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 "librpc/gen_ndr/ndr_drsuapi.h"
  29 #include "rpc_server/drsuapi/dcesrv_drsuapi.h"
  30 #include "rpc_server/dcerpc_server_proto.h"
  31 #include "../libcli/drsuapi/drsuapi.h"
  32 #include "libcli/security/security.h"
  33
  34 /*
  35   build a DsReplicaObjectIdentifier from a ldb msg
  36  */
  37 static struct drsuapi_DsReplicaObjectIdentifier *get_object_identifier(TALLOC_CTX *mem_ctx,
  38                                                                        struct ldb_message *msg)
  39 {
  40         struct drsuapi_DsReplicaObjectIdentifier *identifier;
  41         struct dom_sid *sid;
  42
  43         identifier = talloc(mem_ctx, struct drsuapi_DsReplicaObjectIdentifier);
  44         if (identifier == NULL) {
  45                 return NULL;
  46         }
  47
  48         identifier->dn = ldb_dn_alloc_linearized(identifier, msg->dn);
  49         identifier->guid = samdb_result_guid(msg, "objectGUID");
  50
  51         sid = samdb_result_dom_sid(identifier, msg, "objectSid");
  52         if (sid) {
  53                 identifier->sid = *sid;
  54         } else {
  55                 ZERO_STRUCT(identifier->sid);
  56         }
  57         return identifier;
  58 }
  59
  60 /*
  61   drsuapi_DsGetNCChanges for one object
  62 */
  63 static WERROR get_nc_changes_build_object(struct drsuapi_DsReplicaObjectListItemEx *obj,
  64                                           struct ldb_message *msg,
  65                                           struct ldb_context *sam_ctx,
  66                                           struct ldb_dn *ncRoot_dn,
  67                                           struct dsdb_schema *schema,
  68                                           DATA_BLOB *session_key,
  69                                           uint64_t highest_usn,
  70                                           uint32_t replica_flags)
  71 {
  72         const struct ldb_val *md_value;
  73         int i, n;
  74         struct replPropertyMetaDataBlob md;
  75         uint32_t rid = 0;
  76         enum ndr_err_code ndr_err;
  77         uint32_t *attids;
  78         const char *rdn;
  79         const struct dsdb_attribute *rdn_sa;
  80
  81         if (ldb_dn_compare(ncRoot_dn, msg->dn) == 0) {
  82                 obj->is_nc_prefix = true;
  83                 obj->parent_object_guid = NULL;
  84         } else {
  85                 obj->is_nc_prefix = false;
  86                 obj->parent_object_guid = talloc(obj, struct GUID);
  87                 if (obj->parent_object_guid == NULL) {
  88                         return WERR_DS_DRA_INTERNAL_ERROR;
  89                 }
  90                 *obj->parent_object_guid = samdb_result_guid(msg, "parentGUID");
  91                 if (GUID_all_zero(obj->parent_object_guid)) {
  92                         DEBUG(0,(__location__ ": missing parentGUID for %s\n",
  93                                  ldb_dn_get_linearized(msg->dn)));
  94                         return WERR_DS_DRA_INTERNAL_ERROR;
  95                 }
  96         }
  97         obj->next_object = NULL;
  98
  99         md_value = ldb_msg_find_ldb_val(msg, "replPropertyMetaData");
 100         if (!md_value) {
 101                 /* nothing to send */
 102                 return WERR_OK;
 103         }
 104
 105         ndr_err = ndr_pull_struct_blob(md_value, obj,
 106                                        lp_iconv_convenience(ldb_get_opaque(sam_ctx, "loadparm")), &md,
 107                                        (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
 108         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 109                 return WERR_DS_DRA_INTERNAL_ERROR;
 110         }
 111
 112         if (md.version != 1) {
 113                 return WERR_DS_DRA_INTERNAL_ERROR;
 114         }
 115
 116         rdn = ldb_dn_get_rdn_name(msg->dn);
 117         if (rdn == NULL) {
 118                 DEBUG(0,(__location__ ": No rDN for %s\n", ldb_dn_get_linearized(msg->dn)));
 119                 return WERR_DS_DRA_INTERNAL_ERROR;
 120         }
 121
 122         rdn_sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn);
 123         if (rdn_sa == NULL) {
 124                 DEBUG(0,(__location__ ": Can't find dsds_attribute for rDN %s in %s\n",
 125                          rdn, ldb_dn_get_linearized(msg->dn)));
 126                 return WERR_DS_DRA_INTERNAL_ERROR;
 127         }
 128
 129         obj->meta_data_ctr = talloc(obj, struct drsuapi_DsReplicaMetaDataCtr);
 130         attids = talloc_array(obj, uint32_t, md.ctr.ctr1.count);
 131
 132         obj->object.identifier = get_object_identifier(obj, msg);
 133         if (obj->object.identifier == NULL) {
 134                 return WERR_NOMEM;
 135         }
 136         dom_sid_split_rid(NULL, &obj->object.identifier->sid, NULL, &rid);
 137
 138         obj->meta_data_ctr->meta_data = talloc_array(obj, struct drsuapi_DsReplicaMetaData, md.ctr.ctr1.count);
 139         for (n=i=0; i<md.ctr.ctr1.count; i++) {
 140                 const struct dsdb_attribute *sa;
 141                 /* if the attribute has not changed, and it is not the
 142                    instanceType then don't include it */
 143                 if (md.ctr.ctr1.array[i].local_usn < highest_usn &&
 144                     md.ctr.ctr1.array[i].attid != DRSUAPI_ATTRIBUTE_instanceType) continue;
 145
 146                 /* don't include the rDN */
 147                 if (md.ctr.ctr1.array[i].attid == rdn_sa->attributeID_id) continue;
 148
 149                 sa = dsdb_attribute_by_attributeID_id(schema, md.ctr.ctr1.array[i].attid);
 150                 if (sa->linkID) {
 151                         struct ldb_message_element *el;
 152                         el = ldb_msg_find_element(msg, sa->lDAPDisplayName);
 153                         if (el && el->num_values && dsdb_dn_is_upgraded_link_val(&el->values[0])) {
 154                                 /* don't send upgraded links inline */
 155                                 continue;
 156                         }
 157                 }
 158
 159                 obj->meta_data_ctr->meta_data[n].originating_change_time = md.ctr.ctr1.array[i].originating_change_time;
 160                 obj->meta_data_ctr->meta_data[n].version = md.ctr.ctr1.array[i].version;
 161                 obj->meta_data_ctr->meta_data[n].originating_invocation_id = md.ctr.ctr1.array[i].originating_invocation_id;
 162                 obj->meta_data_ctr->meta_data[n].originating_usn = md.ctr.ctr1.array[i].originating_usn;
 163                 attids[n] = md.ctr.ctr1.array[i].attid;
 164                 n++;
 165         }
 166
 167         /*
 168           note that if n==0 we still need to send the change, as it
 169           could be a rename, which changes the uSNChanged, but not any
 170           of the replicated attributes
 171          */
 172
 173         obj->meta_data_ctr->count = n;
 174
 175         obj->object.flags = DRSUAPI_DS_REPLICA_OBJECT_FROM_MASTER;
 176         obj->object.attribute_ctr.num_attributes = obj->meta_data_ctr->count;
 177         obj->object.attribute_ctr.attributes = talloc_array(obj, struct drsuapi_DsReplicaAttribute,
 178                                                             obj->object.attribute_ctr.num_attributes);
 179
 180         /*
 181          * Note that the meta_data array and the attributes array must
 182          * be the same size and in the same order
 183          */
 184         for (i=0; i<obj->object.attribute_ctr.num_attributes; i++) {
 185                 struct ldb_message_element *el;
 186                 WERROR werr;
 187                 const struct dsdb_attribute *sa;
 188
 189                 sa = dsdb_attribute_by_attributeID_id(schema, attids[i]);
 190                 if (!sa) {
 191                         DEBUG(0,("Unable to find attributeID %u in schema\n", attids[i]));
 192                         return WERR_DS_DRA_INTERNAL_ERROR;
 193                 }
 194
 195                 el = ldb_msg_find_element(msg, sa->lDAPDisplayName);
 196                 if (el == NULL) {
 197                         /* this happens for attributes that have been removed */
 198                         DEBUG(5,("No element '%s' for attributeID %u in message\n",
 199                                  sa->lDAPDisplayName, attids[i]));
 200                         ZERO_STRUCT(obj->object.attribute_ctr.attributes[i]);
 201                         obj->object.attribute_ctr.attributes[i].attid = attids[i];
 202                 } else {
 203                         werr = dsdb_attribute_ldb_to_drsuapi(sam_ctx, schema, el, obj,
 204                                                              &obj->object.attribute_ctr.attributes[i]);
 205                         if (!W_ERROR_IS_OK(werr)) {
 206                                 DEBUG(0,("Unable to convert %s to DRS object - %s\n",
 207                                          sa->lDAPDisplayName, win_errstr(werr)));
 208                                 return werr;
 209                         }
 210                         /* if DRSUAPI_DRS_SPECIAL_SECRET_PROCESSING is set
 211                          * check if attribute is secret and send a null value
 212                          */
 213                         if (replica_flags & DRSUAPI_DRS_SPECIAL_SECRET_PROCESSING) {
 214                                 drsuapi_process_secret_attribute(&obj->object.attribute_ctr.attributes[i],
 215                                                                  &obj->meta_data_ctr->meta_data[i]);
 216                         }
 217                         /* some attributes needs to be encrypted
 218                            before being sent */
 219                         werr = drsuapi_encrypt_attribute(obj, session_key, rid,
 220                                                          &obj->object.attribute_ctr.attributes[i]);
 221                         if (!W_ERROR_IS_OK(werr)) {
 222                                 DEBUG(0,("Unable to encrypt %s in DRS object - %s\n",
 223                                          sa->lDAPDisplayName, win_errstr(werr)));
 224                                 return werr;
 225                         }
 226                 }
 227         }
 228
 229         return WERR_OK;
 230 }
 231
 232
 233 /*
 234   add one linked attribute from an object to the list of linked
 235   attributes in a getncchanges request
 236  */
 237 static WERROR get_nc_changes_add_la(TALLOC_CTX *mem_ctx,
 238                                     struct ldb_context *sam_ctx,
 239                                     const struct dsdb_schema *schema,
 240                                     const struct dsdb_attribute *sa,
 241                                     struct ldb_message *msg,
 242                                     struct dsdb_dn *dsdb_dn,
 243                                     struct drsuapi_DsReplicaLinkedAttribute **la_list,
 244                                     uint32_t *la_count)
 245 {
 246         struct drsuapi_DsReplicaLinkedAttribute *la;
 247         bool active;
 248         NTSTATUS status;
 249         struct ldb_message_element val_el;
 250         struct ldb_val v;
 251         WERROR werr;
 252         struct drsuapi_DsReplicaAttribute drs;
 253
 254         (*la_list) = talloc_realloc(mem_ctx, *la_list, struct drsuapi_DsReplicaLinkedAttribute, (*la_count)+1);
 255         W_ERROR_HAVE_NO_MEMORY(*la_list);
 256
 257         la = &(*la_list)[*la_count];
 258
 259         la->identifier = get_object_identifier(*la_list, msg);
 260         W_ERROR_HAVE_NO_MEMORY(la->identifier);
 261
 262         active = ldb_dn_get_extended_component(dsdb_dn->dn, "DELETED")?false:true;
 263
 264         la->attid = sa->attributeID_id;
 265         la->flags = active?DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE:0;
 266
 267         status = dsdb_get_extended_dn_nttime(dsdb_dn->dn, &la->originating_add_time, "RMD_ADDTIME");
 268         if (!NT_STATUS_IS_OK(status)) {
 269                 return ntstatus_to_werror(status);
 270         }
 271         status = dsdb_get_extended_dn_uint32(dsdb_dn->dn, &la->meta_data.version, "RMD_VERSION");
 272         if (!NT_STATUS_IS_OK(status)) {
 273                 return ntstatus_to_werror(status);
 274         }
 275         status = dsdb_get_extended_dn_nttime(dsdb_dn->dn, &la->meta_data.originating_change_time, "RMD_CHANGETIME");
 276         if (!NT_STATUS_IS_OK(status)) {
 277                 return ntstatus_to_werror(status);
 278         }
 279         status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &la->meta_data.originating_invocation_id, "RMD_INVOCID");
 280         if (!NT_STATUS_IS_OK(status)) {
 281                 return ntstatus_to_werror(status);
 282         }
 283         status = dsdb_get_extended_dn_uint64(dsdb_dn->dn, &la->meta_data.originating_usn, "RMD_ORIGINATING_USN");
 284         if (!NT_STATUS_IS_OK(status)) {
 285                 return ntstatus_to_werror(status);
 286         }
 287
 288         /* we need a message_element with just one value in it */
 289         v = data_blob_string_const(dsdb_dn_get_extended_linearized(*la_list, dsdb_dn, 1));
 290
 291         val_el.name = sa->lDAPDisplayName;
 292         val_el.values = &v;
 293         val_el.num_values = 1;
 294
 295         werr = sa->syntax->ldb_to_drsuapi(sam_ctx, schema, sa, &val_el, *la_list, &drs);
 296         W_ERROR_NOT_OK_RETURN(werr);
 297
 298         if (drs.value_ctr.num_values != 1) {
 299                 DEBUG(1,(__location__ ": Failed to build DRS blob for linked attribute %s in %s\n",
 300                          sa->lDAPDisplayName, ldb_dn_get_linearized(msg->dn)));
 301                 return WERR_DS_DRA_INTERNAL_ERROR;
 302         }
 303
 304         la->value.blob = drs.value_ctr.values[0].blob;
 305
 306         (*la_count)++;
 307         return WERR_OK;
 308 }
 309
 310
 311 /*
 312   add linked attributes from an object to the list of linked
 313   attributes in a getncchanges request
 314  */
 315 static WERROR get_nc_changes_add_links(struct ldb_context *sam_ctx,
 316                                        TALLOC_CTX *mem_ctx,
 317                                        struct ldb_dn *ncRoot_dn,
 318                                        struct dsdb_schema *schema,
 319                                        uint64_t highest_usn,
 320                                        uint32_t replica_flags,
 321                                        struct ldb_message *msg,
 322                                        struct drsuapi_DsReplicaLinkedAttribute **la_list,
 323                                        uint32_t *la_count)
 324 {
 325         int i;
 326         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 327         uint64_t uSNChanged = ldb_msg_find_attr_as_int(msg, "uSNChanged", -1);
 328
 329         for (i=0; i<msg->num_elements; i++) {
 330                 struct ldb_message_element *el = &msg->elements[i];
 331                 const struct dsdb_attribute *sa;
 332                 int j;
 333
 334                 sa = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
 335
 336                 if (!sa || sa->linkID == 0 || (sa->linkID & 1)) {
 337                         /* we only want forward links */
 338                         continue;
 339                 }
 340
 341                 if (el->num_values && !dsdb_dn_is_upgraded_link_val(&el->values[0])) {
 342                         /* its an old style link, it will have been
 343                          * sent in the main replication data */
 344                         continue;
 345                 }
 346
 347                 for (j=0; j<el->num_values; j++) {
 348                         struct dsdb_dn *dsdb_dn;
 349                         uint64_t local_usn;
 350                         NTSTATUS status;
 351                         WERROR werr;
 352
 353                         dsdb_dn = dsdb_dn_parse(tmp_ctx, sam_ctx, &el->values[j], sa->syntax->ldap_oid);
 354                         if (dsdb_dn == NULL) {
 355                                 DEBUG(1,(__location__ ": Failed to parse DN for %s in %s\n",
 356                                          el->name, ldb_dn_get_linearized(msg->dn)));
 357                                 talloc_free(tmp_ctx);
 358                                 return WERR_DS_DRA_INTERNAL_ERROR;
 359                         }
 360
 361                         status = dsdb_get_extended_dn_uint64(dsdb_dn->dn, &local_usn, "RMD_LOCAL_USN");
 362                         if (!NT_STATUS_IS_OK(status)) {
 363                                 /* this can happen for attributes
 364                                    given to us with old style meta
 365                                    data */
 366                                 continue;
 367                         }
 368
 369                         if (local_usn > uSNChanged) {
 370                                 DEBUG(1,(__location__ ": uSNChanged less than RMD_LOCAL_USN for %s on %s\n",
 371                                          el->name, ldb_dn_get_linearized(msg->dn)));
 372                                 talloc_free(tmp_ctx);
 373                                 return WERR_DS_DRA_INTERNAL_ERROR;
 374                         }
 375
 376                         if (local_usn < highest_usn) {
 377                                 continue;
 378                         }
 379
 380                         werr = get_nc_changes_add_la(mem_ctx, sam_ctx, schema, sa, msg,
 381                                                      dsdb_dn, la_list, la_count);
 382                         if (!W_ERROR_IS_OK(werr)) {
 383                                 talloc_free(tmp_ctx);
 384                                 return werr;
 385                         }
 386                 }
 387         }
 388
 389         talloc_free(tmp_ctx);
 390         return WERR_OK;
 391 }
 392
 393 /*
 394   load replUpToDateVector from a DN
 395  */
 396 static WERROR load_udv(struct ldb_context *sam_ctx, TALLOC_CTX *mem_ctx,
 397                        struct ldb_dn *dn, struct replUpToDateVectorBlob *ouv)
 398 {
 399         const char *attrs[] = { "replUpToDateVector", NULL };
 400         struct ldb_result *res = NULL;
 401         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 402         struct ldb_message_element *el;
 403         enum ndr_err_code ndr_err;
 404
 405         ZERO_STRUCTP(ouv);
 406
 407         if (ldb_search(sam_ctx, tmp_ctx, &res, dn, LDB_SCOPE_BASE, attrs, NULL) != LDB_SUCCESS ||
 408             res->count < 1) {
 409                 DEBUG(0,("load_udv: failed to read partition object\n"));
 410                 talloc_free(tmp_ctx);
 411                 return WERR_DS_DRA_INTERNAL_ERROR;
 412         }
 413
 414         el = ldb_msg_find_element(res->msgs[0], "replUpToDateVector");
 415         if (el == NULL || el->num_values < 1) {
 416                 talloc_free(tmp_ctx);
 417                 ouv->version = 2;
 418                 return WERR_OK;
 419         }
 420
 421         ndr_err = ndr_pull_struct_blob(&el->values[0],
 422                                        mem_ctx, lp_iconv_convenience(ldb_get_opaque(sam_ctx, "loadparm")),
 423                                        ouv,
 424                                        (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
 425         talloc_free(tmp_ctx);
 426         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 427                 DEBUG(0,(__location__ ": Failed to parse replUpToDateVector for %s\n",
 428                          ldb_dn_get_linearized(dn)));
 429                 return WERR_DS_DRA_INTERNAL_ERROR;
 430         }
 431
 432         return WERR_OK;
 433
 434 }
 435
 436 /*
 437   fill in the cursors return based on the replUpToDateVector for the ncRoot_dn
 438  */
 439 static WERROR get_nc_changes_udv(struct ldb_context *sam_ctx,
 440                                  struct ldb_dn *ncRoot_dn,
 441                                  struct drsuapi_DsReplicaCursor2CtrEx *udv,
 442                                  uint64_t highestUSN)
 443 {
 444         WERROR werr;
 445         struct drsuapi_DsReplicaCursor2 *tmp_cursor;
 446         NTTIME now;
 447         time_t t = time(NULL);
 448         struct replUpToDateVectorBlob ouv;
 449         int i;
 450
 451         werr = load_udv(sam_ctx, udv, ncRoot_dn, &ouv);
 452         if (!W_ERROR_IS_OK(werr)) {
 453                 return werr;
 454         }
 455
 456         tmp_cursor = talloc(udv, struct drsuapi_DsReplicaCursor2);
 457         tmp_cursor->source_dsa_invocation_id = *(samdb_ntds_invocation_id(sam_ctx));
 458         tmp_cursor->highest_usn = highestUSN;
 459         unix_to_nt_time(&now, t);
 460         tmp_cursor->last_sync_success = now;
 461
 462         udv->count = ouv.ctr.ctr2.count;
 463         udv->cursors = talloc_steal(udv, ouv.ctr.ctr2.cursors);
 464
 465         for (i=0; i<udv->count; i++) {
 466                 if (GUID_equal(&tmp_cursor->source_dsa_invocation_id,
 467                                &udv->cursors[i].source_dsa_invocation_id)) {
 468                         udv->cursors[i] = *tmp_cursor;
 469                         break;
 470                 }
 471         }
 472         if (i == udv->count) {
 473                 udv->cursors = talloc_realloc(udv, udv->cursors, struct drsuapi_DsReplicaCursor2, udv->count+1);
 474                 if (!udv->cursors) {
 475                         return WERR_DS_DRA_INTERNAL_ERROR;
 476                 }
 477                 udv->cursors[udv->count] = *tmp_cursor;
 478                 udv->count++;
 479         }
 480
 481         qsort(udv->cursors, udv->count,
 482               sizeof(struct drsuapi_DsReplicaCursor2),
 483               (comparison_fn_t)drsuapi_DsReplicaCursor2_compare);
 484
 485         return WERR_OK;
 486 }
 487
 488 /*
 489   sort the objects we send by tree order
 490  */
 491 static int site_res_cmp_parent_order(const struct ldb_message **m1, const struct ldb_message **m2)
 492 {
 493         return ldb_dn_compare((*m2)->dn, (*m1)->dn);
 494 }
 495
 496 /*
 497   sort the objects we send first by uSNChanged
 498  */
 499 static int site_res_cmp_usn_order(const struct ldb_message **m1, const struct ldb_message **m2)
 500 {
 501         unsigned usnchanged1, usnchanged2;
 502         unsigned cn1, cn2;
 503         cn1 = ldb_dn_get_comp_num((*m1)->dn);
 504         cn2 = ldb_dn_get_comp_num((*m2)->dn);
 505         if (cn1 != cn2) {
 506                 return cn1 > cn2 ? 1 : -1;
 507         }
 508         usnchanged1 = ldb_msg_find_attr_as_uint(*m1, "uSNChanged", 0);
 509         usnchanged2 = ldb_msg_find_attr_as_uint(*m2, "uSNChanged", 0);
 510         if (usnchanged1 == usnchanged2) {
 511                 return 0;
 512         }
 513         return usnchanged1 > usnchanged2 ? 1 : -1;
 514 }
 515
 516
 517 /* state of a partially completed getncchanges call */
 518 struct drsuapi_getncchanges_state {
 519         struct ldb_result *site_res;
 520         uint32_t num_sent;
 521         struct ldb_dn *ncRoot_dn;
 522         uint64_t min_usn;
 523         uint64_t highest_usn;
 524         struct ldb_dn *last_dn;
 525 };
 526
 527 /*
 528   drsuapi_DsGetNCChanges
 529
 530   see MS-DRSR 4.1.10.5.2 for basic logic of this function
 531 */
 532 WERROR dcesrv_drsuapi_DsGetNCChanges(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx,
 533                                      struct drsuapi_DsGetNCChanges *r)
 534 {
 535         struct drsuapi_DsReplicaObjectIdentifier *ncRoot;
 536         int ret;
 537         int i;
 538         struct dsdb_schema *schema;
 539         struct drsuapi_DsReplicaOIDMapping_Ctr *ctr;
 540         struct drsuapi_DsReplicaObjectListItemEx **currentObject;
 541         NTSTATUS status;
 542         DATA_BLOB session_key;
 543         const char *attrs[] = { "*", "distinguishedName",
 544                                 "nTSecurityDescriptor",
 545                                 "parentGUID",
 546                                 "replPropertyMetaData",
 547                                 "unicodePwd",
 548                                 "dBCSPwd",
 549                                 "ntPwdHistory",
 550                                 "lmPwdHistory",
 551                                 "supplementalCredentials",
 552                                 NULL };
 553         WERROR werr;
 554         struct dcesrv_handle *h;
 555         struct drsuapi_bind_state *b_state;
 556         struct drsuapi_getncchanges_state *getnc_state;
 557         struct drsuapi_DsGetNCChangesRequest8 *req8;
 558         uint32_t options;
 559         uint32_t max_objects;
 560
 561         DCESRV_PULL_HANDLE_WERR(h, r->in.bind_handle, DRSUAPI_BIND_HANDLE);
 562         b_state = h->data;
 563
 564         *r->out.level_out = 6;
 565         /* TODO: linked attributes*/
 566         r->out.ctr->ctr6.linked_attributes_count = 0;
 567         r->out.ctr->ctr6.linked_attributes = NULL;
 568
 569         r->out.ctr->ctr6.object_count = 0;
 570         r->out.ctr->ctr6.nc_object_count = 0;
 571         r->out.ctr->ctr6.more_data = false;
 572         r->out.ctr->ctr6.uptodateness_vector = NULL;
 573
 574         /* a RODC doesn't allow for any replication */
 575         if (samdb_rodc(ldb_get_opaque(b_state->sam_ctx, "loadparm"))) {
 576                 DEBUG(0,(__location__ ": DsGetNCChanges attempt on RODC\n"));
 577                 return WERR_DS_DRA_SOURCE_DISABLED;
 578         }
 579
 580         /* Check request revision.
 581            TODO: Adding mappings to req8 from the other levels
 582          */
 583         if (r->in.level != 8) {
 584                 DEBUG(0,(__location__ ": Request for DsGetNCChanges with unsupported level %u\n",
 585                          r->in.level));
 586                 return WERR_REVISION_MISMATCH;
 587         }
 588
 589         req8 = &r->in.req->req8;
 590
 591         /* Perform access checks. */
 592         /* TODO: we need to support a sync on a specific non-root
 593          * DN. We'll need to find the real partition root here */
 594         ncRoot = req8->naming_context;
 595         if (ncRoot == NULL) {
 596                 DEBUG(0,(__location__ ": Request for DsGetNCChanges with no NC\n"));
 597                 return WERR_DS_DRA_INVALID_PARAMETER;
 598         }
 599
 600         if (samdb_ntds_options(b_state->sam_ctx, &options) != LDB_SUCCESS) {
 601                 return WERR_DS_DRA_INTERNAL_ERROR;
 602         }
 603
 604         if ((options & DS_NTDSDSA_OPT_DISABLE_OUTBOUND_REPL) &&
 605             !(req8->replica_flags & DRSUAPI_DRS_SYNC_FORCED)) {
 606                 return WERR_DS_DRA_SOURCE_DISABLED;
 607         }
 608
 609
 610         if (req8->replica_flags & DRSUAPI_DS_REPLICA_NEIGHBOUR_FULL_SYNC_PACKET) {
 611                 /* Ignore the _in_ uptpdateness vector*/
 612                 req8->uptodateness_vector = NULL;
 613         }
 614
 615         werr = drs_security_level_check(dce_call, "DsGetNCChanges");
 616         if (!W_ERROR_IS_OK(werr)) {
 617                 return werr;
 618         }
 619
 620         getnc_state = b_state->getncchanges_state;
 621
 622         /* see if a previous replication has been abandoned */
 623         if (getnc_state) {
 624                 struct ldb_dn *new_dn = ldb_dn_new(getnc_state, b_state->sam_ctx, ncRoot->dn);
 625                 if (ldb_dn_compare(new_dn, getnc_state->ncRoot_dn) != 0) {
 626                         DEBUG(0,(__location__ ": DsGetNCChanges 2nd replication on different DN %s %s (last_dn %s)\n",
 627                                  ldb_dn_get_linearized(new_dn),
 628                                  ldb_dn_get_linearized(getnc_state->ncRoot_dn),
 629                                  ldb_dn_get_linearized(getnc_state->last_dn)));
 630                         talloc_free(getnc_state);
 631                         getnc_state = NULL;
 632                 }
 633         }
 634
 635         if (getnc_state == NULL) {
 636                 getnc_state = talloc_zero(b_state, struct drsuapi_getncchanges_state);
 637                 if (getnc_state == NULL) {
 638                         return WERR_NOMEM;
 639                 }
 640                 b_state->getncchanges_state = getnc_state;
 641                 getnc_state->ncRoot_dn = ldb_dn_new(getnc_state, b_state->sam_ctx, ncRoot->dn);
 642         }
 643
 644         if (!ldb_dn_validate(getnc_state->ncRoot_dn) ||
 645             ldb_dn_is_null(getnc_state->ncRoot_dn)) {
 646                 DEBUG(0,(__location__ ": Bad DN '%s'\n", ncRoot->dn));
 647                 return WERR_DS_DRA_INVALID_PARAMETER;
 648         }
 649
 650         /* we need the session key for encrypting password attributes */
 651         status = dcesrv_inherited_session_key(dce_call->conn, &session_key);
 652         if (!NT_STATUS_IS_OK(status)) {
 653                 DEBUG(0,(__location__ ": Failed to get session key\n"));
 654                 return WERR_DS_DRA_INTERNAL_ERROR;
 655         }
 656
 657         /* we don't yet support extended operations */
 658         if (req8->extended_op != DRSUAPI_EXOP_NONE) {
 659                 DEBUG(0,(__location__ ": Request for DsGetNCChanges extended op 0x%x\n",
 660                          (unsigned)req8->extended_op));
 661                 return WERR_DS_DRA_NOT_SUPPORTED;
 662         }
 663
 664         /*
 665            TODO: MS-DRSR section 4.1.10.1.1
 666            Work out if this is the start of a new cycle */
 667
 668         if (getnc_state->site_res == NULL) {
 669                 char* search_filter;
 670                 enum ldb_scope scope = LDB_SCOPE_SUBTREE;
 671                 const char *extra_filter;
 672
 673                 extra_filter = lp_parm_string(dce_call->conn->dce_ctx->lp_ctx, NULL, "drs", "object filter");
 674
 675                 getnc_state->min_usn = req8->highwatermark.highest_usn;
 676
 677                 /* Construct response. */
 678                 search_filter = talloc_asprintf(mem_ctx,
 679                                                 "(uSNChanged>=%llu)",
 680                                                 (unsigned long long)(getnc_state->min_usn+1));
 681
 682                 if (extra_filter) {
 683                         search_filter = talloc_asprintf(mem_ctx, "(&%s(%s))", search_filter, extra_filter);
 684                 }
 685
 686                 if (req8->replica_flags & DRSUAPI_DS_REPLICA_NEIGHBOUR_CRITICAL_ONLY) {
 687                         search_filter = talloc_asprintf(mem_ctx,
 688                                                         "(&%s(isCriticalSystemObject=TRUE))",
 689                                                         search_filter);
 690                 }
 691
 692                 if (req8->replica_flags & DRSUAPI_DS_REPLICA_NEIGHBOUR_ASYNC_REP) {
 693                         scope = LDB_SCOPE_BASE;
 694                 }
 695
 696                 DEBUG(1,(__location__ ": getncchanges on %s using filter %s\n",
 697                          ldb_dn_get_linearized(getnc_state->ncRoot_dn), search_filter));
 698                 ret = drsuapi_search_with_extended_dn(b_state->sam_ctx, getnc_state, &getnc_state->site_res,
 699                                                       getnc_state->ncRoot_dn, scope, attrs,
 700                                                       search_filter);
 701                 if (ret != LDB_SUCCESS) {
 702                         return WERR_DS_DRA_INTERNAL_ERROR;
 703                 }
 704
 705                 if (req8->replica_flags & DRSUAPI_DS_REPLICA_NEIGHBOUR_RETURN_OBJECT_PARENTS) {
 706                         qsort(getnc_state->site_res->msgs,
 707                               getnc_state->site_res->count,
 708                               sizeof(getnc_state->site_res->msgs[0]),
 709                               (comparison_fn_t)site_res_cmp_parent_order);
 710                 } else {
 711                         qsort(getnc_state->site_res->msgs,
 712                               getnc_state->site_res->count,
 713                               sizeof(getnc_state->site_res->msgs[0]),
 714                               (comparison_fn_t)site_res_cmp_usn_order);
 715                 }
 716
 717         }
 718
 719         /* Prefix mapping */
 720         schema = dsdb_get_schema(b_state->sam_ctx);
 721         if (!schema) {
 722                 DEBUG(0,("No schema in sam_ctx\n"));
 723                 return WERR_DS_DRA_INTERNAL_ERROR;
 724         }
 725
 726         r->out.ctr->ctr6.naming_context = talloc(mem_ctx, struct drsuapi_DsReplicaObjectIdentifier);
 727         *r->out.ctr->ctr6.naming_context = *ncRoot;
 728
 729         if (dsdb_find_guid_by_dn(b_state->sam_ctx, getnc_state->ncRoot_dn,
 730                                  &r->out.ctr->ctr6.naming_context->guid) != LDB_SUCCESS) {
 731                 DEBUG(0,(__location__ ": Failed to find GUID of ncRoot_dn %s\n",
 732                          ldb_dn_get_linearized(getnc_state->ncRoot_dn)));
 733                 return WERR_DS_DRA_INTERNAL_ERROR;
 734         }
 735
 736         /* find the SID if there is one */
 737         dsdb_find_sid_by_dn(b_state->sam_ctx, getnc_state->ncRoot_dn, &r->out.ctr->ctr6.naming_context->sid);
 738
 739         dsdb_get_oid_mappings_drsuapi(schema, true, mem_ctx, &ctr);
 740         r->out.ctr->ctr6.mapping_ctr = *ctr;
 741
 742         r->out.ctr->ctr6.source_dsa_guid = *(samdb_ntds_objectGUID(b_state->sam_ctx));
 743         r->out.ctr->ctr6.source_dsa_invocation_id = *(samdb_ntds_invocation_id(b_state->sam_ctx));
 744
 745         r->out.ctr->ctr6.old_highwatermark = req8->highwatermark;
 746         r->out.ctr->ctr6.new_highwatermark = req8->highwatermark;
 747
 748         r->out.ctr->ctr6.first_object = NULL;
 749         currentObject = &r->out.ctr->ctr6.first_object;
 750
 751         /* use this to force single objects at a time, which is useful
 752          * for working out what object is giving problems
 753          */
 754         max_objects = lp_parm_int(dce_call->conn->dce_ctx->lp_ctx, NULL, "drs", "max object sync", 1000);
 755         if (req8->max_object_count < max_objects) {
 756                 max_objects = req8->max_object_count;
 757         }
 758
 759         for(i=getnc_state->num_sent;
 760             i<getnc_state->site_res->count &&
 761                     (r->out.ctr->ctr6.object_count < max_objects);
 762             i++) {
 763                 int uSN;
 764                 struct drsuapi_DsReplicaObjectListItemEx *obj;
 765                 struct ldb_message *msg = getnc_state->site_res->msgs[i];
 766
 767                 obj = talloc_zero(mem_ctx, struct drsuapi_DsReplicaObjectListItemEx);
 768
 769                 uSN = ldb_msg_find_attr_as_int(msg, "uSNChanged", -1);
 770                 if (uSN > r->out.ctr->ctr6.new_highwatermark.tmp_highest_usn) {
 771                         r->out.ctr->ctr6.new_highwatermark.tmp_highest_usn = uSN;
 772                 }
 773                 if (uSN > getnc_state->highest_usn) {
 774                         getnc_state->highest_usn = uSN;
 775                 }
 776
 777                 werr = get_nc_changes_build_object(obj, msg,
 778                                                    b_state->sam_ctx, getnc_state->ncRoot_dn,
 779                                                    schema, &session_key, getnc_state->min_usn,
 780                                                    req8->replica_flags);
 781                 if (!W_ERROR_IS_OK(werr)) {
 782                         return werr;
 783                 }
 784
 785                 werr = get_nc_changes_add_links(b_state->sam_ctx, mem_ctx,
 786                                                 getnc_state->ncRoot_dn,
 787                                                 schema, getnc_state->min_usn,
 788                                                 req8->replica_flags,
 789                                                 msg,
 790                                                 &r->out.ctr->ctr6.linked_attributes,
 791                                                 &r->out.ctr->ctr6.linked_attributes_count);
 792                 if (!W_ERROR_IS_OK(werr)) {
 793                         return werr;
 794                 }
 795
 796                 if (obj->meta_data_ctr == NULL) {
 797                         DEBUG(0,(__location__ ": getncchanges skipping send of object %s\n",
 798                                  ldb_dn_get_linearized(msg->dn)));
 799                         /* no attributes to send */
 800                         talloc_free(obj);
 801                         continue;
 802                 }
 803
 804                 r->out.ctr->ctr6.object_count++;
 805
 806                 *currentObject = obj;
 807                 currentObject = &obj->next_object;
 808
 809                 talloc_free(getnc_state->last_dn);
 810                 getnc_state->last_dn = ldb_dn_copy(getnc_state, msg->dn);
 811
 812                 DEBUG(8,(__location__ ": replicating object %s\n", ldb_dn_get_linearized(msg->dn)));
 813         }
 814
 815         getnc_state->num_sent += r->out.ctr->ctr6.object_count;
 816
 817         r->out.ctr->ctr6.nc_object_count = getnc_state->site_res->count;
 818
 819         /* the client can us to call UpdateRefs on its behalf to
 820            re-establish monitoring of the NC */
 821         if ((req8->replica_flags & DRSUAPI_DRS_ADD_REF) &&
 822             !GUID_all_zero(&req8->destination_dsa_guid)) {
 823                 struct drsuapi_DsReplicaUpdateRefsRequest1 ureq;
 824                 ureq.naming_context = ncRoot;
 825                 ureq.dest_dsa_dns_name = talloc_asprintf(mem_ctx, "%s._msdcs.%s",
 826                                                          GUID_string(mem_ctx, &req8->destination_dsa_guid),
 827                                                          lp_realm(dce_call->conn->dce_ctx->lp_ctx));
 828                 if (!ureq.dest_dsa_dns_name) {
 829                         return WERR_NOMEM;
 830                 }
 831                 ureq.dest_dsa_guid = req8->destination_dsa_guid;
 832                 ureq.options = DRSUAPI_DS_REPLICA_UPDATE_ADD_REFERENCE |
 833                         DRSUAPI_DS_REPLICA_UPDATE_ASYNCHRONOUS_OPERATION |
 834                         DRSUAPI_DS_REPLICA_UPDATE_GETCHG_CHECK;
 835                 werr = drsuapi_UpdateRefs(b_state, mem_ctx, &ureq);
 836                 if (!W_ERROR_IS_OK(werr)) {
 837                         DEBUG(0,(__location__ ": Failed UpdateRefs in DsGetNCChanges - %s\n",
 838                                  win_errstr(werr)));
 839                 }
 840         }
 841
 842         if (i < getnc_state->site_res->count) {
 843                 r->out.ctr->ctr6.more_data = true;
 844         } else {
 845                 r->out.ctr->ctr6.uptodateness_vector = talloc(mem_ctx, struct drsuapi_DsReplicaCursor2CtrEx);
 846                 r->out.ctr->ctr6.uptodateness_vector->version = 2;
 847                 r->out.ctr->ctr6.uptodateness_vector->reserved1 = 0;
 848                 r->out.ctr->ctr6.uptodateness_vector->reserved2 = 0;
 849
 850                 r->out.ctr->ctr6.new_highwatermark.highest_usn = r->out.ctr->ctr6.new_highwatermark.tmp_highest_usn;
 851
 852                 werr = get_nc_changes_udv(b_state->sam_ctx, getnc_state->ncRoot_dn,
 853                                           r->out.ctr->ctr6.uptodateness_vector,
 854                                           getnc_state->highest_usn);
 855                 if (!W_ERROR_IS_OK(werr)) {
 856                         return werr;
 857                 }
 858
 859                 talloc_free(getnc_state);
 860                 b_state->getncchanges_state = NULL;
 861         }
 862
 863         DEBUG(r->out.ctr->ctr6.more_data?2:1,
 864               ("DsGetNCChanges with uSNChanged >= %llu flags 0x%08x on %s gave %u objects (done %d/%d la=%d)\n",
 865                (unsigned long long)(req8->highwatermark.highest_usn+1),
 866                req8->replica_flags,
 867                ncRoot->dn, r->out.ctr->ctr6.object_count,
 868                i, r->out.ctr->ctr6.more_data?getnc_state->site_res->count:i,
 869                r->out.ctr->ctr6.linked_attributes_count));
 870
 871 #if 0
 872         if (!r->out.ctr->ctr6.more_data) {
 873                 NDR_PRINT_FUNCTION_DEBUG(drsuapi_DsGetNCChanges, NDR_BOTH, r);
 874         }
 875 #endif
 876
 877         return WERR_OK;
 878 }