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 "rpc_server/dcerpc_server.h"
  24 #include "dsdb/samdb/samdb.h"
  25 #include "rpc_server/drsuapi/dcesrv_drsuapi.h"
  26 #include "libcli/security/security.h"
  27 #include "auth/session.h"
  28 #include "librpc/gen_ndr/ndr_drsuapi.h"
  29
  30 struct repsTo {
  31         uint32_t count;
  32         struct repsFromToBlob *r;
  33 };
  34
  35 /*
  36   add a replication destination for a given partition GUID
  37  */
  38 static WERROR uref_add_dest(struct ldb_context *sam_ctx, TALLOC_CTX *mem_ctx,
  39                             struct ldb_dn *dn, struct repsFromTo1 *dest,
  40                             uint32_t options)
  41 {
  42         struct repsTo reps;
  43         WERROR werr;
  44         unsigned int i;
  45
  46         werr = dsdb_loadreps(sam_ctx, mem_ctx, dn, "repsTo", &reps.r, &reps.count);
  47         if (!W_ERROR_IS_OK(werr)) {
  48                 return werr;
  49         }
  50
  51         for (i=0; i<reps.count; i++) {
  52                 if (GUID_compare(&dest->source_dsa_obj_guid,
  53                                  &reps.r[i].ctr.ctr1.source_dsa_obj_guid) == 0) {
  54                         if (options & DRSUAPI_DRS_GETCHG_CHECK) {
  55                                 return WERR_OK;
  56                         } else {
  57                                 return WERR_DS_DRA_REF_ALREADY_EXISTS;
  58                         }
  59                 }
  60         }
  61
  62         reps.r = talloc_realloc(mem_ctx, reps.r, struct repsFromToBlob, reps.count+1);
  63         if (reps.r == NULL) {
  64                 return WERR_DS_DRA_INTERNAL_ERROR;
  65         }
  66         ZERO_STRUCT(reps.r[reps.count]);
  67         reps.r[reps.count].version = 1;
  68         reps.r[reps.count].ctr.ctr1 = *dest;
  69         /* add the GCSPN flag if the client asked for it */
  70         reps.r[reps.count].ctr.ctr1.replica_flags |= (options & DRSUAPI_DRS_REF_GCSPN);
  71         reps.count++;
  72
  73         werr = dsdb_savereps(sam_ctx, mem_ctx, dn, "repsTo", reps.r, reps.count);
  74         if (!W_ERROR_IS_OK(werr)) {
  75                 return werr;
  76         }
  77
  78         return WERR_OK;
  79 }
  80
  81 /*
  82   delete a replication destination for a given partition GUID
  83  */
  84 static WERROR uref_del_dest(struct ldb_context *sam_ctx, TALLOC_CTX *mem_ctx,
  85                             struct ldb_dn *dn, struct GUID *dest_guid,
  86                             uint32_t options)
  87 {
  88         struct repsTo reps;
  89         WERROR werr;
  90         unsigned int i;
  91         bool found = false;
  92
  93         werr = dsdb_loadreps(sam_ctx, mem_ctx, dn, "repsTo", &reps.r, &reps.count);
  94         if (!W_ERROR_IS_OK(werr)) {
  95                 return werr;
  96         }
  97
  98         for (i=0; i<reps.count; i++) {
  99                 if (GUID_compare(dest_guid, &reps.r[i].ctr.ctr1.source_dsa_obj_guid) == 0) {
 100                         if (i+1 < reps.count) {
 101                                 memmove(&reps.r[i], &reps.r[i+1], sizeof(reps.r[i])*(reps.count-(i+1)));
 102                         }
 103                         reps.count--;
 104                         found = true;
 105                 }
 106         }
 107
 108         werr = dsdb_savereps(sam_ctx, mem_ctx, dn, "repsTo", reps.r, reps.count);
 109         if (!W_ERROR_IS_OK(werr)) {
 110                 return werr;
 111         }
 112
 113         if (!found &&
 114             !(options & DRSUAPI_DRS_GETCHG_CHECK) &&
 115             !(options & DRSUAPI_DRS_ADD_REF)) {
 116                 return WERR_DS_DRA_REF_NOT_FOUND;
 117         }
 118
 119         return WERR_OK;
 120 }
 121
 122 /*
 123   drsuapi_DsReplicaUpdateRefs - a non RPC version callable from getncchanges
 124 */
 125 WERROR drsuapi_UpdateRefs(struct drsuapi_bind_state *b_state, TALLOC_CTX *mem_ctx,
 126                           struct drsuapi_DsReplicaUpdateRefsRequest1 *req)
 127 {
 128         WERROR werr;
 129         struct ldb_dn *dn;
 130         struct ldb_context *sam_ctx = b_state->sam_ctx_system?b_state->sam_ctx_system:b_state->sam_ctx;
 131
 132         DEBUG(4,("DsReplicaUpdateRefs for host '%s' with GUID %s options 0x%08x nc=%s\n",
 133                  req->dest_dsa_dns_name, GUID_string(mem_ctx, &req->dest_dsa_guid),
 134                  req->options,
 135                  drs_ObjectIdentifier_to_string(mem_ctx, req->naming_context)));
 136
 137         dn = ldb_dn_new(mem_ctx, sam_ctx, req->naming_context->dn);
 138         if (dn == NULL) {
 139                 return WERR_DS_INVALID_DN_SYNTAX;
 140         }
 141
 142         if (ldb_transaction_start(sam_ctx) != LDB_SUCCESS) {
 143                 DEBUG(0,(__location__ ": Failed to start transaction on samdb: %s\n",
 144                          ldb_errstring(sam_ctx)));
 145                 return WERR_DS_DRA_INTERNAL_ERROR;
 146         }
 147
 148         if (req->options & DRSUAPI_DRS_DEL_REF) {
 149                 werr = uref_del_dest(sam_ctx, mem_ctx, dn, &req->dest_dsa_guid, req->options);
 150                 if (!W_ERROR_IS_OK(werr)) {
 151                         DEBUG(0,("Failed to delete repsTo for %s: %s\n",
 152                                  GUID_string(mem_ctx, &req->dest_dsa_guid),
 153                                  win_errstr(werr)));
 154                         goto failed;
 155                 }
 156         }
 157
 158         if (req->options & DRSUAPI_DRS_ADD_REF) {
 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, req->options);
 171                 if (!W_ERROR_IS_OK(werr)) {
 172                         DEBUG(0,("Failed to add repsTo for %s: %s\n",
 173                                  GUID_string(mem_ctx, &dest.source_dsa_obj_guid),
 174                                  win_errstr(werr)));
 175                         goto failed;
 176                 }
 177         }
 178
 179         if (ldb_transaction_commit(sam_ctx) != LDB_SUCCESS) {
 180                 DEBUG(0,(__location__ ": Failed to commit transaction on samdb: %s\n",
 181                          ldb_errstring(sam_ctx)));
 182                 return WERR_DS_DRA_INTERNAL_ERROR;
 183         }
 184
 185         return WERR_OK;
 186
 187 failed:
 188         ldb_transaction_cancel(sam_ctx);
 189         return werr;
 190 }
 191
 192 /*
 193   drsuapi_DsReplicaUpdateRefs
 194 */
 195 WERROR dcesrv_drsuapi_DsReplicaUpdateRefs(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx,
 196                                           struct drsuapi_DsReplicaUpdateRefs *r)
 197 {
 198         struct dcesrv_handle *h;
 199         struct drsuapi_bind_state *b_state;
 200         struct drsuapi_DsReplicaUpdateRefsRequest1 *req;
 201         WERROR werr;
 202         int ret;
 203         enum security_user_level security_level;
 204
 205         DCESRV_PULL_HANDLE_WERR(h, r->in.bind_handle, DRSUAPI_BIND_HANDLE);
 206         b_state = h->data;
 207
 208         if (r->in.level != 1) {
 209                 DEBUG(0,("DrReplicUpdateRefs - unsupported level %u\n", r->in.level));
 210                 return WERR_DS_DRA_INVALID_PARAMETER;
 211         }
 212         req = &r->in.req.req1;
 213         werr = drs_security_access_check(b_state->sam_ctx,
 214                                          mem_ctx,
 215                                          dce_call->conn->auth_state.session_info->security_token,
 216                                          req->naming_context,
 217                                          GUID_DRS_MANAGE_TOPOLOGY);
 218
 219         if (!W_ERROR_IS_OK(werr)) {
 220                 return werr;
 221         }
 222
 223         security_level = security_session_user_level(dce_call->conn->auth_state.session_info, NULL);
 224         if (security_level < SECURITY_ADMINISTRATOR) {
 225                 /* check that they are using an DSA objectGUID that they own */
 226                 ret = dsdb_validate_dsa_guid(b_state->sam_ctx,
 227                                              &req->dest_dsa_guid,
 228                                              &dce_call->conn->auth_state.session_info->security_token->sids[PRIMARY_USER_SID_INDEX]);
 229                 if (ret != LDB_SUCCESS) {
 230                         DEBUG(0,(__location__ ": Refusing DsReplicaUpdateRefs for sid %s with GUID %s\n",
 231                                  dom_sid_string(mem_ctx,
 232                                                 &dce_call->conn->auth_state.session_info->security_token->sids[PRIMARY_USER_SID_INDEX]),
 233                                  GUID_string(mem_ctx, &req->dest_dsa_guid)));
 234                         return WERR_DS_DRA_ACCESS_DENIED;
 235                 }
 236         }
 237
 238         werr = drsuapi_UpdateRefs(b_state, mem_ctx, req);
 239
 240 #if 0
 241         NDR_PRINT_FUNCTION_DEBUG(drsuapi_DsReplicaUpdateRefs, NDR_BOTH, r);
 242 #endif
 243
 244         return werr;
 245 }