source4/dsdb/samdb/ldb_modules/pdc_fsmo.c

   1 /*
   2    Unix SMB/CIFS mplementation.
   3
   4    The module that handles the PDC FSMO Role Owner checkings
   5
   6    Copyright (C) Stefan Metzmacher 2007
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20
  21 */
  22
  23 #include "includes.h"
  24 #include "lib/ldb/include/ldb.h"
  25 #include "lib/ldb/include/ldb_errors.h"
  26 #include "lib/ldb/include/ldb_private.h"
  27 #include "dsdb/samdb/samdb.h"
  28 #include "librpc/gen_ndr/ndr_misc.h"
  29 #include "librpc/gen_ndr/ndr_drsuapi.h"
  30 #include "librpc/gen_ndr/ndr_drsblobs.h"
  31 #include "lib/util/dlinklist.h"
  32
  33 static int pdc_fsmo_init(struct ldb_module *module)
  34 {
  35         TALLOC_CTX *mem_ctx;
  36         struct ldb_dn *pdc_dn;
  37         struct dsdb_pdc_fsmo *pdc_fsmo;
  38         struct ldb_result *pdc_res;
  39         int ret;
  40         static const char *pdc_attrs[] = {
  41                 "fSMORoleOwner",
  42                 NULL
  43         };
  44
  45         mem_ctx = talloc_new(module);
  46         if (!mem_ctx) {
  47                 ldb_oom(module->ldb);
  48                 return LDB_ERR_OPERATIONS_ERROR;
  49         }
  50
  51         pdc_dn = samdb_base_dn(module->ldb);
  52         if (!pdc_dn) {
  53                 ldb_debug(module->ldb, LDB_DEBUG_WARNING,
  54                           "pdc_fsmo_init: no domain dn present: (skip loading of domain details)\n");
  55                 talloc_free(mem_ctx);
  56                 return ldb_next_init(module);
  57         }
  58
  59         pdc_fsmo = talloc_zero(mem_ctx, struct dsdb_pdc_fsmo);
  60         if (!pdc_fsmo) {
  61                 ldb_oom(module->ldb);
  62                 return LDB_ERR_OPERATIONS_ERROR;
  63         }
  64         module->private_data = pdc_fsmo;
  65
  66         ret = ldb_search(module->ldb, mem_ctx, &pdc_res,
  67                          pdc_dn, LDB_SCOPE_BASE,
  68                          pdc_attrs, NULL);
  69         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
  70                 ldb_debug(module->ldb, LDB_DEBUG_WARNING,
  71                           "pdc_fsmo_init: no domain object present: (skip loading of domain details)\n");
  72                 talloc_free(mem_ctx);
  73                 return ldb_next_init(module);
  74         } else if (ret != LDB_SUCCESS) {
  75                 ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
  76                               "pdc_fsmo_init: failed to search the domain object: %d:%s",
  77                               ret, ldb_strerror(ret));
  78                 talloc_free(mem_ctx);
  79                 return ret;
  80         }
  81         if (pdc_res->count == 0) {
  82                 ldb_debug(module->ldb, LDB_DEBUG_WARNING,
  83                           "pdc_fsmo_init: no domain object present: (skip loading of domain details)\n");
  84                 talloc_free(mem_ctx);
  85                 return ldb_next_init(module);
  86         } else if (pdc_res->count > 1) {
  87                 ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
  88                               "pdc_fsmo_init: [%u] domain objects found on a base search",
  89                               pdc_res->count);
  90                 talloc_free(mem_ctx);
  91                 return LDB_ERR_CONSTRAINT_VIOLATION;
  92         }
  93
  94         pdc_fsmo->master_dn = ldb_msg_find_attr_as_dn(module->ldb, mem_ctx, pdc_res->msgs[0], "fSMORoleOwner");
  95         if (ldb_dn_compare(samdb_ntds_settings_dn(module->ldb), pdc_fsmo->master_dn) == 0) {
  96                 pdc_fsmo->we_are_master = true;
  97         } else {
  98                 pdc_fsmo->we_are_master = false;
  99         }
 100
 101         if (ldb_set_opaque(module->ldb, "dsdb_pdc_fsmo", pdc_fsmo) != LDB_SUCCESS) {
 102                 ldb_oom(module->ldb);
 103                 return LDB_ERR_OPERATIONS_ERROR;
 104         }
 105
 106         talloc_steal(module, pdc_fsmo);
 107
 108         ldb_debug(module->ldb, LDB_DEBUG_TRACE,
 109                           "pdc_fsmo_init: we are master: %s\n",
 110                           (pdc_fsmo->we_are_master?"yes":"no"));
 111
 112         talloc_free(mem_ctx);
 113         return ldb_next_init(module);
 114 }
 115
 116 _PUBLIC_ const struct ldb_module_ops ldb_pdc_fsmo_module_ops = {
 117         .name           = "pdc_fsmo",
 118         .init_context   = pdc_fsmo_init
 119 };