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 rid;
  66         fstring 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         sid_to_fstring(keystr, &sid);
 108         key2 = string_term_tdb_data(keystr);
 109
 110         value = dbwrap_record_get_value(rec);
 111
 112         status = dbwrap_store(s->db, key2, value, TDB_INSERT);
 113         if (!NT_STATUS_IS_OK(status)) {
 114                 DEBUG(0,("Unable to add record %s:%s\n",
 115                         (const char *)key2.dptr,
 116                         nt_errstr(status)));
 117                 s->failed = true;
 118                 return -1;
 119         }
 120
 121         status = dbwrap_store(s->db, value, key2, TDB_REPLACE);
 122         if (!NT_STATUS_IS_OK(status)) {
 123                 DEBUG(0,("Unable to update record %s:%s\n",
 124                         (const char *)value.dptr,
 125                         nt_errstr(status)));
 126                 s->failed = true;
 127                 return -1;
 128         }
 129
 130         status = dbwrap_record_delete(rec);
 131         if (!NT_STATUS_IS_OK(status)) {
 132                 DEBUG(0,("Unable to delete record %s:%s\n",
 133                         (const char *)key.dptr,
 134                         nt_errstr(status)));
 135                 s->failed = true;
 136                 return -1;
 137         }
 138
 139         return 0;
 140 }
 141
 142 /*****************************************************************************
 143  Convert the idmap database from an older version.
 144 *****************************************************************************/
 145
 146 static bool idmap_tdb_upgrade(struct idmap_domain *dom, struct db_context *db)
 147 {
 148         int32 vers;
 149         bool bigendianheader;
 150         struct convert_fn_state s;
 151         NTSTATUS status;
 152
 153         /* If we are bigendian, tdb is bigendian if NOT converted. */
 154         union {
 155                 uint16 large;
 156                 unsigned char small[2];
 157         } u;
 158         u.large = 0x0102;
 159         if (u.small[0] == 0x01)
 160                 bigendianheader = !(dbwrap_get_flags(db) & TDB_CONVERT);
 161         else {
 162                 assert(u.small[0] == 0x02);
 163                 bigendianheader = (dbwrap_get_flags(db) & TDB_CONVERT);
 164         }
 165         DEBUG(0, ("Upgrading winbindd_idmap.tdb from an old version\n"));
 166
 167         status = dbwrap_fetch_int32_bystring(db, "IDMAP_VERSION", &vers);
 168         if (!NT_STATUS_IS_OK(status)) {
 169                 vers = -1;
 170         }
 171
 172         if (((vers == -1) && bigendianheader) || (IREV(vers) == IDMAP_VERSION)) {
 173                 /* Arrggghh ! Bytereversed or old big-endian - make order independent ! */
 174                 /*
 175                  * high and low records were created on a
 176                  * big endian machine and will need byte-reversing.
 177                  */
 178
 179                 int32 wm;
 180
 181                 status = dbwrap_fetch_int32_bystring(db, HWM_USER, &wm);
 182                 if (!NT_STATUS_IS_OK(status)) {
 183                         wm = -1;
 184                 }
 185
 186                 if (wm != -1) {
 187                         wm = IREV(wm);
 188                 }  else {
 189                         wm = dom->low_id;
 190                 }
 191
 192                 status = dbwrap_store_int32_bystring(db, HWM_USER, wm);
 193                 if (!NT_STATUS_IS_OK(status)) {
 194                         DEBUG(0, ("Unable to byteswap user hwm in idmap "
 195                                   "database: %s\n", nt_errstr(status)));
 196                         return False;
 197                 }
 198
 199                 status = dbwrap_fetch_int32_bystring(db, HWM_GROUP, &wm);
 200                 if (!NT_STATUS_IS_OK(status)) {
 201                         wm = -1;
 202                 }
 203
 204                 if (wm != -1) {
 205                         wm = IREV(wm);
 206                 } else {
 207                         wm = dom->low_id;
 208                 }
 209
 210                 status = dbwrap_store_int32_bystring(db, HWM_GROUP, wm);
 211                 if (!NT_STATUS_IS_OK(status)) {
 212                         DEBUG(0, ("Unable to byteswap group hwm in idmap "
 213                                   "database: %s\n", nt_errstr(status)));
 214                         return False;
 215                 }
 216         }
 217
 218         s.db = db;
 219         s.failed = false;
 220
 221         /* the old format stored as DOMAIN/rid - now we store the SID direct */
 222         status = dbwrap_traverse(db, convert_fn, &s, NULL);
 223
 224         if (!NT_STATUS_IS_OK(status)) {
 225                 DEBUG(0, ("Database traverse failed during conversion\n"));
 226                 return false;
 227         }
 228
 229         if (s.failed) {
 230                 DEBUG(0, ("Problem during conversion\n"));
 231                 return False;
 232         }
 233
 234         status = dbwrap_store_int32_bystring(db, "IDMAP_VERSION",
 235                                              IDMAP_VERSION);
 236         if (!NT_STATUS_IS_OK(status)) {
 237                 DEBUG(0, ("Unable to store idmap version in database: %s\n",
 238                           nt_errstr(status)));
 239                 return False;
 240         }
 241
 242         return True;
 243 }
 244
 245 static NTSTATUS idmap_tdb_init_hwm(struct idmap_domain *dom)
 246 {
 247         uint32_t low_uid;
 248         uint32_t low_gid;
 249         bool update_uid = false;
 250         bool update_gid = false;
 251         struct idmap_tdb_common_context *ctx;
 252         NTSTATUS status;
 253
 254         ctx = talloc_get_type(dom->private_data,
 255                               struct idmap_tdb_common_context);
 256
 257         status = dbwrap_fetch_uint32_bystring(ctx->db, HWM_USER, &low_uid);
 258         if (!NT_STATUS_IS_OK(status) || low_uid < dom->low_id) {
 259                 update_uid = true;
 260         }
 261
 262         status = dbwrap_fetch_uint32_bystring(ctx->db, HWM_GROUP, &low_gid);
 263         if (!NT_STATUS_IS_OK(status) || low_gid < dom->low_id) {
 264                 update_gid = true;
 265         }
 266
 267         if (!update_uid && !update_gid) {
 268                 return NT_STATUS_OK;
 269         }
 270
 271         if (dbwrap_transaction_start(ctx->db) != 0) {
 272                 DEBUG(0, ("Unable to start upgrade transaction!\n"));
 273                 return NT_STATUS_INTERNAL_DB_ERROR;
 274         }
 275
 276         if (update_uid) {
 277                 status = dbwrap_store_uint32_bystring(ctx->db, HWM_USER,
 278                                                       dom->low_id);
 279                 if (!NT_STATUS_IS_OK(status)) {
 280                         dbwrap_transaction_cancel(ctx->db);
 281                         DEBUG(0, ("Unable to initialise user hwm in idmap "
 282                                   "database: %s\n", nt_errstr(status)));
 283                         return NT_STATUS_INTERNAL_DB_ERROR;
 284                 }
 285         }
 286
 287         if (update_gid) {
 288                 status = dbwrap_store_uint32_bystring(ctx->db, HWM_GROUP,
 289                                                       dom->low_id);
 290                 if (!NT_STATUS_IS_OK(status)) {
 291                         dbwrap_transaction_cancel(ctx->db);
 292                         DEBUG(0, ("Unable to initialise group hwm in idmap "
 293                                   "database: %s\n", nt_errstr(status)));
 294                         return NT_STATUS_INTERNAL_DB_ERROR;
 295                 }
 296         }
 297
 298         if (dbwrap_transaction_commit(ctx->db) != 0) {
 299                 DEBUG(0, ("Unable to commit upgrade transaction!\n"));
 300                 return NT_STATUS_INTERNAL_DB_ERROR;
 301         }
 302
 303         return NT_STATUS_OK;
 304 }
 305
 306 static NTSTATUS idmap_tdb_open_db(struct idmap_domain *dom)
 307 {
 308         NTSTATUS ret;
 309         TALLOC_CTX *mem_ctx;
 310         char *tdbfile = NULL;
 311         struct db_context *db = NULL;
 312         int32_t version;
 313         bool config_error = false;
 314         struct idmap_tdb_common_context *ctx;
 315
 316         ctx = talloc_get_type(dom->private_data,
 317                               struct idmap_tdb_common_context);
 318
 319         if (ctx->db) {
 320                 /* it is already open */
 321                 return NT_STATUS_OK;
 322         }
 323
 324         /* use our own context here */
 325         mem_ctx = talloc_stackframe();
 326
 327         /* use the old database if present */
 328         tdbfile = state_path("winbindd_idmap.tdb");
 329         if (!tdbfile) {
 330                 DEBUG(0, ("Out of memory!\n"));
 331                 ret = NT_STATUS_NO_MEMORY;
 332                 goto done;
 333         }
 334
 335         DEBUG(10,("Opening tdbfile %s\n", tdbfile ));
 336
 337         /* Open idmap repository */
 338         db = db_open(mem_ctx, tdbfile, 0, TDB_DEFAULT, O_RDWR | O_CREAT, 0644,
 339                      DBWRAP_LOCK_ORDER_1);
 340         if (!db) {
 341                 DEBUG(0, ("Unable to open idmap database\n"));
 342                 ret = NT_STATUS_UNSUCCESSFUL;
 343                 goto done;
 344         }
 345
 346         /* check against earlier versions */
 347         ret = dbwrap_fetch_int32_bystring(db, "IDMAP_VERSION", &version);
 348         if (!NT_STATUS_IS_OK(ret)) {
 349                 version = -1;
 350         }
 351
 352         if (version != IDMAP_VERSION) {
 353                 if (config_error) {
 354                         DEBUG(0,("Upgrade of IDMAP_VERSION from %d to %d is not "
 355                                  "possible with incomplete configuration\n",
 356                                  version, IDMAP_VERSION));
 357                         ret = NT_STATUS_UNSUCCESSFUL;
 358                         goto done;
 359                 }
 360                 if (dbwrap_transaction_start(db) != 0) {
 361                         DEBUG(0, ("Unable to start upgrade transaction!\n"));
 362                         ret = NT_STATUS_INTERNAL_DB_ERROR;
 363                         goto done;
 364                 }
 365
 366                 if (!idmap_tdb_upgrade(dom, db)) {
 367                         dbwrap_transaction_cancel(db);
 368                         DEBUG(0, ("Unable to open idmap database, it's in an old format, and upgrade failed!\n"));
 369                         ret = NT_STATUS_INTERNAL_DB_ERROR;
 370                         goto done;
 371                 }
 372
 373                 if (dbwrap_transaction_commit(db) != 0) {
 374                         DEBUG(0, ("Unable to commit upgrade transaction!\n"));
 375                         ret = NT_STATUS_INTERNAL_DB_ERROR;
 376                         goto done;
 377                 }
 378         }
 379
 380         ctx->db = talloc_move(ctx, &db);
 381
 382         ret = idmap_tdb_init_hwm(dom);
 383
 384 done:
 385         talloc_free(mem_ctx);
 386         return ret;
 387 }
 388
 389 /**********************************************************************
 390  IDMAP MAPPING TDB BACKEND
 391 **********************************************************************/
 392
 393 /*****************************
 394  Initialise idmap database.
 395 *****************************/
 396
 397 static NTSTATUS idmap_tdb_db_init(struct idmap_domain *dom)
 398 {
 399         NTSTATUS ret;
 400         struct idmap_tdb_common_context *ctx;
 401
 402         DEBUG(10, ("idmap_tdb_db_init called for domain '%s'\n", dom->name));
 403
 404         ctx = talloc_zero(dom, struct idmap_tdb_common_context);
 405         if ( ! ctx) {
 406                 DEBUG(0, ("Out of memory!\n"));
 407                 return NT_STATUS_NO_MEMORY;
 408         }
 409
 410         /* load backend specific configuration here: */
 411 #if 0
 412         if (strequal(dom->name, "*")) {
 413         } else {
 414         }
 415 #endif
 416
 417         ctx->rw_ops = talloc_zero(ctx, struct idmap_rw_ops);
 418         if (ctx->rw_ops == NULL) {
 419                 DEBUG(0, ("Out of memory!\n"));
 420                 ret = NT_STATUS_NO_MEMORY;
 421                 goto failed;
 422         }
 423
 424         ctx->max_id = dom->high_id;
 425         ctx->hwmkey_uid = HWM_USER;
 426         ctx->hwmkey_gid = HWM_GROUP;
 427
 428         ctx->rw_ops->get_new_id = idmap_tdb_common_get_new_id;
 429         ctx->rw_ops->set_mapping = idmap_tdb_common_set_mapping;
 430
 431         dom->private_data = ctx;
 432
 433         ret = idmap_tdb_open_db(dom);
 434         if ( ! NT_STATUS_IS_OK(ret)) {
 435                 goto failed;
 436         }
 437
 438         return NT_STATUS_OK;
 439
 440 failed:
 441         talloc_free(ctx);
 442         return ret;
 443 }
 444
 445 static struct idmap_methods db_methods = {
 446         .init = idmap_tdb_db_init,
 447         .unixids_to_sids = idmap_tdb_common_unixids_to_sids,
 448         .sids_to_unixids = idmap_tdb_common_sids_to_unixids,
 449         .allocate_id = idmap_tdb_common_get_new_id,
 450 };
 451
 452 NTSTATUS idmap_tdb_init(void)
 453 {
 454         DEBUG(10, ("calling idmap_tdb_init\n"));
 455
 456         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "tdb", &db_methods);
 457 }