source3/winbindd/idmap_tdb2.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    idmap TDB2 backend, used for clustered Samba setups.
   5
   6    This uses dbwrap to access tdb files. The location can be set
   7    using tdb:idmap2.tdb =" in smb.conf
   8
   9    Copyright (C) Andrew Tridgell 2007
  10
  11    This is heavily based upon idmap_tdb.c, which is:
  12
  13    Copyright (C) Tim Potter 2000
  14    Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
  15    Copyright (C) Jeremy Allison 2006
  16    Copyright (C) Simo Sorce 2003-2006
  17    Copyright (C) Michael Adam 2009-2010
  18
  19    This program is free software; you can redistribute it and/or modify
  20    it under the terms of the GNU General Public License as published by
  21    the Free Software Foundation; either version 2 of the License, or
  22    (at your option) any later version.
  23
  24    This program is distributed in the hope that it will be useful,
  25    but WITHOUT ANY WARRANTY; without even the implied warranty of
  26    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27    GNU General Public License for more details.
  28
  29    You should have received a copy of the GNU General Public License
  30    along with this program; if not, write to the Free Software
  31    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  32 */
  33
  34 #include "includes.h"
  35 #include "system/filesys.h"
  36 #include "winbindd.h"
  37 #include "idmap.h"
  38 #include "idmap_rw.h"
  39 #include "dbwrap/dbwrap.h"
  40 #include "dbwrap/dbwrap_open.h"
  41 #include "../libcli/security/dom_sid.h"
  42 #include "util_tdb.h"
  43 #include "idmap_tdb_common.h"
  44
  45 #undef DBGC_CLASS
  46 #define DBGC_CLASS DBGC_IDMAP
  47
  48 struct idmap_tdb2_context {
  49         const char *script; /* script to provide idmaps */
  50 };
  51
  52 /* High water mark keys */
  53 #define HWM_GROUP  "GROUP HWM"
  54 #define HWM_USER   "USER HWM"
  55
  56 /*
  57  * check and initialize high/low water marks in the db
  58  */
  59 static NTSTATUS idmap_tdb2_init_hwm(struct idmap_domain *dom)
  60 {
  61         NTSTATUS status;
  62         uint32_t low_id;
  63         struct idmap_tdb_common_context *ctx;
  64
  65         ctx = talloc_get_type(dom->private_data,
  66                               struct idmap_tdb_common_context);
  67
  68         /* Create high water marks for group and user id */
  69
  70         status = dbwrap_fetch_uint32_bystring(ctx->db, HWM_USER, &low_id);
  71         if (!NT_STATUS_IS_OK(status) || (low_id < dom->low_id)) {
  72                 status = dbwrap_trans_store_uint32_bystring(ctx->db, HWM_USER,
  73                                                             dom->low_id);
  74                 if (!NT_STATUS_IS_OK(status)) {
  75                         DEBUG(0, ("Unable to initialise user hwm in idmap "
  76                                   "database: %s\n", nt_errstr(status)));
  77                         return NT_STATUS_INTERNAL_DB_ERROR;
  78                 }
  79         }
  80
  81         status = dbwrap_fetch_uint32_bystring(ctx->db, HWM_GROUP, &low_id);
  82         if (!NT_STATUS_IS_OK(status) || (low_id < dom->low_id)) {
  83                 status = dbwrap_trans_store_uint32_bystring(ctx->db, HWM_GROUP,
  84                                                             dom->low_id);
  85                 if (!NT_STATUS_IS_OK(status)) {
  86                         DEBUG(0, ("Unable to initialise group hwm in idmap "
  87                                   "database: %s\n", nt_errstr(status)));
  88                         return NT_STATUS_INTERNAL_DB_ERROR;
  89                 }
  90         }
  91
  92         return NT_STATUS_OK;
  93 }
  94
  95
  96 /*
  97   open the permanent tdb
  98  */
  99 static NTSTATUS idmap_tdb2_open_db(struct idmap_domain *dom)
 100 {
 101         char *db_path;
 102         struct idmap_tdb_common_context *ctx;
 103
 104         ctx = talloc_get_type(dom->private_data,
 105                               struct idmap_tdb_common_context);
 106
 107         if (ctx->db) {
 108                 /* its already open */
 109                 return NT_STATUS_OK;
 110         }
 111
 112         db_path = talloc_asprintf(NULL, "%s/idmap2.tdb", lp_private_dir());
 113         NT_STATUS_HAVE_NO_MEMORY(db_path);
 114
 115         /* Open idmap repository */
 116         ctx->db = db_open(ctx, db_path, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0644,
 117                           DBWRAP_LOCK_ORDER_1, DBWRAP_FLAG_NONE);
 118         if (ctx->db == NULL) {
 119                 DEBUG(0, ("Unable to open idmap_tdb2 database '%s'\n",
 120                           db_path));
 121                 TALLOC_FREE(db_path);
 122                 return NT_STATUS_UNSUCCESSFUL;
 123         }
 124         TALLOC_FREE(db_path);
 125
 126         return idmap_tdb2_init_hwm(dom);
 127 }
 128
 129 /**
 130  * store a mapping in the database.
 131  */
 132
 133 struct idmap_tdb2_set_mapping_context {
 134         const char *ksidstr;
 135         const char *kidstr;
 136 };
 137
 138 static NTSTATUS idmap_tdb2_set_mapping_action(struct db_context *db,
 139                                               void *private_data)
 140 {
 141         TDB_DATA data;
 142         NTSTATUS ret;
 143         struct idmap_tdb2_set_mapping_context *state;
 144         TALLOC_CTX *tmp_ctx = talloc_stackframe();
 145
 146         state = (struct idmap_tdb2_set_mapping_context *)private_data;
 147
 148         DEBUG(10, ("Storing %s <-> %s map\n", state->ksidstr, state->kidstr));
 149
 150         /* check wheter sid mapping is already present in db */
 151         ret = dbwrap_fetch_bystring(db, tmp_ctx, state->ksidstr, &data);
 152         if (NT_STATUS_IS_OK(ret)) {
 153                 ret = NT_STATUS_OBJECT_NAME_COLLISION;
 154                 goto done;
 155         }
 156
 157         ret = dbwrap_store_bystring(db, state->ksidstr,
 158                                     string_term_tdb_data(state->kidstr),
 159                                     TDB_INSERT);
 160         if (!NT_STATUS_IS_OK(ret)) {
 161                 DEBUG(0, ("Error storing SID -> ID: %s\n", nt_errstr(ret)));
 162                 goto done;
 163         }
 164
 165         ret = dbwrap_store_bystring(db, state->kidstr,
 166                                     string_term_tdb_data(state->ksidstr),
 167                                     TDB_INSERT);
 168         if (!NT_STATUS_IS_OK(ret)) {
 169                 DEBUG(0, ("Error storing ID -> SID: %s\n", nt_errstr(ret)));
 170                 /* try to remove the previous stored SID -> ID map */
 171                 dbwrap_delete_bystring(db, state->ksidstr);
 172                 goto done;
 173         }
 174
 175         DEBUG(10,("Stored %s <-> %s\n", state->ksidstr, state->kidstr));
 176
 177 done:
 178         talloc_free(tmp_ctx);
 179         return ret;
 180 }
 181
 182 static NTSTATUS idmap_tdb2_set_mapping(struct idmap_domain *dom, const struct id_map *map)
 183 {
 184         struct idmap_tdb2_context *ctx;
 185         NTSTATUS ret;
 186         char *kidstr;
 187         struct dom_sid_buf sid_str;
 188         struct idmap_tdb_common_context *commonctx;
 189         struct idmap_tdb2_set_mapping_context state;
 190
 191         if (!map || !map->sid) {
 192                 return NT_STATUS_INVALID_PARAMETER;
 193         }
 194
 195         kidstr = NULL;
 196
 197         /* TODO: should we filter a set_mapping using low/high filters ? */
 198
 199         commonctx = talloc_get_type(dom->private_data,
 200                                     struct idmap_tdb_common_context);
 201
 202         ctx = talloc_get_type(commonctx->private_data,
 203                               struct idmap_tdb2_context);
 204
 205         switch (map->xid.type) {
 206
 207         case ID_TYPE_UID:
 208                 kidstr = talloc_asprintf(ctx, "UID %lu", (unsigned long)map->xid.id);
 209                 break;
 210
 211         case ID_TYPE_GID:
 212                 kidstr = talloc_asprintf(ctx, "GID %lu", (unsigned long)map->xid.id);
 213                 break;
 214
 215         default:
 216                 DEBUG(2, ("INVALID unix ID type: 0x02%x\n", map->xid.type));
 217                 return NT_STATUS_INVALID_PARAMETER;
 218         }
 219
 220         if (kidstr == NULL) {
 221                 DEBUG(0, ("ERROR: Out of memory!\n"));
 222                 ret = NT_STATUS_NO_MEMORY;
 223                 goto done;
 224         }
 225
 226         state.ksidstr = dom_sid_str_buf(map->sid, &sid_str);
 227         state.kidstr = kidstr;
 228
 229         ret = dbwrap_trans_do(commonctx->db, idmap_tdb2_set_mapping_action,
 230                               &state);
 231
 232 done:
 233         talloc_free(kidstr);
 234         return ret;
 235 }
 236
 237 /*
 238   run a script to perform a mapping
 239
 240   The script should the following command lines:
 241
 242       SIDTOID S-1-xxxx
 243       IDTOSID UID xxxx
 244       IDTOSID GID xxxx
 245
 246   and should return one of the following as a single line of text
 247      UID:xxxx
 248      GID:xxxx
 249      SID:xxxx
 250      ERR:xxxx
 251  */
 252 static NTSTATUS idmap_tdb2_script(struct idmap_tdb2_context *ctx,
 253                                   struct id_map *map, const char *fmt, ...)
 254                                   PRINTF_ATTRIBUTE(3,4);
 255
 256 static NTSTATUS idmap_tdb2_script(struct idmap_tdb2_context *ctx, struct id_map *map,
 257                                   const char *fmt, ...)
 258 {
 259         va_list ap;
 260         char *cmd;
 261         FILE *p;
 262         char line[64];
 263         unsigned long v;
 264
 265         cmd = talloc_asprintf(ctx, "%s ", ctx->script);
 266         NT_STATUS_HAVE_NO_MEMORY(cmd);
 267
 268         va_start(ap, fmt);
 269         cmd = talloc_vasprintf_append(cmd, fmt, ap);
 270         va_end(ap);
 271         NT_STATUS_HAVE_NO_MEMORY(cmd);
 272
 273         p = popen(cmd, "r");
 274         talloc_free(cmd);
 275         if (p == NULL) {
 276                 return NT_STATUS_NONE_MAPPED;
 277         }
 278
 279         if (fgets(line, sizeof(line)-1, p) == NULL) {
 280                 pclose(p);
 281                 return NT_STATUS_NONE_MAPPED;
 282         }
 283         pclose(p);
 284
 285         DEBUG(10,("idmap script gave: %s\n", line));
 286
 287         if (sscanf(line, "UID:%lu", &v) == 1) {
 288                 map->xid.id   = v;
 289                 map->xid.type = ID_TYPE_UID;
 290         } else if (sscanf(line, "GID:%lu", &v) == 1) {
 291                 map->xid.id   = v;
 292                 map->xid.type = ID_TYPE_GID;
 293         } else if (strncmp(line, "SID:S-", 6) == 0) {
 294                 if (!string_to_sid(map->sid, &line[4])) {
 295                         DEBUG(0,("Bad SID in '%s' from idmap script %s\n",
 296                                  line, ctx->script));
 297                         return NT_STATUS_NONE_MAPPED;
 298                 }
 299         } else {
 300                 DEBUG(0,("Bad reply '%s' from idmap script %s\n",
 301                          line, ctx->script));
 302                 return NT_STATUS_NONE_MAPPED;
 303         }
 304
 305         return NT_STATUS_OK;
 306 }
 307
 308
 309
 310 /*
 311   Single id to sid lookup function.
 312 */
 313 static NTSTATUS idmap_tdb2_id_to_sid(struct idmap_domain *dom, struct id_map *map)
 314 {
 315         NTSTATUS ret;
 316         TDB_DATA data;
 317         char *keystr;
 318         NTSTATUS status;
 319         struct idmap_tdb_common_context *commonctx;
 320         struct idmap_tdb2_context *ctx;
 321
 322
 323         if (!dom || !map) {
 324                 return NT_STATUS_INVALID_PARAMETER;
 325         }
 326
 327         status = idmap_tdb2_open_db(dom);
 328         NT_STATUS_NOT_OK_RETURN(status);
 329
 330         commonctx = talloc_get_type(dom->private_data,
 331                                     struct idmap_tdb_common_context);
 332
 333         ctx = talloc_get_type(commonctx->private_data,
 334                               struct idmap_tdb2_context);
 335
 336         /* apply filters before checking */
 337         if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
 338                 DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
 339                                 map->xid.id, dom->low_id, dom->high_id));
 340                 return NT_STATUS_NONE_MAPPED;
 341         }
 342
 343         switch (map->xid.type) {
 344
 345         case ID_TYPE_UID:
 346                 keystr = talloc_asprintf(ctx, "UID %lu", (unsigned long)map->xid.id);
 347                 break;
 348
 349         case ID_TYPE_GID:
 350                 keystr = talloc_asprintf(ctx, "GID %lu", (unsigned long)map->xid.id);
 351                 break;
 352
 353         default:
 354                 DEBUG(2, ("INVALID unix ID type: 0x02%x\n", map->xid.type));
 355                 return NT_STATUS_INVALID_PARAMETER;
 356         }
 357
 358         if (keystr == NULL) {
 359                 DEBUG(0, ("Out of memory!\n"));
 360                 ret = NT_STATUS_NO_MEMORY;
 361                 goto done;
 362         }
 363
 364         DEBUG(10,("Fetching record %s\n", keystr));
 365
 366         /* Check if the mapping exists */
 367         status = dbwrap_fetch_bystring(commonctx->db, keystr, keystr, &data);
 368
 369         if (!NT_STATUS_IS_OK(status)) {
 370                 struct dom_sid_buf sidstr;
 371                 struct idmap_tdb2_set_mapping_context store_state;
 372
 373                 DEBUG(10,("Record %s not found\n", keystr));
 374                 if (ctx->script == NULL) {
 375                         ret = NT_STATUS_NONE_MAPPED;
 376                         goto done;
 377                 }
 378
 379                 ret = idmap_tdb2_script(ctx, map, "IDTOSID %s", keystr);
 380                 if (!NT_STATUS_IS_OK(ret)) {
 381                         goto done;
 382                 }
 383
 384                 store_state.ksidstr = dom_sid_str_buf(map->sid, &sidstr);
 385                 store_state.kidstr = keystr;
 386
 387                 ret = dbwrap_trans_do(commonctx->db,
 388                                       idmap_tdb2_set_mapping_action,
 389                                       &store_state);
 390                 goto done;
 391         }
 392
 393         if (!string_to_sid(map->sid, (const char *)data.dptr)) {
 394                 DEBUG(10,("INVALID SID (%s) in record %s\n",
 395                         (const char *)data.dptr, keystr));
 396                 ret = NT_STATUS_INTERNAL_DB_ERROR;
 397                 goto done;
 398         }
 399
 400         DEBUG(10,("Found record %s -> %s\n", keystr, (const char *)data.dptr));
 401         ret = NT_STATUS_OK;
 402
 403 done:
 404         talloc_free(keystr);
 405         return ret;
 406 }
 407
 408
 409 /*
 410  Single sid to id lookup function.
 411 */
 412 static NTSTATUS idmap_tdb2_sid_to_id(struct idmap_domain *dom, struct id_map *map)
 413 {
 414         NTSTATUS ret;
 415         TDB_DATA data;
 416         struct dom_sid_buf keystr;
 417         unsigned long rec_id = 0;
 418         struct idmap_tdb_common_context *commonctx;
 419         struct idmap_tdb2_context *ctx;
 420         TALLOC_CTX *tmp_ctx = talloc_stackframe();
 421
 422         ret = idmap_tdb2_open_db(dom);
 423         NT_STATUS_NOT_OK_RETURN(ret);
 424
 425         commonctx = talloc_get_type(dom->private_data,
 426                                     struct idmap_tdb_common_context);
 427
 428         ctx = talloc_get_type(commonctx->private_data,
 429                               struct idmap_tdb2_context);
 430
 431         dom_sid_str_buf(map->sid, &keystr);
 432
 433         DEBUG(10, ("Fetching record %s\n", keystr.buf));
 434
 435         /* Check if sid is present in database */
 436         ret = dbwrap_fetch_bystring(commonctx->db, tmp_ctx, keystr.buf, &data);
 437         if (!NT_STATUS_IS_OK(ret)) {
 438                 char *idstr;
 439                 struct idmap_tdb2_set_mapping_context store_state;
 440
 441                 DBG_DEBUG("Record %s not found\n", keystr.buf);
 442
 443                 if (ctx->script == NULL) {
 444                         ret = NT_STATUS_NONE_MAPPED;
 445                         goto done;
 446                 }
 447
 448                 ret = idmap_tdb2_script(ctx, map, "SIDTOID %s", keystr.buf);
 449                 if (!NT_STATUS_IS_OK(ret)) {
 450                         goto done;
 451                 }
 452
 453                 /* apply filters before returning result */
 454                 if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
 455                         DEBUG(5, ("Script returned id (%u) out of range "
 456                                   "(%u - %u). Filtered!\n",
 457                                   map->xid.id, dom->low_id, dom->high_id));
 458                         ret = NT_STATUS_NONE_MAPPED;
 459                         goto done;
 460                 }
 461
 462                 idstr = talloc_asprintf(tmp_ctx, "%cID %lu",
 463                                         map->xid.type == ID_TYPE_UID?'U':'G',
 464                                         (unsigned long)map->xid.id);
 465                 if (idstr == NULL) {
 466                         ret = NT_STATUS_NO_MEMORY;
 467                         goto done;
 468                 }
 469
 470                 store_state.ksidstr = keystr.buf;
 471                 store_state.kidstr = idstr;
 472
 473                 ret = dbwrap_trans_do(commonctx->db,
 474                                       idmap_tdb2_set_mapping_action,
 475                                       &store_state);
 476                 goto done;
 477         }
 478
 479         /* What type of record is this ? */
 480         if (sscanf((const char *)data.dptr, "UID %lu", &rec_id) == 1) { /* Try a UID record. */
 481                 map->xid.id = rec_id;
 482                 map->xid.type = ID_TYPE_UID;
 483                 DBG_DEBUG("Found uid record %s -> %s \n",
 484                           keystr.buf,
 485                           (const char *)data.dptr );
 486                 ret = NT_STATUS_OK;
 487
 488         } else if (sscanf((const char *)data.dptr, "GID %lu", &rec_id) == 1) { /* Try a GID record. */
 489                 map->xid.id = rec_id;
 490                 map->xid.type = ID_TYPE_GID;
 491                 DBG_DEBUG("Found gid record %s -> %s \n",
 492                           keystr.buf,
 493                           (const char *)data.dptr );
 494                 ret = NT_STATUS_OK;
 495
 496         } else { /* Unknown record type ! */
 497                 DBG_WARNING("Found INVALID record %s -> %s\n",
 498                             keystr.buf,
 499                             (const char *)data.dptr);
 500                 ret = NT_STATUS_INTERNAL_DB_ERROR;
 501                 goto done;
 502         }
 503
 504         /* apply filters before returning result */
 505         if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
 506                 DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
 507                                 map->xid.id, dom->low_id, dom->high_id));
 508                 ret = NT_STATUS_NONE_MAPPED;
 509         }
 510
 511 done:
 512         talloc_free(tmp_ctx);
 513         return ret;
 514 }
 515
 516 /*
 517   Initialise idmap database.
 518 */
 519 static NTSTATUS idmap_tdb2_db_init(struct idmap_domain *dom)
 520 {
 521         NTSTATUS ret;
 522         struct idmap_tdb_common_context *commonctx;
 523         struct idmap_tdb2_context *ctx;
 524         const char * idmap_script = NULL;
 525         const char *ctx_script = NULL;
 526
 527         commonctx = talloc_zero(dom, struct idmap_tdb_common_context);
 528         if(!commonctx) {
 529                 DEBUG(0, ("Out of memory!\n"));
 530                 return NT_STATUS_NO_MEMORY;
 531         }
 532
 533         commonctx->rw_ops = talloc_zero(commonctx, struct idmap_rw_ops);
 534         if (commonctx->rw_ops == NULL) {
 535                 DEBUG(0, ("Out of memory!\n"));
 536                 ret = NT_STATUS_NO_MEMORY;
 537                 goto failed;
 538         }
 539
 540         ctx = talloc_zero(commonctx, struct idmap_tdb2_context);
 541         if (!ctx) {
 542                 DEBUG(0, ("Out of memory!\n"));
 543                 ret = NT_STATUS_NO_MEMORY;
 544                 goto failed;
 545         }
 546
 547         ctx_script = idmap_config_const_string(dom->name, "script", NULL);
 548
 549         idmap_script = lp_parm_const_string(-1, "idmap", "script", NULL);
 550         if (idmap_script != NULL) {
 551                 DEBUG(0, ("Warning: 'idmap:script' is deprecated. "
 552                           " Please use 'idmap config * : script' instead!\n"));
 553         }
 554
 555         if (strequal(dom->name, "*") && ctx_script == NULL) {
 556                 /* fall back to idmap:script for backwards compatibility */
 557                 ctx_script = idmap_script;
 558         }
 559
 560         if (ctx_script) {
 561                 DEBUG(1, ("using idmap script '%s'\n", ctx_script));
 562                 /*
 563                  * We must ensure this memory is owned by ctx.
 564                  * The ctx_script const pointer is a pointer into
 565                  * the config file data and may become invalid
 566                  * on config file reload. BUG: 13956
 567                  */
 568                 ctx->script = talloc_strdup(ctx, ctx_script);
 569                 if (ctx->script == NULL) {
 570                         ret = NT_STATUS_NO_MEMORY;
 571                         goto failed;
 572                 }
 573         }
 574
 575         commonctx->max_id = dom->high_id;
 576         commonctx->hwmkey_uid = HWM_USER;
 577         commonctx->hwmkey_gid = HWM_GROUP;
 578
 579         commonctx->sid_to_unixid_fn = idmap_tdb2_sid_to_id;
 580         commonctx->unixid_to_sid_fn = idmap_tdb2_id_to_sid;
 581
 582         commonctx->rw_ops->get_new_id = idmap_tdb_common_get_new_id;
 583         commonctx->rw_ops->set_mapping = idmap_tdb2_set_mapping;
 584
 585         commonctx->private_data = ctx;
 586         dom->private_data = commonctx;
 587
 588         ret = idmap_tdb2_open_db(dom);
 589         if (!NT_STATUS_IS_OK(ret)) {
 590                 goto failed;
 591         }
 592
 593         return NT_STATUS_OK;
 594
 595 failed:
 596         talloc_free(commonctx);
 597         return ret;
 598 }
 599
 600
 601 static struct idmap_methods db_methods = {
 602         .init            = idmap_tdb2_db_init,
 603         .unixids_to_sids = idmap_tdb_common_unixids_to_sids,
 604         .sids_to_unixids = idmap_tdb_common_sids_to_unixids,
 605         .allocate_id     = idmap_tdb_common_get_new_id
 606 };
 607
 608 static_decl_idmap;
 609 NTSTATUS idmap_tdb2_init(TALLOC_CTX *ctx)
 610 {
 611         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "tdb2", &db_methods);
 612 }