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 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         TALLOC_FREE(db_path);
 119
 120         if (ctx->db == NULL) {
 121                 DEBUG(0, ("Unable to open idmap_tdb2 database '%s'\n",
 122                           db_path));
 123                 return NT_STATUS_UNSUCCESSFUL;
 124         }
 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, struct id_map *map,
 260                                   const char *fmt, ...)
 261 {
 262         va_list ap;
 263         char *cmd;
 264         FILE *p;
 265         char line[64];
 266         unsigned long v;
 267
 268         cmd = talloc_asprintf(ctx, "%s ", ctx->script);
 269         NT_STATUS_HAVE_NO_MEMORY(cmd);
 270
 271         va_start(ap, fmt);
 272         cmd = talloc_vasprintf_append(cmd, fmt, ap);
 273         va_end(ap);
 274         NT_STATUS_HAVE_NO_MEMORY(cmd);
 275
 276         p = popen(cmd, "r");
 277         talloc_free(cmd);
 278         if (p == NULL) {
 279                 return NT_STATUS_NONE_MAPPED;
 280         }
 281
 282         if (fgets(line, sizeof(line)-1, p) == NULL) {
 283                 pclose(p);
 284                 return NT_STATUS_NONE_MAPPED;
 285         }
 286         pclose(p);
 287
 288         DEBUG(10,("idmap script gave: %s\n", line));
 289
 290         if (sscanf(line, "UID:%lu", &v) == 1) {
 291                 map->xid.id   = v;
 292                 map->xid.type = ID_TYPE_UID;
 293         } else if (sscanf(line, "GID:%lu", &v) == 1) {
 294                 map->xid.id   = v;
 295                 map->xid.type = ID_TYPE_GID;
 296         } else if (strncmp(line, "SID:S-", 6) == 0) {
 297                 if (!string_to_sid(map->sid, &line[4])) {
 298                         DEBUG(0,("Bad SID in '%s' from idmap script %s\n",
 299                                  line, ctx->script));
 300                         return NT_STATUS_NONE_MAPPED;
 301                 }
 302         } else {
 303                 DEBUG(0,("Bad reply '%s' from idmap script %s\n",
 304                          line, ctx->script));
 305                 return NT_STATUS_NONE_MAPPED;
 306         }
 307
 308         return NT_STATUS_OK;
 309 }
 310
 311
 312
 313 /*
 314   Single id to sid lookup function.
 315 */
 316 static NTSTATUS idmap_tdb2_id_to_sid(struct idmap_domain *dom, struct id_map *map)
 317 {
 318         NTSTATUS ret;
 319         TDB_DATA data;
 320         char *keystr;
 321         NTSTATUS status;
 322         struct idmap_tdb_common_context *commonctx;
 323         struct idmap_tdb2_context *ctx;
 324
 325
 326         if (!dom || !map) {
 327                 return NT_STATUS_INVALID_PARAMETER;
 328         }
 329
 330         status = idmap_tdb2_open_db(dom);
 331         NT_STATUS_NOT_OK_RETURN(status);
 332
 333         commonctx = talloc_get_type(dom->private_data,
 334                                     struct idmap_tdb_common_context);
 335
 336         ctx = talloc_get_type(commonctx->private_data,
 337                               struct idmap_tdb2_context);
 338
 339         /* apply filters before checking */
 340         if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
 341                 DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
 342                                 map->xid.id, dom->low_id, dom->high_id));
 343                 return NT_STATUS_NONE_MAPPED;
 344         }
 345
 346         switch (map->xid.type) {
 347
 348         case ID_TYPE_UID:
 349                 keystr = talloc_asprintf(ctx, "UID %lu", (unsigned long)map->xid.id);
 350                 break;
 351
 352         case ID_TYPE_GID:
 353                 keystr = talloc_asprintf(ctx, "GID %lu", (unsigned long)map->xid.id);
 354                 break;
 355
 356         default:
 357                 DEBUG(2, ("INVALID unix ID type: 0x02%x\n", map->xid.type));
 358                 return NT_STATUS_INVALID_PARAMETER;
 359         }
 360
 361         if (keystr == NULL) {
 362                 DEBUG(0, ("Out of memory!\n"));
 363                 ret = NT_STATUS_NO_MEMORY;
 364                 goto done;
 365         }
 366
 367         DEBUG(10,("Fetching record %s\n", keystr));
 368
 369         /* Check if the mapping exists */
 370         status = dbwrap_fetch_bystring(commonctx->db, keystr, keystr, &data);
 371
 372         if (!NT_STATUS_IS_OK(status)) {
 373                 char *sidstr;
 374                 struct idmap_tdb2_set_mapping_context store_state;
 375
 376                 DEBUG(10,("Record %s not found\n", keystr));
 377                 if (ctx->script == NULL) {
 378                         ret = NT_STATUS_NONE_MAPPED;
 379                         goto done;
 380                 }
 381
 382                 ret = idmap_tdb2_script(ctx, map, "IDTOSID %s", keystr);
 383                 if (!NT_STATUS_IS_OK(ret)) {
 384                         goto done;
 385                 }
 386
 387                 sidstr = sid_string_talloc(keystr, map->sid);
 388                 if (!sidstr) {
 389                         ret = NT_STATUS_NO_MEMORY;
 390                         goto done;
 391                 }
 392
 393                 store_state.ksidstr = sidstr;
 394                 store_state.kidstr = keystr;
 395
 396                 ret = dbwrap_trans_do(commonctx->db,
 397                                       idmap_tdb2_set_mapping_action,
 398                                       &store_state);
 399                 goto done;
 400         }
 401
 402         if (!string_to_sid(map->sid, (const char *)data.dptr)) {
 403                 DEBUG(10,("INVALID SID (%s) in record %s\n",
 404                         (const char *)data.dptr, keystr));
 405                 ret = NT_STATUS_INTERNAL_DB_ERROR;
 406                 goto done;
 407         }
 408
 409         DEBUG(10,("Found record %s -> %s\n", keystr, (const char *)data.dptr));
 410         ret = NT_STATUS_OK;
 411
 412 done:
 413         talloc_free(keystr);
 414         return ret;
 415 }
 416
 417
 418 /*
 419  Single sid to id lookup function.
 420 */
 421 static NTSTATUS idmap_tdb2_sid_to_id(struct idmap_domain *dom, struct id_map *map)
 422 {
 423         NTSTATUS ret;
 424         TDB_DATA data;
 425         char *keystr;
 426         unsigned long rec_id = 0;
 427         struct idmap_tdb_common_context *commonctx;
 428         struct idmap_tdb2_context *ctx;
 429         TALLOC_CTX *tmp_ctx = talloc_stackframe();
 430
 431         ret = idmap_tdb2_open_db(dom);
 432         NT_STATUS_NOT_OK_RETURN(ret);
 433
 434         commonctx = talloc_get_type(dom->private_data,
 435                                     struct idmap_tdb_common_context);
 436
 437         ctx = talloc_get_type(commonctx->private_data,
 438                               struct idmap_tdb2_context);
 439
 440         keystr = sid_string_talloc(tmp_ctx, map->sid);
 441         if (keystr == NULL) {
 442                 DEBUG(0, ("Out of memory!\n"));
 443                 ret = NT_STATUS_NO_MEMORY;
 444                 goto done;
 445         }
 446
 447         DEBUG(10,("Fetching record %s\n", keystr));
 448
 449         /* Check if sid is present in database */
 450         ret = dbwrap_fetch_bystring(commonctx->db, tmp_ctx, keystr, &data);
 451         if (!NT_STATUS_IS_OK(ret)) {
 452                 char *idstr;
 453                 struct idmap_tdb2_set_mapping_context store_state;
 454
 455                 DEBUG(10,(__location__ " Record %s not found\n", keystr));
 456
 457                 if (ctx->script == NULL) {
 458                         ret = NT_STATUS_NONE_MAPPED;
 459                         goto done;
 460                 }
 461
 462                 ret = idmap_tdb2_script(ctx, map, "SIDTOID %s", keystr);
 463                 if (!NT_STATUS_IS_OK(ret)) {
 464                         goto done;
 465                 }
 466
 467                 /* apply filters before returning result */
 468                 if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
 469                         DEBUG(5, ("Script returned id (%u) out of range "
 470                                   "(%u - %u). Filtered!\n",
 471                                   map->xid.id, dom->low_id, dom->high_id));
 472                         ret = NT_STATUS_NONE_MAPPED;
 473                         goto done;
 474                 }
 475
 476                 idstr = talloc_asprintf(tmp_ctx, "%cID %lu",
 477                                         map->xid.type == ID_TYPE_UID?'U':'G',
 478                                         (unsigned long)map->xid.id);
 479                 if (idstr == NULL) {
 480                         ret = NT_STATUS_NO_MEMORY;
 481                         goto done;
 482                 }
 483
 484                 store_state.ksidstr = keystr;
 485                 store_state.kidstr = idstr;
 486
 487                 ret = dbwrap_trans_do(commonctx->db,
 488                                       idmap_tdb2_set_mapping_action,
 489                                       &store_state);
 490                 goto done;
 491         }
 492
 493         /* What type of record is this ? */
 494         if (sscanf((const char *)data.dptr, "UID %lu", &rec_id) == 1) { /* Try a UID record. */
 495                 map->xid.id = rec_id;
 496                 map->xid.type = ID_TYPE_UID;
 497                 DEBUG(10,("Found uid record %s -> %s \n", keystr, (const char *)data.dptr ));
 498                 ret = NT_STATUS_OK;
 499
 500         } else if (sscanf((const char *)data.dptr, "GID %lu", &rec_id) == 1) { /* Try a GID record. */
 501                 map->xid.id = rec_id;
 502                 map->xid.type = ID_TYPE_GID;
 503                 DEBUG(10,("Found gid record %s -> %s \n", keystr, (const char *)data.dptr ));
 504                 ret = NT_STATUS_OK;
 505
 506         } else { /* Unknown record type ! */
 507                 DEBUG(2, ("Found INVALID record %s -> %s\n", keystr, (const char *)data.dptr));
 508                 ret = NT_STATUS_INTERNAL_DB_ERROR;
 509                 goto done;
 510         }
 511
 512         /* apply filters before returning result */
 513         if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
 514                 DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
 515                                 map->xid.id, dom->low_id, dom->high_id));
 516                 ret = NT_STATUS_NONE_MAPPED;
 517         }
 518
 519 done:
 520         talloc_free(tmp_ctx);
 521         return ret;
 522 }
 523
 524 /*
 525   Initialise idmap database.
 526 */
 527 static NTSTATUS idmap_tdb2_db_init(struct idmap_domain *dom)
 528 {
 529         NTSTATUS ret;
 530         struct idmap_tdb_common_context *commonctx;
 531         struct idmap_tdb2_context *ctx;
 532         char *config_option = NULL;
 533         const char * idmap_script = NULL;
 534
 535         commonctx = talloc_zero(dom, struct idmap_tdb_common_context);
 536         if(!commonctx) {
 537                 DEBUG(0, ("Out of memory!\n"));
 538                 return NT_STATUS_NO_MEMORY;
 539         }
 540
 541         commonctx->rw_ops = talloc_zero(commonctx, struct idmap_rw_ops);
 542         if (commonctx->rw_ops == NULL) {
 543                 DEBUG(0, ("Out of memory!\n"));
 544                 ret = NT_STATUS_NO_MEMORY;
 545                 goto failed;
 546         }
 547
 548         ctx = talloc_zero(commonctx, struct idmap_tdb2_context);
 549         if (!ctx) {
 550                 DEBUG(0, ("Out of memory!\n"));
 551                 ret = NT_STATUS_NO_MEMORY;
 552                 goto failed;
 553         }
 554
 555         config_option = talloc_asprintf(ctx, "idmap config %s", dom->name);
 556         if (config_option == NULL) {
 557                 DEBUG(0, ("Out of memory!\n"));
 558                 ret = NT_STATUS_NO_MEMORY;
 559                 goto failed;
 560         }
 561         ctx->script = lp_parm_const_string(-1, config_option, "script", NULL);
 562         talloc_free(config_option);
 563
 564         idmap_script = lp_parm_const_string(-1, "idmap", "script", NULL);
 565         if (idmap_script != NULL) {
 566                 DEBUG(0, ("Warning: 'idmap:script' is deprecated. "
 567                           " Please use 'idmap config * : script' instead!\n"));
 568         }
 569
 570         if (strequal(dom->name, "*") && ctx->script == NULL) {
 571                 /* fall back to idmap:script for backwards compatibility */
 572                 ctx->script = idmap_script;
 573         }
 574
 575         if (ctx->script) {
 576                 DEBUG(1, ("using idmap script '%s'\n", ctx->script));
 577         }
 578
 579         commonctx->max_id = dom->high_id;
 580         commonctx->hwmkey_uid = HWM_USER;
 581         commonctx->hwmkey_gid = HWM_GROUP;
 582
 583         commonctx->sid_to_unixid_fn = idmap_tdb2_sid_to_id;
 584         commonctx->unixid_to_sid_fn = idmap_tdb2_id_to_sid;
 585
 586         commonctx->rw_ops->get_new_id = idmap_tdb_common_get_new_id;
 587         commonctx->rw_ops->set_mapping = idmap_tdb2_set_mapping;
 588
 589         commonctx->private_data = ctx;
 590         dom->private_data = commonctx;
 591
 592         ret = idmap_tdb2_open_db(dom);
 593         if (!NT_STATUS_IS_OK(ret)) {
 594                 goto failed;
 595         }
 596
 597         return NT_STATUS_OK;
 598
 599 failed:
 600         talloc_free(commonctx);
 601         return ret;
 602 }
 603
 604
 605 static struct idmap_methods db_methods = {
 606         .init            = idmap_tdb2_db_init,
 607         .unixids_to_sids = idmap_tdb_common_unixids_to_sids,
 608         .sids_to_unixids = idmap_tdb_common_sids_to_unixids,
 609         .allocate_id     = idmap_tdb_common_get_new_id
 610 };
 611
 612 NTSTATUS idmap_tdb2_init(void)
 613 {
 614         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "tdb2", &db_methods);
 615 }