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         if (dsdb_get_schema(module->ldb)) {
  58           return ldb_next_init(module);
  59         }
  60
  61         schema_dn = samdb_schema_dn(module->ldb);
  62         if (!schema_dn) {
  63                 ldb_debug(module->ldb, LDB_DEBUG_WARNING,
  64                           "schema_fsmo_init: no schema dn present: (skip schema loading)\n");
  65                 return ldb_next_init(module);
  66         }
  67
  68         mem_ctx = talloc_new(module);
  69         if (!mem_ctx) {
  70                 ldb_oom(module->ldb);
  71                 return LDB_ERR_OPERATIONS_ERROR;
  72         }
  73
  74         schema_fsmo = talloc_zero(mem_ctx, struct dsdb_schema_fsmo);
  75         if (!schema_fsmo) {
  76                 ldb_oom(module->ldb);
  77                 return LDB_ERR_OPERATIONS_ERROR;
  78         }
  79         module->private_data = schema_fsmo;
  80
  81         schema = talloc_zero(mem_ctx, struct dsdb_schema);
  82         if (!schema) {
  83                 ldb_oom(module->ldb);
  84                 return LDB_ERR_OPERATIONS_ERROR;
  85         }
  86
  87         /*
  88          * setup the prefix mappings and schema info
  89          */
  90         ret = ldb_search(module->ldb, schema_dn,
  91                          LDB_SCOPE_BASE,
  92                          NULL, schema_attrs,
  93                          &schema_res);
  94         if (ret != LDB_SUCCESS) {
  95                 ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
  96                               "schema_fsmo_init: failed to search the schema head: %d:%s\n",
  97                               ret, ldb_strerror(ret));
  98                 talloc_free(mem_ctx);
  99                 return ret;
 100         }
 101         talloc_steal(mem_ctx, schema_res);
 102         if (schema_res->count == 0) {
 103                 ldb_debug(module->ldb, LDB_DEBUG_WARNING,
 104                           "schema_fsmo_init: no schema head present: (skip schema loading)\n");
 105                 talloc_free(mem_ctx);
 106                 return ldb_next_init(module);
 107         } else if (schema_res->count > 1) {
 108                 ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
 109                               "schema_fsmo_init: [%u] schema heads found on a base search\n",
 110                               schema_res->count);
 111                 talloc_free(mem_ctx);
 112                 return LDB_ERR_CONSTRAINT_VIOLATION;
 113         }
 114
 115         prefix_val = ldb_msg_find_ldb_val(schema_res->msgs[0], "prefixMap");
 116         if (!prefix_val) {
 117                 ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
 118                               "schema_fsmo_init: no prefixMap attribute found\n");
 119                 talloc_free(mem_ctx);
 120                 return LDB_ERR_CONSTRAINT_VIOLATION;
 121         }
 122         info_val = ldb_msg_find_ldb_val(schema_res->msgs[0], "schemaInfo");
 123         if (!info_val) {
 124                 info_val_default = strhex_to_data_blob("FF0000000000000000000000000000000000000000");
 125                 if (!info_val_default.data) {
 126                         ldb_oom(module->ldb);
 127                         return LDB_ERR_OPERATIONS_ERROR;
 128                 }
 129                 talloc_steal(mem_ctx, info_val_default.data);
 130                 info_val = &info_val_default;
 131         }
 132
 133         status = dsdb_load_oid_mappings_ldb(schema, prefix_val, info_val);
 134         if (!W_ERROR_IS_OK(status)) {
 135                 ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
 136                               "schema_fsmo_init: failed to load oid mappings: %s\n",
 137                               win_errstr(status));
 138                 talloc_free(mem_ctx);
 139                 return LDB_ERR_CONSTRAINT_VIOLATION;
 140         }
 141
 142         /*
 143          * load the attribute definitions
 144          */
 145         ret = ldb_search(module->ldb, schema_dn,
 146                          LDB_SCOPE_ONELEVEL,
 147                          "(objectClass=attributeSchema)", NULL,
 148                          &a_res);
 149         if (ret != LDB_SUCCESS) {
 150                 ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
 151                               "schema_fsmo_init: failed to search attributeSchema objects: %d:%s\n",
 152                               ret, ldb_strerror(ret));
 153                 talloc_free(mem_ctx);
 154                 return ret;
 155         }
 156         talloc_steal(mem_ctx, a_res);
 157
 158         for (i=0; i < a_res->count; i++) {
 159                 struct dsdb_attribute *sa;
 160
 161                 sa = talloc_zero(schema, struct dsdb_attribute);
 162                 if (!sa) {
 163                         ldb_oom(module->ldb);
 164                         return LDB_ERR_OPERATIONS_ERROR;
 165                 }
 166
 167                 status = dsdb_attribute_from_ldb(schema, a_res->msgs[i], sa, sa);
 168                 if (!W_ERROR_IS_OK(status)) {
 169                         ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
 170                                       "schema_fsmo_init: failed to load attriute definition: %s:%s\n",
 171                                       ldb_dn_get_linearized(a_res->msgs[i]->dn),
 172                                       win_errstr(status));
 173                         talloc_free(mem_ctx);
 174                         return LDB_ERR_CONSTRAINT_VIOLATION;
 175                 }
 176
 177                 DLIST_ADD_END(schema->attributes, sa, struct dsdb_attribute *);
 178         }
 179         talloc_free(a_res);
 180
 181         /*
 182          * load the objectClass definitions
 183          */
 184         ret = ldb_search(module->ldb, schema_dn,
 185                          LDB_SCOPE_ONELEVEL,
 186                          "(objectClass=classSchema)", NULL,
 187                          &c_res);
 188         if (ret != LDB_SUCCESS) {
 189                 ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
 190                               "schema_fsmo_init: failed to search classSchema objects: %d:%s\n",
 191                               ret, ldb_strerror(ret));
 192                 talloc_free(mem_ctx);
 193                 return ret;
 194         }
 195         talloc_steal(mem_ctx, c_res);
 196
 197         for (i=0; i < c_res->count; i++) {
 198                 struct dsdb_class *sc;
 199
 200                 sc = talloc_zero(schema, struct dsdb_class);
 201                 if (!sc) {
 202                         ldb_oom(module->ldb);
 203                         return LDB_ERR_OPERATIONS_ERROR;
 204                 }
 205
 206                 status = dsdb_class_from_ldb(schema, c_res->msgs[i], sc, sc);
 207                 if (!W_ERROR_IS_OK(status)) {
 208                         ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
 209                                       "schema_fsmo_init: failed to load class definition: %s:%s\n",
 210                                       ldb_dn_get_linearized(c_res->msgs[i]->dn),
 211                                       win_errstr(status));
 212                         talloc_free(mem_ctx);
 213                         return LDB_ERR_CONSTRAINT_VIOLATION;
 214                 }
 215
 216                 DLIST_ADD_END(schema->classes, sc, struct dsdb_class *);
 217         }
 218         talloc_free(c_res);
 219
 220         /* dsdb_set_schema() steal schema into the ldb_context */
 221         ret = dsdb_set_schema(module->ldb, schema);
 222         if (ret != LDB_SUCCESS) {
 223                 ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
 224                               "schema_fsmo_init: dsdb_set_schema() failed: %d:%s\n",
 225                               ret, ldb_strerror(ret));
 226                 talloc_free(mem_ctx);
 227                 return ret;
 228         }
 229
 230         schema_fsmo->master_dn = ldb_msg_find_attr_as_dn(module->ldb, schema_fsmo, schema_res->msgs[0], "fSMORoleOwner");
 231         if (ldb_dn_compare(samdb_ntds_settings_dn(module->ldb), schema_fsmo->master_dn) == 0) {
 232                 schema_fsmo->we_are_master = true;
 233         } else {
 234                 schema_fsmo->we_are_master = false;
 235         }
 236
 237         if (ldb_set_opaque(module->ldb, "dsdb_schema_fsmo", schema_fsmo) != LDB_SUCCESS) {
 238                 ldb_oom(module->ldb);
 239                 return LDB_ERR_OPERATIONS_ERROR;
 240         }
 241
 242         talloc_steal(module, schema_fsmo);
 243
 244         ldb_debug(module->ldb, LDB_DEBUG_TRACE,
 245                           "schema_fsmo_init: we are master: %s\n",
 246                           (schema_fsmo->we_are_master?"yes":"no"));
 247
 248         talloc_free(mem_ctx);
 249         return ldb_next_init(module);
 250 }
 251
 252 static const struct ldb_module_ops schema_fsmo_ops = {
 253         .name           = "schema_fsmo",
 254         .init_context   = schema_fsmo_init
 255 };
 256
 257 int schema_fsmo_module_init(void)
 258 {
 259         return ldb_register_module(&schema_fsmo_ops);
 260 }