source4/dsdb/kcc/kcc_periodic.c

   1 /*
   2    Unix SMB/CIFS mplementation.
   3    KCC service periodic handling
   4
   5    Copyright (C) Andrew Tridgell 2009
   6    based on repl service code
   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 "lib/events/events.h"
  25 #include "dsdb/samdb/samdb.h"
  26 #include "auth/auth.h"
  27 #include "smbd/service.h"
  28 #include "lib/messaging/irpc.h"
  29 #include "dsdb/kcc/kcc_connection.h"
  30 #include "dsdb/kcc/kcc_service.h"
  31 #include "lib/ldb/include/ldb_errors.h"
  32 #include "../lib/util/dlinklist.h"
  33 #include "librpc/gen_ndr/ndr_misc.h"
  34 #include "librpc/gen_ndr/ndr_drsuapi.h"
  35 #include "librpc/gen_ndr/ndr_drsblobs.h"
  36 #include "librpc/gen_ndr/ndr_irpc_c.h"
  37 #include "param/param.h"
  38
  39 /*
  40  * see if two repsFromToBlob blobs are for the same source DSA
  41  */
  42 static bool kccsrv_same_source_dsa(struct repsFromToBlob *r1, struct repsFromToBlob *r2)
  43 {
  44         return GUID_compare(&r1->ctr.ctr1.source_dsa_obj_guid,
  45                             &r2->ctr.ctr1.source_dsa_obj_guid) == 0;
  46 }
  47
  48 /*
  49  * see if a repsFromToBlob is in a list
  50  */
  51 static bool reps_in_list(struct repsFromToBlob *r, struct repsFromToBlob *reps, uint32_t count)
  52 {
  53         uint32_t i;
  54         for (i=0; i<count; i++) {
  55                 if (kccsrv_same_source_dsa(r, &reps[i])) {
  56                         return true;
  57                 }
  58         }
  59         return false;
  60 }
  61
  62 /*
  63   make sure we only add repsFrom entries for DCs who are masters for
  64   the partition
  65  */
  66 static bool check_MasterNC(struct kccsrv_partition *p, struct repsFromToBlob *r,
  67                            struct ldb_result *res)
  68 {
  69         struct repsFromTo1 *r1 = &r->ctr.ctr1;
  70         struct GUID invocation_id = r1->source_dsa_invocation_id;
  71         unsigned int i, j;
  72
  73         /* we are expecting only version 1 */
  74         SMB_ASSERT(r->version == 1);
  75
  76         for (i=0; i<res->count; i++) {
  77                 struct ldb_message *msg = res->msgs[i];
  78                 struct ldb_message_element *el;
  79                 struct ldb_dn *dn;
  80
  81                 struct GUID id2 = samdb_result_guid(msg, "invocationID");
  82                 if (GUID_all_zero(&id2) ||
  83                     !GUID_equal(&invocation_id, &id2)) {
  84                         continue;
  85                 }
  86
  87                 el = ldb_msg_find_element(msg, "msDS-hasMasterNCs");
  88                 if (!el || el->num_values == 0) {
  89                         el = ldb_msg_find_element(msg, "hasMasterNCs");
  90                         if (!el || el->num_values == 0) {
  91                                 continue;
  92                         }
  93                 }
  94                 for (j=0; j<el->num_values; j++) {
  95                         dn = ldb_dn_from_ldb_val(p, p->service->samdb, &el->values[j]);
  96                         if (!ldb_dn_validate(dn)) {
  97                                 talloc_free(dn);
  98                                 continue;
  99                         }
 100                         if (ldb_dn_compare(dn, p->dn) == 0) {
 101                                 talloc_free(dn);
 102                                 DEBUG(5,("%s %s match on %s in %s\n",
 103                                          r1->other_info->dns_name,
 104                                          el->name,
 105                                          ldb_dn_get_linearized(dn),
 106                                          ldb_dn_get_linearized(msg->dn)));
 107                                 return true;
 108                         }
 109                         talloc_free(dn);
 110                 }
 111         }
 112         return false;
 113 }
 114
 115 struct kccsrv_notify_drepl_server_state {
 116         struct dreplsrv_refresh r;
 117 };
 118
 119 static void kccsrv_notify_drepl_server_done(struct tevent_req *subreq);
 120
 121 /**
 122  * Force dreplsrv to update its state as topology is changed
 123  */
 124 static void kccsrv_notify_drepl_server(struct kccsrv_service *s,
 125                                        TALLOC_CTX *mem_ctx)
 126 {
 127         struct kccsrv_notify_drepl_server_state *state;
 128         struct dcerpc_binding_handle *irpc_handle;
 129         struct tevent_req *subreq;
 130
 131         state = talloc_zero(s, struct kccsrv_notify_drepl_server_state);
 132         if (state == NULL) {
 133                 return;
 134         }
 135
 136         irpc_handle = irpc_binding_handle_by_name(state, s->task->msg_ctx,
 137                                                   "dreplsrv", &ndr_table_irpc);
 138         if (irpc_handle == NULL) {
 139                 /* dreplsrv is not running yet */
 140                 TALLOC_FREE(state);
 141                 return;
 142         }
 143
 144         subreq = dcerpc_dreplsrv_refresh_r_send(state, s->task->event_ctx,
 145                                                 irpc_handle, &state->r);
 146         if (subreq == NULL) {
 147                 TALLOC_FREE(state);
 148                 return;
 149         }
 150         tevent_req_set_callback(subreq, kccsrv_notify_drepl_server_done, state);
 151 }
 152
 153 static void kccsrv_notify_drepl_server_done(struct tevent_req *subreq)
 154 {
 155         struct kccsrv_notify_drepl_server_state *state =
 156                 tevent_req_callback_data(subreq,
 157                 struct kccsrv_notify_drepl_server_state);
 158         NTSTATUS status;
 159
 160         status = dcerpc_dreplsrv_refresh_r_recv(subreq, state);
 161         TALLOC_FREE(subreq);
 162
 163         /* we don't care about errors */
 164         TALLOC_FREE(state);
 165 }
 166
 167 static uint32_t kccsrv_replica_flags(struct kccsrv_service *s)
 168 {
 169         if (s->am_rodc) {
 170                 return DRSUAPI_DRS_INIT_SYNC |
 171                         DRSUAPI_DRS_PER_SYNC |
 172                         DRSUAPI_DRS_ADD_REF |
 173                         DRSUAPI_DRS_SPECIAL_SECRET_PROCESSING |
 174                         DRSUAPI_DRS_GET_ALL_GROUP_MEMBERSHIP |
 175                         DRSUAPI_DRS_NONGC_RO_REP;
 176         }
 177         return DRSUAPI_DRS_INIT_SYNC |
 178                 DRSUAPI_DRS_PER_SYNC |
 179                 DRSUAPI_DRS_ADD_REF |
 180                 DRSUAPI_DRS_WRIT_REP;
 181 }
 182
 183 /*
 184  * add any missing repsFrom structures to our partitions
 185  */
 186 static NTSTATUS kccsrv_add_repsFrom(struct kccsrv_service *s, TALLOC_CTX *mem_ctx,
 187                                     struct repsFromToBlob *reps, uint32_t count,
 188                                     struct ldb_result *res)
 189 {
 190         struct kccsrv_partition *p;
 191         bool notify_dreplsrv = false;
 192         uint32_t replica_flags = kccsrv_replica_flags(s);
 193
 194         /* update the repsFrom on all partitions */
 195         for (p=s->partitions; p; p=p->next) {
 196                 struct repsFromToBlob *our_reps;
 197                 uint32_t our_count;
 198                 WERROR werr;
 199                 uint32_t i, j;
 200                 bool modified = false;
 201
 202                 werr = dsdb_loadreps(s->samdb, mem_ctx, p->dn, "repsFrom", &our_reps, &our_count);
 203                 if (!W_ERROR_IS_OK(werr)) {
 204                         DEBUG(0,(__location__ ": Failed to load repsFrom from %s - %s\n",
 205                                  ldb_dn_get_linearized(p->dn), ldb_errstring(s->samdb)));
 206                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
 207                 }
 208
 209                 /* see if the entry already exists */
 210                 for (i=0; i<count; i++) {
 211                         for (j=0; j<our_count; j++) {
 212                                 if (kccsrv_same_source_dsa(&reps[i], &our_reps[j])) {
 213                                         /* we already have this one -
 214                                            check the replica_flags are right */
 215                                         if (replica_flags != our_reps[j].ctr.ctr1.replica_flags) {
 216                                                 /* we need to update the old one with
 217                                                  * the new flags
 218                                                  */
 219                                                 our_reps[j].ctr.ctr1.replica_flags = replica_flags;
 220                                                 modified = true;
 221                                         }
 222                                         break;
 223                                 }
 224                         }
 225                         if (j == our_count) {
 226                                 /* we don't have the new one - add it
 227                                  * if it is a master
 228                                  */
 229                                 if (!check_MasterNC(p, &reps[i], res)) {
 230                                         /* its not a master, we don't
 231                                            want to pull from it */
 232                                         continue;
 233                                 }
 234                                 /* we need to add it to our repsFrom */
 235                                 our_reps = talloc_realloc(mem_ctx, our_reps, struct repsFromToBlob, our_count+1);
 236                                 NT_STATUS_HAVE_NO_MEMORY(our_reps);
 237                                 our_reps[our_count] = reps[i];
 238                                 our_reps[our_count].ctr.ctr1.replica_flags = replica_flags;
 239                                 our_count++;
 240                                 modified = true;
 241                                 DEBUG(4,(__location__ ": Added repsFrom for %s\n",
 242                                          reps[i].ctr.ctr1.other_info->dns_name));
 243                         }
 244                 }
 245
 246                 /* remove any stale ones */
 247                 for (i=0; i<our_count; i++) {
 248                         if (!reps_in_list(&our_reps[i], reps, count) ||
 249                             !check_MasterNC(p, &our_reps[i], res)) {
 250                                 DEBUG(4,(__location__ ": Removed repsFrom for %s\n",
 251                                          our_reps[i].ctr.ctr1.other_info->dns_name));
 252                                 memmove(&our_reps[i], &our_reps[i+1], (our_count-(i+1))*sizeof(our_reps[0]));
 253                                 our_count--;
 254                                 i--;
 255                                 modified = true;
 256                         }
 257                 }
 258
 259                 if (modified) {
 260                         werr = dsdb_savereps(s->samdb, mem_ctx, p->dn, "repsFrom", our_reps, our_count);
 261                         if (!W_ERROR_IS_OK(werr)) {
 262                                 DEBUG(0,(__location__ ": Failed to save repsFrom to %s - %s\n",
 263                                          ldb_dn_get_linearized(p->dn), ldb_errstring(s->samdb)));
 264                                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 265                         }
 266                         /* dreplsrv should refresh its state */
 267                         notify_dreplsrv = true;
 268                 }
 269
 270                 /* remove stale repsTo entries */
 271                 modified = false;
 272                 werr = dsdb_loadreps(s->samdb, mem_ctx, p->dn, "repsTo", &our_reps, &our_count);
 273                 if (!W_ERROR_IS_OK(werr)) {
 274                         DEBUG(0,(__location__ ": Failed to load repsTo from %s - %s\n",
 275                                  ldb_dn_get_linearized(p->dn), ldb_errstring(s->samdb)));
 276                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
 277                 }
 278
 279                 /* remove any stale ones */
 280                 for (i=0; i<our_count; i++) {
 281                         if (!reps_in_list(&our_reps[i], reps, count)) {
 282                                 DEBUG(4,(__location__ ": Removed repsTo for %s\n",
 283                                          our_reps[i].ctr.ctr1.other_info->dns_name));
 284                                 memmove(&our_reps[i], &our_reps[i+1], (our_count-(i+1))*sizeof(our_reps[0]));
 285                                 our_count--;
 286                                 i--;
 287                                 modified = true;
 288                         }
 289                 }
 290
 291                 if (modified) {
 292                         werr = dsdb_savereps(s->samdb, mem_ctx, p->dn, "repsTo", our_reps, our_count);
 293                         if (!W_ERROR_IS_OK(werr)) {
 294                                 DEBUG(0,(__location__ ": Failed to save repsTo to %s - %s\n",
 295                                          ldb_dn_get_linearized(p->dn), ldb_errstring(s->samdb)));
 296                                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 297                         }
 298                         /* dreplsrv should refresh its state */
 299                         notify_dreplsrv = true;
 300                 }
 301         }
 302
 303         /* notify dreplsrv toplogy has changed */
 304         if (notify_dreplsrv) {
 305                 kccsrv_notify_drepl_server(s, mem_ctx);
 306         }
 307
 308         return NT_STATUS_OK;
 309
 310 }
 311
 312 /*
 313   this is the core of our initial simple KCC
 314   We just add a repsFrom entry for all DCs we find that have nTDSDSA
 315   objects, except for ourselves
 316  */
 317 NTSTATUS kccsrv_simple_update(struct kccsrv_service *s, TALLOC_CTX *mem_ctx)
 318 {
 319         struct ldb_result *res;
 320         unsigned int i;
 321         int ret;
 322         const char *attrs[] = { "objectGUID", "invocationID", "msDS-hasMasterNCs", "hasMasterNCs", NULL };
 323         struct repsFromToBlob *reps = NULL;
 324         uint32_t count = 0;
 325         struct kcc_connection_list *ntds_conn, *dsa_conn;
 326
 327         ret = ldb_search(s->samdb, mem_ctx, &res, s->config_dn, LDB_SCOPE_SUBTREE,
 328                          attrs, "objectClass=nTDSDSA");
 329         if (ret != LDB_SUCCESS) {
 330                 DEBUG(0,(__location__ ": Failed nTDSDSA search - %s\n", ldb_errstring(s->samdb)));
 331                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 332         }
 333
 334         /* get the current list of connections */
 335         ntds_conn = kccsrv_find_connections(s, mem_ctx);
 336
 337         dsa_conn = talloc_zero(mem_ctx, struct kcc_connection_list);
 338
 339         for (i=0; i<res->count; i++) {
 340                 struct repsFromTo1 *r1;
 341                 struct GUID ntds_guid, invocation_id;
 342
 343                 ntds_guid = samdb_result_guid(res->msgs[i], "objectGUID");
 344                 if (GUID_compare(&ntds_guid, &s->ntds_guid) == 0) {
 345                         /* don't replicate with ourselves */
 346                         continue;
 347                 }
 348
 349                 invocation_id = samdb_result_guid(res->msgs[i], "invocationID");
 350
 351                 reps = talloc_realloc(mem_ctx, reps, struct repsFromToBlob, count+1);
 352                 NT_STATUS_HAVE_NO_MEMORY(reps);
 353
 354                 ZERO_STRUCT(reps[count]);
 355                 reps[count].version = 1;
 356                 r1 = &reps[count].ctr.ctr1;
 357
 358                 r1->other_info               = talloc_zero(reps, struct repsFromTo1OtherInfo);
 359                 r1->other_info->dns_name     = talloc_asprintf(r1->other_info, "%s._msdcs.%s",
 360                                                                GUID_string(mem_ctx, &ntds_guid),
 361                                                                lpcfg_dnsdomain(s->task->lp_ctx));
 362                 r1->source_dsa_obj_guid      = ntds_guid;
 363                 r1->source_dsa_invocation_id = invocation_id;
 364                 r1->replica_flags = kccsrv_replica_flags(s);
 365                 memset(r1->schedule, 0x11, sizeof(r1->schedule));
 366
 367                 dsa_conn->servers = talloc_realloc(dsa_conn, dsa_conn->servers,
 368                                                   struct kcc_connection,
 369                                                   dsa_conn->count + 1);
 370                 NT_STATUS_HAVE_NO_MEMORY(dsa_conn->servers);
 371                 dsa_conn->servers[dsa_conn->count].dsa_guid = r1->source_dsa_obj_guid;
 372                 dsa_conn->count++;
 373
 374                 count++;
 375         }
 376
 377         kccsrv_apply_connections(s, ntds_conn, dsa_conn);
 378
 379         return kccsrv_add_repsFrom(s, mem_ctx, reps, count, res);
 380 }
 381
 382
 383 static void kccsrv_periodic_run(struct kccsrv_service *service);
 384
 385 static void kccsrv_periodic_handler_te(struct tevent_context *ev, struct tevent_timer *te,
 386                                          struct timeval t, void *ptr)
 387 {
 388         struct kccsrv_service *service = talloc_get_type(ptr, struct kccsrv_service);
 389         WERROR status;
 390
 391         service->periodic.te = NULL;
 392
 393         kccsrv_periodic_run(service);
 394
 395         status = kccsrv_periodic_schedule(service, service->periodic.interval);
 396         if (!W_ERROR_IS_OK(status)) {
 397                 task_server_terminate(service->task, win_errstr(status), true);
 398                 return;
 399         }
 400 }
 401
 402 WERROR kccsrv_periodic_schedule(struct kccsrv_service *service, uint32_t next_interval)
 403 {
 404         TALLOC_CTX *tmp_mem;
 405         struct tevent_timer *new_te;
 406         struct timeval next_time;
 407
 408         /* prevent looping */
 409         if (next_interval == 0) next_interval = 1;
 410
 411         next_time = timeval_current_ofs(next_interval, 50);
 412
 413         if (service->periodic.te) {
 414                 /*
 415                  * if the timestamp of the new event is higher,
 416                  * as current next we don't need to reschedule
 417                  */
 418                 if (timeval_compare(&next_time, &service->periodic.next_event) > 0) {
 419                         return WERR_OK;
 420                 }
 421         }
 422
 423         /* reset the next scheduled timestamp */
 424         service->periodic.next_event = next_time;
 425
 426         new_te = event_add_timed(service->task->event_ctx, service,
 427                                  service->periodic.next_event,
 428                                  kccsrv_periodic_handler_te, service);
 429         W_ERROR_HAVE_NO_MEMORY(new_te);
 430
 431         tmp_mem = talloc_new(service);
 432         DEBUG(4,("kccsrv_periodic_schedule(%u) %sscheduled for: %s\n",
 433                 next_interval,
 434                 (service->periodic.te?"re":""),
 435                 nt_time_string(tmp_mem, timeval_to_nttime(&next_time))));
 436         talloc_free(tmp_mem);
 437
 438         talloc_free(service->periodic.te);
 439         service->periodic.te = new_te;
 440
 441         return WERR_OK;
 442 }
 443
 444 static void kccsrv_periodic_run(struct kccsrv_service *service)
 445 {
 446         TALLOC_CTX *mem_ctx;
 447         NTSTATUS status;
 448
 449         DEBUG(4,("kccsrv_periodic_run(): simple update\n"));
 450
 451         mem_ctx = talloc_new(service);
 452         status = kccsrv_simple_update(service, mem_ctx);
 453         if (!NT_STATUS_IS_OK(status)) {
 454                 DEBUG(0,("kccsrv_simple_update failed - %s\n", nt_errstr(status)));
 455         }
 456
 457         status = kccsrv_check_deleted(service, mem_ctx);
 458         if (!NT_STATUS_IS_OK(status)) {
 459                 DEBUG(0,("kccsrv_check_deleted failed - %s\n", nt_errstr(status)));
 460         }
 461         talloc_free(mem_ctx);
 462 }