source3/winbindd/idmap_tdb_common.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    common functions for TDB based idmapping backends
   5
   6    Copyright (C) Christian Ambach 2012
   7
   8    These functions were initially copied over from idmap_tdb.c and idmap_tdb2.c
   9    which are:
  10
  11    Copyright (C) Tim Potter 2000
  12    Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
  13    Copyright (C) Jeremy Allison 2006
  14    Copyright (C) Simo Sorce 2003-2006
  15    Copyright (C) Michael Adam 2009-2010
  16    Copyright (C) Andrew Tridgell 2007
  17
  18    This program is free software; you can redistribute it and/or modify
  19    it under the terms of the GNU General Public License as published by
  20    the Free Software Foundation; either version 2 of the License, or
  21    (at your option) any later version.
  22
  23    This program is distributed in the hope that it will be useful,
  24    but WITHOUT ANY WARRANTY; without even the implied warranty of
  25    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26    GNU General Public License for more details.
  27
  28    You should have received a copy of the GNU General Public License
  29    along with this program; if not, write to the Free Software
  30    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  31 */
  32
  33 #include "includes.h"
  34 #include "idmap_tdb_common.h"
  35 #include "dbwrap/dbwrap.h"
  36 #include "util_tdb.h"
  37 #include "idmap_rw.h"
  38 #include "../libcli/security/dom_sid.h"
  39
  40 #undef DBGC_CLASS
  41 #define DBGC_CLASS DBGC_IDMAP
  42
  43 struct idmap_tdb_common_allocate_id_context {
  44         const char *hwmkey;
  45         const char *hwmtype;
  46         uint32_t high_hwm;
  47         uint32_t hwm;
  48 };
  49
  50 static NTSTATUS idmap_tdb_common_allocate_id_action(struct db_context *db,
  51                                                     void *private_data)
  52 {
  53         NTSTATUS ret;
  54         struct idmap_tdb_common_allocate_id_context *state;
  55         uint32_t hwm;
  56
  57         state = (struct idmap_tdb_common_allocate_id_context *)private_data;
  58
  59         ret = dbwrap_fetch_uint32_bystring(db, state->hwmkey, &hwm);
  60         if (!NT_STATUS_IS_OK(ret)) {
  61                 ret = NT_STATUS_INTERNAL_DB_ERROR;
  62                 goto done;
  63         }
  64
  65         /* check it is in the range */
  66         if (hwm > state->high_hwm) {
  67                 DEBUG(1, ("Fatal Error: %s range full!! (max: %lu)\n",
  68                           state->hwmtype, (unsigned long)state->high_hwm));
  69                 ret = NT_STATUS_UNSUCCESSFUL;
  70                 goto done;
  71         }
  72
  73         /* fetch a new id and increment it */
  74         ret = dbwrap_change_uint32_atomic_bystring(db, state->hwmkey, &hwm, 1);
  75         if (!NT_STATUS_IS_OK(ret)) {
  76                 DEBUG(1, ("Fatal error while fetching a new %s value\n!",
  77                           state->hwmtype));
  78                 goto done;
  79         }
  80
  81         /* recheck it is in the range */
  82         if (hwm > state->high_hwm) {
  83                 DEBUG(1, ("Fatal Error: %s range full!! (max: %lu)\n",
  84                           state->hwmtype, (unsigned long)state->high_hwm));
  85                 ret = NT_STATUS_UNSUCCESSFUL;
  86                 goto done;
  87         }
  88
  89         ret = NT_STATUS_OK;
  90         state->hwm = hwm;
  91
  92       done:
  93         return ret;
  94 }
  95
  96 static NTSTATUS idmap_tdb_common_allocate_id(struct idmap_domain *dom,
  97                                              struct unixid *xid)
  98 {
  99         const char *hwmkey;
 100         const char *hwmtype;
 101         uint32_t hwm = 0;
 102         NTSTATUS status;
 103         struct idmap_tdb_common_allocate_id_context state;
 104         struct idmap_tdb_common_context *ctx;
 105
 106         ctx =
 107             talloc_get_type_abort(dom->private_data,
 108                                   struct idmap_tdb_common_context);
 109
 110         /* Get current high water mark */
 111         switch (xid->type) {
 112
 113         case ID_TYPE_UID:
 114                 hwmkey = ctx->hwmkey_uid;
 115                 hwmtype = "UID";
 116                 break;
 117
 118         case ID_TYPE_GID:
 119                 hwmkey = ctx->hwmkey_gid;
 120                 hwmtype = "GID";
 121                 break;
 122
 123         default:
 124                 DEBUG(2, ("Invalid ID type (0x%x)\n", xid->type));
 125                 return NT_STATUS_INVALID_PARAMETER;
 126         }
 127
 128         state.hwm = hwm;
 129         state.high_hwm = ctx->max_id;
 130         state.hwmtype = hwmtype;
 131         state.hwmkey = hwmkey;
 132
 133         status = dbwrap_trans_do(ctx->db, idmap_tdb_common_allocate_id_action,
 134                                  &state);
 135
 136         if (NT_STATUS_IS_OK(status)) {
 137                 xid->id = state.hwm;
 138                 DEBUG(10, ("New %s = %d\n", hwmtype, state.hwm));
 139         } else {
 140                 DEBUG(1, ("Error allocating a new %s\n", hwmtype));
 141         }
 142
 143         return status;
 144 }
 145
 146 /**
 147  * Allocate a new unix-ID.
 148  * For now this is for the default idmap domain only.
 149  * Should be extended later on.
 150  */
 151 NTSTATUS idmap_tdb_common_get_new_id(struct idmap_domain * dom,
 152                                      struct unixid * id)
 153 {
 154         NTSTATUS ret;
 155
 156         if (!strequal(dom->name, "*")) {
 157                 DEBUG(3, ("idmap_tdb_common_get_new_id: "
 158                           "Refusing allocation of a new unixid for domain'%s'. "
 159                           "Currently only supported for the default "
 160                           "domain \"*\".\n", dom->name));
 161                 return NT_STATUS_NOT_IMPLEMENTED;
 162         }
 163
 164         ret = idmap_tdb_common_allocate_id(dom, id);
 165
 166         return ret;
 167 }
 168
 169 /**
 170  * store a mapping in the database.
 171  */
 172
 173 struct idmap_tdb_common_set_mapping_context {
 174         const char *ksidstr;
 175         const char *kidstr;
 176 };
 177
 178 static NTSTATUS idmap_tdb_common_set_mapping_action(struct db_context *db,
 179                                                     void *private_data)
 180 {
 181         TDB_DATA data;
 182         NTSTATUS ret;
 183         struct idmap_tdb_common_set_mapping_context *state;
 184         TALLOC_CTX *tmp_ctx = talloc_stackframe();
 185
 186         state = (struct idmap_tdb_common_set_mapping_context *)private_data;
 187
 188         DEBUG(10, ("Storing %s <-> %s map\n", state->ksidstr, state->kidstr));
 189
 190         /* check whether sid mapping is already present in db */
 191         ret = dbwrap_fetch_bystring(db, tmp_ctx, state->ksidstr, &data);
 192         if (NT_STATUS_IS_OK(ret)) {
 193                 ret = NT_STATUS_OBJECT_NAME_COLLISION;
 194                 goto done;
 195         }
 196
 197         ret = dbwrap_store_bystring(db, state->ksidstr,
 198                                     string_term_tdb_data(state->kidstr),
 199                                     TDB_INSERT);
 200         if (!NT_STATUS_IS_OK(ret)) {
 201                 DEBUG(0, ("Error storing SID -> ID: %s\n", nt_errstr(ret)));
 202                 goto done;
 203         }
 204
 205         ret = dbwrap_store_bystring(db, state->kidstr,
 206                                     string_term_tdb_data(state->ksidstr),
 207                                     TDB_INSERT);
 208         if (!NT_STATUS_IS_OK(ret)) {
 209                 DEBUG(0, ("Error storing ID -> SID: %s\n", nt_errstr(ret)));
 210                 /* try to remove the previous stored SID -> ID map */
 211                 dbwrap_delete_bystring(db, state->ksidstr);
 212                 goto done;
 213         }
 214
 215         DEBUG(10, ("Stored %s <-> %s\n", state->ksidstr, state->kidstr));
 216
 217       done:
 218         talloc_free(tmp_ctx);
 219         return ret;
 220 }
 221
 222 NTSTATUS idmap_tdb_common_set_mapping(struct idmap_domain * dom,
 223                                       const struct id_map * map)
 224 {
 225         struct idmap_tdb_common_context *ctx;
 226         struct idmap_tdb_common_set_mapping_context state;
 227         NTSTATUS ret;
 228         char *ksidstr, *kidstr;
 229
 230         if (!map || !map->sid) {
 231                 return NT_STATUS_INVALID_PARAMETER;
 232         }
 233
 234         ksidstr = kidstr = NULL;
 235
 236         /* TODO: should we filter a set_mapping using low/high filters ? */
 237
 238         ctx =
 239             talloc_get_type_abort(dom->private_data,
 240                                   struct idmap_tdb_common_context);
 241
 242         switch (map->xid.type) {
 243
 244         case ID_TYPE_UID:
 245                 kidstr =
 246                     talloc_asprintf(ctx, "UID %lu", (unsigned long)map->xid.id);
 247                 break;
 248
 249         case ID_TYPE_GID:
 250                 kidstr =
 251                     talloc_asprintf(ctx, "GID %lu", (unsigned long)map->xid.id);
 252                 break;
 253
 254         default:
 255                 DEBUG(2, ("INVALID unix ID type: 0x02%x\n", map->xid.type));
 256                 return NT_STATUS_INVALID_PARAMETER;
 257         }
 258
 259         if (kidstr == NULL) {
 260                 DEBUG(0, ("ERROR: Out of memory!\n"));
 261                 ret = NT_STATUS_NO_MEMORY;
 262                 goto done;
 263         }
 264
 265         ksidstr = sid_string_talloc(ctx, map->sid);
 266         if (ksidstr == NULL) {
 267                 DEBUG(0, ("Out of memory!\n"));
 268                 ret = NT_STATUS_NO_MEMORY;
 269                 goto done;
 270         }
 271
 272         state.ksidstr = ksidstr;
 273         state.kidstr = kidstr;
 274
 275         ret = dbwrap_trans_do(ctx->db, idmap_tdb_common_set_mapping_action,
 276                               &state);
 277
 278       done:
 279         talloc_free(ksidstr);
 280         talloc_free(kidstr);
 281         return ret;
 282 }
 283
 284 /*
 285  * Create a new mapping for an unmapped SID, also allocating a new ID.
 286  * This should be run inside a transaction.
 287  *
 288  * TODO:
 289  *  Properly integrate this with multi domain idmap config:
 290  *  Currently, the allocator is default-config only.
 291  */
 292 NTSTATUS idmap_tdb_common_new_mapping(struct idmap_domain * dom,
 293                                       struct id_map * map)
 294 {
 295         NTSTATUS ret;
 296         struct idmap_tdb_common_context *ctx;
 297
 298         ctx =
 299             talloc_get_type_abort(dom->private_data,
 300                                   struct idmap_tdb_common_context);
 301
 302         ret = idmap_rw_new_mapping(dom, ctx->rw_ops, map);
 303
 304         return ret;
 305 }
 306
 307 /*
 308   lookup a set of unix ids
 309 */
 310 NTSTATUS idmap_tdb_common_unixids_to_sids(struct idmap_domain * dom,
 311                                           struct id_map ** ids)
 312 {
 313         NTSTATUS ret;
 314         int i, num_mapped = 0;
 315         struct idmap_tdb_common_context *ctx;
 316
 317         NTSTATUS(*unixid_to_sid_fn) (struct idmap_domain * dom,
 318                                      struct id_map * map);
 319         ctx =
 320             talloc_get_type_abort(dom->private_data,
 321                                   struct idmap_tdb_common_context);
 322
 323         if (ctx->unixid_to_sid_fn == NULL) {
 324                 unixid_to_sid_fn = idmap_tdb_common_unixid_to_sid;
 325         } else {
 326                 unixid_to_sid_fn = ctx->unixid_to_sid_fn;
 327         }
 328
 329         /* initialize the status to avoid surprise */
 330         for (i = 0; ids[i]; i++) {
 331                 ids[i]->status = ID_UNKNOWN;
 332         }
 333
 334         for (i = 0; ids[i]; i++) {
 335                 ret = unixid_to_sid_fn(dom, ids[i]);
 336                 if (!NT_STATUS_IS_OK(ret)) {
 337
 338                         /* if it is just a failed mapping continue */
 339                         if (NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED)) {
 340
 341                                 /* make sure it is marked as unmapped */
 342                                 ids[i]->status = ID_UNMAPPED;
 343                                 continue;
 344                         }
 345
 346                         /* some fatal error occurred, return immediately */
 347                         goto done;
 348                 }
 349
 350                 /* all ok, id is mapped */
 351                 ids[i]->status = ID_MAPPED;
 352                 num_mapped += 1;
 353         }
 354
 355         ret = NT_STATUS_OK;
 356
 357 done:
 358
 359         if (NT_STATUS_IS_OK(ret)) {
 360                 if (i == 0 || num_mapped == 0) {
 361                         ret = NT_STATUS_NONE_MAPPED;
 362                 } else if (num_mapped < i) {
 363                         ret = STATUS_SOME_UNMAPPED;
 364                 } else {
 365                         ret = NT_STATUS_OK;
 366                 }
 367         }
 368
 369         return ret;
 370 }
 371
 372 /*
 373   default single id to sid lookup function
 374 */
 375 NTSTATUS idmap_tdb_common_unixid_to_sid(struct idmap_domain * dom,
 376                                         struct id_map * map)
 377 {
 378         NTSTATUS ret;
 379         TDB_DATA data;
 380         char *keystr;
 381         struct idmap_tdb_common_context *ctx;
 382
 383         if (!dom || !map) {
 384                 return NT_STATUS_INVALID_PARAMETER;
 385         }
 386 /* TODO: do we really make sure the database is open again? should have been
 387  * done while initing the module
 388         status = idmap_tdb2_open_db(dom);
 389         NT_STATUS_NOT_OK_RETURN(status);
 390 */
 391         ctx =
 392             talloc_get_type_abort(dom->private_data,
 393                                   struct idmap_tdb_common_context);
 394
 395         /* apply filters before checking */
 396         if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
 397                 DEBUG(5,
 398                       ("Requested id (%u) out of range (%u - %u). Filtered!\n",
 399                        map->xid.id, dom->low_id, dom->high_id));
 400                 return NT_STATUS_NONE_MAPPED;
 401         }
 402
 403         switch (map->xid.type) {
 404
 405         case ID_TYPE_UID:
 406                 keystr =
 407                     talloc_asprintf(ctx, "UID %lu", (unsigned long)map->xid.id);
 408                 break;
 409
 410         case ID_TYPE_GID:
 411                 keystr =
 412                     talloc_asprintf(ctx, "GID %lu", (unsigned long)map->xid.id);
 413                 break;
 414
 415         default:
 416                 DEBUG(2, ("INVALID unix ID type: 0x02%x\n", map->xid.type));
 417                 return NT_STATUS_INVALID_PARAMETER;
 418         }
 419
 420         if (keystr == NULL) {
 421                 DEBUG(0, ("Out of memory!\n"));
 422                 ret = NT_STATUS_NO_MEMORY;
 423                 goto done;
 424         }
 425
 426         DEBUG(10, ("Fetching record %s\n", keystr));
 427
 428         /* Check if the mapping exists */
 429         ret = dbwrap_fetch_bystring(ctx->db, keystr, keystr, &data);
 430
 431         if (!NT_STATUS_IS_OK(ret)) {
 432                 DEBUG(10, ("Record %s not found\n", keystr));
 433                 ret = NT_STATUS_NONE_MAPPED;
 434                 goto done;
 435         }
 436
 437         if (!string_to_sid(map->sid, (const char *)data.dptr)) {
 438                 DEBUG(10, ("INVALID SID (%s) in record %s\n",
 439                            (const char *)data.dptr, keystr));
 440                 ret = NT_STATUS_INTERNAL_DB_ERROR;
 441                 goto done;
 442         }
 443
 444         DEBUG(10, ("Found record %s -> %s\n", keystr, (const char *)data.dptr));
 445         ret = NT_STATUS_OK;
 446
 447       done:
 448         talloc_free(keystr);
 449         return ret;
 450 }
 451
 452 /**********************************
 453  Single sid to id lookup function.
 454 **********************************/
 455
 456 NTSTATUS idmap_tdb_common_sid_to_unixid(struct idmap_domain * dom,
 457                                         struct id_map * map)
 458 {
 459         NTSTATUS ret;
 460         TDB_DATA data;
 461         char *keystr;
 462         unsigned long rec_id = 0;
 463         struct idmap_tdb_common_context *ctx;
 464         TALLOC_CTX *tmp_ctx = talloc_stackframe();
 465
 466         if (!dom || !map) {
 467                 talloc_free(tmp_ctx);
 468                 return NT_STATUS_INVALID_PARAMETER;
 469         }
 470
 471         ctx =
 472             talloc_get_type_abort(dom->private_data,
 473                                   struct idmap_tdb_common_context);
 474
 475         keystr = sid_string_talloc(tmp_ctx, map->sid);
 476         if (keystr == NULL) {
 477                 DEBUG(0, ("Out of memory!\n"));
 478                 ret = NT_STATUS_NO_MEMORY;
 479                 goto done;
 480         }
 481
 482         DEBUG(10, ("Fetching record %s\n", keystr));
 483
 484         /* Check if sid is present in database */
 485         ret = dbwrap_fetch_bystring(ctx->db, tmp_ctx, keystr, &data);
 486         if (!NT_STATUS_IS_OK(ret)) {
 487                 DEBUG(10, ("Record %s not found\n", keystr));
 488                 ret = NT_STATUS_NONE_MAPPED;
 489                 goto done;
 490         }
 491
 492         /* What type of record is this ? */
 493         if (sscanf((const char *)data.dptr, "UID %lu", &rec_id) == 1) {
 494                 /* Try a UID record. */
 495                 map->xid.id = rec_id;
 496                 map->xid.type = ID_TYPE_UID;
 497                 DEBUG(10,
 498                       ("Found uid record %s -> %s \n", keystr,
 499                        (const char *)data.dptr));
 500                 ret = NT_STATUS_OK;
 501
 502         } else if (sscanf((const char *)data.dptr, "GID %lu", &rec_id) == 1) {
 503                 /* Try a GID record. */
 504                 map->xid.id = rec_id;
 505                 map->xid.type = ID_TYPE_GID;
 506                 DEBUG(10,
 507                       ("Found gid record %s -> %s \n", keystr,
 508                        (const char *)data.dptr));
 509                 ret = NT_STATUS_OK;
 510
 511         } else {                /* Unknown record type ! */
 512                 DEBUG(2,
 513                       ("Found INVALID record %s -> %s\n", keystr,
 514                        (const char *)data.dptr));
 515                 ret = NT_STATUS_INTERNAL_DB_ERROR;
 516                 goto done;
 517         }
 518
 519         /* apply filters before returning result */
 520         if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
 521                 DEBUG(5,
 522                       ("Requested id (%u) out of range (%u - %u). Filtered!\n",
 523                        map->xid.id, dom->low_id, dom->high_id));
 524                 ret = NT_STATUS_NONE_MAPPED;
 525         }
 526
 527       done:
 528         talloc_free(tmp_ctx);
 529         return ret;
 530 }
 531
 532 /**********************************
 533  lookup a set of sids
 534 **********************************/
 535
 536 struct idmap_tdb_common_sids_to_unixids_context {
 537         struct idmap_domain *dom;
 538         struct id_map **ids;
 539         bool allocate_unmapped;
 540          NTSTATUS(*sid_to_unixid_fn) (struct idmap_domain * dom,
 541                                       struct id_map * map);
 542 };
 543
 544 static NTSTATUS idmap_tdb_common_sids_to_unixids_action(struct db_context *db,
 545                                                         void *private_data)
 546 {
 547         struct idmap_tdb_common_sids_to_unixids_context *state;
 548         int i, num_mapped = 0;
 549         NTSTATUS ret = NT_STATUS_OK;
 550
 551         state = (struct idmap_tdb_common_sids_to_unixids_context *)private_data;
 552
 553         DEBUG(10, ("idmap_tdb_common_sids_to_unixids: "
 554                    " domain: [%s], allocate: %s\n",
 555                    state->dom->name, state->allocate_unmapped ? "yes" : "no"));
 556
 557         for (i = 0; state->ids[i]; i++) {
 558                 if ((state->ids[i]->status == ID_UNKNOWN) ||
 559                     /* retry if we could not map in previous run: */
 560                     (state->ids[i]->status == ID_UNMAPPED)) {
 561                         NTSTATUS ret2;
 562
 563                         ret2 = state->sid_to_unixid_fn(state->dom,
 564                                         state->ids[i]);
 565
 566                         if (!NT_STATUS_IS_OK(ret2)) {
 567
 568                                 /* if it is just a failed mapping, continue */
 569                                 if (NT_STATUS_EQUAL
 570                                     (ret2, NT_STATUS_NONE_MAPPED)) {
 571
 572                                         /* make sure it is marked as unmapped */
 573                                         state->ids[i]->status = ID_UNMAPPED;
 574                                         ret = STATUS_SOME_UNMAPPED;
 575                                 } else {
 576                                         /*
 577                                          * some fatal error occurred,
 578                                          * return immediately
 579                                          */
 580                                         ret = ret2;
 581                                         goto done;
 582                                 }
 583                         } else {
 584                                 /* all ok, id is mapped */
 585                                 state->ids[i]->status = ID_MAPPED;
 586                         }
 587                 }
 588
 589                 if (state->ids[i]->status == ID_MAPPED) {
 590                         num_mapped += 1;
 591                 }
 592
 593                 if ((state->ids[i]->status == ID_UNMAPPED) &&
 594                     state->allocate_unmapped) {
 595                         ret =
 596                             idmap_tdb_common_new_mapping(state->dom,
 597                                                          state->ids[i]);
 598                         if (!NT_STATUS_IS_OK(ret)) {
 599                                 goto done;
 600                         }
 601                         num_mapped += 1;
 602                 }
 603         }
 604
 605 done:
 606
 607         if (NT_STATUS_IS_OK(ret) ||
 608             NT_STATUS_EQUAL(ret, STATUS_SOME_UNMAPPED)) {
 609                 if (i == 0 || num_mapped == 0) {
 610                         ret = NT_STATUS_NONE_MAPPED;
 611                 } else if (num_mapped < i) {
 612                         ret = STATUS_SOME_UNMAPPED;
 613                 } else {
 614                         ret = NT_STATUS_OK;
 615                 }
 616         }
 617
 618         return ret;
 619 }
 620
 621 NTSTATUS idmap_tdb_common_sids_to_unixids(struct idmap_domain * dom,
 622                                           struct id_map ** ids)
 623 {
 624         NTSTATUS ret;
 625         int i;
 626         struct idmap_tdb_common_sids_to_unixids_context state;
 627         struct idmap_tdb_common_context *ctx;
 628
 629         ctx =
 630             talloc_get_type_abort(dom->private_data,
 631                                   struct idmap_tdb_common_context);
 632
 633         /* initialize the status to avoid surprise */
 634         for (i = 0; ids[i]; i++) {
 635                 ids[i]->status = ID_UNKNOWN;
 636         }
 637
 638         state.dom = dom;
 639         state.ids = ids;
 640         state.allocate_unmapped = false;
 641         if (ctx->sid_to_unixid_fn == NULL) {
 642                 state.sid_to_unixid_fn = idmap_tdb_common_sid_to_unixid;
 643         } else {
 644                 state.sid_to_unixid_fn = ctx->sid_to_unixid_fn;
 645         }
 646
 647         ret = idmap_tdb_common_sids_to_unixids_action(ctx->db, &state);
 648
 649         if ( (NT_STATUS_EQUAL(ret, STATUS_SOME_UNMAPPED) ||
 650               NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED)) &&
 651              !dom->read_only) {
 652                 state.allocate_unmapped = true;
 653                 ret = dbwrap_trans_do(ctx->db,
 654                                       idmap_tdb_common_sids_to_unixids_action,
 655                                       &state);
 656         }
 657
 658         return ret;
 659 }