source4/rpc_server/drsuapi/getncchanges.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    implement the DRSUpdateRefs call
   5
   6    Copyright (C) Anatoliy Atanasov 2009
   7    Copyright (C) Andrew Tridgell 2009
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "rpc_server/dcerpc_server.h"
  25 #include "dsdb/samdb/samdb.h"
  26 #include "param/param.h"
  27 #include "librpc/gen_ndr/ndr_drsblobs.h"
  28 #include "rpc_server/drsuapi/dcesrv_drsuapi.h"
  29 #include "rpc_server/dcerpc_server_proto.h"
  30 #include "../libcli/drsuapi/drsuapi.h"
  31 #include "libcli/security/security.h"
  32
  33 /*
  34   drsuapi_DsGetNCChanges for one object
  35 */
  36 static WERROR get_nc_changes_build_object(struct drsuapi_DsReplicaObjectListItemEx *obj,
  37                                           struct ldb_message *msg,
  38                                           struct ldb_context *sam_ctx,
  39                                           struct ldb_dn *ncRoot_dn,
  40                                           struct dsdb_schema *schema,
  41                                           DATA_BLOB *session_key,
  42                                           uint64_t highest_usn,
  43                                           uint32_t replica_flags)
  44 {
  45         const struct ldb_val *md_value;
  46         int i, n;
  47         struct ldb_dn *obj_dn;
  48         struct replPropertyMetaDataBlob md;
  49         struct dom_sid *sid;
  50         uint32_t rid = 0;
  51         enum ndr_err_code ndr_err;
  52         uint32_t *attids;
  53         const char *rdn;
  54         const struct dsdb_attribute *rdn_sa;
  55
  56         if (ldb_dn_compare(ncRoot_dn, msg->dn) == 0) {
  57                 obj->is_nc_prefix = true;
  58                 obj->parent_object_guid = NULL;
  59         } else {
  60                 struct ldb_dn *parent_dn;
  61                 uint32_t instance_type;
  62
  63                 instance_type = ldb_msg_find_attr_as_uint(msg, "instanceType", 0);
  64                 if (instance_type & INSTANCE_TYPE_IS_NC_HEAD) {
  65                         struct ldb_result *res;
  66                         int ret;
  67                         const char *dnstr = ldb_dn_get_linearized(msg->dn);
  68                         msg->dn = ldb_dn_new(msg, sam_ctx, dnstr);
  69                         /* we need to re-search the msg, to avoid the
  70                          * broken dual message problems with our
  71                          * partitions implementation */
  72                         DEBUG(6,(__location__ ": Re-fetching subref %s\n",
  73                                  ldb_dn_get_linearized(msg->dn)));
  74                         ret = drsuapi_search_with_extended_dn(sam_ctx, msg, &res,
  75                                                               msg->dn, LDB_SCOPE_BASE, NULL,
  76                                                               NULL, NULL);
  77                         if (ret != LDB_SUCCESS || res->count < 1) {
  78                                 DEBUG(0,(__location__ ": Failed to reload subref head %s in %s\n",
  79                                          ldb_dn_get_linearized(msg->dn), ldb_dn_get_linearized(ncRoot_dn)));
  80                                 return WERR_DS_DRA_INTERNAL_ERROR;
  81                         }
  82                         msg = res->msgs[0];
  83                 }
  84
  85                 parent_dn = ldb_dn_copy(msg, msg->dn);
  86                 obj->is_nc_prefix = false;
  87                 obj->parent_object_guid = talloc(obj, struct GUID);
  88                 if (parent_dn == NULL) {
  89                         return WERR_DS_DRA_INTERNAL_ERROR;
  90                 }
  91                 if (ldb_dn_remove_child_components(parent_dn, 1) != true) {
  92                         DEBUG(0,(__location__ ": Unable to remove DN component\n"));
  93                         return WERR_DS_DRA_INTERNAL_ERROR;
  94                 }
  95                 if (dsdb_find_guid_by_dn(sam_ctx, parent_dn, obj->parent_object_guid) != LDB_SUCCESS) {
  96                         DEBUG(0,(__location__ ": Unable to find parent DN %s %s\n",
  97                                  ldb_dn_get_linearized(msg->dn), ldb_dn_get_linearized(parent_dn)));
  98                 }
  99                 talloc_free(parent_dn);
 100         }
 101         obj->next_object = NULL;
 102
 103         md_value = ldb_msg_find_ldb_val(msg, "replPropertyMetaData");
 104         if (!md_value) {
 105                 /* nothing to send */
 106                 return WERR_OK;
 107         }
 108
 109         ndr_err = ndr_pull_struct_blob(md_value, obj,
 110                                        lp_iconv_convenience(ldb_get_opaque(sam_ctx, "loadparm")), &md,
 111                                        (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
 112         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 113                 return WERR_DS_DRA_INTERNAL_ERROR;
 114         }
 115
 116         if (md.version != 1) {
 117                 return WERR_DS_DRA_INTERNAL_ERROR;
 118         }
 119
 120         rdn = ldb_dn_get_rdn_name(msg->dn);
 121         if (rdn == NULL) {
 122                 DEBUG(0,(__location__ ": No rDN for %s\n", ldb_dn_get_linearized(msg->dn)));
 123                 return WERR_DS_DRA_INTERNAL_ERROR;
 124         }
 125
 126         rdn_sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn);
 127         if (rdn_sa == NULL) {
 128                 DEBUG(0,(__location__ ": Can't find dsds_attribute for rDN %s in %s\n",
 129                          rdn, ldb_dn_get_linearized(msg->dn)));
 130                 return WERR_DS_DRA_INTERNAL_ERROR;
 131         }
 132
 133         obj->meta_data_ctr = talloc(obj, struct drsuapi_DsReplicaMetaDataCtr);
 134         attids = talloc_array(obj, uint32_t, md.ctr.ctr1.count);
 135
 136         obj->meta_data_ctr->meta_data = talloc_array(obj, struct drsuapi_DsReplicaMetaData, md.ctr.ctr1.count);
 137         for (n=i=0; i<md.ctr.ctr1.count; i++) {
 138                 /* if the attribute has not changed, and it is not the
 139                    instanceType then don't include it */
 140                 if (md.ctr.ctr1.array[i].local_usn < highest_usn &&
 141                     md.ctr.ctr1.array[i].attid != DRSUAPI_ATTRIBUTE_instanceType) continue;
 142
 143                 /* don't include the rDN */
 144                 if (md.ctr.ctr1.array[i].attid == rdn_sa->attributeID_id) continue;
 145
 146                 obj->meta_data_ctr->meta_data[n].originating_change_time = md.ctr.ctr1.array[i].originating_change_time;
 147                 obj->meta_data_ctr->meta_data[n].version = md.ctr.ctr1.array[i].version;
 148                 obj->meta_data_ctr->meta_data[n].originating_invocation_id = md.ctr.ctr1.array[i].originating_invocation_id;
 149                 obj->meta_data_ctr->meta_data[n].originating_usn = md.ctr.ctr1.array[i].originating_usn;
 150                 attids[n] = md.ctr.ctr1.array[i].attid;
 151                 n++;
 152         }
 153
 154         /*
 155           note that if n==0 we still need to send the change, as it
 156           could be a rename, which changes the uSNChanged, but not any
 157           of the replicated attributes
 158          */
 159
 160         obj->meta_data_ctr->count = n;
 161
 162         obj->object.identifier = talloc(obj, struct drsuapi_DsReplicaObjectIdentifier);
 163         obj_dn = ldb_msg_find_attr_as_dn(sam_ctx, obj, msg, "distinguishedName");
 164         obj->object.identifier->dn = ldb_dn_get_linearized(obj_dn);
 165         obj->object.identifier->guid = samdb_result_guid(msg, "objectGUID");
 166         sid = samdb_result_dom_sid(obj, msg, "objectSid");
 167         if (sid) {
 168                 dom_sid_split_rid(NULL, sid, NULL, &rid);
 169                 obj->object.identifier->sid = *sid;
 170         } else {
 171                 ZERO_STRUCT(obj->object.identifier->sid);
 172         }
 173
 174         obj->object.flags = DRSUAPI_DS_REPLICA_OBJECT_FROM_MASTER;
 175         obj->object.attribute_ctr.num_attributes = obj->meta_data_ctr->count;
 176         obj->object.attribute_ctr.attributes = talloc_array(obj, struct drsuapi_DsReplicaAttribute,
 177                                                             obj->object.attribute_ctr.num_attributes);
 178
 179         /*
 180          * Note that the meta_data array and the attributes array must
 181          * be the same size and in the same order
 182          */
 183         for (i=0; i<obj->object.attribute_ctr.num_attributes; i++) {
 184                 struct ldb_message_element *el;
 185                 WERROR werr;
 186                 const struct dsdb_attribute *sa;
 187
 188                 sa = dsdb_attribute_by_attributeID_id(schema, attids[i]);
 189                 if (!sa) {
 190                         DEBUG(0,("Unable to find attributeID %u in schema\n", attids[i]));
 191                         return WERR_DS_DRA_INTERNAL_ERROR;
 192                 }
 193
 194                 el = ldb_msg_find_element(msg, sa->lDAPDisplayName);
 195                 if (el == NULL) {
 196                         DEBUG(0,("No element '%s' for attributeID %u in message\n",
 197                                  sa->lDAPDisplayName, attids[i]));
 198                         ZERO_STRUCT(obj->object.attribute_ctr.attributes[i]);
 199                         obj->object.attribute_ctr.attributes[i].attid = attids[i];
 200                 } else {
 201                         werr = dsdb_attribute_ldb_to_drsuapi(sam_ctx, schema, el, obj,
 202                                                              &obj->object.attribute_ctr.attributes[i]);
 203                         if (!W_ERROR_IS_OK(werr)) {
 204                                 DEBUG(0,("Unable to convert %s to DRS object - %s\n",
 205                                          sa->lDAPDisplayName, win_errstr(werr)));
 206                                 return werr;
 207                         }
 208                         /* if DRSUAPI_DRS_SPECIAL_SECRET_PROCESSING is set
 209                          * check if attribute is secret and send a null value
 210                          */
 211                         if (replica_flags & DRSUAPI_DRS_SPECIAL_SECRET_PROCESSING) {
 212                                 drsuapi_process_secret_attribute(&obj->object.attribute_ctr.attributes[i],
 213                                                                  &obj->meta_data_ctr->meta_data[i]);
 214                         }
 215                         /* some attributes needs to be encrypted
 216                            before being sent */
 217                         werr = drsuapi_encrypt_attribute(obj, session_key, rid,
 218                                                          &obj->object.attribute_ctr.attributes[i]);
 219                         if (!W_ERROR_IS_OK(werr)) {
 220                                 DEBUG(0,("Unable to encrypt %s in DRS object - %s\n",
 221                                          sa->lDAPDisplayName, win_errstr(werr)));
 222                                 return werr;
 223                         }
 224                 }
 225         }
 226
 227         return WERR_OK;
 228 }
 229
 230 /*
 231   load replUpToDateVector from a DN
 232  */
 233 static WERROR load_udv(struct ldb_context *sam_ctx, TALLOC_CTX *mem_ctx,
 234                        struct ldb_dn *dn, struct replUpToDateVectorBlob *ouv)
 235 {
 236         const char *attrs[] = { "replUpToDateVector", NULL };
 237         struct ldb_result *res = NULL;
 238         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 239         struct ldb_message_element *el;
 240         enum ndr_err_code ndr_err;
 241
 242         ZERO_STRUCTP(ouv);
 243
 244         if (ldb_search(sam_ctx, tmp_ctx, &res, dn, LDB_SCOPE_BASE, attrs, NULL) != LDB_SUCCESS ||
 245             res->count < 1) {
 246                 DEBUG(0,("load_udv: failed to read partition object\n"));
 247                 talloc_free(tmp_ctx);
 248                 return WERR_DS_DRA_INTERNAL_ERROR;
 249         }
 250
 251         el = ldb_msg_find_element(res->msgs[0], "replUpToDateVector");
 252         if (el == NULL || el->num_values < 1) {
 253                 talloc_free(tmp_ctx);
 254                 ouv->version = 2;
 255                 return WERR_OK;
 256         }
 257
 258         ndr_err = ndr_pull_struct_blob(&el->values[0],
 259                                        mem_ctx, lp_iconv_convenience(ldb_get_opaque(sam_ctx, "loadparm")),
 260                                        ouv,
 261                                        (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
 262         talloc_free(tmp_ctx);
 263         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 264                 DEBUG(0,(__location__ ": Failed to parse replUpToDateVector for %s\n",
 265                          ldb_dn_get_linearized(dn)));
 266                 return WERR_DS_DRA_INTERNAL_ERROR;
 267         }
 268
 269         return WERR_OK;
 270
 271 }
 272
 273 /*
 274   fill in the cursors return based on the replUpToDateVector for the ncRoot_dn
 275  */
 276 static WERROR get_nc_changes_udv(struct ldb_context *sam_ctx,
 277                                  struct ldb_dn *ncRoot_dn,
 278                                  struct drsuapi_DsReplicaCursor2CtrEx *udv)
 279 {
 280         WERROR werr;
 281         struct drsuapi_DsReplicaCursor2 *tmp_cursor;
 282         uint64_t highest_commited_usn;
 283         NTTIME now;
 284         time_t t = time(NULL);
 285         int ret;
 286         struct replUpToDateVectorBlob ouv;
 287
 288         werr = load_udv(sam_ctx, udv, ncRoot_dn, &ouv);
 289         if (!W_ERROR_IS_OK(werr)) {
 290                 return werr;
 291         }
 292
 293         ret = ldb_sequence_number(sam_ctx, LDB_SEQ_HIGHEST_SEQ, &highest_commited_usn);
 294         if (ret != LDB_SUCCESS) {
 295                 return WERR_DS_DRA_INTERNAL_ERROR;
 296         }
 297
 298         tmp_cursor = talloc(udv, struct drsuapi_DsReplicaCursor2);
 299         tmp_cursor->source_dsa_invocation_id = *(samdb_ntds_invocation_id(sam_ctx));
 300         tmp_cursor->highest_usn = highest_commited_usn;
 301         unix_to_nt_time(&now, t);
 302         tmp_cursor->last_sync_success = now;
 303
 304         udv->count = ouv.ctr.ctr2.count + 1;
 305         udv->cursors = talloc_steal(udv, ouv.ctr.ctr2.cursors);
 306         udv->cursors = talloc_realloc(udv, udv->cursors, struct drsuapi_DsReplicaCursor2, udv->count);
 307         if (!udv->cursors) {
 308                 return WERR_DS_DRA_INTERNAL_ERROR;
 309         }
 310         udv->cursors[udv->count - 1] = *tmp_cursor;
 311
 312         qsort(udv->cursors, udv->count,
 313               sizeof(struct drsuapi_DsReplicaCursor2),
 314               (comparison_fn_t)drsuapi_DsReplicaCursor2_compare);
 315
 316         return WERR_OK;
 317 }
 318
 319 /* state of a partially completed getncchanges call */
 320 struct drsuapi_getncchanges_state {
 321         struct ldb_result *site_res;
 322         uint32_t num_sent;
 323         struct ldb_dn *ncRoot_dn;
 324         uint32_t min_usn;
 325 };
 326
 327 /*
 328   drsuapi_DsGetNCChanges
 329
 330   see MS-DRSR 4.1.10.5.2 for basic logic of this function
 331 */
 332 WERROR dcesrv_drsuapi_DsGetNCChanges(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx,
 333                                      struct drsuapi_DsGetNCChanges *r)
 334 {
 335         struct drsuapi_DsReplicaObjectIdentifier *ncRoot;
 336         int ret;
 337         int i;
 338         struct dsdb_schema *schema;
 339         struct drsuapi_DsReplicaOIDMapping_Ctr *ctr;
 340         struct drsuapi_DsReplicaObjectListItemEx **currentObject;
 341         NTSTATUS status;
 342         DATA_BLOB session_key;
 343         const char *attrs[] = { "*", "distinguishedName", "ntSecurityDescriptor", NULL };
 344         WERROR werr;
 345         struct dcesrv_handle *h;
 346         struct drsuapi_bind_state *b_state;
 347         struct drsuapi_getncchanges_state *getnc_state;
 348         struct drsuapi_DsGetNCChangesRequest8 *req8;
 349         uint32_t options;
 350
 351         DCESRV_PULL_HANDLE_WERR(h, r->in.bind_handle, DRSUAPI_BIND_HANDLE);
 352         b_state = h->data;
 353
 354         *r->out.level_out = 6;
 355         /* TODO: linked attributes*/
 356         r->out.ctr->ctr6.linked_attributes_count = 0;
 357         r->out.ctr->ctr6.linked_attributes = NULL;
 358
 359         r->out.ctr->ctr6.object_count = 0;
 360         r->out.ctr->ctr6.nc_object_count = 0;
 361         r->out.ctr->ctr6.more_data = false;
 362         r->out.ctr->ctr6.uptodateness_vector = NULL;
 363
 364         /* a RODC doesn't allow for any replication */
 365         if (samdb_rodc(ldb_get_opaque(b_state->sam_ctx, "loadparm"))) {
 366                 DEBUG(0,(__location__ ": DsGetNCChanges attempt on RODC\n"));
 367                 return WERR_DS_DRA_SOURCE_DISABLED;
 368         }
 369
 370         /* Check request revision.
 371            TODO: Adding mappings to req8 from the other levels
 372          */
 373         if (r->in.level != 8) {
 374                 DEBUG(0,(__location__ ": Request for DsGetNCChanges with unsupported level %u\n",
 375                          r->in.level));
 376                 return WERR_REVISION_MISMATCH;
 377         }
 378
 379         req8 = &r->in.req->req8;
 380
 381         /* Perform access checks. */
 382         ncRoot = req8->naming_context;
 383         if (ncRoot == NULL) {
 384                 DEBUG(0,(__location__ ": Request for DsGetNCChanges with no NC\n"));
 385                 return WERR_DS_DRA_INVALID_PARAMETER;
 386         }
 387
 388         if (samdb_ntds_options(b_state->sam_ctx, &options) != LDB_SUCCESS) {
 389                 return WERR_DS_DRA_INTERNAL_ERROR;
 390         }
 391
 392         if ((options & DS_NTDSDSA_OPT_DISABLE_OUTBOUND_REPL) &&
 393             !(req8->replica_flags & DRSUAPI_DRS_SYNC_FORCED)) {
 394                 return WERR_DS_DRA_SOURCE_DISABLED;
 395         }
 396
 397
 398         if (req8->replica_flags & DRSUAPI_DS_REPLICA_NEIGHBOUR_FULL_SYNC_PACKET) {
 399                 /* Ignore the _in_ uptpdateness vector*/
 400                 req8->uptodateness_vector = NULL;
 401         }
 402
 403         werr = drs_security_level_check(dce_call, "DsGetNCChanges");
 404         if (!W_ERROR_IS_OK(werr)) {
 405                 return werr;
 406         }
 407
 408         getnc_state = b_state->getncchanges_state;
 409         if (getnc_state == NULL) {
 410                 getnc_state = talloc_zero(b_state, struct drsuapi_getncchanges_state);
 411                 if (getnc_state == NULL) {
 412                         return WERR_NOMEM;
 413                 }
 414                 b_state->getncchanges_state = getnc_state;
 415         }
 416
 417         /* we need the session key for encrypting password attributes */
 418         status = dcesrv_inherited_session_key(dce_call->conn, &session_key);
 419         if (!NT_STATUS_IS_OK(status)) {
 420                 DEBUG(0,(__location__ ": Failed to get session key\n"));
 421                 return WERR_DS_DRA_INTERNAL_ERROR;
 422         }
 423
 424         /* we don't yet support extended operations */
 425         if (req8->extended_op != DRSUAPI_EXOP_NONE) {
 426                 DEBUG(0,(__location__ ": Request for DsGetNCChanges extended op 0x%x\n",
 427                          (unsigned)req8->extended_op));
 428                 return WERR_DS_DRA_NOT_SUPPORTED;
 429         }
 430
 431         /*
 432            TODO: MS-DRSR section 4.1.10.1.1
 433            Work out if this is the start of a new cycle */
 434
 435         if (getnc_state->site_res == NULL) {
 436                 char* search_filter;
 437                 enum ldb_scope scope = LDB_SCOPE_SUBTREE;
 438
 439                 getnc_state->min_usn = req8->highwatermark.highest_usn;
 440
 441                 /* Construct response. */
 442                 search_filter = talloc_asprintf(mem_ctx,
 443                                                 "(uSNChanged>=%llu)",
 444                                                 (unsigned long long)(getnc_state->min_usn+1));
 445
 446                 if (req8->replica_flags & DRSUAPI_DS_REPLICA_NEIGHBOUR_CRITICAL_ONLY) {
 447                         search_filter = talloc_asprintf(mem_ctx,
 448                                                         "(&%s(isCriticalSystemObject=TRUE))",
 449                                                         search_filter);
 450                 }
 451
 452                 getnc_state->ncRoot_dn = ldb_dn_new(getnc_state, b_state->sam_ctx, ncRoot->dn);
 453                 if (req8->replica_flags & DRSUAPI_DS_REPLICA_NEIGHBOUR_ASYNC_REP) {
 454                         scope = LDB_SCOPE_BASE;
 455                 }
 456
 457                 DEBUG(6,(__location__ ": getncchanges on %s using filter %s\n",
 458                          ldb_dn_get_linearized(getnc_state->ncRoot_dn), search_filter));
 459                 ret = drsuapi_search_with_extended_dn(b_state->sam_ctx, getnc_state, &getnc_state->site_res,
 460                                                       getnc_state->ncRoot_dn, scope, attrs,
 461                                                       "uSNChanged",
 462                                                       search_filter);
 463                 if (ret != LDB_SUCCESS) {
 464                         return WERR_DS_DRA_INTERNAL_ERROR;
 465                 }
 466         } else {
 467                 /* check that this request is for the same NC as the previous one */
 468                 struct ldb_dn *dn;
 469                 dn = ldb_dn_new(getnc_state, b_state->sam_ctx, ncRoot->dn);
 470                 if (!dn) {
 471                         return WERR_NOMEM;
 472                 }
 473                 if (ldb_dn_compare(dn, getnc_state->ncRoot_dn) != 0) {
 474                         DEBUG(0,(__location__ ": DsGetNCChanges 2nd replication on different DN %s %s\n",
 475                                  ldb_dn_get_linearized(dn),
 476                                  ldb_dn_get_linearized(getnc_state->ncRoot_dn)));
 477                         return WERR_DS_DRA_BAD_NC;
 478                 }
 479         }
 480
 481         /* Prefix mapping */
 482         schema = dsdb_get_schema(b_state->sam_ctx);
 483         if (!schema) {
 484                 DEBUG(0,("No schema in sam_ctx\n"));
 485                 return WERR_DS_DRA_INTERNAL_ERROR;
 486         }
 487
 488         r->out.ctr->ctr6.naming_context = talloc(mem_ctx, struct drsuapi_DsReplicaObjectIdentifier);
 489         *r->out.ctr->ctr6.naming_context = *ncRoot;
 490
 491         if (dsdb_find_guid_by_dn(b_state->sam_ctx, getnc_state->ncRoot_dn,
 492                                  &r->out.ctr->ctr6.naming_context->guid) != LDB_SUCCESS) {
 493                 DEBUG(0,(__location__ ": Failed to find GUID of ncRoot_dn %s\n",
 494                          ldb_dn_get_linearized(getnc_state->ncRoot_dn)));
 495                 return WERR_DS_DRA_INTERNAL_ERROR;
 496         }
 497
 498         /* find the SID if there is one */
 499         dsdb_find_sid_by_dn(b_state->sam_ctx, getnc_state->ncRoot_dn, &r->out.ctr->ctr6.naming_context->sid);
 500
 501         dsdb_get_oid_mappings_drsuapi(schema, true, mem_ctx, &ctr);
 502         r->out.ctr->ctr6.mapping_ctr = *ctr;
 503
 504         r->out.ctr->ctr6.source_dsa_guid = *(samdb_ntds_objectGUID(b_state->sam_ctx));
 505         r->out.ctr->ctr6.source_dsa_invocation_id = *(samdb_ntds_invocation_id(b_state->sam_ctx));
 506
 507         r->out.ctr->ctr6.old_highwatermark = req8->highwatermark;
 508         r->out.ctr->ctr6.new_highwatermark = req8->highwatermark;
 509
 510         r->out.ctr->ctr6.first_object = NULL;
 511         currentObject = &r->out.ctr->ctr6.first_object;
 512
 513         for(i=getnc_state->num_sent;
 514             i<getnc_state->site_res->count &&
 515                     (r->out.ctr->ctr6.object_count < req8->max_object_count);
 516             i++) {
 517                 int uSN;
 518                 struct drsuapi_DsReplicaObjectListItemEx *obj;
 519                 obj = talloc_zero(mem_ctx, struct drsuapi_DsReplicaObjectListItemEx);
 520
 521                 uSN = ldb_msg_find_attr_as_int(getnc_state->site_res->msgs[i], "uSNChanged", -1);
 522                 if (uSN > r->out.ctr->ctr6.new_highwatermark.tmp_highest_usn) {
 523                         r->out.ctr->ctr6.new_highwatermark.tmp_highest_usn = uSN;
 524                 }
 525
 526                 werr = get_nc_changes_build_object(obj, getnc_state->site_res->msgs[i],
 527                                                    b_state->sam_ctx, getnc_state->ncRoot_dn,
 528                                                    schema, &session_key, getnc_state->min_usn,
 529                                                    req8->replica_flags);
 530                 if (!W_ERROR_IS_OK(werr)) {
 531                         return werr;
 532                 }
 533
 534                 if (obj->meta_data_ctr == NULL) {
 535                         DEBUG(0,(__location__ ": getncchanges skipping send of object %s\n",
 536                                  ldb_dn_get_linearized(getnc_state->site_res->msgs[i]->dn)));
 537                         /* no attributes to send */
 538                         talloc_free(obj);
 539                         continue;
 540                 }
 541
 542                 r->out.ctr->ctr6.object_count++;
 543
 544                 *currentObject = obj;
 545                 currentObject = &obj->next_object;
 546         }
 547
 548         getnc_state->num_sent += r->out.ctr->ctr6.object_count;
 549
 550         r->out.ctr->ctr6.nc_object_count = getnc_state->site_res->count;
 551
 552         /* the client can us to call UpdateRefs on its behalf to
 553            re-establish monitoring of the NC */
 554         if ((req8->replica_flags & DRSUAPI_DRS_ADD_REF) &&
 555             !GUID_all_zero(&req8->destination_dsa_guid)) {
 556                 struct drsuapi_DsReplicaUpdateRefsRequest1 ureq;
 557                 ureq.naming_context = ncRoot;
 558                 ureq.dest_dsa_dns_name = talloc_asprintf(mem_ctx, "%s._msdcs.%s",
 559                                                          GUID_string(mem_ctx, &req8->destination_dsa_guid),
 560                                                          lp_realm(dce_call->conn->dce_ctx->lp_ctx));
 561                 if (!ureq.dest_dsa_dns_name) {
 562                         return WERR_NOMEM;
 563                 }
 564                 ureq.dest_dsa_guid = req8->destination_dsa_guid;
 565                 ureq.options = DRSUAPI_DS_REPLICA_UPDATE_ADD_REFERENCE |
 566                         DRSUAPI_DS_REPLICA_UPDATE_ASYNCHRONOUS_OPERATION |
 567                         DRSUAPI_DS_REPLICA_UPDATE_GETCHG_CHECK;
 568                 werr = drsuapi_UpdateRefs(b_state, mem_ctx, &ureq);
 569                 if (!W_ERROR_IS_OK(werr)) {
 570                         DEBUG(0,(__location__ ": Failed UpdateRefs in DsGetNCChanges - %s\n",
 571                                  win_errstr(werr)));
 572                 }
 573         }
 574
 575         if (i < getnc_state->site_res->count) {
 576                 r->out.ctr->ctr6.more_data = true;
 577         } else {
 578                 r->out.ctr->ctr6.uptodateness_vector = talloc(mem_ctx, struct drsuapi_DsReplicaCursor2CtrEx);
 579                 r->out.ctr->ctr6.uptodateness_vector->version = 2;
 580                 r->out.ctr->ctr6.uptodateness_vector->reserved1 = 0;
 581                 r->out.ctr->ctr6.uptodateness_vector->reserved2 = 0;
 582
 583                 r->out.ctr->ctr6.new_highwatermark.highest_usn = r->out.ctr->ctr6.new_highwatermark.tmp_highest_usn;
 584
 585                 werr = get_nc_changes_udv(b_state->sam_ctx, getnc_state->ncRoot_dn,
 586                                           r->out.ctr->ctr6.uptodateness_vector);
 587                 if (!W_ERROR_IS_OK(werr)) {
 588                         return werr;
 589                 }
 590
 591                 talloc_free(getnc_state);
 592                 b_state->getncchanges_state = NULL;
 593         }
 594
 595         DEBUG(2,("DsGetNCChanges with uSNChanged >= %llu flags 0x%08x on %s gave %u objects\n",
 596                  (unsigned long long)(req8->highwatermark.highest_usn+1),
 597                  req8->replica_flags,
 598                  ncRoot->dn, r->out.ctr->ctr6.object_count));
 599
 600         return WERR_OK;
 601 }