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 "librpc/gen_ndr/ndr_drsuapi.h"
  25 #include "rpc_server/dcerpc_server.h"
  26 #include "rpc_server/common/common.h"
  27 #include "dsdb/samdb/samdb.h"
  28 #include "lib/ldb/include/ldb_errors.h"
  29 #include "param/param.h"
  30 #include "librpc/gen_ndr/ndr_drsblobs.h"
  31 #include "auth/auth.h"
  32 #include "rpc_server/drsuapi/dcesrv_drsuapi.h"
  33 #include "rpc_server/dcerpc_server_proto.h"
  34 #include "../libcli/drsuapi/drsuapi.h"
  35 #include "../libcli/security/dom_sid.h"
  36
  37 /*
  38   drsuapi_DsGetNCChanges for one object
  39 */
  40 static WERROR get_nc_changes_build_object(struct drsuapi_DsReplicaObjectListItemEx *obj,
  41                                           struct ldb_message *msg,
  42                                           struct ldb_context *sam_ctx,
  43                                           struct ldb_dn *ncRoot_dn,
  44                                           struct dsdb_schema *schema,
  45                                           DATA_BLOB *session_key,
  46                                           uint64_t highest_usn)
  47 {
  48         const struct ldb_val *md_value;
  49         int i, n;
  50         struct ldb_dn *obj_dn;
  51         struct replPropertyMetaDataBlob md;
  52         struct dom_sid *sid;
  53         uint32_t rid = 0;
  54         enum ndr_err_code ndr_err;
  55         uint32_t *attids;
  56
  57         if (ldb_dn_compare(ncRoot_dn, msg->dn) == 0) {
  58                 obj->is_nc_prefix = true;
  59                 obj->parent_object_guid = NULL;
  60         } else {
  61                 obj->is_nc_prefix = false;
  62                 obj->parent_object_guid = talloc(obj, struct GUID);
  63                 *obj->parent_object_guid = samdb_result_guid(msg, "parentGUID");
  64         }
  65         obj->next_object = NULL;
  66
  67         md_value = ldb_msg_find_ldb_val(msg, "replPropertyMetaData");
  68         if (!md_value) {
  69                 /* nothing to send */
  70                 return WERR_OK;
  71         }
  72
  73         ndr_err = ndr_pull_struct_blob(md_value, obj,
  74                                        lp_iconv_convenience(ldb_get_opaque(sam_ctx, "loadparm")), &md,
  75                                        (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
  76         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  77                 return WERR_DS_DRA_INTERNAL_ERROR;
  78         }
  79
  80         if (md.version != 1) {
  81                 return WERR_DS_DRA_INTERNAL_ERROR;
  82         }
  83
  84         obj->meta_data_ctr = talloc(obj, struct drsuapi_DsReplicaMetaDataCtr);
  85         attids = talloc_array(obj, uint32_t, md.ctr.ctr1.count);
  86
  87         obj->meta_data_ctr->meta_data = talloc_array(obj, struct drsuapi_DsReplicaMetaData, md.ctr.ctr1.count);
  88         for (n=i=0; i<md.ctr.ctr1.count; i++) {
  89                 if (md.ctr.ctr1.array[i].originating_usn < highest_usn) continue;
  90                 obj->meta_data_ctr->meta_data[n].originating_change_time = md.ctr.ctr1.array[i].originating_change_time;
  91                 obj->meta_data_ctr->meta_data[n].version = md.ctr.ctr1.array[i].version;
  92                 obj->meta_data_ctr->meta_data[n].originating_invocation_id = md.ctr.ctr1.array[i].originating_invocation_id;
  93                 obj->meta_data_ctr->meta_data[n].originating_usn = md.ctr.ctr1.array[i].originating_usn;
  94                 attids[n] = md.ctr.ctr1.array[i].attid;
  95                 n++;
  96         }
  97         if (n == 0) {
  98                 /* nothing to send */
  99                 talloc_free(obj->meta_data_ctr);
 100                 obj->meta_data_ctr = NULL;
 101                 return WERR_OK;
 102         }
 103         obj->meta_data_ctr->count = n;
 104
 105         obj->object.identifier = talloc(obj, struct drsuapi_DsReplicaObjectIdentifier);
 106         obj_dn = ldb_msg_find_attr_as_dn(sam_ctx, obj, msg, "distinguishedName");
 107         obj->object.identifier->dn = ldb_dn_get_linearized(obj_dn);
 108         obj->object.identifier->guid = samdb_result_guid(msg, "objectGUID");
 109         sid = samdb_result_dom_sid(obj, msg, "objectSid");
 110         if (sid) {
 111                 dom_sid_split_rid(NULL, sid, NULL, &rid);
 112                 obj->object.identifier->sid = *sid;
 113         } else {
 114                 ZERO_STRUCT(obj->object.identifier->sid);
 115         }
 116
 117         obj->object.attribute_ctr.num_attributes = obj->meta_data_ctr->count;
 118         obj->object.attribute_ctr.attributes = talloc_array(obj, struct drsuapi_DsReplicaAttribute,
 119                                                             obj->object.attribute_ctr.num_attributes);
 120
 121         /*
 122          * Note that the meta_data array and the attributes array must
 123          * be the same size and in the same order
 124          */
 125         for (i=0; i<obj->object.attribute_ctr.num_attributes; i++) {
 126                 const struct dsdb_attribute *sa;
 127                 struct ldb_message_element *el;
 128                 WERROR werr;
 129
 130                 sa = dsdb_attribute_by_attributeID_id(schema, attids[i]);
 131                 if (!sa) {
 132                         DEBUG(0,("Unable to find attributeID %u in schema\n", attids[i]));
 133                         return WERR_DS_DRA_INTERNAL_ERROR;
 134                 }
 135
 136                 el = ldb_msg_find_element(msg, sa->lDAPDisplayName);
 137                 if (el == NULL) {
 138                         DEBUG(0,("No element '%s' for attributeID %u in message\n",
 139                                  sa->lDAPDisplayName, attids[i]));
 140                         ZERO_STRUCT(obj->object.attribute_ctr.attributes[i]);
 141                         obj->object.attribute_ctr.attributes[i].attid = attids[i];
 142                 } else {
 143                         werr = dsdb_attribute_ldb_to_drsuapi(sam_ctx, schema, el, obj,
 144                                                              &obj->object.attribute_ctr.attributes[i]);
 145                         if (!W_ERROR_IS_OK(werr)) {
 146                                 DEBUG(0,("Unable to convert %s to DRS object - %s\n",
 147                                          sa->lDAPDisplayName, win_errstr(werr)));
 148                                 return werr;
 149                         }
 150
 151                         /* some attributes needs to be encrypted
 152                            before being sent */
 153                         werr = drsuapi_encrypt_attribute(obj, session_key, rid,
 154                                                          &obj->object.attribute_ctr.attributes[i]);
 155                         if (!W_ERROR_IS_OK(werr)) {
 156                                 DEBUG(0,("Unable to encrypt %s in DRS object - %s\n",
 157                                          sa->lDAPDisplayName, win_errstr(werr)));
 158                                 return werr;
 159                         }
 160                 }
 161         }
 162
 163         return WERR_OK;
 164 }
 165
 166 static int replmd_drsuapi_DsReplicaCursor2_compare(const struct drsuapi_DsReplicaCursor2 *c1,
 167                                                    const struct drsuapi_DsReplicaCursor2 *c2)
 168 {
 169         return GUID_compare(&c1->source_dsa_invocation_id, &c2->source_dsa_invocation_id);
 170 }
 171
 172 /*
 173   load replUpToDateVector from a DN
 174  */
 175 static WERROR load_udv(struct ldb_context *sam_ctx, TALLOC_CTX *mem_ctx,
 176                        struct ldb_dn *dn, struct replUpToDateVectorBlob *ouv)
 177 {
 178         const char *attrs[] = { "replUpToDateVector", NULL };
 179         struct ldb_result *res = NULL;
 180         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 181         struct ldb_message_element *el;
 182         enum ndr_err_code ndr_err;
 183
 184         ZERO_STRUCTP(ouv);
 185
 186         if (ldb_search(sam_ctx, tmp_ctx, &res, dn, LDB_SCOPE_BASE, attrs, NULL) != LDB_SUCCESS ||
 187             res->count < 1) {
 188                 DEBUG(0,("load_udv: failed to read partition object\n"));
 189                 talloc_free(tmp_ctx);
 190                 return WERR_DS_DRA_INTERNAL_ERROR;
 191         }
 192
 193         el = ldb_msg_find_element(res->msgs[0], "replUpToDateVector");
 194         if (el == NULL || el->num_values < 1) {
 195                 talloc_free(tmp_ctx);
 196                 ouv->version = 2;
 197                 return WERR_OK;
 198         }
 199
 200         ndr_err = ndr_pull_struct_blob(&el->values[0],
 201                                        mem_ctx, lp_iconv_convenience(ldb_get_opaque(sam_ctx, "loadparm")),
 202                                        ouv,
 203                                        (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
 204         talloc_free(tmp_ctx);
 205         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 206                 DEBUG(0,(__location__ ": Failed to parse replUpToDateVector for %s\n",
 207                          ldb_dn_get_linearized(dn)));
 208                 return WERR_DS_DRA_INTERNAL_ERROR;
 209         }
 210
 211         return WERR_OK;
 212
 213 }
 214
 215 /*
 216   fill in the cursors return based on the replUpToDateVector for the ncRoot_dn
 217  */
 218 static WERROR get_nc_changes_udv(struct ldb_context *sam_ctx,
 219                                  struct ldb_dn *ncRoot_dn,
 220                                  struct drsuapi_DsReplicaCursor2CtrEx *udv)
 221 {
 222         WERROR werr;
 223         struct drsuapi_DsReplicaCursor2 *tmp_cursor;
 224         uint64_t highest_commited_usn;
 225         NTTIME now;
 226         time_t t = time(NULL);
 227         int ret;
 228         struct replUpToDateVectorBlob ouv;
 229
 230         werr = load_udv(sam_ctx, udv, ncRoot_dn, &ouv);
 231         if (!W_ERROR_IS_OK(werr)) {
 232                 return werr;
 233         }
 234
 235         ret = ldb_sequence_number(sam_ctx, LDB_SEQ_HIGHEST_SEQ, &highest_commited_usn);
 236         if (ret != LDB_SUCCESS) {
 237                 return WERR_DS_DRA_INTERNAL_ERROR;
 238         }
 239
 240         tmp_cursor = talloc(udv, struct drsuapi_DsReplicaCursor2);
 241         tmp_cursor->source_dsa_invocation_id = *(samdb_ntds_invocation_id(sam_ctx));
 242         tmp_cursor->highest_usn = highest_commited_usn;
 243         unix_to_nt_time(&now, t);
 244         tmp_cursor->last_sync_success = now;
 245
 246         udv->count = ouv.ctr.ctr2.count + 1;
 247         udv->cursors = talloc_steal(udv, ouv.ctr.ctr2.cursors);
 248         udv->cursors = talloc_realloc(udv, udv->cursors, struct drsuapi_DsReplicaCursor2, udv->count);
 249         if (!udv->cursors) {
 250                 return WERR_DS_DRA_INTERNAL_ERROR;
 251         }
 252         udv->cursors[udv->count - 1] = *tmp_cursor;
 253
 254         qsort(udv->cursors, udv->count,
 255               sizeof(struct drsuapi_DsReplicaCursor2),
 256               (comparison_fn_t)replmd_drsuapi_DsReplicaCursor2_compare);
 257
 258         return WERR_OK;
 259 }
 260
 261 /*
 262   drsuapi_DsGetNCChanges
 263 */
 264 WERROR dcesrv_drsuapi_DsGetNCChanges(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx,
 265                                      struct drsuapi_DsGetNCChanges *r)
 266 {
 267         struct ldb_result *site_res;
 268         struct drsuapi_DsReplicaObjectIdentifier *ncRoot;
 269         struct ldb_context *sam_ctx;
 270         struct ldb_dn *ncRoot_dn;
 271         int ret;
 272         int i;
 273         struct dsdb_schema *schema;
 274         struct drsuapi_DsReplicaOIDMapping_Ctr *ctr;
 275         struct drsuapi_DsReplicaObjectListItemEx **currentObject;
 276         NTSTATUS status;
 277         DATA_BLOB session_key;
 278         const char *attrs[] = { "*", "parentGUID", NULL };
 279         WERROR werr;
 280
 281         /*
 282          * connect to the samdb. TODO: We need to check that the caller
 283          * has the rights to do this. This exposes all attributes,
 284          * including all passwords.
 285          */
 286         sam_ctx = samdb_connect(mem_ctx, dce_call->event_ctx, dce_call->conn->dce_ctx->lp_ctx,
 287                                 system_session(mem_ctx, dce_call->conn->dce_ctx->lp_ctx));
 288         if (!sam_ctx) {
 289                 return WERR_FOOBAR;
 290         }
 291
 292         /* Check request revision. */
 293         if (r->in.level != 8) {
 294                 return WERR_REVISION_MISMATCH;
 295         }
 296
 297         /* Perform access checks. */
 298         if (r->in.req->req8.naming_context == NULL) {
 299                 return WERR_DS_DRA_INVALID_PARAMETER;
 300         }
 301
 302         ncRoot = r->in.req->req8.naming_context;
 303         if (ncRoot == NULL) {
 304                 return WERR_DS_DRA_BAD_NC;
 305         }
 306
 307         /* we need the session key for encrypting password attributes */
 308         status = dcesrv_inherited_session_key(dce_call->conn, &session_key);
 309         if (!NT_STATUS_IS_OK(status)) {
 310                 DEBUG(0,(__location__ ": Failed to get session key\n"));
 311                 return WERR_DS_DRA_INTERNAL_ERROR;
 312         }
 313
 314         /* Construct response. */
 315         ncRoot_dn = ldb_dn_new(mem_ctx, sam_ctx, ncRoot->dn);
 316         ret = drsuapi_search_with_extended_dn(sam_ctx, mem_ctx, &site_res,
 317                                               ncRoot_dn, LDB_SCOPE_SUBTREE, attrs,
 318                                               "(&(uSNChanged>=%llu)(objectClass=*))",
 319                                               (unsigned long long)r->in.req->req8.highwatermark.highest_usn);
 320         if (ret != LDB_SUCCESS) {
 321                 return WERR_DS_DRA_INTERNAL_ERROR;
 322         }
 323
 324         *r->out.level_out = 6;
 325         r->out.ctr->ctr6.naming_context = talloc(mem_ctx, struct drsuapi_DsReplicaObjectIdentifier);
 326         *r->out.ctr->ctr6.naming_context = *ncRoot;
 327         /* TODO: linked attributes*/
 328         r->out.ctr->ctr6.linked_attributes_count = 0;
 329         r->out.ctr->ctr6.linked_attributes = NULL;
 330
 331         r->out.ctr->ctr6.object_count = 0;
 332         r->out.ctr->ctr6.more_data = false;
 333         r->out.ctr->ctr6.uptodateness_vector = NULL;
 334
 335         /* Prefix mapping */
 336         schema = dsdb_get_schema(sam_ctx);
 337         if (!schema) {
 338                 DEBUG(0,("No schema in sam_ctx\n"));
 339                 return WERR_DS_DRA_INTERNAL_ERROR;
 340         }
 341
 342         dsdb_get_oid_mappings_drsuapi(schema, true, mem_ctx, &ctr);
 343         r->out.ctr->ctr6.mapping_ctr = *ctr;
 344
 345         r->out.ctr->ctr6.source_dsa_guid = *(samdb_ntds_objectGUID(sam_ctx));
 346         r->out.ctr->ctr6.source_dsa_invocation_id = *(samdb_ntds_invocation_id(sam_ctx));
 347
 348         r->out.ctr->ctr6.old_highwatermark = r->in.req->req8.highwatermark;
 349         r->out.ctr->ctr6.new_highwatermark = r->in.req->req8.highwatermark;
 350
 351         r->out.ctr->ctr6.uptodateness_vector = talloc(mem_ctx, struct drsuapi_DsReplicaCursor2CtrEx);
 352         r->out.ctr->ctr6.uptodateness_vector->version = 2;
 353         r->out.ctr->ctr6.uptodateness_vector->reserved1 = 0;
 354         r->out.ctr->ctr6.uptodateness_vector->reserved2 = 0;
 355
 356         r->out.ctr->ctr6.first_object = NULL;
 357         currentObject = &r->out.ctr->ctr6.first_object;
 358
 359         for(i=0; i<site_res->count; i++) {
 360                 int uSN;
 361                 struct drsuapi_DsReplicaObjectListItemEx *obj;
 362                 obj = talloc_zero(mem_ctx, struct drsuapi_DsReplicaObjectListItemEx);
 363
 364                 uSN = ldb_msg_find_attr_as_int(site_res->msgs[i], "uSNChanged", -1);
 365                 if (uSN > r->out.ctr->ctr6.new_highwatermark.highest_usn) {
 366                         r->out.ctr->ctr6.new_highwatermark.highest_usn = uSN;
 367                 }
 368
 369                 werr = get_nc_changes_build_object(obj, site_res->msgs[i], sam_ctx, ncRoot_dn,
 370                                                    schema, &session_key, r->in.req->req8.highwatermark.highest_usn);
 371                 if (!W_ERROR_IS_OK(werr)) {
 372                         return werr;
 373                 }
 374
 375                 if (obj->meta_data_ctr == NULL) {
 376                         /* no attributes to send */
 377                         talloc_free(obj);
 378                         continue;
 379                 }
 380
 381                 r->out.ctr->ctr6.object_count++;
 382
 383                 *currentObject = obj;
 384                 currentObject = &obj->next_object;
 385         }
 386
 387         werr = get_nc_changes_udv(sam_ctx, ncRoot_dn, r->out.ctr->ctr6.uptodateness_vector);
 388         if (!W_ERROR_IS_OK(werr)) {
 389                 return werr;
 390         }
 391
 392
 393         DEBUG(4,("DsGetNSChanges with uSNChanged >= %llu on %s gave %u objects\n",
 394                  (unsigned long long)r->in.req->req8.highwatermark.highest_usn,
 395                  ncRoot->dn, r->out.ctr->ctr6.object_count));
 396
 397         return WERR_OK;
 398 }