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                 /* add any new ones */
  79                 for (i=0; i<count; i++) {
  80                         if (!reps_in_list(&reps[i], old_reps, old_count)) {
  81                                 old_reps = talloc_realloc(mem_ctx, old_reps, struct repsFromToBlob, old_count+1);
  82                                 NT_STATUS_HAVE_NO_MEMORY(old_reps);
  83                                 old_reps[old_count] = reps[i];
  84                                 old_count++;
  85                                 modified = true;
  86                         }
  87                 }
  88
  89                 /* remove any stale ones */
  90                 for (i=0; i<old_count; i++) {
  91                         if (!reps_in_list(&old_reps[i], reps, count)) {
  92                                 memmove(&old_reps[i], &old_reps[i+1], (old_count-(i+1))*sizeof(old_reps[0]));
  93                                 old_count--;
  94                                 i--;
  95                                 modified = true;
  96                         }
  97                 }
  98
  99                 if (modified) {
 100                         werr = dsdb_savereps(s->samdb, mem_ctx, p->dn, "repsFrom", old_reps, old_count);
 101                         if (!W_ERROR_IS_OK(werr)) {
 102                                 DEBUG(0,(__location__ ": Failed to save repsFrom to %s - %s\n",
 103                                          ldb_dn_get_linearized(p->dn), ldb_errstring(s->samdb)));
 104                                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 105                         }
 106                 }
 107         }
 108
 109         return NT_STATUS_OK;
 110
 111 }
 112
 113 /*
 114   this is the core of our initial simple KCC
 115   We just add a repsFrom entry for all DCs we find that have nTDSDSA
 116   objects, except for ourselves
 117  */
 118 static NTSTATUS kccsrv_simple_update(struct kccsrv_service *s, TALLOC_CTX *mem_ctx)
 119 {
 120         struct ldb_result *res;
 121         int ret, i;
 122         const char *attrs[] = { "objectGUID", "invocationID", NULL };
 123         struct repsFromToBlob *reps = NULL;
 124         uint32_t count = 0;
 125
 126         ret = ldb_search(s->samdb, mem_ctx, &res, s->config_dn, LDB_SCOPE_SUBTREE,
 127                          attrs, "objectClass=nTDSDSA");
 128         if (ret != LDB_SUCCESS) {
 129                 DEBUG(0,(__location__ ": Failed nTDSDSA search - %s\n", ldb_errstring(s->samdb)));
 130                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 131         }
 132
 133         for (i=0; i<res->count; i++) {
 134                 struct repsFromTo1 *r1;
 135                 struct repsFromTo1OtherInfo oi;
 136                 struct GUID ntds_guid, invocation_id;
 137
 138                 ntds_guid = samdb_result_guid(res->msgs[i], "objectGUID");
 139                 if (GUID_compare(&ntds_guid, &s->ntds_guid) == 0) {
 140                         /* don't replicate with ourselves */
 141                         continue;
 142                 }
 143
 144                 invocation_id = samdb_result_guid(res->msgs[i], "invocationID");
 145
 146                 reps = talloc_realloc(mem_ctx, reps, struct repsFromToBlob, count+1);
 147                 NT_STATUS_HAVE_NO_MEMORY(reps);
 148
 149                 ZERO_STRUCT(reps[count]);
 150                 ZERO_STRUCT(oi);
 151                 reps[count].version = 1;
 152                 r1 = &reps[count].ctr.ctr1;
 153
 154                 oi.dns_name                  = talloc_asprintf(mem_ctx, "%s._msdcs.%s",
 155                                                                GUID_string(mem_ctx, &ntds_guid),
 156                                                                lp_realm(s->task->lp_ctx));
 157                 r1->other_info               = &oi;
 158                 r1->source_dsa_obj_guid      = ntds_guid;
 159                 r1->source_dsa_invocation_id = invocation_id;
 160                 r1->replica_flags            =
 161                         DRSUAPI_DS_REPLICA_NEIGHBOUR_WRITEABLE |
 162                         DRSUAPI_DS_REPLICA_NEIGHBOUR_SYNC_ON_STARTUP |
 163                         DRSUAPI_DS_REPLICA_NEIGHBOUR_DO_SCHEDULED_SYNCS;
 164                 memset(r1->schedule, 0x11, sizeof(r1->schedule));
 165                 count++;
 166         }
 167
 168         return kccsrv_add_repsFrom(s, mem_ctx, reps, count);
 169 }
 170
 171
 172 static void kccsrv_periodic_run(struct kccsrv_service *service);
 173
 174 static void kccsrv_periodic_handler_te(struct tevent_context *ev, struct tevent_timer *te,
 175                                          struct timeval t, void *ptr)
 176 {
 177         struct kccsrv_service *service = talloc_get_type(ptr, struct kccsrv_service);
 178         WERROR status;
 179
 180         service->periodic.te = NULL;
 181
 182         kccsrv_periodic_run(service);
 183
 184         status = kccsrv_periodic_schedule(service, service->periodic.interval);
 185         if (!W_ERROR_IS_OK(status)) {
 186                 task_server_terminate(service->task, win_errstr(status), true);
 187                 return;
 188         }
 189 }
 190
 191 WERROR kccsrv_periodic_schedule(struct kccsrv_service *service, uint32_t next_interval)
 192 {
 193         TALLOC_CTX *tmp_mem;
 194         struct tevent_timer *new_te;
 195         struct timeval next_time;
 196
 197         /* prevent looping */
 198         if (next_interval == 0) next_interval = 1;
 199
 200         next_time = timeval_current_ofs(next_interval, 50);
 201
 202         if (service->periodic.te) {
 203                 /*
 204                  * if the timestamp of the new event is higher,
 205                  * as current next we don't need to reschedule
 206                  */
 207                 if (timeval_compare(&next_time, &service->periodic.next_event) > 0) {
 208                         return WERR_OK;
 209                 }
 210         }
 211
 212         /* reset the next scheduled timestamp */
 213         service->periodic.next_event = next_time;
 214
 215         new_te = event_add_timed(service->task->event_ctx, service,
 216                                  service->periodic.next_event,
 217                                  kccsrv_periodic_handler_te, service);
 218         W_ERROR_HAVE_NO_MEMORY(new_te);
 219
 220         tmp_mem = talloc_new(service);
 221         DEBUG(2,("kccsrv_periodic_schedule(%u) %sscheduled for: %s\n",
 222                 next_interval,
 223                 (service->periodic.te?"re":""),
 224                 nt_time_string(tmp_mem, timeval_to_nttime(&next_time))));
 225         talloc_free(tmp_mem);
 226
 227         talloc_free(service->periodic.te);
 228         service->periodic.te = new_te;
 229
 230         return WERR_OK;
 231 }
 232
 233 static void kccsrv_periodic_run(struct kccsrv_service *service)
 234 {
 235         TALLOC_CTX *mem_ctx;
 236         NTSTATUS status;
 237
 238         DEBUG(2,("kccsrv_periodic_run(): simple update\n"));
 239
 240         mem_ctx = talloc_new(service);
 241         status = kccsrv_simple_update(service, mem_ctx);
 242         if (!NT_STATUS_IS_OK(status)) {
 243                 DEBUG(0,("kccsrv_simple_update failed - %s\n", nt_errstr(status)));
 244         }
 245         talloc_free(mem_ctx);
 246 }