source4/dsdb/kcc/kcc_deleted.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    handle removal of deleted objects
   5
   6    Copyright (C) 2009 Andrew Tridgell
   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 <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 #include "dsdb/common/util.h"
  38
  39 /*
  40   check to see if any deleted objects need scavenging
  41  */
  42 NTSTATUS kccsrv_check_deleted(struct kccsrv_service *s, TALLOC_CTX *mem_ctx)
  43 {
  44         struct kccsrv_partition *part;
  45         int ret;
  46         uint32_t tombstoneLifetime;
  47         bool do_fs = false;
  48
  49         time_t interval = lpcfg_parm_int(s->task->lp_ctx, NULL, "kccsrv",
  50                                                     "check_deleted_full_scan_interval", 86400);
  51         time_t t = time(NULL);
  52
  53         if (t - s->last_deleted_check < lpcfg_parm_int(s->task->lp_ctx, NULL, "kccsrv",
  54                                                     "check_deleted_interval", 600)) {
  55                 return NT_STATUS_OK;
  56         }
  57         s->last_deleted_check = t;
  58
  59         ret = dsdb_tombstone_lifetime(s->samdb, &tombstoneLifetime);
  60         if (ret != LDB_SUCCESS) {
  61                 DEBUG(1,(__location__ ": Failed to get tombstone lifetime\n"));
  62                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
  63         }
  64         if (s->last_full_scan_deleted_check > 0 && ((t - s->last_full_scan_deleted_check) > interval )) {
  65                 do_fs = true;
  66                 s->last_full_scan_deleted_check = t;
  67         }
  68
  69         if (s->last_full_scan_deleted_check == 0) {
  70                 /*
  71                  * If we never made a full scan set the last full scan event to be in the past
  72                  * and that 9/10 of the full scan interval has already passed.
  73                  * This is done to avoid the full scan to fire just at the begining of samba
  74                  * or a couple of minutes after the start.
  75                  * With this "setup" and default values of interval, the full scan will fire
  76                  * 2.4 hours after the start of samba
  77                  */
  78                 s->last_full_scan_deleted_check = t - ((9 * interval) / 10);
  79         }
  80
  81         for (part=s->partitions; part; part=part->next) {
  82                 struct ldb_dn *do_dn;
  83                 struct ldb_result *res;
  84                 const char *attrs[] = { "whenChanged", NULL };
  85                 unsigned int i;
  86
  87                 ret = dsdb_get_deleted_objects_dn(s->samdb, mem_ctx, part->dn, &do_dn);
  88                 if (ret != LDB_SUCCESS) {
  89                         /* some partitions have no Deleted Objects
  90                            container */
  91                         continue;
  92                 }
  93
  94                 if (!do_fs && ldb_dn_compare(ldb_get_config_basedn(s->samdb), part->dn)) {
  95                         ret = dsdb_search(s->samdb, do_dn, &res, do_dn, LDB_SCOPE_ONELEVEL, attrs,
  96                                         DSDB_SEARCH_SHOW_RECYCLED, NULL);
  97                 } else {
  98                         if (do_fs) {
  99                                 DEBUG(1, ("Doing a full scan on %s and looking for deleted object\n",
 100                                                 ldb_dn_get_linearized(part->dn)));
 101                         }
 102                         ret = dsdb_search(s->samdb, part->dn, &res, part->dn, LDB_SCOPE_SUBTREE, attrs,
 103                                         DSDB_SEARCH_SHOW_RECYCLED, "(isDeleted=TRUE)");
 104                 }
 105
 106                 if (ret != LDB_SUCCESS) {
 107                         DEBUG(1,(__location__ ": Failed to search for deleted objects in %s\n",
 108                                  ldb_dn_get_linearized(do_dn)));
 109                         talloc_free(do_dn);
 110                         continue;
 111                 }
 112
 113                 for (i=0; i<res->count; i++) {
 114                         const char *tstring;
 115                         time_t whenChanged = 0;
 116
 117                         if (ldb_dn_compare(do_dn, res->msgs[i]->dn) == 0) {
 118                                 /* Skip the Deleted Object Container */
 119                                 continue;
 120                         }
 121                         tstring = ldb_msg_find_attr_as_string(res->msgs[i], "whenChanged", NULL);
 122                         if (tstring) {
 123                                 whenChanged = ldb_string_to_time(tstring);
 124                         }
 125                         if (t - whenChanged > tombstoneLifetime*60*60*24) {
 126                                 ret = dsdb_delete(s->samdb, res->msgs[i]->dn, DSDB_SEARCH_SHOW_DELETED);
 127                                 if (ret != LDB_SUCCESS) {
 128                                         DEBUG(1,(__location__ ": Failed to remove deleted object %s\n",
 129                                                  ldb_dn_get_linearized(res->msgs[i]->dn)));
 130                                 } else {
 131                                         DEBUG(4,("Removed deleted object %s\n",
 132                                                  ldb_dn_get_linearized(res->msgs[i]->dn)));
 133                                 }
 134                         }
 135                 }
 136
 137                 talloc_free(do_dn);
 138         }
 139
 140         return NT_STATUS_OK;
 141 }