source4/rpc_server/drsuapi/updaterefs.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    implement the DRSUpdateRefs call
   5
   6    Copyright (C) Andrew Tridgell 2009
   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 #include "includes.h"
  23 #include "librpc/gen_ndr/ndr_drsuapi.h"
  24 #include "rpc_server/dcerpc_server.h"
  25 #include "rpc_server/common/common.h"
  26 #include "dsdb/samdb/samdb.h"
  27 #include "lib/ldb/include/ldb_errors.h"
  28 #include "param/param.h"
  29 #include "librpc/gen_ndr/ndr_drsblobs.h"
  30 #include "auth/auth.h"
  31 #include "rpc_server/drsuapi/dcesrv_drsuapi.h"
  32 #include "libcli/security/security.h"
  33
  34 struct repsTo {
  35         uint32_t count;
  36         struct repsFromToBlob *r;
  37 };
  38
  39 /*
  40   add a replication destination for a given partition GUID
  41  */
  42 static WERROR uref_add_dest(struct ldb_context *sam_ctx, TALLOC_CTX *mem_ctx,
  43                             struct ldb_dn *dn, struct repsFromTo1 *dest)
  44 {
  45         struct repsTo reps;
  46         WERROR werr;
  47
  48         werr = dsdb_loadreps(sam_ctx, mem_ctx, dn, "repsTo", &reps.r, &reps.count);
  49         if (!W_ERROR_IS_OK(werr)) {
  50                 return werr;
  51         }
  52
  53         reps.r = talloc_realloc(mem_ctx, reps.r, struct repsFromToBlob, reps.count+1);
  54         if (reps.r == NULL) {
  55                 return WERR_DS_DRA_INTERNAL_ERROR;
  56         }
  57         ZERO_STRUCT(reps.r[reps.count]);
  58         reps.r[reps.count].version = 1;
  59         reps.r[reps.count].ctr.ctr1 = *dest;
  60         reps.count++;
  61
  62         werr = dsdb_savereps(sam_ctx, mem_ctx, dn, "repsTo", reps.r, reps.count);
  63         if (!W_ERROR_IS_OK(werr)) {
  64                 return werr;
  65         }
  66
  67         return WERR_OK;
  68 }
  69
  70 /*
  71   delete a replication destination for a given partition GUID
  72  */
  73 static WERROR uref_del_dest(struct ldb_context *sam_ctx, TALLOC_CTX *mem_ctx,
  74                             struct ldb_dn *dn, struct GUID *dest_guid)
  75 {
  76         struct repsTo reps;
  77         WERROR werr;
  78         int i;
  79
  80         werr = dsdb_loadreps(sam_ctx, mem_ctx, dn, "repsTo", &reps.r, &reps.count);
  81         if (!W_ERROR_IS_OK(werr)) {
  82                 return werr;
  83         }
  84
  85         for (i=0; i<reps.count; i++) {
  86                 if (GUID_compare(dest_guid, &reps.r[i].ctr.ctr1.source_dsa_obj_guid) == 0) {
  87                         if (i+1 < reps.count) {
  88                                 memmove(&reps.r[i], &reps.r[i+1], sizeof(reps.r[i])*(reps.count-(i+1)));
  89                         }
  90                         reps.count--;
  91                 }
  92         }
  93
  94         werr = dsdb_savereps(sam_ctx, mem_ctx, dn, "repsTo", reps.r, reps.count);
  95         if (!W_ERROR_IS_OK(werr)) {
  96                 return werr;
  97         }
  98
  99         return WERR_OK;
 100 }
 101
 102 /*
 103   drsuapi_DsReplicaUpdateRefs
 104 */
 105 WERROR dcesrv_drsuapi_DsReplicaUpdateRefs(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx,
 106                                           struct drsuapi_DsReplicaUpdateRefs *r)
 107 {
 108         struct drsuapi_DsReplicaUpdateRefsRequest1 *req;
 109         struct ldb_context *sam_ctx;
 110         WERROR werr;
 111         struct ldb_dn *dn;
 112
 113         if (security_session_user_level(dce_call->conn->auth_state.session_info) <
 114             SECURITY_DOMAIN_CONTROLLER) {
 115                 DEBUG(0,("DsReplicaUpdateRefs refused for security token\n"));
 116                 return WERR_DS_DRA_ACCESS_DENIED;
 117         }
 118
 119         if (r->in.level != 1) {
 120                 DEBUG(0,("DrReplicUpdateRefs - unsupported level %u\n", r->in.level));
 121                 return WERR_DS_DRA_INVALID_PARAMETER;
 122         }
 123
 124         req = &r->in.req.req1;
 125         DEBUG(4,("DsReplicaUpdateRefs for host '%s' with GUID %s options 0x%08x nc=%s\n",
 126                  req->dest_dsa_dns_name, GUID_string(mem_ctx, &req->dest_dsa_guid),
 127                  req->options,
 128                  drs_ObjectIdentifier_to_string(mem_ctx, req->naming_context)));
 129
 130         /* TODO: We need to authenticate this operation pretty carefully */
 131         sam_ctx = samdb_connect(mem_ctx, dce_call->event_ctx, dce_call->conn->dce_ctx->lp_ctx,
 132                                 system_session(mem_ctx, dce_call->conn->dce_ctx->lp_ctx));
 133         if (!sam_ctx) {
 134                 return WERR_DS_DRA_INTERNAL_ERROR;
 135         }
 136
 137         dn = ldb_dn_new(mem_ctx, sam_ctx, req->naming_context->dn);
 138         if (dn == NULL) {
 139                 talloc_free(sam_ctx);
 140                 return WERR_DS_INVALID_DN_SYNTAX;
 141         }
 142
 143         if (ldb_transaction_start(sam_ctx) != LDB_SUCCESS) {
 144                 DEBUG(0,(__location__ ": Failed to start transaction on samdb\n"));
 145                 talloc_free(sam_ctx);
 146                 return WERR_DS_DRA_INTERNAL_ERROR;
 147         }
 148
 149         if (req->options & DRSUAPI_DS_REPLICA_UPDATE_DELETE_REFERENCE) {
 150                 werr = uref_del_dest(sam_ctx, mem_ctx, dn, &req->dest_dsa_guid);
 151                 if (!W_ERROR_IS_OK(werr)) {
 152                         DEBUG(0,("Failed to delete repsTo for %s\n",
 153                                  GUID_string(dce_call, &req->dest_dsa_guid)));
 154                         goto failed;
 155                 }
 156         }
 157
 158         if (req->options & DRSUAPI_DS_REPLICA_UPDATE_ADD_REFERENCE) {
 159                 struct repsFromTo1 dest;
 160                 struct repsFromTo1OtherInfo oi;
 161
 162                 ZERO_STRUCT(dest);
 163                 ZERO_STRUCT(oi);
 164
 165                 oi.dns_name = req->dest_dsa_dns_name;
 166                 dest.other_info          = &oi;
 167                 dest.source_dsa_obj_guid = req->dest_dsa_guid;
 168                 dest.replica_flags       = req->options;
 169
 170                 werr = uref_add_dest(sam_ctx, mem_ctx, dn, &dest);
 171                 if (!W_ERROR_IS_OK(werr)) {
 172                         DEBUG(0,("Failed to delete repsTo for %s\n",
 173                                  GUID_string(dce_call, &dest.source_dsa_obj_guid)));
 174                         goto failed;
 175                 }
 176         }
 177
 178         if (ldb_transaction_commit(sam_ctx) != LDB_SUCCESS) {
 179                 DEBUG(0,(__location__ ": Failed to commit transaction on samdb\n"));
 180                 return WERR_DS_DRA_INTERNAL_ERROR;
 181         }
 182
 183         talloc_free(sam_ctx);
 184         return WERR_OK;
 185
 186 failed:
 187         ldb_transaction_cancel(sam_ctx);
 188         talloc_free(sam_ctx);
 189         return werr;
 190 }