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 *ksidstr, *kidstr;
 187         struct idmap_tdb_common_context *commonctx;
 188         struct idmap_tdb2_set_mapping_context state;
 189
 190         if (!map || !map->sid) {
 191                 return NT_STATUS_INVALID_PARAMETER;
 192         }
 193
 194         ksidstr = kidstr = NULL;
 195
 196         /* TODO: should we filter a set_mapping using low/high filters ? */
 197
 198         commonctx = talloc_get_type(dom->private_data,
 199                                     struct idmap_tdb_common_context);
 200
 201         ctx = talloc_get_type(commonctx->private_data,
 202                               struct idmap_tdb2_context);
 203
 204         switch (map->xid.type) {
 205
 206         case ID_TYPE_UID:
 207                 kidstr = talloc_asprintf(ctx, "UID %lu", (unsigned long)map->xid.id);
 208                 break;
 209
 210         case ID_TYPE_GID:
 211                 kidstr = talloc_asprintf(ctx, "GID %lu", (unsigned long)map->xid.id);
 212                 break;
 213
 214         default:
 215                 DEBUG(2, ("INVALID unix ID type: 0x02%x\n", map->xid.type));
 216                 return NT_STATUS_INVALID_PARAMETER;
 217         }
 218
 219         if (kidstr == NULL) {
 220                 DEBUG(0, ("ERROR: Out of memory!\n"));
 221                 ret = NT_STATUS_NO_MEMORY;
 222                 goto done;
 223         }
 224
 225         ksidstr = sid_string_talloc(ctx, map->sid);
 226         if (ksidstr == NULL) {
 227                 DEBUG(0, ("Out of memory!\n"));
 228                 ret = NT_STATUS_NO_MEMORY;
 229                 goto done;
 230         }
 231
 232         state.ksidstr = ksidstr;
 233         state.kidstr = kidstr;
 234
 235         ret = dbwrap_trans_do(commonctx->db, idmap_tdb2_set_mapping_action,
 236                               &state);
 237
 238 done:
 239         talloc_free(ksidstr);
 240         talloc_free(kidstr);
 241         return ret;
 242 }
 243
 244 /*
 245   run a script to perform a mapping
 246
 247   The script should the following command lines:
 248
 249       SIDTOID S-1-xxxx
 250       IDTOSID UID xxxx
 251       IDTOSID GID xxxx
 252
 253   and should return one of the following as a single line of text
 254      UID:xxxx
 255      GID:xxxx
 256      SID:xxxx
 257      ERR:xxxx
 258  */
 259 static NTSTATUS idmap_tdb2_script(struct idmap_tdb2_context *ctx,
 260                                   struct id_map *map, const char *fmt, ...)
 261                                   PRINTF_ATTRIBUTE(3,4);
 262
 263 static NTSTATUS idmap_tdb2_script(struct idmap_tdb2_context *ctx, struct id_map *map,
 264                                   const char *fmt, ...)
 265 {
 266         va_list ap;
 267         char *cmd;
 268         FILE *p;
 269         char line[64];
 270         unsigned long v;
 271
 272         cmd = talloc_asprintf(ctx, "%s ", ctx->script);
 273         NT_STATUS_HAVE_NO_MEMORY(cmd);
 274
 275         va_start(ap, fmt);
 276         cmd = talloc_vasprintf_append(cmd, fmt, ap);
 277         va_end(ap);
 278         NT_STATUS_HAVE_NO_MEMORY(cmd);
 279
 280         p = popen(cmd, "r");
 281         talloc_free(cmd);
 282         if (p == NULL) {
 283                 return NT_STATUS_NONE_MAPPED;
 284         }
 285
 286         if (fgets(line, sizeof(line)-1, p) == NULL) {
 287                 pclose(p);
 288                 return NT_STATUS_NONE_MAPPED;
 289         }
 290         pclose(p);
 291
 292         DEBUG(10,("idmap script gave: %s\n", line));
 293
 294         if (sscanf(line, "UID:%lu", &v) == 1) {
 295                 map->xid.id   = v;
 296                 map->xid.type = ID_TYPE_UID;
 297         } else if (sscanf(line, "GID:%lu", &v) == 1) {
 298                 map->xid.id   = v;
 299                 map->xid.type = ID_TYPE_GID;
 300         } else if (strncmp(line, "SID:S-", 6) == 0) {
 301                 if (!string_to_sid(map->sid, &line[4])) {
 302                         DEBUG(0,("Bad SID in '%s' from idmap script %s\n",
 303                                  line, ctx->script));
 304                         return NT_STATUS_NONE_MAPPED;
 305                 }
 306         } else {
 307                 DEBUG(0,("Bad reply '%s' from idmap script %s\n",
 308                          line, ctx->script));
 309                 return NT_STATUS_NONE_MAPPED;
 310         }
 311
 312         return NT_STATUS_OK;
 313 }
 314
 315
 316
 317 /*
 318   Single id to sid lookup function.
 319 */
 320 static NTSTATUS idmap_tdb2_id_to_sid(struct idmap_domain *dom, struct id_map *map)
 321 {
 322         NTSTATUS ret;
 323         TDB_DATA data;
 324         char *keystr;
 325         NTSTATUS status;
 326         struct idmap_tdb_common_context *commonctx;
 327         struct idmap_tdb2_context *ctx;
 328
 329
 330         if (!dom || !map) {
 331                 return NT_STATUS_INVALID_PARAMETER;
 332         }
 333
 334         status = idmap_tdb2_open_db(dom);
 335         NT_STATUS_NOT_OK_RETURN(status);
 336
 337         commonctx = talloc_get_type(dom->private_data,
 338                                     struct idmap_tdb_common_context);
 339
 340         ctx = talloc_get_type(commonctx->private_data,
 341                               struct idmap_tdb2_context);
 342
 343         /* apply filters before checking */
 344         if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
 345                 DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
 346                                 map->xid.id, dom->low_id, dom->high_id));
 347                 return NT_STATUS_NONE_MAPPED;
 348         }
 349
 350         switch (map->xid.type) {
 351
 352         case ID_TYPE_UID:
 353                 keystr = talloc_asprintf(ctx, "UID %lu", (unsigned long)map->xid.id);
 354                 break;
 355
 356         case ID_TYPE_GID:
 357                 keystr = talloc_asprintf(ctx, "GID %lu", (unsigned long)map->xid.id);
 358                 break;
 359
 360         default:
 361                 DEBUG(2, ("INVALID unix ID type: 0x02%x\n", map->xid.type));
 362                 return NT_STATUS_INVALID_PARAMETER;
 363         }
 364
 365         if (keystr == NULL) {
 366                 DEBUG(0, ("Out of memory!\n"));
 367                 ret = NT_STATUS_NO_MEMORY;
 368                 goto done;
 369         }
 370
 371         DEBUG(10,("Fetching record %s\n", keystr));
 372
 373         /* Check if the mapping exists */
 374         status = dbwrap_fetch_bystring(commonctx->db, keystr, keystr, &data);
 375
 376         if (!NT_STATUS_IS_OK(status)) {
 377                 char *sidstr;
 378                 struct idmap_tdb2_set_mapping_context store_state;
 379
 380                 DEBUG(10,("Record %s not found\n", keystr));
 381                 if (ctx->script == NULL) {
 382                         ret = NT_STATUS_NONE_MAPPED;
 383                         goto done;
 384                 }
 385
 386                 ret = idmap_tdb2_script(ctx, map, "IDTOSID %s", keystr);
 387                 if (!NT_STATUS_IS_OK(ret)) {
 388                         goto done;
 389                 }
 390
 391                 sidstr = sid_string_talloc(keystr, map->sid);
 392                 if (!sidstr) {
 393                         ret = NT_STATUS_NO_MEMORY;
 394                         goto done;
 395                 }
 396
 397                 store_state.ksidstr = sidstr;
 398                 store_state.kidstr = keystr;
 399
 400                 ret = dbwrap_trans_do(commonctx->db,
 401                                       idmap_tdb2_set_mapping_action,
 402                                       &store_state);
 403                 goto done;
 404         }
 405
 406         if (!string_to_sid(map->sid, (const char *)data.dptr)) {
 407                 DEBUG(10,("INVALID SID (%s) in record %s\n",
 408                         (const char *)data.dptr, keystr));
 409                 ret = NT_STATUS_INTERNAL_DB_ERROR;
 410                 goto done;
 411         }
 412
 413         DEBUG(10,("Found record %s -> %s\n", keystr, (const char *)data.dptr));
 414         ret = NT_STATUS_OK;
 415
 416 done:
 417         talloc_free(keystr);
 418         return ret;
 419 }
 420
 421
 422 /*
 423  Single sid to id lookup function.
 424 */
 425 static NTSTATUS idmap_tdb2_sid_to_id(struct idmap_domain *dom, struct id_map *map)
 426 {
 427         NTSTATUS ret;
 428         TDB_DATA data;
 429         char *keystr;
 430         unsigned long rec_id = 0;
 431         struct idmap_tdb_common_context *commonctx;
 432         struct idmap_tdb2_context *ctx;
 433         TALLOC_CTX *tmp_ctx = talloc_stackframe();
 434
 435         ret = idmap_tdb2_open_db(dom);
 436         NT_STATUS_NOT_OK_RETURN(ret);
 437
 438         commonctx = talloc_get_type(dom->private_data,
 439                                     struct idmap_tdb_common_context);
 440
 441         ctx = talloc_get_type(commonctx->private_data,
 442                               struct idmap_tdb2_context);
 443
 444         keystr = sid_string_talloc(tmp_ctx, map->sid);
 445         if (keystr == NULL) {
 446                 DEBUG(0, ("Out of memory!\n"));
 447                 ret = NT_STATUS_NO_MEMORY;
 448                 goto done;
 449         }
 450
 451         DEBUG(10,("Fetching record %s\n", keystr));
 452
 453         /* Check if sid is present in database */
 454         ret = dbwrap_fetch_bystring(commonctx->db, tmp_ctx, keystr, &data);
 455         if (!NT_STATUS_IS_OK(ret)) {
 456                 char *idstr;
 457                 struct idmap_tdb2_set_mapping_context store_state;
 458
 459                 DEBUG(10,(__location__ " Record %s not found\n", keystr));
 460
 461                 if (ctx->script == NULL) {
 462                         ret = NT_STATUS_NONE_MAPPED;
 463                         goto done;
 464                 }
 465
 466                 ret = idmap_tdb2_script(ctx, map, "SIDTOID %s", keystr);
 467                 if (!NT_STATUS_IS_OK(ret)) {
 468                         goto done;
 469                 }
 470
 471                 /* apply filters before returning result */
 472                 if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
 473                         DEBUG(5, ("Script returned id (%u) out of range "
 474                                   "(%u - %u). Filtered!\n",
 475                                   map->xid.id, dom->low_id, dom->high_id));
 476                         ret = NT_STATUS_NONE_MAPPED;
 477                         goto done;
 478                 }
 479
 480                 idstr = talloc_asprintf(tmp_ctx, "%cID %lu",
 481                                         map->xid.type == ID_TYPE_UID?'U':'G',
 482                                         (unsigned long)map->xid.id);
 483                 if (idstr == NULL) {
 484                         ret = NT_STATUS_NO_MEMORY;
 485                         goto done;
 486                 }
 487
 488                 store_state.ksidstr = keystr;
 489                 store_state.kidstr = idstr;
 490
 491                 ret = dbwrap_trans_do(commonctx->db,
 492                                       idmap_tdb2_set_mapping_action,
 493                                       &store_state);
 494                 goto done;
 495         }
 496
 497         /* What type of record is this ? */
 498         if (sscanf((const char *)data.dptr, "UID %lu", &rec_id) == 1) { /* Try a UID record. */
 499                 map->xid.id = rec_id;
 500                 map->xid.type = ID_TYPE_UID;
 501                 DEBUG(10,("Found uid record %s -> %s \n", keystr, (const char *)data.dptr ));
 502                 ret = NT_STATUS_OK;
 503
 504         } else if (sscanf((const char *)data.dptr, "GID %lu", &rec_id) == 1) { /* Try a GID record. */
 505                 map->xid.id = rec_id;
 506                 map->xid.type = ID_TYPE_GID;
 507                 DEBUG(10,("Found gid record %s -> %s \n", keystr, (const char *)data.dptr ));
 508                 ret = NT_STATUS_OK;
 509
 510         } else { /* Unknown record type ! */
 511                 DEBUG(2, ("Found INVALID record %s -> %s\n", keystr, (const char *)data.dptr));
 512                 ret = NT_STATUS_INTERNAL_DB_ERROR;
 513                 goto done;
 514         }
 515
 516         /* apply filters before returning result */
 517         if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
 518                 DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
 519                                 map->xid.id, dom->low_id, dom->high_id));
 520                 ret = NT_STATUS_NONE_MAPPED;
 521         }
 522
 523 done:
 524         talloc_free(tmp_ctx);
 525         return ret;
 526 }
 527
 528 /*
 529   Initialise idmap database.
 530 */
 531 static NTSTATUS idmap_tdb2_db_init(struct idmap_domain *dom)
 532 {
 533         NTSTATUS ret;
 534         struct idmap_tdb_common_context *commonctx;
 535         struct idmap_tdb2_context *ctx;
 536         const char * idmap_script = NULL;
 537         const char *ctx_script = NULL;
 538
 539         commonctx = talloc_zero(dom, struct idmap_tdb_common_context);
 540         if(!commonctx) {
 541                 DEBUG(0, ("Out of memory!\n"));
 542                 return NT_STATUS_NO_MEMORY;
 543         }
 544
 545         commonctx->rw_ops = talloc_zero(commonctx, struct idmap_rw_ops);
 546         if (commonctx->rw_ops == NULL) {
 547                 DEBUG(0, ("Out of memory!\n"));
 548                 ret = NT_STATUS_NO_MEMORY;
 549                 goto failed;
 550         }
 551
 552         ctx = talloc_zero(commonctx, struct idmap_tdb2_context);
 553         if (!ctx) {
 554                 DEBUG(0, ("Out of memory!\n"));
 555                 ret = NT_STATUS_NO_MEMORY;
 556                 goto failed;
 557         }
 558
 559         ctx_script = idmap_config_const_string(dom->name, "script", NULL);
 560
 561         idmap_script = lp_parm_const_string(-1, "idmap", "script", NULL);
 562         if (idmap_script != NULL) {
 563                 DEBUG(0, ("Warning: 'idmap:script' is deprecated. "
 564                           " Please use 'idmap config * : script' instead!\n"));
 565         }
 566
 567         if (strequal(dom->name, "*") && ctx_script == NULL) {
 568                 /* fall back to idmap:script for backwards compatibility */
 569                 ctx_script = idmap_script;
 570         }
 571
 572         if (ctx_script) {
 573                 DEBUG(1, ("using idmap script '%s'\n", ctx_script));
 574                 /*
 575                  * We must ensure this memory is owned by ctx.
 576                  * The ctx_script const pointer is a pointer into
 577                  * the config file data and may become invalid
 578                  * on config file reload. BUG: 13956
 579                  */
 580                 ctx->script = talloc_strdup(ctx, ctx_script);
 581                 if (ctx->script == NULL) {
 582                         ret = NT_STATUS_NO_MEMORY;
 583                         goto failed;
 584                 }
 585         }
 586
 587         commonctx->max_id = dom->high_id;
 588         commonctx->hwmkey_uid = HWM_USER;
 589         commonctx->hwmkey_gid = HWM_GROUP;
 590
 591         commonctx->sid_to_unixid_fn = idmap_tdb2_sid_to_id;
 592         commonctx->unixid_to_sid_fn = idmap_tdb2_id_to_sid;
 593
 594         commonctx->rw_ops->get_new_id = idmap_tdb_common_get_new_id;
 595         commonctx->rw_ops->set_mapping = idmap_tdb2_set_mapping;
 596
 597         commonctx->private_data = ctx;
 598         dom->private_data = commonctx;
 599
 600         ret = idmap_tdb2_open_db(dom);
 601         if (!NT_STATUS_IS_OK(ret)) {
 602                 goto failed;
 603         }
 604
 605         return NT_STATUS_OK;
 606
 607 failed:
 608         talloc_free(commonctx);
 609         return ret;
 610 }
 611
 612
 613 static struct idmap_methods db_methods = {
 614         .init            = idmap_tdb2_db_init,
 615         .unixids_to_sids = idmap_tdb_common_unixids_to_sids,
 616         .sids_to_unixids = idmap_tdb_common_sids_to_unixids,
 617         .allocate_id     = idmap_tdb_common_get_new_id
 618 };
 619
 620 static_decl_idmap;
 621 NTSTATUS idmap_tdb2_init(TALLOC_CTX *ctx)
 622 {
 623         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "tdb2", &db_methods);
 624 }