcli/security/dom_sid.h"
  81
  82 #undef DBGC_CLASS
  83 #define DBGC_CLASS DBGC_IDMAP
  84
  85 #define IDMAP_AUTORID_ALLOC_RESERVED 500
  86
  87 /* handle to the tdb storing domain <-> range assignments */
  88 static struct db_context *autorid_db;
  89
  90 static bool ignore_builtin = false;
  91
  92 static NTSTATUS idmap_autorid_get_alloc_range(struct idmap_domain *dom,
  93                                         struct autorid_range_config *range)
  94 {
  95         NTSTATUS status;
  96
  97         ZERO_STRUCT(*range);
  98
  99         fstrcpy(range->domsid, ALLOC_RANGE);
 100
 101         status = idmap_autorid_get_domainrange(autorid_db,
 102                                                range,
 103                                                dom->read_only);
 104
 105         return status;
 106 }
 107
 108 static NTSTATUS idmap_autorid_allocate_id(struct idmap_domain *dom,
 109                                           struct unixid *xid) {
 110
 111         NTSTATUS ret;
 112         struct autorid_range_config range;
 113
 114         if (dom->read_only) {
 115                 DEBUG(3, ("Backend is read-only, refusing "
 116                           "new allocation request\n"));
 117                 return NT_STATUS_UNSUCCESSFUL;
 118         }
 119
 120         /* fetch the range for the allocation pool */
 121
 122         ret = idmap_autorid_get_alloc_range(dom, &range);
 123         if (!NT_STATUS_IS_OK(ret)) {
 124                 DEBUG(3, ("Could not determine range for allocation pool, "
 125                           "check previous messages for reason\n"));
 126                 return ret;
 127         }
 128
 129         ret = idmap_tdb_common_get_new_id(dom, xid);
 130
 131         if (!NT_STATUS_IS_OK(ret)) {
 132                 DEBUG(1, ("Fatal error while allocating new ID!\n"));
 133                 return ret;
 134         }
 135
 136         xid->id = xid->id + range.low_id;
 137
 138         DEBUG(10, ("Returned new %s %d from allocation range\n",
 139                    (xid->type==ID_TYPE_UID)?"uid":"gid", xid->id));
 140
 141         return ret;
 142 }
 143
 144 /*
 145  * map a SID to xid using the idmap_tdb like pool
 146  */
 147 static NTSTATUS idmap_autorid_id_to_sid_alloc(struct idmap_domain *dom,
 148                                               struct id_map *map)
 149 {
 150         NTSTATUS ret;
 151
 152         /* look out for the mapping */
 153         ret = idmap_tdb_common_unixid_to_sid(dom, map);
 154
 155         if (NT_STATUS_IS_OK(ret)) {
 156                 map->status = ID_MAPPED;
 157                 return ret;
 158         }
 159
 160         map->status = ID_UNKNOWN;
 161
 162         DEBUG(10, ("no ID->SID mapping for %d could be found\n", map->xid.id));
 163
 164         return ret;
 165 }
 166
 167 static NTSTATUS idmap_autorid_id_to_sid(struct autorid_global_config *cfg,
 168                                         struct idmap_domain *dom,
 169                                         struct id_map *map)
 170 {
 171         uint32_t range_number;
 172         uint32_t domain_range_index = 0;
 173         uint32_t normalized_id;
 174         uint32_t reduced_rid;
 175         uint32_t rid;
 176         TDB_DATA data = tdb_null;
 177         char *keystr;
 178         struct dom_sid domsid;
 179         NTSTATUS status;
 180         bool ok;
 181         const char *q = NULL;
 182
 183         /* can this be one of our ids? */
 184         if (map->xid.id < cfg->minvalue) {
 185                 DEBUG(10, ("id %d is lower than minimum value, "
 186                            "ignoring mapping request\n", map->xid.id));
 187                 map->status = ID_UNKNOWN;
 188                 return NT_STATUS_OK;
 189         }
 190
 191         if (map->xid.id > (cfg->minvalue + cfg->rangesize * cfg->maxranges)) {
 192                 DEBUG(10, ("id %d is outside of maximum id value, "
 193                            "ignoring mapping request\n", map->xid.id));
 194                 map->status = ID_UNKNOWN;
 195                 return NT_STATUS_OK;
 196         }
 197
 198         /* determine the range of this uid */
 199
 200         normalized_id = map->xid.id - cfg->minvalue;
 201         range_number = normalized_id / cfg->rangesize;
 202
 203         keystr = talloc_asprintf(talloc_tos(), "%u", range_number);
 204         if (!keystr) {
 205                 return NT_STATUS_NO_MEMORY;
 206         }
 207
 208         status = dbwrap_fetch_bystring(autorid_db, talloc_tos(), keystr, &data);
 209         TALLOC_FREE(keystr);
 210
 211         if (!NT_STATUS_IS_OK(status)) {
 212                 DEBUG(4, ("id %d belongs to range %d which does not have "
 213                           "domain mapping, ignoring mapping request\n",
 214                           map->xid.id, range_number));
 215                 TALLOC_FREE(data.dptr);
 216                 map->status = ID_UNKNOWN;
 217                 return NT_STATUS_OK;
 218         }
 219
 220         if (strncmp((const char *)data.dptr,
 221                     ALLOC_RANGE,
 222                     strlen(ALLOC_RANGE)) == 0) {
 223                 /*
 224                  * this is from the alloc range, check if there is a mapping
 225                  */
 226                 DEBUG(5, ("id %d belongs to allocation range, "
 227                           "checking for mapping\n",
 228                           map->xid.id));
 229                 TALLOC_FREE(data.dptr);
 230                 return idmap_autorid_id_to_sid_alloc(dom, map);
 231         }
 232
 233         ok = dom_sid_parse_endp((const char *)data.dptr, &domsid, &q);
 234         TALLOC_FREE(data.dptr);
 235         if (!ok) {
 236                 map->status = ID_UNKNOWN;
 237                 return NT_STATUS_OK;
 238         }
 239         if ((q != NULL) && (*q != '\0'))
 240                 if (sscanf(q+1, "%"SCNu32, &domain_range_index) != 1) {
 241                         DEBUG(10, ("Domain range index not found, "
 242                                    "ignoring mapping request\n"));
 243                         map->status = ID_UNKNOWN;
 244                         return NT_STATUS_OK;
 245                 }
 246
 247         reduced_rid = normalized_id % cfg->rangesize;
 248         rid = reduced_rid + domain_range_index * cfg->rangesize;
 249
 250         sid_compose(map->sid, &domsid, rid);
 251
 252         /* We **really** should have some way of validating
 253            the SID exists and is the correct type here.  But
 254            that is a deficiency in the idmap_rid design. */
 255
 256         map->status = ID_MAPPED;
 257         map->xid.type = ID_TYPE_BOTH;
 258
 259         return NT_STATUS_OK;
 260 }
 261
 262 /**********************************
 263  Single sid to id lookup function.
 264 **********************************/
 265
 266 static NTSTATUS idmap_autorid_sid_to_id_rid(
 267                                         struct autorid_global_config *global,
 268                                         struct autorid_range_config *range,
 269                                         struct id_map *map)
 270 {
 271         uint32_t rid;
 272         uint32_t reduced_rid;
 273
 274         sid_peek_rid(map->sid, &rid);
 275
 276         reduced_rid = rid % global->rangesize;
 277
 278         map->xid.id = reduced_rid + range->low_id;
 279         map->xid.type = ID_TYPE_BOTH;
 280         map->status = ID_MAPPED;
 281
 282         return NT_STATUS_OK;
 283 }
 284
 285 /**********************************
 286  lookup a set of unix ids.
 287 **********************************/
 288
 289 static NTSTATUS idmap_autorid_unixids_to_sids(struct idmap_domain *dom,
 290                                               struct id_map **ids)
 291 {
 292         struct idmap_tdb_common_context *commoncfg;
 293         struct autorid_global_config *globalcfg;
 294         NTSTATUS ret;
 295         int i;
 296         int num_tomap = 0;
 297         int num_mapped = 0;
 298
 299         /* initialize the status to avoid surprise */
 300         for (i = 0; ids[i]; i++) {
 301                 ids[i]->status = ID_UNKNOWN;
 302                 num_tomap++;
 303         }
 304
 305         commoncfg =
 306             talloc_get_type_abort(dom->private_data,
 307                                   struct idmap_tdb_common_context);
 308
 309         globalcfg = talloc_get_type(commoncfg->private_data,
 310                                     struct autorid_global_config);
 311
 312         for (i = 0; ids[i]; i++) {
 313
 314                 ret = idmap_autorid_id_to_sid(globalcfg, dom, ids[i]);
 315
 316                 if ((!NT_STATUS_IS_OK(ret)) &&
 317                     (!NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
 318                         /* some fatal error occurred, log it */
 319                         DEBUG(3, ("Unexpected error resolving an ID "
 320                                   " (%d)\n", ids[i]->xid.id));
 321                         goto failure;
 322                 }
 323
 324                 if (NT_STATUS_IS_OK(ret) && ids[i]->status == ID_MAPPED) {
 325                         num_mapped++;
 326                 }
 327
 328         }
 329
 330         if (num_tomap == num_mapped) {
 331                 return NT_STATUS_OK;
 332         } else if (num_mapped == 0) {
 333                 return NT_STATUS_NONE_MAPPED;
 334         }
 335
 336         return STATUS_SOME_UNMAPPED;
 337
 338
 339       failure:
 340         return ret;
 341 }
 342
 343 static bool idmap_autorid_sid_is_special(struct dom_sid *sid)
 344 {
 345         bool match;
 346
 347         match = sid_check_is_in_wellknown_domain(sid);
 348         if (match) {
 349                 return true;
 350         }
 351
 352         return false;
 353 }
 354
 355 static NTSTATUS idmap_autorid_sid_to_id_special(struct idmap_domain *dom,
 356                                                 struct id_map *map)
 357 {
 358         struct idmap_tdb_common_context *common =
 359                 talloc_get_type_abort(dom->private_data,
 360                                       struct idmap_tdb_common_context);
 361         uint32_t count;
 362         struct autorid_range_config range;
 363         NTSTATUS status;
 364         uint32_t free_id;
 365
 366         status = idmap_autorid_get_alloc_range(dom, &range);
 367         if (!NT_STATUS_IS_OK(status)) {
 368                 return status;
 369         }
 370
 371         /* Take the next free ID, counting from the top */
 372         free_id = 0;
 373         for (count = 0; count < IDMAP_AUTORID_ALLOC_RESERVED; count++) {
 374                 struct id_map test_map;
 375                 struct dom_sid sid;
 376
 377                 test_map.sid = &sid;
 378                 test_map.xid.type = map->xid.type;
 379                 test_map.xid.id = range.high_id - count;
 380                 test_map.status = ID_UNKNOWN;
 381
 382                 status = idmap_tdb_common_unixid_to_sid(dom, &test_map);
 383                 if (NT_STATUS_EQUAL(NT_STATUS_NONE_MAPPED, status)) {
 384                         free_id = test_map.xid.id;
 385                         break;
 386                 }
 387
 388                 if (!NT_STATUS_IS_OK(status)) {
 389                         /* error - get out */
 390                         return status;
 391                 }
 392
 393                 /* mapping exists - try next ID */
 394         }
 395
 396         if (free_id == 0) {
 397                 return NT_STATUS_NONE_MAPPED;
 398         }
 399
 400         map->status = ID_MAPPED;
 401         map->xid.id = free_id;
 402
 403         status = common->rw_ops->set_mapping(dom, map);
 404         if (!NT_STATUS_IS_OK(status)) {
 405                 DEBUG(2, ("Error storing new mapping: %s\n",
 406                           nt_errstr(status)));
 407                 return status;
 408         }
 409
 410         return NT_STATUS_OK;
 411 }
 412
 413 struct idmap_autorid_sid_to_id_alloc_ctx {
 414         struct idmap_domain *dom;
 415         struct id_map *map;
 416 };
 417
 418 static NTSTATUS idmap_autorid_sid_to_id_alloc_action(
 419                                 struct db_context *db,
 420                                 void *private_data)
 421 {
 422         struct idmap_autorid_sid_to_id_alloc_ctx *ctx;
 423
 424         ctx = (struct idmap_autorid_sid_to_id_alloc_ctx *)private_data;
 425
 426         if (idmap_autorid_sid_is_special(ctx->map->sid)) {
 427                 NTSTATUS ret;
 428
 429                 ret = idmap_autorid_sid_to_id_special(ctx->dom, ctx->map);
 430                 if (NT_STATUS_IS_OK(ret)) {
 431                         return NT_STATUS_OK;
 432                 }
 433                 if (!NT_STATUS_EQUAL(NT_STATUS_NONE_MAPPED, ret)) {
 434                         return ret;
 435                 }
 436
 437                 DEBUG(10, ("Sepecial sid %s not mapped. falling back to "
 438                            "regular allocation\n",
 439                            sid_string_dbg(ctx->map->sid)));
 440         }
 441
 442         return idmap_tdb_common_new_mapping(ctx->dom, ctx->map);
 443 }
 444
 445 /*
 446  * map a SID to xid using the idmap_tdb like pool
 447  */
 448 static NTSTATUS idmap_autorid_sid_to_id_alloc(
 449                                         struct idmap_tdb_common_context *ctx,
 450                                         struct idmap_domain *dom,
 451                                         struct id_map *map)
 452 {
 453         NTSTATUS ret;
 454         struct idmap_autorid_sid_to_id_alloc_ctx alloc_ctx;
 455
 456         map->status = ID_UNKNOWN;
 457
 458         /* see if we already have a mapping */
 459         ret = idmap_tdb_common_sid_to_unixid(dom, map);
 460
 461         if (NT_STATUS_IS_OK(ret)) {
 462                 map->status = ID_MAPPED;
 463                 return ret;
 464         }
 465
 466         /* bad things happened */
 467         if (!NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED)) {
 468                 DEBUG(1, ("Looking up SID->ID mapping for %s failed: %s\n",
 469                           sid_string_dbg(map->sid), nt_errstr(ret)));
 470                 return ret;
 471         }
 472
 473         if (dom->read_only) {
 474                 DEBUG(3, ("Not allocating new mapping for %s, because backend "
 475                           "is read-only\n", sid_string_dbg(map->sid)));
 476                 map->status = ID_UNMAPPED;
 477                 return NT_STATUS_NONE_MAPPED;
 478         }
 479
 480         DEBUG(10, ("Creating new mapping in pool for %s\n",
 481                    sid_string_dbg(map->sid)));
 482
 483         alloc_ctx.dom = dom;
 484         alloc_ctx.map = map;
 485
 486         ret = dbwrap_trans_do(ctx->db, idmap_autorid_sid_to_id_alloc_action,
 487                               &alloc_ctx);
 488         if (!NT_STATUS_IS_OK(ret)) {
 489                 DEBUG(1, ("Failed to create a new mapping in alloc range: %s\n",
 490                           nt_errstr(ret)));
 491                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 492         }
 493
 494         map->status = ID_MAPPED;
 495         return NT_STATUS_OK;
 496 }
 497
 498 static bool idmap_autorid_domsid_is_for_alloc(struct dom_sid *sid)
 499 {
 500         bool match;
 501
 502         match = sid_check_is_wellknown_domain(sid, NULL);
 503         if (match) {
 504                 return true;
 505         }
 506
 507         return false;
 508 }
 509
 510 static NTSTATUS idmap_autorid_sid_to_id(struct idmap_tdb_common_context *common,
 511                                         struct idmap_domain *dom,
 512                                         struct id_map *map)
 513 {
 514         struct autorid_global_config *global =
 515                 talloc_get_type_abort(common->private_data,
 516                                       struct autorid_global_config);
 517         struct winbindd_tdc_domain *domain;
 518         struct autorid_range_config range;
 519         uint32_t rid;
 520         struct dom_sid domainsid;
 521         NTSTATUS ret;
 522
 523         ZERO_STRUCT(range);
 524         map->status = ID_UNKNOWN;
 525
 526         DEBUG(10, ("Trying to map %s\n", sid_string_dbg(map->sid)));
 527
 528         sid_copy(&domainsid, map->sid);
 529         if (!sid_split_rid(&domainsid, &rid)) {
 530                 DEBUG(4, ("Could not determine domain SID from %s, "
 531                           "ignoring mapping request\n",
 532                           sid_string_dbg(map->sid)));
 533                 map->status = ID_UNMAPPED;
 534                 return NT_STATUS_NONE_MAPPED;
 535         }
 536
 537         if (idmap_autorid_domsid_is_for_alloc(&domainsid)) {
 538                 DEBUG(10, ("SID %s is for ALLOC range.\n",
 539                            sid_string_dbg(map->sid)));
 540
 541                 return idmap_autorid_sid_to_id_alloc(common, dom, map);
 542         }
 543
 544         if (dom_sid_equal(&domainsid, &global_sid_Builtin) && ignore_builtin) {
 545                 DEBUG(10, ("Ignoring request for BUILTIN domain\n"));
 546                 map->status = ID_UNMAPPED;
 547                 return NT_STATUS_NONE_MAPPED;
 548         }
 549
 550         /*
 551          * Check if the domain is around
 552          */
 553         domain = wcache_tdc_fetch_domainbysid(talloc_tos(),
 554                                               &domainsid);
 555         if (domain == NULL) {
 556                 DEBUG(10, ("Ignoring unknown domain sid %s\n",
 557                            sid_string_dbg(&domainsid)));
 558                 map->status = ID_UNMAPPED;
 559                 return NT_STATUS_NONE_MAPPED;
 560         }
 561         TALLOC_FREE(domain);
 562
 563         sid_to_fstring(range.domsid, &domainsid);
 564
 565         range.domain_range_index = rid / (global->rangesize);
 566
 567         ret = idmap_autorid_get_domainrange(autorid_db, &range, dom->read_only);
 568         if (NT_STATUS_EQUAL(ret, NT_STATUS_NOT_FOUND) && dom->read_only) {
 569                 DEBUG(10, ("read-only is enabled, did not allocate "
 570                            "new range for domain %s\n",
 571                            sid_string_dbg(&domainsid)));
 572                 map->status = ID_UNMAPPED;
 573                 return NT_STATUS_NONE_MAPPED;
 574         }
 575         if (!NT_STATUS_IS_OK(ret)) {
 576                 DEBUG(3, ("Could not determine range for domain, "
 577                           "check previous messages for reason\n"));
 578                 return ret;
 579         }
 580
 581         return idmap_autorid_sid_to_id_rid(global, &range, map);
 582 }
 583
 584 /**********************************
 585  lookup a set of sids.
 586 **********************************/
 587
 588 static NTSTATUS idmap_autorid_sids_to_unixids(struct idmap_domain *dom,
 589                                               struct id_map **ids)
 590 {
 591         struct idmap_tdb_common_context *commoncfg;
 592         NTSTATUS ret;
 593         int i;
 594         int num_tomap = 0;
 595         int num_mapped = 0;
 596
 597         /* initialize the status to avoid surprise */
 598         for (i = 0; ids[i]; i++) {
 599                 ids[i]->status = ID_UNKNOWN;
 600                 num_tomap++;
 601         }
 602
 603         commoncfg =
 604             talloc_get_type_abort(dom->private_data,
 605                                   struct idmap_tdb_common_context);
 606
 607         for (i = 0; ids[i]; i++) {
 608                 ret = idmap_autorid_sid_to_id(commoncfg, dom, ids[i]);
 609                 if ((!NT_STATUS_IS_OK(ret)) &&
 610                     (!NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
 611                         /* some fatal error occurred, log it */
 612                         DEBUG(3, ("Unexpected error resolving a SID (%s)\n",
 613                                   sid_string_dbg(ids[i]->sid)));
 614                         return ret;
 615                 }
 616
 617                 if (NT_STATUS_IS_OK(ret) && ids[i]->status == ID_MAPPED) {
 618                         num_mapped++;
 619                 }
 620         }
 621
 622         if (num_tomap == num_mapped) {
 623                 return NT_STATUS_OK;
 624         } else if (num_mapped == 0) {
 625                 return NT_STATUS_NONE_MAPPED;
 626         }
 627
 628         return STATUS_SOME_UNMAPPED;
 629 }
 630
 631 static NTSTATUS idmap_autorid_preallocate_wellknown(struct idmap_domain *dom)
 632 {
 633         const char *groups[] = { "S-1-1-0", "S-1-2-0", "S-1-2-1",
 634                 "S-1-3-0", "S-1-3-1", "S-1-3-2", "S-1-3-3", "S-1-3-4",
 635                 "S-1-5-1", "S-1-5-2", "S-1-5-3", "S-1-5-4", "S-1-5-6",
 636                 "S-1-5-7", "S-1-5-8", "S-1-5-9", "S-1-5-10", "S-1-5-11",
 637                 "S-1-5-12", "S-1-5-13", "S-1-5-14", "S-1-5-15",
 638                 "S-1-5-17", "S-1-5-18", "S-1-5-19", "S-1-5-20"
 639         };
 640
 641         struct id_map **maps;
 642         int i, num;
 643         NTSTATUS status;
 644
 645         if (dom->read_only) {
 646                 return NT_STATUS_OK;
 647         }
 648
 649         num = ARRAY_SIZE(groups);
 650
 651         maps = talloc_array(talloc_tos(), struct id_map*, num+1);
 652         if (!maps) {
 653                 return NT_STATUS_NO_MEMORY;
 654         }
 655
 656         for (i = 0; i < num; i++) {
 657                 maps[i] = talloc(maps, struct id_map);
 658                 if (maps[i] == NULL) {
 659                         talloc_free(maps);
 660                         return NT_STATUS_NO_MEMORY;
 661                 }
 662                 maps[i]->xid.type = ID_TYPE_GID;
 663                 maps[i]->sid = dom_sid_parse_talloc(maps, groups[i]);
 664         }
 665
 666         maps[num] = NULL;
 667
 668         status = idmap_autorid_sids_to_unixids(dom, maps);
 669
 670         DEBUG(10,("Preallocation run finished with status %s\n",
 671                   nt_errstr(status)));
 672
 673         talloc_free(maps);
 674
 675         return NT_STATUS_IS_OK(status)?NT_STATUS_OK:NT_STATUS_UNSUCCESSFUL;
 676 }
 677
 678 static NTSTATUS idmap_autorid_initialize_action(struct db_context *db,
 679                                                 void *private_data)
 680 {
 681         struct idmap_domain *dom;
 682         struct idmap_tdb_common_context *common;
 683         struct autorid_global_config *config;
 684         NTSTATUS status;
 685
 686         dom = (struct idmap_domain *)private_data;
 687         common = (struct idmap_tdb_common_context *)dom->private_data;
 688         config = (struct autorid_global_config *)common->private_data;
 689
 690         status = idmap_autorid_init_hwms(db);
 691         if (!NT_STATUS_IS_OK(status)) {
 692                 return status;
 693         }
 694
 695         status = idmap_autorid_saveconfig(db, config);
 696         if (!NT_STATUS_IS_OK(status)) {
 697                 DEBUG(1, ("Failed to store configuration data!\n"));
 698                 return status;
 699         }
 700
 701         status = idmap_autorid_preallocate_wellknown(dom);
 702         if (!NT_STATUS_IS_OK(status)) {
 703                 DEBUG(1, ("Failed to preallocate wellknown sids: %s\n",
 704                           nt_errstr(status)));
 705                 return status;
 706         }
 707
 708         return NT_STATUS_OK;
 709 }
 710
 711 static NTSTATUS idmap_autorid_initialize(struct idmap_domain *dom)
 712 {
 713         struct idmap_tdb_common_context *commonconfig;
 714         struct autorid_global_config *config;
 715         NTSTATUS status;
 716         char *db_path;
 717
 718         if (!strequal(dom->name, "*")) {
 719                 DEBUG(0, ("idmap_autorid_initialize: Error: autorid configured "
 720                           "for domain '%s'. But autorid can only be used for "
 721                           "the default idmap configuration.\n", dom->name));
 722                 return NT_STATUS_INVALID_PARAMETER;
 723         }
 724
 725         commonconfig = talloc_zero(dom, struct idmap_tdb_common_context);
 726         if (!commonconfig) {
 727                 DEBUG(0, ("Out of memory!\n"));
 728                 return NT_STATUS_NO_MEMORY;
 729         }
 730         dom->private_data = commonconfig;
 731
 732         commonconfig->rw_ops = talloc_zero(commonconfig, struct idmap_rw_ops);
 733         if (commonconfig->rw_ops == NULL) {
 734                 DEBUG(0, ("Out of memory!\n"));
 735                 return NT_STATUS_NO_MEMORY;
 736         }
 737
 738         config = talloc_zero(commonconfig, struct autorid_global_config);
 739         if (!config) {
 740                 DEBUG(0, ("Out of memory!\n"));
 741                 return NT_STATUS_NO_MEMORY;
 742         }
 743         commonconfig->private_data = config;
 744
 745         config->minvalue = dom->low_id;
 746         config->rangesize = lp_parm_int(-1, "idmap config *",
 747                                         "rangesize", 100000);
 748
 749         config->maxranges = (dom->high_id - dom->low_id + 1) /
 750             config->rangesize;
 751
 752         if (config->maxranges == 0) {
 753                 DEBUG(1, ("Allowed uid range is smaller than rangesize. "
 754                           "Increase uid range or decrease rangesize.\n"));
 755                 status = NT_STATUS_INVALID_PARAMETER;
 756                 goto error;
 757         }
 758
 759         /* check if the high-low limit is a multiple of the rangesize */
 760         if ((dom->high_id - dom->low_id + 1) % config->rangesize != 0) {
 761                 DEBUG(5, ("High uid-low uid difference of %d "
 762                           "is not a multiple of the rangesize %d, "
 763                           "limiting ranges to lower boundary number of %d\n",
 764                           (dom->high_id - dom->low_id + 1), config->rangesize,
 765                           config->maxranges));
 766         }
 767
 768         DEBUG(5, ("%d domain ranges with a size of %d are available\n",
 769                   config->maxranges, config->rangesize));
 770
 771         ignore_builtin = lp_parm_bool(-1, "idmap config *",
 772                                       "ignore builtin", false);
 773
 774         /* fill the TDB common configuration */
 775
 776         commonconfig->max_id = config->rangesize - 1
 777                              - IDMAP_AUTORID_ALLOC_RESERVED;
 778         commonconfig->hwmkey_uid = ALLOC_HWM_UID;
 779         commonconfig->hwmkey_gid = ALLOC_HWM_GID;
 780         commonconfig->rw_ops->get_new_id = idmap_autorid_allocate_id;
 781         commonconfig->rw_ops->set_mapping = idmap_tdb_common_set_mapping;
 782
 783         db_path = state_path("autorid.tdb");
 784         if (db_path == NULL) {
 785                 status = NT_STATUS_NO_MEMORY;
 786                 goto error;
 787         }
 788
 789         status = idmap_autorid_db_open(db_path,
 790                                        NULL, /* TALLOC_CTX */
 791                                        &autorid_db);
 792         TALLOC_FREE(db_path);
 793         if (!NT_STATUS_IS_OK(status)) {
 794                 goto error;
 795         }
 796
 797         commonconfig->db = autorid_db;
 798
 799         status = dbwrap_trans_do(autorid_db,
 800                                  idmap_autorid_initialize_action,
 801                                  dom);
 802         if (!NT_STATUS_IS_OK(status)) {
 803                 DEBUG(1, ("Failed to init the idmap database: %s\n",
 804                           nt_errstr(status)));
 805                 goto error;
 806         }
 807
 808         goto done;
 809
 810 error:
 811         talloc_free(config);
 812
 813 done:
 814         return status;
 815 }
 816
 817 /*
 818   Close the idmap tdb instance
 819 */
 820 static struct idmap_methods autorid_methods = {
 821         .init = idmap_autorid_initialize,
 822         .unixids_to_sids = idmap_autorid_unixids_to_sids,
 823         .sids_to_unixids = idmap_autorid_sids_to_unixids,
 824         .allocate_id     = idmap_autorid_allocate_id
 825 };
 826
 827 NTSTATUS idmap_autorid_init(void)
 828 {
 829         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION,
 830                                   "autorid", &autorid_methods);
 831 }