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_service.h"
  30 #include "lib/ldb/include/ldb_errors.h"
  31 #include "../lib/util/dlinklist.h"
  32 #include "librpc/gen_ndr/ndr_misc.h"
  33 #include "librpc/gen_ndr/ndr_drsuapi.h"
  34 #include "librpc/gen_ndr/ndr_drsblobs.h"
  35 #include "param/param.h"
  36
  37 /*
  38  * see if a repsFromToBlob is in a list
  39  */
  40 static bool reps_in_list(struct repsFromToBlob *r, struct repsFromToBlob *reps, uint32_t count)
  41 {
  42         int i;
  43         for (i=0; i<count; i++) {
  44                 if (strcmp(r->ctr.ctr1.other_info->dns_name,
  45                            reps[i].ctr.ctr1.other_info->dns_name) == 0 &&
  46                     GUID_compare(&r->ctr.ctr1.source_dsa_obj_guid,
  47                                  &reps[i].ctr.ctr1.source_dsa_obj_guid) == 0) {
  48                         return true;
  49                 }
  50         }
  51         return false;
  52 }
  53
  54
  55 /*
  56  * add any missing repsFrom structures to our partitions
  57  */
  58 static NTSTATUS kccsrv_add_repsFrom(struct kccsrv_service *s, TALLOC_CTX *mem_ctx,
  59                                     struct repsFromToBlob *reps, uint32_t count)
  60 {
  61         struct kccsrv_partition *p;
  62
  63         /* update the repsFrom on all partitions */
  64         for (p=s->partitions; p; p=p->next) {
  65                 struct repsFromToBlob *old_reps;
  66                 uint32_t old_count;
  67                 WERROR werr;
  68                 int i;
  69                 bool modified = false;
  70
  71                 werr = dsdb_loadreps(s->samdb, mem_ctx, p->dn, "repsFrom", &old_reps, &old_count);
  72                 if (!W_ERROR_IS_OK(werr)) {
  73                         DEBUG(0,(__location__ ": Failed to load repsFrom from %s - %s\n",
  74                                  ldb_dn_get_linearized(p->dn), ldb_errstring(s->samdb)));
  75                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
  76                 }
  77
  78                 for (i=0; i<count; i++) {
  79                         if (!reps_in_list(&reps[i], old_reps, old_count)) {
  80                                 old_reps = talloc_realloc(mem_ctx, old_reps, struct repsFromToBlob, old_count+1);
  81                                 NT_STATUS_HAVE_NO_MEMORY(old_reps);
  82                                 old_reps[old_count] = reps[i];
  83                                 old_count++;
  84                                 modified = true;
  85                         }
  86                 }
  87
  88                 if (modified) {
  89                         werr = dsdb_savereps(s->samdb, mem_ctx, p->dn, "repsFrom", old_reps, old_count);
  90                         if (!W_ERROR_IS_OK(werr)) {
  91                                 DEBUG(0,(__location__ ": Failed to save repsFrom to %s - %s\n",
  92                                          ldb_dn_get_linearized(p->dn), ldb_errstring(s->samdb)));
  93                                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
  94                         }
  95                 }
  96         }
  97
  98         return NT_STATUS_OK;
  99
 100 }
 101
 102 /*
 103   this is the core of our initial simple KCC
 104   We just add a repsFrom entry for all DCs we find that have nTDSDSA
 105   objects, except for ourselves
 106  */
 107 static NTSTATUS kccsrv_simple_update(struct kccsrv_service *s, TALLOC_CTX *mem_ctx)
 108 {
 109         struct ldb_result *res;
 110         int ret, i;
 111         const char *attrs[] = { "objectGUID", "invocationID", NULL };
 112         struct repsFromToBlob *reps = NULL;
 113         uint32_t count = 0;
 114
 115         ret = ldb_search(s->samdb, mem_ctx, &res, s->config_dn, LDB_SCOPE_SUBTREE,
 116                          attrs, "objectClass=nTDSDSA");
 117         if (ret != LDB_SUCCESS) {
 118                 DEBUG(0,(__location__ ": Failed nTDSDSA search - %s\n", ldb_errstring(s->samdb)));
 119                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 120         }
 121
 122         for (i=0; i<res->count; i++) {
 123                 struct repsFromTo1 *r1;
 124                 struct repsFromTo1OtherInfo oi;
 125                 struct GUID ntds_guid, invocation_id;
 126
 127                 ntds_guid = samdb_result_guid(res->msgs[i], "objectGUID");
 128                 if (GUID_compare(&ntds_guid, &s->ntds_guid) == 0) {
 129                         /* don't replicate with ourselves */
 130                         continue;
 131                 }
 132
 133                 invocation_id = samdb_result_guid(res->msgs[i], "invocationID");
 134
 135                 reps = talloc_realloc(mem_ctx, reps, struct repsFromToBlob, count+1);
 136                 NT_STATUS_HAVE_NO_MEMORY(reps);
 137
 138                 ZERO_STRUCT(reps[count]);
 139                 ZERO_STRUCT(oi);
 140                 reps[count].version = 1;
 141                 r1 = &reps[count].ctr.ctr1;
 142
 143                 oi.dns_name                  = talloc_asprintf(mem_ctx, "%s._msdcs.%s",
 144                                                                GUID_string(mem_ctx, &ntds_guid),
 145                                                                lp_realm(s->task->lp_ctx));
 146                 r1->other_info               = &oi;
 147                 r1->source_dsa_obj_guid      = ntds_guid;
 148                 r1->source_dsa_invocation_id = invocation_id;
 149                 r1->replica_flags            =
 150                         DRSUAPI_DS_REPLICA_NEIGHBOUR_WRITEABLE |
 151                         DRSUAPI_DS_REPLICA_NEIGHBOUR_SYNC_ON_STARTUP |
 152                         DRSUAPI_DS_REPLICA_NEIGHBOUR_DO_SCHEDULED_SYNCS;
 153                 memset(r1->schedule, 0x11, sizeof(r1->schedule));
 154                 count++;
 155         }
 156
 157         return kccsrv_add_repsFrom(s, mem_ctx, reps, count);
 158 }
 159
 160
 161 static void kccsrv_periodic_run(struct kccsrv_service *service);
 162
 163 static void kccsrv_periodic_handler_te(struct tevent_context *ev, struct tevent_timer *te,
 164                                          struct timeval t, void *ptr)
 165 {
 166         struct kccsrv_service *service = talloc_get_type(ptr, struct kccsrv_service);
 167         WERROR status;
 168
 169         service->periodic.te = NULL;
 170
 171         kccsrv_periodic_run(service);
 172
 173         status = kccsrv_periodic_schedule(service, service->periodic.interval);
 174         if (!W_ERROR_IS_OK(status)) {
 175                 task_server_terminate(service->task, win_errstr(status));
 176                 return;
 177         }
 178 }
 179
 180 WERROR kccsrv_periodic_schedule(struct kccsrv_service *service, uint32_t next_interval)
 181 {
 182         TALLOC_CTX *tmp_mem;
 183         struct tevent_timer *new_te;
 184         struct timeval next_time;
 185
 186         /* prevent looping */
 187         if (next_interval == 0) next_interval = 1;
 188
 189         next_time = timeval_current_ofs(next_interval, 50);
 190
 191         if (service->periodic.te) {
 192                 /*
 193                  * if the timestamp of the new event is higher,
 194                  * as current next we don't need to reschedule
 195                  */
 196                 if (timeval_compare(&next_time, &service->periodic.next_event) > 0) {
 197                         return WERR_OK;
 198                 }
 199         }
 200
 201         /* reset the next scheduled timestamp */
 202         service->periodic.next_event = next_time;
 203
 204         new_te = event_add_timed(service->task->event_ctx, service,
 205                                  service->periodic.next_event,
 206                                  kccsrv_periodic_handler_te, service);
 207         W_ERROR_HAVE_NO_MEMORY(new_te);
 208
 209         tmp_mem = talloc_new(service);
 210         DEBUG(2,("kccsrv_periodic_schedule(%u) %sscheduled for: %s\n",
 211                 next_interval,
 212                 (service->periodic.te?"re":""),
 213                 nt_time_string(tmp_mem, timeval_to_nttime(&next_time))));
 214         talloc_free(tmp_mem);
 215
 216         talloc_free(service->periodic.te);
 217         service->periodic.te = new_te;
 218
 219         return WERR_OK;
 220 }
 221
 222 static void kccsrv_periodic_run(struct kccsrv_service *service)
 223 {
 224         TALLOC_CTX *mem_ctx;
 225         NTSTATUS status;
 226
 227         DEBUG(2,("kccsrv_periodic_run(): simple update\n"));
 228
 229         mem_ctx = talloc_new(service);
 230         status = kccsrv_simple_update(service, mem_ctx);
 231         if (!NT_STATUS_IS_OK(status)) {
 232                 DEBUG(0,("kccsrv_simple_update failed - %s\n", nt_errstr(status)));
 233         }
 234         talloc_free(mem_ctx);
 235 }