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 3 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, see <http://www.gnu.org/licenses/>.
  21
  22 */
  23
  24 #include "includes.h"
  25 #include "lib/ldb/include/ldb.h"
  26 #include "lib/ldb/include/ldb_errors.h"
  27 #include "lib/ldb/include/ldb_private.h"
  28 #include "dsdb/samdb/samdb.h"
  29 #include "librpc/gen_ndr/ndr_misc.h"
  30 #include "librpc/gen_ndr/ndr_drsuapi.h"
  31 #include "librpc/gen_ndr/ndr_drsblobs.h"
  32 #include "lib/util/dlinklist.h"
  33
  34 static int schema_fsmo_init(struct ldb_module *module)
  35 {
  36         WERROR status;
  37         TALLOC_CTX *mem_ctx;
  38         struct ldb_dn *schema_dn;
  39         struct dsdb_schema *schema;
  40         struct dsdb_schema_fsmo *schema_fsmo;
  41         struct ldb_result *schema_res;
  42         const struct ldb_val *prefix_val;
  43         const struct ldb_val *info_val;
  44         struct ldb_val info_val_default;
  45         struct ldb_result *a_res;
  46         struct ldb_result *c_res;
  47         uint32_t i;
  48         int ret;
  49         static const char *schema_attrs[] = {
  50                 "prefixMap",
  51                 "schemaInfo",
  52                 "fSMORoleOwner",
  53                 NULL
  54         };
  55
  56         if (dsdb_get_schema(module->ldb)) {
  57                 return ldb_next_init(module);
  58         }
  59
  60         schema_dn = samdb_schema_dn(module->ldb);
  61         if (!schema_dn) {
  62                 ldb_reset_err_string(module->ldb);
  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_ERR_NO_SUCH_OBJECT) {
  95                 ldb_reset_err_string(module->ldb);
  96                 ldb_debug(module->ldb, LDB_DEBUG_WARNING,
  97                           "schema_fsmo_init: no schema head present: (skip schema loading)\n");
  98                 talloc_free(mem_ctx);
  99                 return ldb_next_init(module);
 100         } else if (ret != LDB_SUCCESS) {
 101                 ldb_asprintf_errstring(module->ldb,
 102                                        "schema_fsmo_init: failed to search the schema head: %s",
 103                                        ldb_errstring(module->ldb));
 104                 talloc_free(mem_ctx);
 105                 return ret;
 106         }
 107         talloc_steal(mem_ctx, schema_res);
 108         if (schema_res->count == 0) {
 109                 ldb_debug(module->ldb, LDB_DEBUG_WARNING,
 110                           "schema_fsmo_init: no schema head present: (skip schema loading)\n");
 111                 talloc_free(mem_ctx);
 112                 return ldb_next_init(module);
 113         } else if (schema_res->count > 1) {
 114                 ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
 115                               "schema_fsmo_init: [%u] schema heads found on a base search",
 116                               schema_res->count);
 117                 talloc_free(mem_ctx);
 118                 return LDB_ERR_CONSTRAINT_VIOLATION;
 119         }
 120
 121         prefix_val = ldb_msg_find_ldb_val(schema_res->msgs[0], "prefixMap");
 122         if (!prefix_val) {
 123                 ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
 124                               "schema_fsmo_init: no prefixMap attribute found");
 125                 talloc_free(mem_ctx);
 126                 return LDB_ERR_CONSTRAINT_VIOLATION;
 127         }
 128         info_val = ldb_msg_find_ldb_val(schema_res->msgs[0], "schemaInfo");
 129         if (!info_val) {
 130                 info_val_default = strhex_to_data_blob("FF0000000000000000000000000000000000000000");
 131                 if (!info_val_default.data) {
 132                         ldb_oom(module->ldb);
 133                         return LDB_ERR_OPERATIONS_ERROR;
 134                 }
 135                 talloc_steal(mem_ctx, info_val_default.data);
 136                 info_val = &info_val_default;
 137         }
 138
 139         status = dsdb_load_oid_mappings_ldb(schema, prefix_val, info_val);
 140         if (!W_ERROR_IS_OK(status)) {
 141                 ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
 142                               "schema_fsmo_init: failed to load oid mappings: %s",
 143                               win_errstr(status));
 144                 talloc_free(mem_ctx);
 145                 return LDB_ERR_CONSTRAINT_VIOLATION;
 146         }
 147
 148         /*
 149          * load the attribute definitions
 150          */
 151         ret = ldb_search(module->ldb, schema_dn,
 152                          LDB_SCOPE_ONELEVEL,
 153                          "(objectClass=attributeSchema)", NULL,
 154                          &a_res);
 155         if (ret != LDB_SUCCESS) {
 156                 ldb_asprintf_errstring(module->ldb,
 157                                        "schema_fsmo_init: failed to search attributeSchema objects: %s",
 158                                        ldb_errstring(module->ldb));
 159                 talloc_free(mem_ctx);
 160                 return ret;
 161         }
 162         talloc_steal(mem_ctx, a_res);
 163
 164         for (i=0; i < a_res->count; i++) {
 165                 struct dsdb_attribute *sa;
 166
 167                 sa = talloc_zero(schema, struct dsdb_attribute);
 168                 if (!sa) {
 169                         ldb_oom(module->ldb);
 170                         return LDB_ERR_OPERATIONS_ERROR;
 171                 }
 172
 173                 status = dsdb_attribute_from_ldb(schema, a_res->msgs[i], sa, sa);
 174                 if (!W_ERROR_IS_OK(status)) {
 175                         ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
 176                                       "schema_fsmo_init: failed to load attriute definition: %s:%s",
 177                                       ldb_dn_get_linearized(a_res->msgs[i]->dn),
 178                                       win_errstr(status));
 179                         talloc_free(mem_ctx);
 180                         return LDB_ERR_CONSTRAINT_VIOLATION;
 181                 }
 182
 183                 DLIST_ADD_END(schema->attributes, sa, struct dsdb_attribute *);
 184         }
 185         talloc_free(a_res);
 186
 187         /*
 188          * load the objectClass definitions
 189          */
 190         ret = ldb_search(module->ldb, schema_dn,
 191                          LDB_SCOPE_ONELEVEL,
 192                          "(objectClass=classSchema)", NULL,
 193                          &c_res);
 194         if (ret != LDB_SUCCESS) {
 195                 ldb_asprintf_errstring(module->ldb,
 196                                        "schema_fsmo_init: failed to search classSchema objects: %s",
 197                                        ldb_errstring(module->ldb));
 198                 talloc_free(mem_ctx);
 199                 return ret;
 200         }
 201         talloc_steal(mem_ctx, c_res);
 202
 203         for (i=0; i < c_res->count; i++) {
 204                 struct dsdb_class *sc;
 205
 206                 sc = talloc_zero(schema, struct dsdb_class);
 207                 if (!sc) {
 208                         ldb_oom(module->ldb);
 209                         return LDB_ERR_OPERATIONS_ERROR;
 210                 }
 211
 212                 status = dsdb_class_from_ldb(schema, c_res->msgs[i], sc, sc);
 213                 if (!W_ERROR_IS_OK(status)) {
 214                         ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
 215                                       "schema_fsmo_init: failed to load class definition: %s:%s",
 216                                       ldb_dn_get_linearized(c_res->msgs[i]->dn),
 217                                       win_errstr(status));
 218                         talloc_free(mem_ctx);
 219                         return LDB_ERR_CONSTRAINT_VIOLATION;
 220                 }
 221
 222                 DLIST_ADD_END(schema->classes, sc, struct dsdb_class *);
 223         }
 224         talloc_free(c_res);
 225
 226         /* dsdb_set_schema() steal schema into the ldb_context */
 227         ret = dsdb_set_schema(module->ldb, schema);
 228         if (ret != LDB_SUCCESS) {
 229                 ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
 230                               "schema_fsmo_init: dsdb_set_schema() failed: %d:%s",
 231                               ret, ldb_strerror(ret));
 232                 talloc_free(mem_ctx);
 233                 return ret;
 234         }
 235
 236         schema_fsmo->master_dn = ldb_msg_find_attr_as_dn(module->ldb, schema_fsmo, schema_res->msgs[0], "fSMORoleOwner");
 237         if (ldb_dn_compare(samdb_ntds_settings_dn(module->ldb), schema_fsmo->master_dn) == 0) {
 238                 schema_fsmo->we_are_master = true;
 239         } else {
 240                 schema_fsmo->we_are_master = false;
 241         }
 242
 243         if (ldb_set_opaque(module->ldb, "dsdb_schema_fsmo", schema_fsmo) != LDB_SUCCESS) {
 244                 ldb_oom(module->ldb);
 245                 return LDB_ERR_OPERATIONS_ERROR;
 246         }
 247
 248         talloc_steal(module, schema_fsmo);
 249
 250         ldb_debug(module->ldb, LDB_DEBUG_TRACE,
 251                           "schema_fsmo_init: we are master: %s\n",
 252                           (schema_fsmo->we_are_master?"yes":"no"));
 253
 254         talloc_free(mem_ctx);
 255         return ldb_next_init(module);
 256 }
 257
 258 static const struct ldb_module_ops schema_fsmo_ops = {
 259         .name           = "schema_fsmo",
 260         .init_context   = schema_fsmo_init
 261 };
 262
 263 int schema_fsmo_module_init(void)
 264 {
 265         return ldb_register_module(&schema_fsmo_ops);
 266 }