source3/winbindd/idmap_tdb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    idmap TDB backend
   5
   6    Copyright (C) Tim Potter 2000
   7    Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
   8    Copyright (C) Jeremy Allison 2006
   9    Copyright (C) Simo Sorce 2003-2006
  10    Copyright (C) Michael Adam 2009-2010
  11
  12    This program is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 3 of the License, or
  15    (at your option) any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  24 */
  25
  26 #include "includes.h"
  27 #include "system/filesys.h"
  28 #include "winbindd.h"
  29 #include "idmap.h"
  30 #include "idmap_rw.h"
  31 #include "idmap_tdb_common.h"
  32 #include "dbwrap/dbwrap.h"
  33 #include "dbwrap/dbwrap_open.h"
  34 #include "../libcli/security/security.h"
  35 #include "util_tdb.h"
  36
  37 #undef DBGC_CLASS
  38 #define DBGC_CLASS DBGC_IDMAP
  39
  40 /* idmap version determines auto-conversion - this is the database
  41    structure version specifier. */
  42
  43 #define IDMAP_VERSION 2
  44
  45 /* High water mark keys */
  46 #define HWM_GROUP  "GROUP HWM"
  47 #define HWM_USER   "USER HWM"
  48
  49 struct convert_fn_state {
  50         struct db_context *db;
  51         bool failed;
  52 };
  53
  54 /*****************************************************************************
  55  For idmap conversion: convert one record to new format
  56  Ancient versions (eg 2.2.3a) of winbindd_idmap.tdb mapped DOMAINNAME/rid
  57  instead of the SID.
  58 *****************************************************************************/
  59 static int convert_fn(struct db_record *rec, void *private_data)
  60 {
  61         struct winbindd_domain *domain;
  62         char *p;
  63         NTSTATUS status;
  64         struct dom_sid sid;
  65         uint32_t rid;
  66         struct dom_sid_buf keystr;
  67         fstring dom_name;
  68         TDB_DATA key;
  69         TDB_DATA key2;
  70         TDB_DATA value;
  71         struct convert_fn_state *s = (struct convert_fn_state *)private_data;
  72
  73         key = dbwrap_record_get_key(rec);
  74
  75         DEBUG(10,("Converting %s\n", (const char *)key.dptr));
  76
  77         p = strchr((const char *)key.dptr, '/');
  78         if (!p)
  79                 return 0;
  80
  81         *p = 0;
  82         fstrcpy(dom_name, (const char *)key.dptr);
  83         *p++ = '/';
  84
  85         domain = find_domain_from_name(dom_name);
  86         if (domain == NULL) {
  87                 /* We must delete the old record. */
  88                 DEBUG(0,("Unable to find domain %s\n", dom_name ));
  89                 DEBUG(0,("deleting record %s\n", (const char *)key.dptr ));
  90
  91                 status = dbwrap_record_delete(rec);
  92                 if (!NT_STATUS_IS_OK(status)) {
  93                         DEBUG(0, ("Unable to delete record %s:%s\n",
  94                                 (const char *)key.dptr,
  95                                 nt_errstr(status)));
  96                         s->failed = true;
  97                         return -1;
  98                 }
  99
 100                 return 0;
 101         }
 102
 103         rid = atoi(p);
 104
 105         sid_compose(&sid, &domain->sid, rid);
 106
 107         key2 = string_term_tdb_data(dom_sid_str_buf(&sid, &keystr));
 108
 109         value = dbwrap_record_get_value(rec);
 110
 111         status = dbwrap_store(s->db, key2, value, TDB_INSERT);
 112         if (!NT_STATUS_IS_OK(status)) {
 113                 DEBUG(0,("Unable to add record %s:%s\n",
 114                         (const char *)key2.dptr,
 115                         nt_errstr(status)));
 116                 s->failed = true;
 117                 return -1;
 118         }
 119
 120         status = dbwrap_store(s->db, value, key2, TDB_REPLACE);
 121         if (!NT_STATUS_IS_OK(status)) {
 122                 DEBUG(0,("Unable to update record %s:%s\n",
 123                         (const char *)value.dptr,
 124                         nt_errstr(status)));
 125                 s->failed = true;
 126                 return -1;
 127         }
 128
 129         status = dbwrap_record_delete(rec);
 130         if (!NT_STATUS_IS_OK(status)) {
 131                 DEBUG(0,("Unable to delete record %s:%s\n",
 132                         (const char *)key.dptr,
 133                         nt_errstr(status)));
 134                 s->failed = true;
 135                 return -1;
 136         }
 137
 138         return 0;
 139 }
 140
 141 /*****************************************************************************
 142  Convert the idmap database from an older version.
 143 *****************************************************************************/
 144
 145 static bool idmap_tdb_upgrade(struct idmap_domain *dom, struct db_context *db)
 146 {
 147         int32_t vers;
 148         struct convert_fn_state s;
 149         NTSTATUS status;
 150
 151         status = dbwrap_fetch_int32_bystring(db, "IDMAP_VERSION", &vers);
 152         if (!NT_STATUS_IS_OK(status)) {
 153                 vers = -1;
 154         }
 155
 156         if (IREV(vers) == IDMAP_VERSION) {
 157                 /* Arrggghh ! Bytereversed - make order independent ! */
 158                 /*
 159                  * high and low records were created on a
 160                  * big endian machine and will need byte-reversing.
 161                  */
 162
 163                 int32_t wm;
 164
 165                 status = dbwrap_fetch_int32_bystring(db, HWM_USER, &wm);
 166                 if (!NT_STATUS_IS_OK(status)) {
 167                         wm = -1;
 168                 }
 169
 170                 if (wm != -1) {
 171                         wm = IREV(wm);
 172                 }  else {
 173                         wm = dom->low_id;
 174                 }
 175
 176                 status = dbwrap_store_int32_bystring(db, HWM_USER, wm);
 177                 if (!NT_STATUS_IS_OK(status)) {
 178                         DEBUG(0, ("Unable to byteswap user hwm in idmap "
 179                                   "database: %s\n", nt_errstr(status)));
 180                         return False;
 181                 }
 182
 183                 status = dbwrap_fetch_int32_bystring(db, HWM_GROUP, &wm);
 184                 if (!NT_STATUS_IS_OK(status)) {
 185                         wm = -1;
 186                 }
 187
 188                 if (wm != -1) {
 189                         wm = IREV(wm);
 190                 } else {
 191                         wm = dom->low_id;
 192                 }
 193
 194                 status = dbwrap_store_int32_bystring(db, HWM_GROUP, wm);
 195                 if (!NT_STATUS_IS_OK(status)) {
 196                         DEBUG(0, ("Unable to byteswap group hwm in idmap "
 197                                   "database: %s\n", nt_errstr(status)));
 198                         return False;
 199                 }
 200         }
 201
 202         s.db = db;
 203         s.failed = false;
 204
 205         /* the old format stored as DOMAIN/rid - now we store the SID direct */
 206         status = dbwrap_traverse(db, convert_fn, &s, NULL);
 207
 208         if (!NT_STATUS_IS_OK(status)) {
 209                 DEBUG(0, ("Database traverse failed during conversion\n"));
 210                 return false;
 211         }
 212
 213         if (s.failed) {
 214                 DEBUG(0, ("Problem during conversion\n"));
 215                 return False;
 216         }
 217
 218         status = dbwrap_store_int32_bystring(db, "IDMAP_VERSION",
 219                                              IDMAP_VERSION);
 220         if (!NT_STATUS_IS_OK(status)) {
 221                 DEBUG(0, ("Unable to store idmap version in database: %s\n",
 222                           nt_errstr(status)));
 223                 return False;
 224         }
 225
 226         return True;
 227 }
 228
 229 static NTSTATUS idmap_tdb_init_hwm(struct idmap_domain *dom)
 230 {
 231         uint32_t low_uid;
 232         uint32_t low_gid;
 233         bool update_uid = false;
 234         bool update_gid = false;
 235         struct idmap_tdb_common_context *ctx;
 236         NTSTATUS status;
 237
 238         ctx = talloc_get_type(dom->private_data,
 239                               struct idmap_tdb_common_context);
 240
 241         status = dbwrap_fetch_uint32_bystring(ctx->db, HWM_USER, &low_uid);
 242         if (!NT_STATUS_IS_OK(status) || low_uid < dom->low_id) {
 243                 update_uid = true;
 244         }
 245
 246         status = dbwrap_fetch_uint32_bystring(ctx->db, HWM_GROUP, &low_gid);
 247         if (!NT_STATUS_IS_OK(status) || low_gid < dom->low_id) {
 248                 update_gid = true;
 249         }
 250
 251         if (!update_uid && !update_gid) {
 252                 return NT_STATUS_OK;
 253         }
 254
 255         if (dbwrap_transaction_start(ctx->db) != 0) {
 256                 DEBUG(0, ("Unable to start upgrade transaction!\n"));
 257                 return NT_STATUS_INTERNAL_DB_ERROR;
 258         }
 259
 260         if (update_uid) {
 261                 status = dbwrap_store_uint32_bystring(ctx->db, HWM_USER,
 262                                                       dom->low_id);
 263                 if (!NT_STATUS_IS_OK(status)) {
 264                         dbwrap_transaction_cancel(ctx->db);
 265                         DEBUG(0, ("Unable to initialise user hwm in idmap "
 266                                   "database: %s\n", nt_errstr(status)));
 267                         return NT_STATUS_INTERNAL_DB_ERROR;
 268                 }
 269         }
 270
 271         if (update_gid) {
 272                 status = dbwrap_store_uint32_bystring(ctx->db, HWM_GROUP,
 273                                                       dom->low_id);
 274                 if (!NT_STATUS_IS_OK(status)) {
 275                         dbwrap_transaction_cancel(ctx->db);
 276                         DEBUG(0, ("Unable to initialise group hwm in idmap "
 277                                   "database: %s\n", nt_errstr(status)));
 278                         return NT_STATUS_INTERNAL_DB_ERROR;
 279                 }
 280         }
 281
 282         if (dbwrap_transaction_commit(ctx->db) != 0) {
 283                 DEBUG(0, ("Unable to commit upgrade transaction!\n"));
 284                 return NT_STATUS_INTERNAL_DB_ERROR;
 285         }
 286
 287         return NT_STATUS_OK;
 288 }
 289
 290 static NTSTATUS idmap_tdb_open_db(struct idmap_domain *dom)
 291 {
 292         NTSTATUS ret;
 293         TALLOC_CTX *mem_ctx;
 294         char *tdbfile = NULL;
 295         struct db_context *db = NULL;
 296         int32_t version;
 297         bool config_error = false;
 298         struct idmap_tdb_common_context *ctx;
 299
 300         ctx = talloc_get_type(dom->private_data,
 301                               struct idmap_tdb_common_context);
 302
 303         if (ctx->db) {
 304                 /* it is already open */
 305                 return NT_STATUS_OK;
 306         }
 307
 308         /* use our own context here */
 309         mem_ctx = talloc_stackframe();
 310
 311         /* use the old database if present */
 312         tdbfile = state_path(talloc_tos(), "winbindd_idmap.tdb");
 313         if (!tdbfile) {
 314                 DEBUG(0, ("Out of memory!\n"));
 315                 ret = NT_STATUS_NO_MEMORY;
 316                 goto done;
 317         }
 318
 319         DEBUG(10,("Opening tdbfile %s\n", tdbfile ));
 320
 321         /* Open idmap repository */
 322         db = db_open(mem_ctx, tdbfile, 0, TDB_DEFAULT, O_RDWR | O_CREAT, 0644,
 323                      DBWRAP_LOCK_ORDER_1, DBWRAP_FLAG_NONE);
 324         if (!db) {
 325                 DEBUG(0, ("Unable to open idmap database\n"));
 326                 ret = NT_STATUS_UNSUCCESSFUL;
 327                 goto done;
 328         }
 329
 330         /* check against earlier versions */
 331         ret = dbwrap_fetch_int32_bystring(db, "IDMAP_VERSION", &version);
 332         if (!NT_STATUS_IS_OK(ret)) {
 333                 version = -1;
 334         }
 335
 336         if (version != IDMAP_VERSION) {
 337                 if (config_error) {
 338                         DEBUG(0,("Upgrade of IDMAP_VERSION from %d to %d is not "
 339                                  "possible with incomplete configuration\n",
 340                                  version, IDMAP_VERSION));
 341                         ret = NT_STATUS_UNSUCCESSFUL;
 342                         goto done;
 343                 }
 344                 if (dbwrap_transaction_start(db) != 0) {
 345                         DEBUG(0, ("Unable to start upgrade transaction!\n"));
 346                         ret = NT_STATUS_INTERNAL_DB_ERROR;
 347                         goto done;
 348                 }
 349
 350                 if (!idmap_tdb_upgrade(dom, db)) {
 351                         dbwrap_transaction_cancel(db);
 352                         DEBUG(0, ("Unable to open idmap database, it's in an old format, and upgrade failed!\n"));
 353                         ret = NT_STATUS_INTERNAL_DB_ERROR;
 354                         goto done;
 355                 }
 356
 357                 if (dbwrap_transaction_commit(db) != 0) {
 358                         DEBUG(0, ("Unable to commit upgrade transaction!\n"));
 359                         ret = NT_STATUS_INTERNAL_DB_ERROR;
 360                         goto done;
 361                 }
 362         }
 363
 364         ctx->db = talloc_move(ctx, &db);
 365
 366         ret = idmap_tdb_init_hwm(dom);
 367
 368 done:
 369         talloc_free(mem_ctx);
 370         return ret;
 371 }
 372
 373 /**********************************************************************
 374  IDMAP MAPPING TDB BACKEND
 375 **********************************************************************/
 376
 377 /*****************************
 378  Initialise idmap database.
 379 *****************************/
 380
 381 static NTSTATUS idmap_tdb_db_init(struct idmap_domain *dom)
 382 {
 383         NTSTATUS ret;
 384         struct idmap_tdb_common_context *ctx;
 385
 386         DEBUG(10, ("idmap_tdb_db_init called for domain '%s'\n", dom->name));
 387
 388         ctx = talloc_zero(dom, struct idmap_tdb_common_context);
 389         if ( ! ctx) {
 390                 DEBUG(0, ("Out of memory!\n"));
 391                 return NT_STATUS_NO_MEMORY;
 392         }
 393
 394         /* load backend specific configuration here: */
 395 #if 0
 396         if (strequal(dom->name, "*")) {
 397         } else {
 398         }
 399 #endif
 400
 401         ctx->rw_ops = talloc_zero(ctx, struct idmap_rw_ops);
 402         if (ctx->rw_ops == NULL) {
 403                 DEBUG(0, ("Out of memory!\n"));
 404                 ret = NT_STATUS_NO_MEMORY;
 405                 goto failed;
 406         }
 407
 408         ctx->max_id = dom->high_id;
 409         ctx->hwmkey_uid = HWM_USER;
 410         ctx->hwmkey_gid = HWM_GROUP;
 411
 412         ctx->rw_ops->get_new_id = idmap_tdb_common_get_new_id;
 413         ctx->rw_ops->set_mapping = idmap_tdb_common_set_mapping;
 414
 415         dom->private_data = ctx;
 416
 417         ret = idmap_tdb_open_db(dom);
 418         if ( ! NT_STATUS_IS_OK(ret)) {
 419                 goto failed;
 420         }
 421
 422         return NT_STATUS_OK;
 423
 424 failed:
 425         talloc_free(ctx);
 426         return ret;
 427 }
 428
 429 static struct idmap_methods db_methods = {
 430         .init = idmap_tdb_db_init,
 431         .unixids_to_sids = idmap_tdb_common_unixids_to_sids,
 432         .sids_to_unixids = idmap_tdb_common_sids_to_unixids,
 433         .allocate_id = idmap_tdb_common_get_new_id,
 434 };
 435
 436 NTSTATUS idmap_tdb_init(TALLOC_CTX *mem_ctx)
 437 {
 438         DEBUG(10, ("calling idmap_tdb_init\n"));
 439
 440         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "tdb", &db_methods);
 441 }