source4/dsdb/repl/drepl_service.c

   1 /*
   2    Unix SMB/CIFS mplementation.
   3    DSDB replication service
   4
   5    Copyright (C) Stefan Metzmacher 2007
   6    Copyright (C) Kamen Mazdrashki <kamenim@samba.org> 2010
   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
  23 #include "includes.h"
  24 #include "dsdb/samdb/samdb.h"
  25 #include "auth/auth.h"
  26 #include "smbd/service.h"
  27 #include "lib/events/events.h"
  28 #include "dsdb/repl/drepl_service.h"
  29 #include <ldb_errors.h>
  30 #include "../lib/util/dlinklist.h"
  31 #include "librpc/gen_ndr/ndr_misc.h"
  32 #include "librpc/gen_ndr/ndr_drsuapi.h"
  33 #include "librpc/gen_ndr/ndr_drsblobs.h"
  34 #include "librpc/gen_ndr/ndr_irpc.h"
  35 #include "param/param.h"
  36 #include "libds/common/roles.h"
  37
  38 /**
  39  * Call-back data for _drepl_replica_sync_done_cb()
  40  */
  41 struct drepl_replica_sync_cb_data {
  42         struct irpc_message *msg;
  43         struct drsuapi_DsReplicaSync *r;
  44
  45         /* number of ops left to be completed */
  46         int ops_count;
  47
  48         /* last failure error code */
  49         WERROR werr_last_failure;
  50 };
  51
  52
  53 static WERROR dreplsrv_init_creds(struct dreplsrv_service *service)
  54 {
  55         service->system_session_info = system_session(service->task->lp_ctx);
  56         if (service->system_session_info == NULL) {
  57                 return WERR_NOT_ENOUGH_MEMORY;
  58         }
  59
  60         return WERR_OK;
  61 }
  62
  63 static WERROR dreplsrv_connect_samdb(struct dreplsrv_service *service, struct loadparm_context *lp_ctx)
  64 {
  65         const struct GUID *ntds_guid;
  66         struct drsuapi_DsBindInfo28 *bind_info28;
  67
  68         service->samdb = samdb_connect(service, service->task->event_ctx, lp_ctx, service->system_session_info, 0);
  69         if (!service->samdb) {
  70                 return WERR_DS_UNAVAILABLE;
  71         }
  72
  73         ntds_guid = samdb_ntds_objectGUID(service->samdb);
  74         if (!ntds_guid) {
  75                 return WERR_DS_UNAVAILABLE;
  76         }
  77         service->ntds_guid = *ntds_guid;
  78
  79         if (samdb_rodc(service->samdb, &service->am_rodc) != LDB_SUCCESS) {
  80                 DEBUG(0,(__location__ ": Failed to determine RODC status\n"));
  81                 return WERR_DS_UNAVAILABLE;
  82         }
  83
  84         bind_info28                             = &service->bind_info28;
  85         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_BASE;
  86         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_ASYNC_REPLICATION;
  87         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_REMOVEAPI;
  88         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_MOVEREQ_V2;
  89         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_GETCHG_COMPRESS;
  90         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_DCINFO_V1;
  91         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_RESTORE_USN_OPTIMIZATION;
  92         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_KCC_EXECUTE;
  93         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_ADDENTRY_V2;
  94         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_LINKED_VALUE_REPLICATION;
  95         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_DCINFO_V2;
  96         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_INSTANCE_TYPE_NOT_REQ_ON_MOD;
  97         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_CRYPTO_BIND;
  98         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_GET_REPL_INFO;
  99         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_STRONG_ENCRYPTION;
 100         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_DCINFO_V01;
 101         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_TRANSITIVE_MEMBERSHIP;
 102         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_ADD_SID_HISTORY;
 103         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_POST_BETA3;
 104         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_GETCHGREQ_V5;
 105         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_GET_MEMBERSHIPS2;
 106         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_GETCHGREQ_V6;
 107         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_NONDOMAIN_NCS;
 108         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_GETCHGREQ_V8;
 109         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_GETCHGREPLY_V5;
 110         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_GETCHGREPLY_V6;
 111         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_ADDENTRYREPLY_V3;
 112         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_GETCHGREPLY_V7;
 113         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_VERIFY_OBJECT;
 114 #if 0 /* we don't support XPRESS compression yet */
 115         bind_info28->supported_extensions       |= DRSUAPI_SUPPORTED_EXTENSION_XPRESS_COMPRESS;
 116 #endif
 117         /* TODO: fill in site_guid */
 118         bind_info28->site_guid                  = GUID_zero();
 119         /* TODO: find out how this is really triggered! */
 120         bind_info28->pid                        = 0;
 121         bind_info28->repl_epoch                 = 0;
 122
 123         return WERR_OK;
 124 }
 125
 126
 127 /**
 128  * Callback for dreplsrv_out_operation operation completion.
 129  *
 130  * We just need to complete a waiting IRPC message here.
 131  * In case pull operation has failed,
 132  * caller of this callback will dump
 133  * failure information.
 134  *
 135  * NOTE: cb_data is allocated in IRPC msg's context
 136  * and will be freed during irpc_send_reply() call.
 137  */
 138 static void _drepl_replica_sync_done_cb(struct dreplsrv_service *service,
 139                                         WERROR werr,
 140                                         enum drsuapi_DsExtendedError ext_err,
 141                                         void *cb_data)
 142 {
 143         struct drepl_replica_sync_cb_data *data = talloc_get_type(cb_data,
 144                                                                   struct drepl_replica_sync_cb_data);
 145         struct irpc_message *msg = data->msg;
 146         struct drsuapi_DsReplicaSync *r = data->r;
 147
 148         /* store last bad result */
 149         if (!W_ERROR_IS_OK(werr)) {
 150                 data->werr_last_failure = werr;
 151         }
 152
 153         /* decrement pending ops count */
 154         data->ops_count--;
 155
 156         if (data->ops_count == 0) {
 157                 /* Return result to client */
 158                 r->out.result = data->werr_last_failure;
 159
 160                 /* complete IRPC message */
 161                 irpc_send_reply(msg, NT_STATUS_OK);
 162         }
 163 }
 164
 165 /**
 166  * Helper to schedule a replication operation with a source DSA.
 167  * If 'data' is valid pointer, then a callback
 168  * for the operation is passed and 'data->msg' is
 169  * marked as 'deferred' - defer_reply = true
 170  */
 171 static WERROR _drepl_schedule_replication(struct dreplsrv_service *service,
 172                                           struct dreplsrv_partition_source_dsa *dsa,
 173                                           struct drsuapi_DsReplicaObjectIdentifier *nc,
 174                                           uint32_t rep_options,
 175                                           struct drepl_replica_sync_cb_data *data,
 176                                           TALLOC_CTX *mem_ctx)
 177 {
 178         WERROR werr;
 179         dreplsrv_extended_callback_t fn_callback = NULL;
 180
 181         if (data) {
 182                 fn_callback = _drepl_replica_sync_done_cb;
 183         }
 184
 185         /* schedule replication item */
 186         werr = dreplsrv_schedule_partition_pull_source(service, dsa, rep_options,
 187                                                        DRSUAPI_EXOP_NONE, 0,
 188                                                        fn_callback, data);
 189         if (!W_ERROR_IS_OK(werr)) {
 190                 DEBUG(0,("%s: failed setup of sync of partition (%s, %s, %s) - %s\n",
 191                          __FUNCTION__,
 192                          GUID_string(mem_ctx, &nc->guid),
 193                          nc->dn,
 194                          dsa->repsFrom1->other_info->dns_name,
 195                          win_errstr(werr)));
 196                 return werr;
 197         }
 198         /* log we've scheduled a replication item */
 199         DEBUG(3,("%s: forcing sync of partition (%s, %s, %s)\n",
 200                  __FUNCTION__,
 201                  GUID_string(mem_ctx, &nc->guid),
 202                  nc->dn,
 203                  dsa->repsFrom1->other_info->dns_name));
 204
 205         /* mark IRPC message as deferred if necessary */
 206         if (data) {
 207                 data->ops_count++;
 208                 data->msg->defer_reply = true;
 209         }
 210
 211         return WERR_OK;
 212 }
 213
 214 /*
 215   DsReplicaSync messages from the DRSUAPI server are forwarded here
 216  */
 217 static NTSTATUS drepl_replica_sync(struct irpc_message *msg,
 218                                    struct drsuapi_DsReplicaSync *r)
 219 {
 220         WERROR werr;
 221         struct dreplsrv_partition *p;
 222         struct drepl_replica_sync_cb_data *cb_data;
 223         struct dreplsrv_partition_source_dsa *dsa;
 224         struct drsuapi_DsReplicaSyncRequest1 *req1;
 225         struct drsuapi_DsReplicaObjectIdentifier *nc;
 226         struct dreplsrv_service *service = talloc_get_type(msg->private_data,
 227                                                            struct dreplsrv_service);
 228
 229 #define REPLICA_SYNC_FAIL(_msg, _werr) do {\
 230                 if (!W_ERROR_IS_OK(_werr)) { \
 231                         DEBUG(0,(__location__ ": Failure - %s. werr = %s\n", \
 232                                  _msg, win_errstr(_werr))); \
 233                         NDR_PRINT_IN_DEBUG(drsuapi_DsReplicaSync, r); \
 234                 } \
 235                 r->out.result = _werr; \
 236                 goto done;\
 237         } while(0)
 238
 239
 240         if (r->in.level != 1) {
 241                 REPLICA_SYNC_FAIL("Unsupported level",
 242                                   WERR_DS_DRA_INVALID_PARAMETER);
 243         }
 244
 245         req1 = &r->in.req->req1;
 246         nc   = req1->naming_context;
 247
 248         /* Check input parameters */
 249         if (!nc) {
 250                 REPLICA_SYNC_FAIL("Invalid Naming Context",
 251                                   WERR_DS_DRA_INVALID_PARAMETER);
 252         }
 253
 254         /* Find Naming context to be synchronized */
 255         werr = dreplsrv_partition_find_for_nc(service,
 256                                               &nc->guid, &nc->sid, nc->dn,
 257                                               &p);
 258         if (!W_ERROR_IS_OK(werr)) {
 259                 REPLICA_SYNC_FAIL("Failed to find requested Naming Context",
 260                                   werr);
 261         }
 262
 263         /* should we process it asynchronously? */
 264         if (req1->options & DRSUAPI_DRS_ASYNC_OP) {
 265                 cb_data = NULL;
 266         } else {
 267                 cb_data = talloc_zero(msg, struct drepl_replica_sync_cb_data);
 268                 if (!cb_data) {
 269                         REPLICA_SYNC_FAIL("Not enought memory",
 270                                           WERR_DS_DRA_INTERNAL_ERROR);
 271                 }
 272
 273                 cb_data->msg = msg;
 274                 cb_data->r   = r;
 275                 cb_data->werr_last_failure = WERR_OK;
 276         }
 277
 278         /* collect source DSAs to sync with */
 279         if (req1->options & DRSUAPI_DRS_SYNC_ALL) {
 280                 for (dsa = p->sources; dsa; dsa = dsa->next) {
 281                         /* schedule replication item */
 282                         werr = _drepl_schedule_replication(service, dsa, nc,
 283                                                            req1->options, cb_data, msg);
 284                         if (!W_ERROR_IS_OK(werr)) {
 285                                 REPLICA_SYNC_FAIL("_drepl_schedule_replication() failed",
 286                                                   werr);
 287                         }
 288                 }
 289         } else {
 290                 if (req1->options & DRSUAPI_DRS_SYNC_BYNAME) {
 291                         /* client should pass at least valid string */
 292                         if (!req1->source_dsa_dns) {
 293                                 REPLICA_SYNC_FAIL("'source_dsa_dns' is not valid",
 294                                                   WERR_DS_DRA_INVALID_PARAMETER);
 295                         }
 296
 297                         werr = dreplsrv_partition_source_dsa_by_dns(p,
 298                                                                     req1->source_dsa_dns,
 299                                                                     &dsa);
 300                 } else {
 301                         /* client should pass at least some GUID */
 302                         if (GUID_all_zero(&req1->source_dsa_guid)) {
 303                                 REPLICA_SYNC_FAIL("'source_dsa_guid' is not valid",
 304                                                   WERR_DS_DRA_INVALID_PARAMETER);
 305                         }
 306
 307                         werr = dreplsrv_partition_source_dsa_by_guid(p,
 308                                                                      &req1->source_dsa_guid,
 309                                                                      &dsa);
 310                         if (W_ERROR_EQUAL(werr, WERR_DS_DRA_NO_REPLICA)) {
 311                                 /* we don't have this source setup as
 312                                    a replication partner. Create a
 313                                    temporary dsa structure for this
 314                                    replication */
 315                                 werr = dreplsrv_partition_source_dsa_temporary(p,
 316                                                                                msg,
 317                                                                                &req1->source_dsa_guid,
 318                                                                                &dsa);
 319                         }
 320                 }
 321                 if (!W_ERROR_IS_OK(werr)) {
 322                         REPLICA_SYNC_FAIL("Failed to locate source DSA for given NC",
 323                                           werr);
 324                 }
 325
 326                 /* schedule replication item */
 327                 werr = _drepl_schedule_replication(service, dsa, nc,
 328                                                    req1->options, cb_data, msg);
 329                 if (!W_ERROR_IS_OK(werr)) {
 330                         REPLICA_SYNC_FAIL("_drepl_schedule_replication() failed",
 331                                           werr);
 332                 }
 333         }
 334
 335         /* if we got here, everything is OK */
 336         r->out.result = WERR_OK;
 337
 338         /*
 339          * schedule replication event to force
 340          * replication as soon as possible
 341          */
 342         dreplsrv_pendingops_schedule(service, 0);
 343
 344 done:
 345         return NT_STATUS_OK;
 346 }
 347
 348 /**
 349  * Called when drplsrv should refresh its state.
 350  * For example, when KCC change topology, dreplsrv
 351  * should update its cache
 352  *
 353  * @param partition_dn If not empty/NULL, partition to update
 354  */
 355 static NTSTATUS dreplsrv_refresh(struct irpc_message *msg,
 356                                  struct dreplsrv_refresh *r)
 357 {
 358         struct dreplsrv_service *s = talloc_get_type(msg->private_data,
 359                                                      struct dreplsrv_service);
 360
 361         r->out.result = dreplsrv_refresh_partitions(s);
 362
 363         return NT_STATUS_OK;
 364 }
 365
 366 /**
 367  * Called when the auth code wants us to try and replicate
 368  * a users secrets
 369  */
 370 static NTSTATUS drepl_trigger_repl_secret(struct irpc_message *msg,
 371                                           struct drepl_trigger_repl_secret *r)
 372 {
 373         struct dreplsrv_service *service = talloc_get_type(msg->private_data,
 374                                                            struct dreplsrv_service);
 375
 376
 377         drepl_repl_secret(service, r->in.user_dn);
 378
 379         /* we are not going to be sending a reply to this request */
 380         msg->no_reply = true;
 381
 382         return NT_STATUS_OK;
 383 }
 384
 385
 386 /*
 387   DsReplicaAdd messages from the DRSUAPI server are forwarded here
 388  */
 389 static NTSTATUS dreplsrv_replica_add(struct irpc_message *msg,
 390                                   struct drsuapi_DsReplicaAdd *r)
 391 {
 392         struct dreplsrv_service *service = talloc_get_type(msg->private_data,
 393                                                            struct dreplsrv_service);
 394         return drepl_replica_add(service, r);
 395 }
 396
 397 /*
 398   DsReplicaDel messages from the DRSUAPI server are forwarded here
 399  */
 400 static NTSTATUS dreplsrv_replica_del(struct irpc_message *msg,
 401                                   struct drsuapi_DsReplicaDel *r)
 402 {
 403         struct dreplsrv_service *service = talloc_get_type(msg->private_data,
 404                                                            struct dreplsrv_service);
 405         return drepl_replica_del(service, r);
 406 }
 407
 408 /*
 409   DsReplicaMod messages from the DRSUAPI server are forwarded here
 410  */
 411 static NTSTATUS dreplsrv_replica_mod(struct irpc_message *msg,
 412                                   struct drsuapi_DsReplicaMod *r)
 413 {
 414         struct dreplsrv_service *service = talloc_get_type(msg->private_data,
 415                                                            struct dreplsrv_service);
 416         return drepl_replica_mod(service, r);
 417 }
 418
 419
 420 /*
 421   startup the dsdb replicator service task
 422 */
 423 static void dreplsrv_task_init(struct task_server *task)
 424 {
 425         WERROR status;
 426         struct dreplsrv_service *service;
 427         uint32_t periodic_startup_interval;
 428
 429         switch (lpcfg_server_role(task->lp_ctx)) {
 430         case ROLE_STANDALONE:
 431                 task_server_terminate(task, "dreplsrv: no DSDB replication required in standalone configuration",
 432                                       false);
 433                 return;
 434         case ROLE_DOMAIN_MEMBER:
 435                 task_server_terminate(task, "dreplsrv: no DSDB replication required in domain member configuration",
 436                                       false);
 437                 return;
 438         case ROLE_ACTIVE_DIRECTORY_DC:
 439                 /* Yes, we want DSDB replication */
 440                 break;
 441         }
 442
 443         task_server_set_title(task, "task[dreplsrv]");
 444
 445         service = talloc_zero(task, struct dreplsrv_service);
 446         if (!service) {
 447                 task_server_terminate(task, "dreplsrv_task_init: out of memory", true);
 448                 return;
 449         }
 450         service->task           = task;
 451         service->startup_time   = timeval_current();
 452         task->private_data      = service;
 453
 454         status = dreplsrv_init_creds(service);
 455         if (!W_ERROR_IS_OK(status)) {
 456                 task_server_terminate(task, talloc_asprintf(task,
 457                                       "dreplsrv: Failed to obtain server credentials: %s\n",
 458                                                             win_errstr(status)), true);
 459                 return;
 460         }
 461
 462         status = dreplsrv_connect_samdb(service, task->lp_ctx);
 463         if (!W_ERROR_IS_OK(status)) {
 464                 task_server_terminate(task, talloc_asprintf(task,
 465                                       "dreplsrv: Failed to connect to local samdb: %s\n",
 466                                                             win_errstr(status)), true);
 467                 return;
 468         }
 469
 470         status = dreplsrv_load_partitions(service);
 471         if (!W_ERROR_IS_OK(status)) {
 472                 task_server_terminate(task, talloc_asprintf(task,
 473                                       "dreplsrv: Failed to load partitions: %s\n",
 474                                                             win_errstr(status)), true);
 475                 return;
 476         }
 477
 478         periodic_startup_interval       = lpcfg_parm_int(task->lp_ctx, NULL, "dreplsrv", "periodic_startup_interval", 15); /* in seconds */
 479         service->periodic.interval      = lpcfg_parm_int(task->lp_ctx, NULL, "dreplsrv", "periodic_interval", 300); /* in seconds */
 480
 481         status = dreplsrv_periodic_schedule(service, periodic_startup_interval);
 482         if (!W_ERROR_IS_OK(status)) {
 483                 task_server_terminate(task, talloc_asprintf(task,
 484                                       "dreplsrv: Failed to periodic schedule: %s\n",
 485                                                             win_errstr(status)), true);
 486                 return;
 487         }
 488
 489         /* if we are a RODC then we do not send DSReplicaSync*/
 490         if (!service->am_rodc) {
 491                 service->notify.interval = lpcfg_parm_int(task->lp_ctx, NULL, "dreplsrv",
 492                                                            "notify_interval", 5); /* in seconds */
 493                 status = dreplsrv_notify_schedule(service, service->notify.interval);
 494                 if (!W_ERROR_IS_OK(status)) {
 495                         task_server_terminate(task, talloc_asprintf(task,
 496                                                   "dreplsrv: Failed to setup notify schedule: %s\n",
 497                                                                         win_errstr(status)), true);
 498                         return;
 499                 }
 500         }
 501
 502         irpc_add_name(task->msg_ctx, "dreplsrv");
 503
 504         IRPC_REGISTER(task->msg_ctx, irpc, DREPLSRV_REFRESH, dreplsrv_refresh, service);
 505         IRPC_REGISTER(task->msg_ctx, drsuapi, DRSUAPI_DSREPLICASYNC, drepl_replica_sync, service);
 506         IRPC_REGISTER(task->msg_ctx, drsuapi, DRSUAPI_DSREPLICAADD, dreplsrv_replica_add, service);
 507         IRPC_REGISTER(task->msg_ctx, drsuapi, DRSUAPI_DSREPLICADEL, dreplsrv_replica_del, service);
 508         IRPC_REGISTER(task->msg_ctx, drsuapi, DRSUAPI_DSREPLICAMOD, dreplsrv_replica_mod, service);
 509         IRPC_REGISTER(task->msg_ctx, irpc, DREPL_TAKEFSMOROLE, drepl_take_FSMO_role, service);
 510         IRPC_REGISTER(task->msg_ctx, irpc, DREPL_TRIGGER_REPL_SECRET, drepl_trigger_repl_secret, service);
 511         imessaging_register(task->msg_ctx, service, MSG_DREPL_ALLOCATE_RID, dreplsrv_allocate_rid);
 512 }
 513
 514 /*
 515   register ourselves as a available server
 516 */
 517 NTSTATUS server_service_drepl_init(void)
 518 {
 519         return register_server_service("drepl", dreplsrv_task_init);
 520 }