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    Copyright (C) Anatoliy Atanasov 2010
  10
  11    based on drepl_ridalloc.c
  12
  13    This program is free software; you can redistribute it and/or modify
  14    it under the terms of the GNU General Public License as published by
  15    the Free Software Foundation; either version 3 of the License, or
  16    (at your option) any later version.
  17
  18    This program is distributed in the hope that it will be useful,
  19    but WITHOUT ANY WARRANTY; without even the implied warranty of
  20    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21    GNU General Public License for more details.
  22
  23    You should have received a copy of the GNU General Public License
  24    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  25
  26 */
  27
  28 #include "includes.h"
  29 #include "dsdb/samdb/samdb.h"
  30 #include "smbd/service.h"
  31 #include "dsdb/repl/drepl_service.h"
  32 #include "param/param.h"
  33
  34 struct fsmo_role_state {
  35         struct irpc_message *msg;
  36         struct drepl_takeFSMORole *r;
  37 };
  38
  39 static void drepl_role_callback(struct dreplsrv_service *service,
  40                                 WERROR werr,
  41                                 enum drsuapi_DsExtendedError ext_err,
  42                                 void *cb_data)
  43 {
  44         struct fsmo_role_state *fsmo = talloc_get_type_abort(cb_data, struct fsmo_role_state);
  45         if (!W_ERROR_IS_OK(werr)) {
  46                 DEBUG(2,(__location__ ": Failed role transfer - %s - extended_ret[0x%X]\n",
  47                          win_errstr(werr), ext_err));
  48         } else {
  49                 DEBUG(2,(__location__ ": Successful role transfer\n"));
  50         }
  51         fsmo->r->out.result = werr;
  52         irpc_send_reply(fsmo->msg, NT_STATUS_OK);
  53 }
  54
  55 static bool fsmo_master_equal(struct ldb_dn *ntds_dn, struct ldb_dn *role_owner_dn)
  56 {
  57         if (ldb_dn_compare(ntds_dn, role_owner_dn) == 0) {
  58                 DEBUG(0,("\nWe are the FSMO master.\n"));
  59                 return true;
  60         }
  61         return false;
  62 }
  63
  64 /*
  65   see which role is we are asked to assume, initialize data and send request
  66  */
  67 NTSTATUS drepl_take_FSMO_role(struct irpc_message *msg,
  68                               struct drepl_takeFSMORole *r)
  69 {
  70         struct dreplsrv_service *service = talloc_get_type(msg->private_data,
  71                                                            struct dreplsrv_service);
  72         struct ldb_dn *role_owner_dn, *fsmo_role_dn, *ntds_dn;
  73         TALLOC_CTX *tmp_ctx = talloc_new(service);
  74         uint64_t fsmo_info = 0;
  75         enum drsuapi_DsExtendedOperation extended_op = DRSUAPI_EXOP_NONE;
  76         WERROR werr;
  77         enum drepl_role_master role = r->in.role;
  78         struct fsmo_role_state *fsmo;
  79
  80         ntds_dn = samdb_ntds_settings_dn(service->samdb);
  81         if (!ntds_dn) {
  82                 r->out.result = WERR_DS_DRA_INTERNAL_ERROR;
  83                 return NT_STATUS_OK;
  84         }
  85
  86         werr = dsdb_get_fsmo_role_info(tmp_ctx, service->samdb, role,
  87                                        &fsmo_role_dn, &role_owner_dn);
  88         if (!W_ERROR_IS_OK(werr)) {
  89                 r->out.result = werr;
  90                 return NT_STATUS_OK;
  91         }
  92
  93         switch (role) {
  94         case DREPL_NAMING_MASTER:
  95         case DREPL_INFRASTRUCTURE_MASTER:
  96         case DREPL_SCHEMA_MASTER:
  97                 extended_op = DRSUAPI_EXOP_FSMO_REQ_ROLE;
  98                 break;
  99         case DREPL_RID_MASTER:
 100                 extended_op = DRSUAPI_EXOP_FSMO_RID_REQ_ROLE;
 101                 break;
 102         case DREPL_PDC_MASTER:
 103                 extended_op = DRSUAPI_EXOP_FSMO_REQ_PDC;
 104                 break;
 105         default:
 106                 DEBUG(2,("Unknown role %u in role transfer\n",
 107                          (unsigned)role));
 108                 r->out.result = WERR_DS_DRA_INTERNAL_ERROR;
 109                 return NT_STATUS_OK;
 110         }
 111
 112         if (fsmo_master_equal(ntds_dn, role_owner_dn) ||
 113             (extended_op == DRSUAPI_EXOP_NONE)) {
 114                 DEBUG(0,("FSMO role check failed for DN %s and owner %s \n",
 115                          ldb_dn_get_linearized(fsmo_role_dn),
 116                          ldb_dn_get_linearized(role_owner_dn)));
 117                 r->out.result = WERR_OK;
 118                 return NT_STATUS_OK;
 119         }
 120
 121         fsmo = talloc(msg, struct fsmo_role_state);
 122         NT_STATUS_HAVE_NO_MEMORY(fsmo);
 123
 124         fsmo->msg = msg;
 125         fsmo->r   = r;
 126
 127         werr = drepl_request_extended_op(service,
 128                                          fsmo_role_dn,
 129                                          role_owner_dn,
 130                                          extended_op,
 131                                          fsmo_info,
 132                                          0,
 133                                          drepl_role_callback,
 134                                          fsmo);
 135         if (!W_ERROR_IS_OK(werr)) {
 136                 r->out.result = werr;
 137                 return NT_STATUS_OK;
 138         }
 139
 140         /* mark this message to be answered later */
 141         msg->defer_reply = true;
 142         dreplsrv_run_pending_ops(service);
 143         return NT_STATUS_OK;
 144 }