source4/dsdb/repl/drepl_fsmo.c

   1 /*
   2    Unix SMB/CIFS mplementation.
   3
   4    DSDB replication service - FSMO role change
   5
   6    Copyright (C) Nadezhda Ivanova 2010
   7    Copyright (C) Andrew Tridgell 2010
   8    Copyright (C) Andrew Bartlett 2010
   9
  10    based on drepl_ridalloc.c
  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
  27 #include "includes.h"
  28 #include "dsdb/samdb/samdb.h"
  29 #include "smbd/service.h"
  30 #include "dsdb/repl/drepl_service.h"
  31 #include "param/param.h"
  32 #include "lib/messaging/irpc.h"
  33 #include "librpc/gen_ndr/ndr_irpc.h"
  34
  35 static void drepl_role_callback(struct dreplsrv_service *service,
  36                                 WERROR werr,
  37                                 enum drsuapi_DsExtendedError ext_err,
  38                                 void *cb_data)
  39 {
  40         if (!W_ERROR_IS_OK(werr)) {
  41                 DEBUG(0,(__location__ ": Failed role transfer - %s - extended_ret[0x%X]\n",
  42                          win_errstr(werr), ext_err));
  43         } else {
  44                 DEBUG(0,(__location__ ": Successful role transfer\n"));
  45         }
  46         service->role_transfer_in_progress = false;
  47 }
  48
  49 static bool fsmo_master_cmp(struct ldb_dn *ntds_dn, struct ldb_dn *role_owner_dn)
  50 {
  51         if (ldb_dn_compare(ntds_dn, role_owner_dn) == 0) {
  52                 DEBUG(0,("\nWe are the FSMO master.\n"));
  53                 return true;
  54         }
  55         return false;
  56 }
  57
  58 /*
  59   see which role is we are asked to assume, initialize data and send request
  60  */
  61 WERROR dreplsrv_fsmo_role_check(struct dreplsrv_service *service,
  62                                 uint32_t role)
  63 {
  64         struct ldb_dn *role_owner_dn, *fsmo_role_dn, *ntds_dn;
  65         TALLOC_CTX *tmp_ctx = talloc_new(service);
  66         struct ldb_context *ldb = service->samdb;
  67         int ret;
  68         uint64_t fsmo_info = 0;
  69         enum drsuapi_DsExtendedOperation extended_op = DRSUAPI_EXOP_NONE;
  70         WERROR werr;
  71
  72         if (service->role_transfer_in_progress) {
  73                 talloc_free(tmp_ctx);
  74                 /* should we allow these in parallel? */
  75                 return WERR_DS_DRA_REPL_PENDING;
  76         }
  77
  78         ntds_dn = samdb_ntds_settings_dn(ldb);
  79         if (!ntds_dn) {
  80                 return WERR_DS_DRA_INTERNAL_ERROR;
  81         }
  82
  83         switch (role) {
  84         case DREPL_NAMING_MASTER:
  85                 fsmo_role_dn = samdb_partitions_dn(ldb, tmp_ctx),
  86                 ret = samdb_reference_dn(ldb, tmp_ctx, fsmo_role_dn, "fSMORoleOwner", &role_owner_dn);
  87                 if (ret != LDB_SUCCESS) {
  88                         DEBUG(0,(__location__ ": Failed to find fSMORoleOwner in Naming Master object - %s",
  89                                  ldb_errstring(ldb)));
  90                         talloc_free(tmp_ctx);
  91                         return WERR_DS_DRA_INTERNAL_ERROR;
  92                 }
  93                 break;
  94         case DREPL_INFRASTRUCTURE_MASTER:
  95                 fsmo_role_dn = samdb_infrastructure_dn(ldb, tmp_ctx);
  96                 ret = samdb_reference_dn(ldb, tmp_ctx, fsmo_role_dn, "fSMORoleOwner", &role_owner_dn);
  97                 if (ret != LDB_SUCCESS) {
  98                         DEBUG(0,(__location__ ": Failed to find fSMORoleOwner in Schema Master object - %s",
  99                                  ldb_errstring(ldb)));
 100                         talloc_free(tmp_ctx);
 101                         return WERR_DS_DRA_INTERNAL_ERROR;
 102                 }
 103                 extended_op = DRSUAPI_EXOP_FSMO_REQ_ROLE;
 104                 break;
 105         case DREPL_RID_MASTER:
 106                 ret = samdb_rid_manager_dn(ldb, tmp_ctx, &fsmo_role_dn);
 107                 if (ret != LDB_SUCCESS) {
 108                         DEBUG(0, (__location__ ": Failed to find RID Manager object - %s", ldb_errstring(ldb)));
 109                         talloc_free(tmp_ctx);
 110                         return WERR_DS_DRA_INTERNAL_ERROR;
 111                 }
 112
 113                 ret = samdb_reference_dn(ldb, tmp_ctx, fsmo_role_dn, "fSMORoleOwner", &role_owner_dn);
 114                 if (ret != LDB_SUCCESS) {
 115                         DEBUG(0,(__location__ ": Failed to find fSMORoleOwner in RID Manager object - %s",
 116                                  ldb_errstring(ldb)));
 117                         talloc_free(tmp_ctx);
 118                         return WERR_DS_DRA_INTERNAL_ERROR;
 119                 }
 120                 extended_op = DRSUAPI_EXOP_FSMO_RID_REQ_ROLE;
 121                 break;
 122         case DREPL_SCHEMA_MASTER:
 123                 fsmo_role_dn = ldb_get_schema_basedn(ldb);
 124                 ret = samdb_reference_dn(ldb, tmp_ctx, fsmo_role_dn, "fSMORoleOwner", &role_owner_dn);
 125                 if (ret != LDB_SUCCESS) {
 126                         DEBUG(0,(__location__ ": Failed to find fSMORoleOwner in Schema Master object - %s",
 127                                  ldb_errstring(ldb)));
 128                         talloc_free(tmp_ctx);
 129                         return WERR_DS_DRA_INTERNAL_ERROR;
 130                 }
 131                 extended_op = DRSUAPI_EXOP_FSMO_REQ_ROLE;
 132                 break;
 133         case DREPL_PDC_MASTER:
 134                 fsmo_role_dn = ldb_get_default_basedn(ldb);
 135                 ret = samdb_reference_dn(ldb, tmp_ctx, fsmo_role_dn, "fSMORoleOwner", &role_owner_dn);
 136                 if (ret != LDB_SUCCESS) {
 137                         DEBUG(0,(__location__ ": Failed to find fSMORoleOwner in Pd Master object - %s",
 138                                  ldb_errstring(ldb)));
 139                         talloc_free(tmp_ctx);
 140                         return WERR_DS_DRA_INTERNAL_ERROR;
 141                 }
 142                 extended_op = DRSUAPI_EXOP_FSMO_REQ_PDC;
 143                 break;
 144         default:
 145                 return WERR_DS_DRA_INTERNAL_ERROR;
 146         }
 147
 148         if (fsmo_master_cmp(ntds_dn, role_owner_dn) ||
 149             (extended_op == DRSUAPI_EXOP_NONE)) {
 150                 DEBUG(0,("FSMO role check failed for DN %s and owner %s ",
 151                          ldb_dn_get_linearized(fsmo_role_dn),
 152                          ldb_dn_get_linearized(role_owner_dn)));
 153                 return WERR_OK;
 154         }
 155
 156         werr = drepl_request_extended_op(service,
 157                                          fsmo_role_dn,
 158                                          role_owner_dn,
 159                                          extended_op,
 160                                          fsmo_info,
 161                                          drepl_role_callback);
 162         if (W_ERROR_IS_OK(werr)) {
 163                 dreplsrv_run_pending_ops(service);
 164         } else {
 165                 DEBUG(0,("%s: drepl_request_extended_op() failed with %s",
 166                          __FUNCTION__, win_errstr(werr)));
 167         }
 168         return werr;
 169 }