source4/dsdb/samdb/ldb_modules/samba_secrets.c

   1 /*
   2    Samba4 module loading module (for secrets)
   3
   4    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2009
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 /*
  21  *  Name: ldb
  22  *
  23  *  Component: Samba4 module loading module (for secrets.ldb)
  24  *
  25  *  Description: Implement a single 'module' in the secrets.ldb database
  26  *
  27  *  This is to avoid forcing a reprovision of the ldb databases when we change the internal structure of the code
  28  *
  29  *  Author: Andrew Bartlett
  30  */
  31
  32 #include "includes.h"
  33 #include <ldb.h>
  34 #include <ldb_errors.h>
  35 #include <ldb_module.h>
  36 #include "dsdb/samdb/ldb_modules/util.h"
  37 #include "dsdb/samdb/samdb.h"
  38
  39
  40 static int samba_secrets_init(struct ldb_module *module)
  41 {
  42         struct ldb_context *ldb = ldb_module_get_ctx(module);
  43         int ret, len, i;
  44         TALLOC_CTX *tmp_ctx = talloc_new(module);
  45         struct ldb_module *backend_module, *module_chain;
  46         const char **reverse_module_list;
  47         /*
  48           Add modules to the list to activate them by default
  49           beware often order is important
  50
  51           The list is presented here as a set of declarations to show the
  52           stack visually
  53         */
  54         static const char *modules_list[] = {"update_keytab",
  55                                              "objectguid",
  56                                              "rdn_name",
  57                                              NULL };
  58
  59         if (!tmp_ctx) {
  60                 return ldb_oom(ldb);
  61         }
  62
  63         /* Now prepare the module chain.  Oddly, we must give it to ldb_load_modules_list in REVERSE */
  64         for (len = 0; modules_list[len]; len++) { /* noop */};
  65
  66         reverse_module_list = talloc_array(tmp_ctx, const char *, len+1);
  67         if (!reverse_module_list) {
  68                 talloc_free(tmp_ctx);
  69                 return ldb_oom(ldb);
  70         }
  71         for (i=0; i < len; i++) {
  72                 reverse_module_list[i] = modules_list[(len - 1) - i];
  73         }
  74         reverse_module_list[i] = NULL;
  75
  76         /* The backend (at least until the partitions module
  77          * reconfigures things) is the next module in the currently
  78          * loaded chain */
  79         backend_module = ldb_module_next(module);
  80         ret = ldb_module_load_list(ldb, reverse_module_list, backend_module, &module_chain);
  81         if (ret != LDB_SUCCESS) {
  82                 talloc_free(tmp_ctx);
  83                 return ret;
  84         }
  85
  86         talloc_free(tmp_ctx);
  87         /* Set this as the 'next' module, so that we effectivly append it to module chain */
  88         ldb_module_set_next(module, module_chain);
  89
  90         return ldb_next_init(module);
  91 }
  92
  93 static const struct ldb_module_ops ldb_samba_secrets_module_ops = {
  94         .name              = "samba_secrets",
  95         .init_context      = samba_secrets_init,
  96 };
  97
  98 int ldb_samba_secrets_module_init(const char *version)
  99 {
 100         LDB_MODULE_CHECK_VERSION(version);
 101         return ldb_register_module(&ldb_samba_secrets_module_ops);
 102 }