source3/winbindd/idmap_tdb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    idmap TDB backend
   5
   6    Copyright (C) Tim Potter 2000
   7    Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
   8    Copyright (C) Jeremy Allison 2006
   9    Copyright (C) Simo Sorce 2003-2006
  10    Copyright (C) Michael Adam 2009-2010
  11
  12    This program is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 3 of the License, or
  15    (at your option) any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  24 */
  25
  26 #include "includes.h"
  27 #include "system/filesys.h"
  28 #include "winbindd.h"
  29 #include "idmap.h"
  30 #include "idmap_rw.h"
  31 #include "dbwrap/dbwrap.h"
  32 #include "dbwrap/dbwrap_open.h"
  33 #include "../libcli/security/security.h"
  34 #include "util_tdb.h"
  35
  36 #undef DBGC_CLASS
  37 #define DBGC_CLASS DBGC_IDMAP
  38
  39 /* idmap version determines auto-conversion - this is the database
  40    structure version specifier. */
  41
  42 #define IDMAP_VERSION 2
  43
  44 struct idmap_tdb_context {
  45         struct db_context *db;
  46         struct idmap_rw_ops *rw_ops;
  47 };
  48
  49 /* High water mark keys */
  50 #define HWM_GROUP  "GROUP HWM"
  51 #define HWM_USER   "USER HWM"
  52
  53 struct convert_fn_state {
  54         struct db_context *db;
  55         bool failed;
  56 };
  57
  58 /*****************************************************************************
  59  For idmap conversion: convert one record to new format
  60  Ancient versions (eg 2.2.3a) of winbindd_idmap.tdb mapped DOMAINNAME/rid
  61  instead of the SID.
  62 *****************************************************************************/
  63 static int convert_fn(struct db_record *rec, void *private_data)
  64 {
  65         struct winbindd_domain *domain;
  66         char *p;
  67         NTSTATUS status;
  68         struct dom_sid sid;
  69         uint32 rid;
  70         fstring keystr;
  71         fstring dom_name;
  72         TDB_DATA key2;
  73         struct convert_fn_state *s = (struct convert_fn_state *)private_data;
  74
  75         DEBUG(10,("Converting %s\n", (const char *)rec->key.dptr));
  76
  77         p = strchr((const char *)rec->key.dptr, '/');
  78         if (!p)
  79                 return 0;
  80
  81         *p = 0;
  82         fstrcpy(dom_name, (const char *)rec->key.dptr);
  83         *p++ = '/';
  84
  85         domain = find_domain_from_name(dom_name);
  86         if (domain == NULL) {
  87                 /* We must delete the old record. */
  88                 DEBUG(0,("Unable to find domain %s\n", dom_name ));
  89                 DEBUG(0,("deleting record %s\n", (const char *)rec->key.dptr ));
  90
  91                 status = rec->delete_rec(rec);
  92                 if (!NT_STATUS_IS_OK(status)) {
  93                         DEBUG(0, ("Unable to delete record %s:%s\n",
  94                                 (const char *)rec->key.dptr,
  95                                 nt_errstr(status)));
  96                         s->failed = true;
  97                         return -1;
  98                 }
  99
 100                 return 0;
 101         }
 102
 103         rid = atoi(p);
 104
 105         sid_compose(&sid, &domain->sid, rid);
 106
 107         sid_to_fstring(keystr, &sid);
 108         key2 = string_term_tdb_data(keystr);
 109
 110         status = dbwrap_store(s->db, key2, rec->value, TDB_INSERT);
 111         if (!NT_STATUS_IS_OK(status)) {
 112                 DEBUG(0,("Unable to add record %s:%s\n",
 113                         (const char *)key2.dptr,
 114                         nt_errstr(status)));
 115                 s->failed = true;
 116                 return -1;
 117         }
 118
 119         status = dbwrap_store(s->db, rec->value, key2, TDB_REPLACE);
 120         if (!NT_STATUS_IS_OK(status)) {
 121                 DEBUG(0,("Unable to update record %s:%s\n",
 122                         (const char *)rec->value.dptr,
 123                         nt_errstr(status)));
 124                 s->failed = true;
 125                 return -1;
 126         }
 127
 128         status = rec->delete_rec(rec);
 129         if (!NT_STATUS_IS_OK(status)) {
 130                 DEBUG(0,("Unable to delete record %s:%s\n",
 131                         (const char *)rec->key.dptr,
 132                         nt_errstr(status)));
 133                 s->failed = true;
 134                 return -1;
 135         }
 136
 137         return 0;
 138 }
 139
 140 /*****************************************************************************
 141  Convert the idmap database from an older version.
 142 *****************************************************************************/
 143
 144 static bool idmap_tdb_upgrade(struct idmap_domain *dom, struct db_context *db)
 145 {
 146         int32 vers;
 147         bool bigendianheader;
 148         struct convert_fn_state s;
 149
 150 #if BUILD_TDB2
 151         /* If we are bigendian, tdb is bigendian if NOT converted. */
 152         union {
 153                 uint16 large;
 154                 unsigned char small[2];
 155         } u;
 156         u.large = 0x0102;
 157         if (u.small[0] == 0x01)
 158                 bigendianheader = !(db->get_flags(db) & TDB_CONVERT);
 159         else {
 160                 assert(u.small[0] == 0x02);
 161                 bigendianheader = (db->get_flags(db) & TDB_CONVERT);
 162         }
 163 #else
 164         bigendianheader = (db->get_flags(db) & TDB_BIGENDIAN) ? True : False;
 165 #endif
 166         DEBUG(0, ("Upgrading winbindd_idmap.tdb from an old version\n"));
 167
 168         vers = dbwrap_fetch_int32(db, "IDMAP_VERSION");
 169
 170         if (((vers == -1) && bigendianheader) || (IREV(vers) == IDMAP_VERSION)) {
 171                 /* Arrggghh ! Bytereversed or old big-endian - make order independent ! */
 172                 /*
 173                  * high and low records were created on a
 174                  * big endian machine and will need byte-reversing.
 175                  */
 176
 177                 int32 wm;
 178
 179                 wm = dbwrap_fetch_int32(db, HWM_USER);
 180
 181                 if (wm != -1) {
 182                         wm = IREV(wm);
 183                 }  else {
 184                         wm = dom->low_id;
 185                 }
 186
 187                 if (dbwrap_store_int32(db, HWM_USER, wm) == -1) {
 188                         DEBUG(0, ("Unable to byteswap user hwm in idmap database\n"));
 189                         return False;
 190                 }
 191
 192                 wm = dbwrap_fetch_int32(db, HWM_GROUP);
 193                 if (wm != -1) {
 194                         wm = IREV(wm);
 195                 } else {
 196                         wm = dom->low_id;
 197                 }
 198
 199                 if (dbwrap_store_int32(db, HWM_GROUP, wm) == -1) {
 200                         DEBUG(0, ("Unable to byteswap group hwm in idmap database\n"));
 201                         return False;
 202                 }
 203         }
 204
 205         s.db = db;
 206         s.failed = false;
 207
 208         /* the old format stored as DOMAIN/rid - now we store the SID direct */
 209         db->traverse(db, convert_fn, &s);
 210
 211         if (s.failed) {
 212                 DEBUG(0, ("Problem during conversion\n"));
 213                 return False;
 214         }
 215
 216         if (dbwrap_store_int32(db, "IDMAP_VERSION", IDMAP_VERSION) == -1) {
 217                 DEBUG(0, ("Unable to store idmap version in database\n"));
 218                 return False;
 219         }
 220
 221         return True;
 222 }
 223
 224 static NTSTATUS idmap_tdb_init_hwm(struct idmap_domain *dom)
 225 {
 226         int ret;
 227         uint32_t low_uid;
 228         uint32_t low_gid;
 229         bool update_uid = false;
 230         bool update_gid = false;
 231         struct idmap_tdb_context *ctx;
 232
 233         ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
 234
 235         low_uid = dbwrap_fetch_int32(ctx->db, HWM_USER);
 236         if (low_uid == -1 || low_uid < dom->low_id) {
 237                 update_uid = true;
 238         }
 239
 240         low_gid = dbwrap_fetch_int32(ctx->db, HWM_GROUP);
 241         if (low_gid == -1 || low_gid < dom->low_id) {
 242                 update_gid = true;
 243         }
 244
 245         if (!update_uid && !update_gid) {
 246                 return NT_STATUS_OK;
 247         }
 248
 249         if (ctx->db->transaction_start(ctx->db) != 0) {
 250                 DEBUG(0, ("Unable to start upgrade transaction!\n"));
 251                 return NT_STATUS_INTERNAL_DB_ERROR;
 252         }
 253
 254         if (update_uid) {
 255                 ret = dbwrap_store_int32(ctx->db, HWM_USER, dom->low_id);
 256                 if (ret == -1) {
 257                         ctx->db->transaction_cancel(ctx->db);
 258                         DEBUG(0, ("Unable to initialise user hwm in idmap "
 259                                   "database\n"));
 260                         return NT_STATUS_INTERNAL_DB_ERROR;
 261                 }
 262         }
 263
 264         if (update_gid) {
 265                 ret = dbwrap_store_int32(ctx->db, HWM_GROUP, dom->low_id);
 266                 if (ret == -1) {
 267                         ctx->db->transaction_cancel(ctx->db);
 268                         DEBUG(0, ("Unable to initialise group hwm in idmap "
 269                                   "database\n"));
 270                         return NT_STATUS_INTERNAL_DB_ERROR;
 271                 }
 272         }
 273
 274         if (ctx->db->transaction_commit(ctx->db) != 0) {
 275                 DEBUG(0, ("Unable to commit upgrade transaction!\n"));
 276                 return NT_STATUS_INTERNAL_DB_ERROR;
 277         }
 278
 279         return NT_STATUS_OK;
 280 }
 281
 282 static NTSTATUS idmap_tdb_open_db(struct idmap_domain *dom)
 283 {
 284         NTSTATUS ret;
 285         TALLOC_CTX *mem_ctx;
 286         char *tdbfile = NULL;
 287         struct db_context *db = NULL;
 288         int32_t version;
 289         bool config_error = false;
 290         struct idmap_tdb_context *ctx;
 291
 292         ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
 293
 294         if (ctx->db) {
 295                 /* it is already open */
 296                 return NT_STATUS_OK;
 297         }
 298
 299         /* use our own context here */
 300         mem_ctx = talloc_stackframe();
 301
 302         /* use the old database if present */
 303         tdbfile = state_path("winbindd_idmap.tdb");
 304         if (!tdbfile) {
 305                 DEBUG(0, ("Out of memory!\n"));
 306                 ret = NT_STATUS_NO_MEMORY;
 307                 goto done;
 308         }
 309
 310         DEBUG(10,("Opening tdbfile %s\n", tdbfile ));
 311
 312         /* Open idmap repository */
 313         db = db_open(mem_ctx, tdbfile, 0, TDB_DEFAULT, O_RDWR | O_CREAT, 0644);
 314         if (!db) {
 315                 DEBUG(0, ("Unable to open idmap database\n"));
 316                 ret = NT_STATUS_UNSUCCESSFUL;
 317                 goto done;
 318         }
 319
 320         /* check against earlier versions */
 321         version = dbwrap_fetch_int32(db, "IDMAP_VERSION");
 322         if (version != IDMAP_VERSION) {
 323                 if (config_error) {
 324                         DEBUG(0,("Upgrade of IDMAP_VERSION from %d to %d is not "
 325                                  "possible with incomplete configuration\n",
 326                                  version, IDMAP_VERSION));
 327                         ret = NT_STATUS_UNSUCCESSFUL;
 328                         goto done;
 329                 }
 330                 if (db->transaction_start(db) != 0) {
 331                         DEBUG(0, ("Unable to start upgrade transaction!\n"));
 332                         ret = NT_STATUS_INTERNAL_DB_ERROR;
 333                         goto done;
 334                 }
 335
 336                 if (!idmap_tdb_upgrade(dom, db)) {
 337                         db->transaction_cancel(db);
 338                         DEBUG(0, ("Unable to open idmap database, it's in an old format, and upgrade failed!\n"));
 339                         ret = NT_STATUS_INTERNAL_DB_ERROR;
 340                         goto done;
 341                 }
 342
 343                 if (db->transaction_commit(db) != 0) {
 344                         DEBUG(0, ("Unable to commit upgrade transaction!\n"));
 345                         ret = NT_STATUS_INTERNAL_DB_ERROR;
 346                         goto done;
 347                 }
 348         }
 349
 350         ctx->db = talloc_move(ctx, &db);
 351
 352         ret = idmap_tdb_init_hwm(dom);
 353
 354 done:
 355         talloc_free(mem_ctx);
 356         return ret;
 357 }
 358
 359 /**********************************************************************
 360  IDMAP ALLOC TDB BACKEND
 361 **********************************************************************/
 362
 363 /**********************************
 364  Allocate a new id.
 365 **********************************/
 366
 367 struct idmap_tdb_allocate_id_context {
 368         const char *hwmkey;
 369         const char *hwmtype;
 370         uint32_t high_hwm;
 371         uint32_t hwm;
 372 };
 373
 374 static NTSTATUS idmap_tdb_allocate_id_action(struct db_context *db,
 375                                              void *private_data)
 376 {
 377         NTSTATUS ret;
 378         struct idmap_tdb_allocate_id_context *state;
 379         uint32_t hwm;
 380
 381         state = (struct idmap_tdb_allocate_id_context *)private_data;
 382
 383         hwm = dbwrap_fetch_int32(db, state->hwmkey);
 384         if (hwm == -1) {
 385                 ret = NT_STATUS_INTERNAL_DB_ERROR;
 386                 goto done;
 387         }
 388
 389         /* check it is in the range */
 390         if (hwm > state->high_hwm) {
 391                 DEBUG(1, ("Fatal Error: %s range full!! (max: %lu)\n",
 392                           state->hwmtype, (unsigned long)state->high_hwm));
 393                 ret = NT_STATUS_UNSUCCESSFUL;
 394                 goto done;
 395         }
 396
 397         /* fetch a new id and increment it */
 398         ret = dbwrap_trans_change_uint32_atomic(db, state->hwmkey, &hwm, 1);
 399         if (!NT_STATUS_IS_OK(ret)) {
 400                 DEBUG(0, ("Fatal error while fetching a new %s value: %s\n!",
 401                           state->hwmtype, nt_errstr(ret)));
 402                 goto done;
 403         }
 404
 405         /* recheck it is in the range */
 406         if (hwm > state->high_hwm) {
 407                 DEBUG(1, ("Fatal Error: %s range full!! (max: %lu)\n",
 408                           state->hwmtype, (unsigned long)state->high_hwm));
 409                 ret = NT_STATUS_UNSUCCESSFUL;
 410                 goto done;
 411         }
 412
 413         ret = NT_STATUS_OK;
 414         state->hwm = hwm;
 415
 416 done:
 417         return ret;
 418 }
 419
 420 static NTSTATUS idmap_tdb_allocate_id(struct idmap_domain *dom,
 421                                       struct unixid *xid)
 422 {
 423         const char *hwmkey;
 424         const char *hwmtype;
 425         uint32_t high_hwm;
 426         uint32_t hwm = 0;
 427         NTSTATUS status;
 428         struct idmap_tdb_allocate_id_context state;
 429         struct idmap_tdb_context *ctx;
 430
 431         ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
 432
 433         /* Get current high water mark */
 434         switch (xid->type) {
 435
 436         case ID_TYPE_UID:
 437                 hwmkey = HWM_USER;
 438                 hwmtype = "UID";
 439                 break;
 440
 441         case ID_TYPE_GID:
 442                 hwmkey = HWM_GROUP;
 443                 hwmtype = "GID";
 444                 break;
 445
 446         default:
 447                 DEBUG(2, ("Invalid ID type (0x%x)\n", xid->type));
 448                 return NT_STATUS_INVALID_PARAMETER;
 449         }
 450
 451         high_hwm = dom->high_id;
 452
 453         state.hwm = hwm;
 454         state.high_hwm = high_hwm;
 455         state.hwmtype = hwmtype;
 456         state.hwmkey = hwmkey;
 457
 458         status = dbwrap_trans_do(ctx->db, idmap_tdb_allocate_id_action,
 459                                  &state);
 460
 461         if (NT_STATUS_IS_OK(status)) {
 462                 xid->id = state.hwm;
 463                 DEBUG(10,("New %s = %d\n", hwmtype, state.hwm));
 464         } else {
 465                 DEBUG(1, ("Error allocating a new %s\n", hwmtype));
 466         }
 467
 468         return status;
 469 }
 470
 471 /**
 472  * Allocate a new unix-ID.
 473  * For now this is for the default idmap domain only.
 474  * Should be extended later on.
 475  */
 476 static NTSTATUS idmap_tdb_get_new_id(struct idmap_domain *dom,
 477                                      struct unixid *id)
 478 {
 479         NTSTATUS ret;
 480
 481         if (!strequal(dom->name, "*")) {
 482                 DEBUG(3, ("idmap_tdb_get_new_id: "
 483                           "Refusing allocation of a new unixid for domain'%s'. "
 484                           "Currently only supported for the default "
 485                           "domain \"*\".\n",
 486                            dom->name));
 487                 return NT_STATUS_NOT_IMPLEMENTED;
 488         }
 489
 490         ret = idmap_tdb_allocate_id(dom, id);
 491
 492         return ret;
 493 }
 494
 495 /**********************************************************************
 496  IDMAP MAPPING TDB BACKEND
 497 **********************************************************************/
 498
 499 /*****************************
 500  Initialise idmap database.
 501 *****************************/
 502
 503 static NTSTATUS idmap_tdb_set_mapping(struct idmap_domain *dom,
 504                                       const struct id_map *map);
 505
 506 static NTSTATUS idmap_tdb_db_init(struct idmap_domain *dom)
 507 {
 508         NTSTATUS ret;
 509         struct idmap_tdb_context *ctx;
 510
 511         DEBUG(10, ("idmap_tdb_db_init called for domain '%s'\n", dom->name));
 512
 513         ctx = talloc_zero(dom, struct idmap_tdb_context);
 514         if ( ! ctx) {
 515                 DEBUG(0, ("Out of memory!\n"));
 516                 return NT_STATUS_NO_MEMORY;
 517         }
 518
 519         /* load backend specific configuration here: */
 520 #if 0
 521         if (strequal(dom->name, "*")) {
 522         } else {
 523         }
 524 #endif
 525
 526         ctx->rw_ops = talloc_zero(ctx, struct idmap_rw_ops);
 527         if (ctx->rw_ops == NULL) {
 528                 DEBUG(0, ("Out of memory!\n"));
 529                 ret = NT_STATUS_NO_MEMORY;
 530                 goto failed;
 531         }
 532
 533         ctx->rw_ops->get_new_id = idmap_tdb_get_new_id;
 534         ctx->rw_ops->set_mapping = idmap_tdb_set_mapping;
 535
 536         dom->private_data = ctx;
 537
 538         ret = idmap_tdb_open_db(dom);
 539         if ( ! NT_STATUS_IS_OK(ret)) {
 540                 goto failed;
 541         }
 542
 543         return NT_STATUS_OK;
 544
 545 failed:
 546         talloc_free(ctx);
 547         return ret;
 548 }
 549
 550
 551 /**
 552  * store a mapping in the database
 553  */
 554
 555 struct idmap_tdb_set_mapping_context {
 556         const char *ksidstr;
 557         const char *kidstr;
 558 };
 559
 560 static NTSTATUS idmap_tdb_set_mapping_action(struct db_context *db,
 561                                              void *private_data)
 562 {
 563         NTSTATUS ret;
 564         struct idmap_tdb_set_mapping_context *state;
 565
 566         state = (struct idmap_tdb_set_mapping_context *)private_data;
 567
 568         DEBUG(10, ("Storing %s <-> %s map\n", state->ksidstr, state->kidstr));
 569
 570         ret = dbwrap_store_bystring(db, state->ksidstr,
 571                                     string_term_tdb_data(state->kidstr),
 572                                     TDB_REPLACE);
 573         if (!NT_STATUS_IS_OK(ret)) {
 574                 DEBUG(0, ("Error storing SID -> ID (%s -> %s): %s\n",
 575                           state->ksidstr, state->kidstr, nt_errstr(ret)));
 576                 goto done;
 577         }
 578
 579         ret = dbwrap_store_bystring(db, state->kidstr,
 580                                     string_term_tdb_data(state->ksidstr),
 581                                     TDB_REPLACE);
 582         if (!NT_STATUS_IS_OK(ret)) {
 583                 DEBUG(0, ("Error storing ID -> SID (%s -> %s): %s\n",
 584                           state->kidstr, state->ksidstr, nt_errstr(ret)));
 585                 goto done;
 586         }
 587
 588         DEBUG(10,("Stored %s <-> %s\n", state->ksidstr, state->kidstr));
 589         ret = NT_STATUS_OK;
 590
 591 done:
 592         return ret;
 593 }
 594
 595 static NTSTATUS idmap_tdb_set_mapping(struct idmap_domain *dom,
 596                                       const struct id_map *map)
 597 {
 598         struct idmap_tdb_context *ctx;
 599         NTSTATUS ret;
 600         char *ksidstr, *kidstr;
 601         struct idmap_tdb_set_mapping_context state;
 602
 603         if (!map || !map->sid) {
 604                 return NT_STATUS_INVALID_PARAMETER;
 605         }
 606
 607         ksidstr = kidstr = NULL;
 608
 609         /* TODO: should we filter a set_mapping using low/high filters ? */
 610
 611         ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
 612
 613         switch (map->xid.type) {
 614
 615         case ID_TYPE_UID:
 616                 kidstr = talloc_asprintf(ctx, "UID %lu",
 617                                          (unsigned long)map->xid.id);
 618                 break;
 619
 620         case ID_TYPE_GID:
 621                 kidstr = talloc_asprintf(ctx, "GID %lu",
 622                                          (unsigned long)map->xid.id);
 623                 break;
 624
 625         default:
 626                 DEBUG(2, ("INVALID unix ID type: 0x02%x\n", map->xid.type));
 627                 return NT_STATUS_INVALID_PARAMETER;
 628         }
 629
 630         if (kidstr == NULL) {
 631                 DEBUG(0, ("ERROR: Out of memory!\n"));
 632                 ret = NT_STATUS_NO_MEMORY;
 633                 goto done;
 634         }
 635
 636         ksidstr = sid_string_talloc(ctx, map->sid);
 637         if (ksidstr == NULL) {
 638                 DEBUG(0, ("Out of memory!\n"));
 639                 ret = NT_STATUS_NO_MEMORY;
 640                 goto done;
 641         }
 642
 643         state.ksidstr = ksidstr;
 644         state.kidstr = kidstr;
 645
 646         ret = dbwrap_trans_do(ctx->db, idmap_tdb_set_mapping_action, &state);
 647
 648 done:
 649         talloc_free(ksidstr);
 650         talloc_free(kidstr);
 651         return ret;
 652 }
 653
 654 /**
 655  * Create a new mapping for an unmapped SID, also allocating a new ID.
 656  * This should be run inside a transaction.
 657  *
 658  * TODO:
 659  * Properly integrate this with multi domain idmap config:
 660  * Currently, the allocator is default-config only.
 661  */
 662 static NTSTATUS idmap_tdb_new_mapping(struct idmap_domain *dom, struct id_map *map)
 663 {
 664         NTSTATUS ret;
 665         struct idmap_tdb_context *ctx;
 666
 667         ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
 668
 669         ret = idmap_rw_new_mapping(dom, ctx->rw_ops, map);
 670
 671         return ret;
 672 }
 673
 674
 675 /**********************************
 676  Single id to sid lookup function.
 677 **********************************/
 678
 679 static NTSTATUS idmap_tdb_id_to_sid(struct idmap_domain *dom, struct id_map *map)
 680 {
 681         NTSTATUS ret;
 682         TDB_DATA data;
 683         char *keystr;
 684         struct idmap_tdb_context *ctx;
 685
 686         if (!dom || !map) {
 687                 return NT_STATUS_INVALID_PARAMETER;
 688         }
 689
 690         ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
 691
 692         /* apply filters before checking */
 693         if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
 694                 DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
 695                                 map->xid.id, dom->low_id, dom->high_id));
 696                 return NT_STATUS_NONE_MAPPED;
 697         }
 698
 699         switch (map->xid.type) {
 700
 701         case ID_TYPE_UID:
 702                 keystr = talloc_asprintf(ctx, "UID %lu", (unsigned long)map->xid.id);
 703                 break;
 704
 705         case ID_TYPE_GID:
 706                 keystr = talloc_asprintf(ctx, "GID %lu", (unsigned long)map->xid.id);
 707                 break;
 708
 709         default:
 710                 DEBUG(2, ("INVALID unix ID type: 0x02%x\n", map->xid.type));
 711                 return NT_STATUS_INVALID_PARAMETER;
 712         }
 713
 714         /* final SAFE_FREE safe */
 715         data.dptr = NULL;
 716
 717         if (keystr == NULL) {
 718                 DEBUG(0, ("Out of memory!\n"));
 719                 ret = NT_STATUS_NO_MEMORY;
 720                 goto done;
 721         }
 722
 723         DEBUG(10,("Fetching record %s\n", keystr));
 724
 725         /* Check if the mapping exists */
 726         data = dbwrap_fetch_bystring(ctx->db, NULL, keystr);
 727
 728         if (!data.dptr) {
 729                 DEBUG(10,("Record %s not found\n", keystr));
 730                 ret = NT_STATUS_NONE_MAPPED;
 731                 goto done;
 732         }
 733
 734         if (!string_to_sid(map->sid, (const char *)data.dptr)) {
 735                 DEBUG(10,("INVALID SID (%s) in record %s\n",
 736                         (const char *)data.dptr, keystr));
 737                 ret = NT_STATUS_INTERNAL_DB_ERROR;
 738                 goto done;
 739         }
 740
 741         DEBUG(10,("Found record %s -> %s\n", keystr, (const char *)data.dptr));
 742         ret = NT_STATUS_OK;
 743
 744 done:
 745         talloc_free(data.dptr);
 746         talloc_free(keystr);
 747         return ret;
 748 }
 749
 750 /**********************************
 751  Single sid to id lookup function.
 752 **********************************/
 753
 754 static NTSTATUS idmap_tdb_sid_to_id(struct idmap_domain *dom, struct id_map *map)
 755 {
 756         NTSTATUS ret;
 757         TDB_DATA data;
 758         char *keystr;
 759         unsigned long rec_id = 0;
 760         struct idmap_tdb_context *ctx;
 761         TALLOC_CTX *tmp_ctx = talloc_stackframe();
 762
 763         ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
 764
 765         keystr = sid_string_talloc(tmp_ctx, map->sid);
 766         if (keystr == NULL) {
 767                 DEBUG(0, ("Out of memory!\n"));
 768                 ret = NT_STATUS_NO_MEMORY;
 769                 goto done;
 770         }
 771
 772         DEBUG(10,("Fetching record %s\n", keystr));
 773
 774         /* Check if sid is present in database */
 775         data = dbwrap_fetch_bystring(ctx->db, tmp_ctx, keystr);
 776         if (!data.dptr) {
 777                 DEBUG(10,("Record %s not found\n", keystr));
 778                 ret = NT_STATUS_NONE_MAPPED;
 779                 goto done;
 780         }
 781
 782         /* What type of record is this ? */
 783         if (sscanf((const char *)data.dptr, "UID %lu", &rec_id) == 1) { /* Try a UID record. */
 784                 map->xid.id = rec_id;
 785                 map->xid.type = ID_TYPE_UID;
 786                 DEBUG(10,("Found uid record %s -> %s \n", keystr, (const char *)data.dptr ));
 787                 ret = NT_STATUS_OK;
 788
 789         } else if (sscanf((const char *)data.dptr, "GID %lu", &rec_id) == 1) { /* Try a GID record. */
 790                 map->xid.id = rec_id;
 791                 map->xid.type = ID_TYPE_GID;
 792                 DEBUG(10,("Found gid record %s -> %s \n", keystr, (const char *)data.dptr ));
 793                 ret = NT_STATUS_OK;
 794
 795         } else { /* Unknown record type ! */
 796                 DEBUG(2, ("Found INVALID record %s -> %s\n", keystr, (const char *)data.dptr));
 797                 ret = NT_STATUS_INTERNAL_DB_ERROR;
 798                 goto done;
 799         }
 800
 801         /* apply filters before returning result */
 802         if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
 803                 DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
 804                                 map->xid.id, dom->low_id, dom->high_id));
 805                 ret = NT_STATUS_NONE_MAPPED;
 806         }
 807
 808 done:
 809         talloc_free(tmp_ctx);
 810         return ret;
 811 }
 812
 813 /**********************************
 814  lookup a set of unix ids.
 815 **********************************/
 816
 817 static NTSTATUS idmap_tdb_unixids_to_sids(struct idmap_domain *dom, struct id_map **ids)
 818 {
 819         NTSTATUS ret;
 820         int i;
 821
 822         /* initialize the status to avoid suprise */
 823         for (i = 0; ids[i]; i++) {
 824                 ids[i]->status = ID_UNKNOWN;
 825         }
 826
 827         for (i = 0; ids[i]; i++) {
 828                 ret = idmap_tdb_id_to_sid(dom, ids[i]);
 829                 if ( ! NT_STATUS_IS_OK(ret)) {
 830
 831                         /* if it is just a failed mapping continue */
 832                         if (NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED)) {
 833
 834                                 /* make sure it is marked as unmapped */
 835                                 ids[i]->status = ID_UNMAPPED;
 836                                 continue;
 837                         }
 838
 839                         /* some fatal error occurred, return immediately */
 840                         goto done;
 841                 }
 842
 843                 /* all ok, id is mapped */
 844                 ids[i]->status = ID_MAPPED;
 845         }
 846
 847         ret = NT_STATUS_OK;
 848
 849 done:
 850         return ret;
 851 }
 852
 853 /**********************************
 854  lookup a set of sids.
 855 **********************************/
 856
 857 struct idmap_tdb_sids_to_unixids_context {
 858         struct idmap_domain *dom;
 859         struct id_map **ids;
 860         bool allocate_unmapped;
 861 };
 862
 863 static NTSTATUS idmap_tdb_sids_to_unixids_action(struct db_context *db,
 864                                                  void *private_data)
 865 {
 866         struct idmap_tdb_sids_to_unixids_context *state;
 867         int i;
 868         NTSTATUS ret = NT_STATUS_OK;
 869
 870         state = (struct idmap_tdb_sids_to_unixids_context *)private_data;
 871
 872         DEBUG(10, ("idmap_tdb_sids_to_unixids_action: "
 873                    " domain: [%s], allocate: %s\n",
 874                    state->dom->name,
 875                    state->allocate_unmapped ? "yes" : "no"));
 876
 877         for (i = 0; state->ids[i]; i++) {
 878                 if ((state->ids[i]->status == ID_UNKNOWN) ||
 879                     /* retry if we could not map in previous run: */
 880                     (state->ids[i]->status == ID_UNMAPPED))
 881                 {
 882                         NTSTATUS ret2;
 883
 884                         ret2 = idmap_tdb_sid_to_id(state->dom, state->ids[i]);
 885                         if (!NT_STATUS_IS_OK(ret2)) {
 886
 887                                 /* if it is just a failed mapping, continue */
 888                                 if (NT_STATUS_EQUAL(ret2, NT_STATUS_NONE_MAPPED)) {
 889
 890                                         /* make sure it is marked as unmapped */
 891                                         state->ids[i]->status = ID_UNMAPPED;
 892                                         ret = STATUS_SOME_UNMAPPED;
 893                                 } else {
 894                                         /* some fatal error occurred, return immediately */
 895                                         ret = ret2;
 896                                         goto done;
 897                                 }
 898                         } else {
 899                                 /* all ok, id is mapped */
 900                                 state->ids[i]->status = ID_MAPPED;
 901                         }
 902                 }
 903
 904                 if ((state->ids[i]->status == ID_UNMAPPED) &&
 905                     state->allocate_unmapped)
 906                 {
 907                         ret = idmap_tdb_new_mapping(state->dom, state->ids[i]);
 908                         if (!NT_STATUS_IS_OK(ret)) {
 909                                 goto done;
 910                         }
 911                 }
 912         }
 913
 914 done:
 915         return ret;
 916 }
 917
 918 static NTSTATUS idmap_tdb_sids_to_unixids(struct idmap_domain *dom, struct id_map **ids)
 919 {
 920         struct idmap_tdb_context *ctx;
 921         NTSTATUS ret;
 922         int i;
 923         struct idmap_tdb_sids_to_unixids_context state;
 924
 925         /* initialize the status to avoid suprise */
 926         for (i = 0; ids[i]; i++) {
 927                 ids[i]->status = ID_UNKNOWN;
 928         }
 929
 930         ctx = talloc_get_type(dom->private_data, struct idmap_tdb_context);
 931
 932         state.dom = dom;
 933         state.ids = ids;
 934         state.allocate_unmapped = false;
 935
 936         ret = idmap_tdb_sids_to_unixids_action(ctx->db, &state);
 937
 938         if (NT_STATUS_EQUAL(ret, STATUS_SOME_UNMAPPED) && !dom->read_only) {
 939                 state.allocate_unmapped = true;
 940                 ret = dbwrap_trans_do(ctx->db,
 941                                       idmap_tdb_sids_to_unixids_action,
 942                                       &state);
 943         }
 944
 945         return ret;
 946 }
 947
 948
 949 /**********************************
 950  Close the idmap tdb instance
 951 **********************************/
 952
 953 static struct idmap_methods db_methods = {
 954         .init = idmap_tdb_db_init,
 955         .unixids_to_sids = idmap_tdb_unixids_to_sids,
 956         .sids_to_unixids = idmap_tdb_sids_to_unixids,
 957         .allocate_id = idmap_tdb_get_new_id,
 958 };
 959
 960 NTSTATUS idmap_tdb_init(void)
 961 {
 962         DEBUG(10, ("calling idmap_tdb_init\n"));
 963
 964         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "tdb", &db_methods);
 965 }