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