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 "param/param.h"
  37
  38 /*
  39  * see if a repsFromToBlob is in a list
  40  */
  41 static bool reps_in_list(struct repsFromToBlob *r, struct repsFromToBlob *reps, uint32_t count)
  42 {
  43         uint32_t i;
  44         for (i=0; i<count; i++) {
  45                 if (strcmp(r->ctr.ctr1.other_info->dns_name,
  46                            reps[i].ctr.ctr1.other_info->dns_name) == 0 &&
  47                     GUID_compare(&r->ctr.ctr1.source_dsa_obj_guid,
  48                                  &reps[i].ctr.ctr1.source_dsa_obj_guid) == 0) {
  49                         return true;
  50                 }
  51         }
  52         return false;
  53 }
  54
  55 /*
  56   make sure we only add repsFrom entries for DCs who are masters for
  57   the partition
  58  */
  59 static bool check_MasterNC(struct kccsrv_partition *p, struct repsFromToBlob *r,
  60                            struct ldb_result *res)
  61 {
  62         struct repsFromTo1 *r1;
  63         r1 = &r->ctr.ctr1;
  64         struct GUID invocation_id = r1->source_dsa_invocation_id;
  65         int i, j;
  66
  67         for (i=0; i<res->count; i++) {
  68                 struct ldb_message *msg = res->msgs[i];
  69                 struct ldb_message_element *el;
  70                 struct ldb_dn *dn;
  71
  72                 struct GUID id2 = samdb_result_guid(msg, "invocationID");
  73                 if (!GUID_equal(&invocation_id, &id2)) {
  74                         continue;
  75                 }
  76
  77                 el = ldb_msg_find_element(msg, "hasMasterNCs");
  78                 if (!el || el->num_values == 0) {
  79                         continue;
  80                 }
  81                 for (j=0; j<el->num_values; j++) {
  82                         dn = ldb_dn_from_ldb_val(p, p->service->samdb, &el->values[j]);
  83                         if (!ldb_dn_validate(dn)) {
  84                                 talloc_free(dn);
  85                                 continue;
  86                         }
  87                         if (ldb_dn_compare(dn, p->dn) == 0) {
  88                                 talloc_free(dn);
  89                                 return true;
  90                         }
  91                         talloc_free(dn);
  92                 }
  93         }
  94         return false;
  95 }
  96
  97
  98 /*
  99  * add any missing repsFrom structures to our partitions
 100  */
 101 static NTSTATUS kccsrv_add_repsFrom(struct kccsrv_service *s, TALLOC_CTX *mem_ctx,
 102                                     struct repsFromToBlob *reps, uint32_t count,
 103                                     struct ldb_result *res)
 104 {
 105         struct kccsrv_partition *p;
 106
 107         /* update the repsFrom on all partitions */
 108         for (p=s->partitions; p; p=p->next) {
 109                 struct repsFromToBlob *old_reps;
 110                 uint32_t old_count;
 111                 WERROR werr;
 112                 uint32_t i;
 113                 bool modified = false;
 114
 115                 werr = dsdb_loadreps(s->samdb, mem_ctx, p->dn, "repsFrom", &old_reps, &old_count);
 116                 if (!W_ERROR_IS_OK(werr)) {
 117                         DEBUG(0,(__location__ ": Failed to load repsFrom from %s - %s\n",
 118                                  ldb_dn_get_linearized(p->dn), ldb_errstring(s->samdb)));
 119                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
 120                 }
 121
 122                 /* add any new ones */
 123                 for (i=0; i<count; i++) {
 124                         if (!reps_in_list(&reps[i], old_reps, old_count) &&
 125                             check_MasterNC(p, &reps[i], res)) {
 126                                 old_reps = talloc_realloc(mem_ctx, old_reps, struct repsFromToBlob, old_count+1);
 127                                 NT_STATUS_HAVE_NO_MEMORY(old_reps);
 128                                 old_reps[old_count] = reps[i];
 129                                 old_count++;
 130                                 modified = true;
 131                         }
 132                 }
 133
 134                 /* remove any stale ones */
 135                 for (i=0; i<old_count; i++) {
 136                         if (!reps_in_list(&old_reps[i], reps, count) ||
 137                             !check_MasterNC(p, &old_reps[i], res)) {
 138                                 memmove(&old_reps[i], &old_reps[i+1], (old_count-(i+1))*sizeof(old_reps[0]));
 139                                 old_count--;
 140                                 i--;
 141                                 modified = true;
 142                         }
 143                 }
 144
 145                 if (modified) {
 146                         werr = dsdb_savereps(s->samdb, mem_ctx, p->dn, "repsFrom", old_reps, old_count);
 147                         if (!W_ERROR_IS_OK(werr)) {
 148                                 DEBUG(0,(__location__ ": Failed to save repsFrom to %s - %s\n",
 149                                          ldb_dn_get_linearized(p->dn), ldb_errstring(s->samdb)));
 150                                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 151                         }
 152                 }
 153         }
 154
 155         return NT_STATUS_OK;
 156
 157 }
 158
 159 /*
 160   this is the core of our initial simple KCC
 161   We just add a repsFrom entry for all DCs we find that have nTDSDSA
 162   objects, except for ourselves
 163  */
 164 NTSTATUS kccsrv_simple_update(struct kccsrv_service *s, TALLOC_CTX *mem_ctx)
 165 {
 166         struct ldb_result *res;
 167         unsigned int i;
 168         int ret;
 169         const char *attrs[] = { "objectGUID", "invocationID", "hasMasterNCs", NULL };
 170         struct repsFromToBlob *reps = NULL;
 171         uint32_t count = 0;
 172         struct kcc_connection_list *ntds_conn, *dsa_conn;
 173
 174         ret = ldb_search(s->samdb, mem_ctx, &res, s->config_dn, LDB_SCOPE_SUBTREE,
 175                          attrs, "objectClass=nTDSDSA");
 176         if (ret != LDB_SUCCESS) {
 177                 DEBUG(0,(__location__ ": Failed nTDSDSA search - %s\n", ldb_errstring(s->samdb)));
 178                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 179         }
 180
 181         /* get the current list of connections */
 182         ntds_conn = kccsrv_find_connections(s, mem_ctx);
 183
 184         dsa_conn = talloc_zero(mem_ctx, struct kcc_connection_list);
 185
 186         for (i=0; i<res->count; i++) {
 187                 struct repsFromTo1 *r1;
 188                 struct GUID ntds_guid, invocation_id;
 189
 190                 ntds_guid = samdb_result_guid(res->msgs[i], "objectGUID");
 191                 if (GUID_compare(&ntds_guid, &s->ntds_guid) == 0) {
 192                         /* don't replicate with ourselves */
 193                         continue;
 194                 }
 195
 196                 invocation_id = samdb_result_guid(res->msgs[i], "invocationID");
 197
 198                 reps = talloc_realloc(mem_ctx, reps, struct repsFromToBlob, count+1);
 199                 NT_STATUS_HAVE_NO_MEMORY(reps);
 200
 201                 ZERO_STRUCT(reps[count]);
 202                 reps[count].version = 1;
 203                 r1 = &reps[count].ctr.ctr1;
 204
 205                 r1->other_info               = talloc_zero(reps, struct repsFromTo1OtherInfo);
 206                 r1->other_info->dns_name     = talloc_asprintf(r1->other_info, "%s._msdcs.%s",
 207                                                                GUID_string(mem_ctx, &ntds_guid),
 208                                                                lp_dnsdomain(s->task->lp_ctx));
 209                 r1->source_dsa_obj_guid      = ntds_guid;
 210                 r1->source_dsa_invocation_id = invocation_id;
 211                 r1->replica_flags            =
 212                         DRSUAPI_DRS_WRIT_REP |
 213                         DRSUAPI_DRS_INIT_SYNC |
 214                         DRSUAPI_DRS_PER_SYNC;
 215                 memset(r1->schedule, 0x11, sizeof(r1->schedule));
 216
 217                 dsa_conn->servers = talloc_realloc(dsa_conn, dsa_conn->servers,
 218                                                   struct kcc_connection,
 219                                                   dsa_conn->count + 1);
 220                 NT_STATUS_HAVE_NO_MEMORY(dsa_conn->servers);
 221                 dsa_conn->servers[dsa_conn->count].dsa_guid = r1->source_dsa_obj_guid;
 222                 dsa_conn->count++;
 223
 224                 count++;
 225         }
 226
 227         kccsrv_apply_connections(s, ntds_conn, dsa_conn);
 228
 229         return kccsrv_add_repsFrom(s, mem_ctx, reps, count, res);
 230 }
 231
 232
 233 static void kccsrv_periodic_run(struct kccsrv_service *service);
 234
 235 static void kccsrv_periodic_handler_te(struct tevent_context *ev, struct tevent_timer *te,
 236                                          struct timeval t, void *ptr)
 237 {
 238         struct kccsrv_service *service = talloc_get_type(ptr, struct kccsrv_service);
 239         WERROR status;
 240
 241         service->periodic.te = NULL;
 242
 243         kccsrv_periodic_run(service);
 244
 245         status = kccsrv_periodic_schedule(service, service->periodic.interval);
 246         if (!W_ERROR_IS_OK(status)) {
 247                 task_server_terminate(service->task, win_errstr(status), true);
 248                 return;
 249         }
 250 }
 251
 252 WERROR kccsrv_periodic_schedule(struct kccsrv_service *service, uint32_t next_interval)
 253 {
 254         TALLOC_CTX *tmp_mem;
 255         struct tevent_timer *new_te;
 256         struct timeval next_time;
 257
 258         /* prevent looping */
 259         if (next_interval == 0) next_interval = 1;
 260
 261         next_time = timeval_current_ofs(next_interval, 50);
 262
 263         if (service->periodic.te) {
 264                 /*
 265                  * if the timestamp of the new event is higher,
 266                  * as current next we don't need to reschedule
 267                  */
 268                 if (timeval_compare(&next_time, &service->periodic.next_event) > 0) {
 269                         return WERR_OK;
 270                 }
 271         }
 272
 273         /* reset the next scheduled timestamp */
 274         service->periodic.next_event = next_time;
 275
 276         new_te = event_add_timed(service->task->event_ctx, service,
 277                                  service->periodic.next_event,
 278                                  kccsrv_periodic_handler_te, service);
 279         W_ERROR_HAVE_NO_MEMORY(new_te);
 280
 281         tmp_mem = talloc_new(service);
 282         DEBUG(2,("kccsrv_periodic_schedule(%u) %sscheduled for: %s\n",
 283                 next_interval,
 284                 (service->periodic.te?"re":""),
 285                 nt_time_string(tmp_mem, timeval_to_nttime(&next_time))));
 286         talloc_free(tmp_mem);
 287
 288         talloc_free(service->periodic.te);
 289         service->periodic.te = new_te;
 290
 291         return WERR_OK;
 292 }
 293
 294 static void kccsrv_periodic_run(struct kccsrv_service *service)
 295 {
 296         TALLOC_CTX *mem_ctx;
 297         NTSTATUS status;
 298
 299         DEBUG(2,("kccsrv_periodic_run(): simple update\n"));
 300
 301         mem_ctx = talloc_new(service);
 302         status = kccsrv_simple_update(service, mem_ctx);
 303         if (!NT_STATUS_IS_OK(status)) {
 304                 DEBUG(0,("kccsrv_simple_update failed - %s\n", nt_errstr(status)));
 305         }
 306
 307         status = kccsrv_check_deleted(service, mem_ctx);
 308         if (!NT_STATUS_IS_OK(status)) {
 309                 DEBUG(0,("kccsrv_check_deleted failed - %s\n", nt_errstr(status)));
 310         }
 311         talloc_free(mem_ctx);
 312 }