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