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         const struct dsdb_schema *schema;
  48         bool do_fs = false;
  49         bool add_recycled = false;
  50
  51         time_t t = time(NULL);
  52         if (t - s->last_deleted_check < lpcfg_parm_int(s->task->lp_ctx, NULL, "kccsrv",
  53                                                     "check_deleted_interval", 600)) {
  54                 return NT_STATUS_OK;
  55         }
  56         s->last_deleted_check = t;
  57         DEBUG(11, ("Check deleted has kicked in !\n"));
  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
  65         schema = dsdb_get_schema(s->samdb, mem_ctx);
  66         if (!schema) {
  67                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
  68         }
  69
  70         if (dsdb_attribute_by_lDAPDisplayName(schema, "isRecycled") != NULL) {
  71                 add_recycled = true;
  72         }
  73
  74         for (part=s->partitions; part; part=part->next) {
  75                 struct ldb_dn *do_dn;
  76                 struct ldb_result *res;
  77                 const char *attrs[] = { "whenChanged", "isRecycled", NULL };
  78                 unsigned int i;
  79
  80                 ret = dsdb_get_deleted_objects_dn(s->samdb, mem_ctx, part->dn, &do_dn);
  81                 if (ret != LDB_SUCCESS) {
  82                         /* some partitions have no Deleted Objects
  83                            container */
  84                         continue;
  85                 }
  86                 ret = dsdb_search(s->samdb, do_dn, &res, do_dn, LDB_SCOPE_ONELEVEL, attrs,
  87                                   DSDB_SEARCH_SHOW_RECYCLED, NULL);
  88
  89                 if (ret != LDB_SUCCESS) {
  90                         DEBUG(1,(__location__ ": Failed to search for deleted objects in %s\n",
  91                                  ldb_dn_get_linearized(do_dn)));
  92                         talloc_free(do_dn);
  93                         continue;
  94                 }
  95
  96                 for (i=0; i<res->count; i++) {
  97                         const char *tstring;
  98                         time_t whenChanged = 0;
  99
 100                         if (ldb_dn_compare(do_dn, res->msgs[i]->dn) == 0) {
 101                                 /* Skip the Deleted Object Container */
 102                                 continue;
 103                         }
 104                         tstring = ldb_msg_find_attr_as_string(res->msgs[i], "whenChanged", NULL);
 105                         if (tstring) {
 106                                 whenChanged = ldb_string_to_time(tstring);
 107                         }
 108                         if (t - whenChanged > tombstoneLifetime*60*60*24) {
 109                                 ret = dsdb_delete(s->samdb, res->msgs[i]->dn, DSDB_SEARCH_SHOW_DELETED);
 110                                 if (ret != LDB_SUCCESS) {
 111                                         DEBUG(1,(__location__ ": Failed to remove deleted object %s\n",
 112                                                  ldb_dn_get_linearized(res->msgs[i]->dn)));
 113                                 } else {
 114                                         DEBUG(4,("Removed deleted object %s\n",
 115                                                  ldb_dn_get_linearized(res->msgs[i]->dn)));
 116                                 }
 117                         } else if (add_recycled & !ldb_msg_find_ldb_val(res->msgs[i], "isRecycled")) {
 118                                 /* There is no isRecycled attribute
 119                                  * we used to not set this attribute before
 120                                  * let's set it
 121                                  */
 122
 123                                 DEBUG(1, ("Adding isRecycled\n"));
 124                                 struct ldb_message *msg = ldb_msg_new(mem_ctx);
 125                                 if (msg == NULL) {
 126                                         talloc_free(do_dn);
 127                                         return NT_STATUS_NO_MEMORY;
 128                                 }
 129
 130                                 msg->dn = res->msgs[i]->dn;
 131                                 ret = ldb_msg_add_string(msg, "isRecycled", "TRUE");
 132                                 if (ret != LDB_SUCCESS) {
 133                                         talloc_free(do_dn);
 134                                         return NT_STATUS_NO_MEMORY;
 135                                 }
 136                                 msg->elements[msg->num_elements - 1].flags = LDB_FLAG_MOD_ADD;
 137
 138                                 ret = dsdb_modify(s->samdb, msg, DSDB_SEARCH_SHOW_DELETED);
 139                                 if (ret != LDB_SUCCESS) {
 140                                         talloc_free(do_dn);
 141                                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
 142                                 }
 143                         }
 144                 }
 145
 146                 talloc_free(do_dn);
 147         }
 148
 149         return NT_STATUS_OK;
 150 }