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 "ldb_module.h"
  25 #include "dsdb/samdb/samdb.h"
  26 #include "librpc/gen_ndr/ndr_misc.h"
  27 #include "librpc/gen_ndr/ndr_drsuapi.h"
  28 #include "librpc/gen_ndr/ndr_drsblobs.h"
  29 #include "../lib/util/dlinklist.h"
  30
  31 static int pdc_fsmo_init(struct ldb_module *module)
  32 {
  33         struct ldb_context *ldb;
  34         TALLOC_CTX *mem_ctx;
  35         struct ldb_dn *pdc_dn;
  36         struct dsdb_pdc_fsmo *pdc_fsmo;
  37         struct ldb_result *pdc_res;
  38         int ret;
  39         static const char *pdc_attrs[] = {
  40                 "fSMORoleOwner",
  41                 NULL
  42         };
  43
  44         ldb = ldb_module_get_ctx(module);
  45
  46         mem_ctx = talloc_new(module);
  47         if (!mem_ctx) {
  48                 ldb_oom(ldb);
  49                 return LDB_ERR_OPERATIONS_ERROR;
  50         }
  51
  52         pdc_dn = samdb_base_dn(ldb);
  53         if (!pdc_dn) {
  54                 ldb_debug(ldb, LDB_DEBUG_WARNING,
  55                           "pdc_fsmo_init: no domain dn present: (skip loading of domain details)\n");
  56                 talloc_free(mem_ctx);
  57                 return ldb_next_init(module);
  58         }
  59
  60         pdc_fsmo = talloc_zero(mem_ctx, struct dsdb_pdc_fsmo);
  61         if (!pdc_fsmo) {
  62                 ldb_oom(ldb);
  63                 return LDB_ERR_OPERATIONS_ERROR;
  64         }
  65         ldb_module_set_private(module, pdc_fsmo);
  66
  67         ret = ldb_search(ldb, mem_ctx, &pdc_res,
  68                          pdc_dn, LDB_SCOPE_BASE,
  69                          pdc_attrs, NULL);
  70         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
  71                 ldb_debug(ldb, LDB_DEBUG_WARNING,
  72                           "pdc_fsmo_init: no domain object present: (skip loading of domain details)\n");
  73                 talloc_free(mem_ctx);
  74                 return ldb_next_init(module);
  75         } else if (ret != LDB_SUCCESS) {
  76                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
  77                               "pdc_fsmo_init: failed to search the domain object: %d:%s",
  78                               ret, ldb_strerror(ret));
  79                 talloc_free(mem_ctx);
  80                 return ret;
  81         }
  82         if (pdc_res->count == 0) {
  83                 ldb_debug(ldb, LDB_DEBUG_WARNING,
  84                           "pdc_fsmo_init: no domain object present: (skip loading of domain details)\n");
  85                 talloc_free(mem_ctx);
  86                 return ldb_next_init(module);
  87         } else if (pdc_res->count > 1) {
  88                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
  89                               "pdc_fsmo_init: [%u] domain objects found on a base search",
  90                               pdc_res->count);
  91                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
  92                 talloc_free(mem_ctx);
  93                 return LDB_ERR_CONSTRAINT_VIOLATION;
  94         }
  95
  96         pdc_fsmo->master_dn = ldb_msg_find_attr_as_dn(ldb, mem_ctx, pdc_res->msgs[0], "fSMORoleOwner");
  97         if (ldb_dn_compare(samdb_ntds_settings_dn(ldb), pdc_fsmo->master_dn) == 0) {
  98                 pdc_fsmo->we_are_master = true;
  99         } else {
 100                 pdc_fsmo->we_are_master = false;
 101         }
 102
 103         if (ldb_set_opaque(ldb, "dsdb_pdc_fsmo", pdc_fsmo) != LDB_SUCCESS) {
 104                 ldb_oom(ldb);
 105                 return LDB_ERR_OPERATIONS_ERROR;
 106         }
 107
 108         talloc_steal(module, pdc_fsmo);
 109
 110         ldb_debug(ldb, LDB_DEBUG_TRACE,
 111                           "pdc_fsmo_init: we are master: %s\n",
 112                           (pdc_fsmo->we_are_master?"yes":"no"));
 113
 114         talloc_free(mem_ctx);
 115         return ldb_next_init(module);
 116 }
 117
 118 _PUBLIC_ const struct ldb_module_ops ldb_pdc_fsmo_module_ops = {
 119         .name           = "pdc_fsmo",
 120         .init_context   = pdc_fsmo_init
 121 };