source4/dsdb/samdb/ldb_modules/schema_fsmo.c

   1 /*
   2    Unix SMB/CIFS mplementation.
   3
   4    The module that handles the Schema FSMO Role Owner
   5    checkings, it also loads the dsdb_schema.
   6
   7    Copyright (C) Stefan Metzmacher <metze@samba.org> 2007
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22
  23 */
  24
  25 #include "includes.h"
  26 #include "lib/ldb/include/ldb.h"
  27 #include "lib/ldb/include/ldb_errors.h"
  28 #include "lib/ldb/include/ldb_private.h"
  29 #include "dsdb/samdb/samdb.h"
  30 #include "librpc/gen_ndr/ndr_misc.h"
  31 #include "librpc/gen_ndr/ndr_drsuapi.h"
  32 #include "librpc/gen_ndr/ndr_drsblobs.h"
  33 #include "lib/util/dlinklist.h"
  34
  35 static int schema_fsmo_init(struct ldb_module *module)
  36 {
  37         WERROR status;
  38         TALLOC_CTX *mem_ctx;
  39         struct ldb_dn *schema_dn;
  40         struct dsdb_schema *schema;
  41         struct dsdb_schema_fsmo *schema_fsmo;
  42         struct ldb_result *schema_res;
  43         const struct ldb_val *prefix_val;
  44         const struct ldb_val *info_val;
  45         struct ldb_val info_val_default;
  46         struct ldb_result *a_res;
  47         struct ldb_result *c_res;
  48         uint32_t i;
  49         int ret;
  50         static const char *schema_attrs[] = {
  51                 "prefixMap",
  52                 "schemaInfo",
  53                 "fSMORoleOwner",
  54                 NULL
  55         };
  56
  57         schema_dn = samdb_schema_dn(module->ldb);
  58         if (!schema_dn) {
  59                 ldb_debug(module->ldb, LDB_DEBUG_WARNING,
  60                           "schema_fsmo_init: no schema dn present: (skip schema loading)\n");
  61                 return ldb_next_init(module);
  62         }
  63
  64         mem_ctx = talloc_new(module);
  65         if (!mem_ctx) {
  66                 ldb_oom(module->ldb);
  67                 return LDB_ERR_OPERATIONS_ERROR;
  68         }
  69
  70         schema_fsmo = talloc_zero(mem_ctx, struct dsdb_schema_fsmo);
  71         if (!schema_fsmo) {
  72                 ldb_oom(module->ldb);
  73                 return LDB_ERR_OPERATIONS_ERROR;
  74         }
  75         module->private_data = schema_fsmo;
  76
  77         schema = talloc_zero(mem_ctx, struct dsdb_schema);
  78         if (!schema) {
  79                 ldb_oom(module->ldb);
  80                 return LDB_ERR_OPERATIONS_ERROR;
  81         }
  82
  83         /*
  84          * setup the prefix mappings and schema info
  85          */
  86         ret = ldb_search(module->ldb, schema_dn,
  87                          LDB_SCOPE_BASE,
  88                          NULL, schema_attrs,
  89                          &schema_res);
  90         if (ret != LDB_SUCCESS) {
  91                 ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
  92                               "schema_fsmo_init: failed to search the schema head: %d:%s\n",
  93                               ret, ldb_strerror(ret));
  94                 talloc_free(mem_ctx);
  95                 return ret;
  96         }
  97         talloc_steal(mem_ctx, schema_res);
  98         if (schema_res->count == 0) {
  99                 ldb_debug(module->ldb, LDB_DEBUG_WARNING,
 100                           "schema_fsmo_init: no schema head present: (skip schema loading)\n");
 101                 talloc_free(mem_ctx);
 102                 return ldb_next_init(module);
 103         } else if (schema_res->count > 1) {
 104                 ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
 105                               "schema_fsmo_init: [%u] schema heads found on a base search\n",
 106                               schema_res->count);
 107                 talloc_free(mem_ctx);
 108                 return LDB_ERR_CONSTRAINT_VIOLATION;
 109         }
 110
 111         prefix_val = ldb_msg_find_ldb_val(schema_res->msgs[0], "prefixMap");
 112         if (!prefix_val) {
 113                 ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
 114                               "schema_fsmo_init: no prefixMap attribute found\n");
 115                 talloc_free(mem_ctx);
 116                 return LDB_ERR_CONSTRAINT_VIOLATION;
 117         }
 118         info_val = ldb_msg_find_ldb_val(schema_res->msgs[0], "schemaInfo");
 119         if (!info_val) {
 120                 info_val_default = strhex_to_data_blob("FF0000000000000000000000000000000000000000");
 121                 if (!info_val_default.data) {
 122                         ldb_oom(module->ldb);
 123                         return LDB_ERR_OPERATIONS_ERROR;
 124                 }
 125                 talloc_steal(mem_ctx, info_val_default.data);
 126                 info_val = &info_val_default;
 127         }
 128
 129         status = dsdb_load_oid_mappings_ldb(schema, prefix_val, info_val);
 130         if (!W_ERROR_IS_OK(status)) {
 131                 ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
 132                               "schema_fsmo_init: failed to load oid mappings: %s\n",
 133                               win_errstr(status));
 134                 talloc_free(mem_ctx);
 135                 return LDB_ERR_CONSTRAINT_VIOLATION;
 136         }
 137
 138         /*
 139          * load the attribute definitions
 140          */
 141         ret = ldb_search(module->ldb, schema_dn,
 142                          LDB_SCOPE_ONELEVEL,
 143                          "(objectClass=attributeSchema)", NULL,
 144                          &a_res);
 145         if (ret != LDB_SUCCESS) {
 146                 ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
 147                               "schema_fsmo_init: failed to search attributeSchema objects: %d:%s\n",
 148                               ret, ldb_strerror(ret));
 149                 talloc_free(mem_ctx);
 150                 return ret;
 151         }
 152         talloc_steal(mem_ctx, a_res);
 153
 154         for (i=0; i < a_res->count; i++) {
 155                 struct dsdb_attribute *sa;
 156
 157                 sa = talloc_zero(schema, struct dsdb_attribute);
 158                 if (!sa) {
 159                         ldb_oom(module->ldb);
 160                         return LDB_ERR_OPERATIONS_ERROR;
 161                 }
 162
 163                 status = dsdb_attribute_from_ldb(schema, a_res->msgs[i], sa, sa);
 164                 if (!W_ERROR_IS_OK(status)) {
 165                         ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
 166                                       "schema_fsmo_init: failed to load attriute definition: %s:%s\n",
 167                                       ldb_dn_get_linearized(a_res->msgs[i]->dn),
 168                                       win_errstr(status));
 169                         talloc_free(mem_ctx);
 170                         return LDB_ERR_CONSTRAINT_VIOLATION;
 171                 }
 172
 173                 DLIST_ADD_END(schema->attributes, sa, struct dsdb_attribute *);
 174         }
 175         talloc_free(a_res);
 176
 177         /*
 178          * load the objectClass definitions
 179          */
 180         ret = ldb_search(module->ldb, schema_dn,
 181                          LDB_SCOPE_ONELEVEL,
 182                          "(objectClass=classSchema)", NULL,
 183                          &c_res);
 184         if (ret != LDB_SUCCESS) {
 185                 ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
 186                               "schema_fsmo_init: failed to search classSchema objects: %d:%s\n",
 187                               ret, ldb_strerror(ret));
 188                 talloc_free(mem_ctx);
 189                 return ret;
 190         }
 191         talloc_steal(mem_ctx, c_res);
 192
 193         for (i=0; i < c_res->count; i++) {
 194                 struct dsdb_class *sc;
 195
 196                 sc = talloc_zero(schema, struct dsdb_class);
 197                 if (!sc) {
 198                         ldb_oom(module->ldb);
 199                         return LDB_ERR_OPERATIONS_ERROR;
 200                 }
 201
 202                 status = dsdb_class_from_ldb(schema, c_res->msgs[i], sc, sc);
 203                 if (!W_ERROR_IS_OK(status)) {
 204                         ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
 205                                       "schema_fsmo_init: failed to load class definition: %s:%s\n",
 206                                       ldb_dn_get_linearized(c_res->msgs[i]->dn),
 207                                       win_errstr(status));
 208                         talloc_free(mem_ctx);
 209                         return LDB_ERR_CONSTRAINT_VIOLATION;
 210                 }
 211
 212                 DLIST_ADD_END(schema->classes, sc, struct dsdb_class *);
 213         }
 214         talloc_free(c_res);
 215
 216         /* dsdb_set_schema() steal schema into the ldb_context */
 217         ret = dsdb_set_schema(module->ldb, schema);
 218         if (ret != LDB_SUCCESS) {
 219                 ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
 220                               "schema_fsmo_init: dsdb_set_schema() failed: %d:%s\n",
 221                               ret, ldb_strerror(ret));
 222                 talloc_free(mem_ctx);
 223                 return ret;
 224         }
 225
 226         schema_fsmo->master_dn = ldb_msg_find_attr_as_dn(module->ldb, schema_fsmo, schema_res->msgs[0], "fSMORoleOwner");
 227         if (ldb_dn_compare(samdb_ntds_settings_dn(module->ldb), schema_fsmo->master_dn) == 0) {
 228                 schema_fsmo->we_are_master = true;
 229         } else {
 230                 schema_fsmo->we_are_master = false;
 231         }
 232
 233         if (ldb_set_opaque(module->ldb, "dsdb_schema_fsmo", schema_fsmo) != LDB_SUCCESS) {
 234                 ldb_oom(module->ldb);
 235                 return LDB_ERR_OPERATIONS_ERROR;
 236         }
 237
 238         talloc_steal(module, schema_fsmo);
 239
 240         ldb_debug(module->ldb, LDB_DEBUG_TRACE,
 241                           "schema_fsmo_init: we are master: %s\n",
 242                           (schema_fsmo->we_are_master?"yes":"no"));
 243
 244         talloc_free(mem_ctx);
 245         return ldb_next_init(module);
 246 }
 247
 248 static const struct ldb_module_ops schema_fsmo_ops = {
 249         .name           = "schema_fsmo",
 250         .init_context   = schema_fsmo_init
 251 };
 252
 253 int schema_fsmo_module_init(void)
 254 {
 255         return ldb_register_module(&schema_fsmo_ops);
 256 }