source4/dsdb/samdb/ldb_modules/schema_load.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    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2009
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 */
  24
  25 #include "includes.h"
  26 #include "ldb_module.h"
  27 #include "dsdb/samdb/samdb.h"
  28 #include "librpc/gen_ndr/ndr_misc.h"
  29 #include "librpc/gen_ndr/ndr_drsuapi.h"
  30 #include "librpc/gen_ndr/ndr_drsblobs.h"
  31 #include "param/param.h"
  32 #include "dsdb/samdb/ldb_modules/util.h"
  33
  34 /*
  35   Given an LDB module (pointing at the schema DB), and the DN, set the populated schema
  36 */
  37
  38 static int dsdb_schema_from_schema_dn(TALLOC_CTX *mem_ctx, struct ldb_module *module,
  39                                       struct smb_iconv_convenience *iconv_convenience,
  40                                       struct ldb_dn *schema_dn,
  41                                       struct dsdb_schema **schema)
  42 {
  43         TALLOC_CTX *tmp_ctx;
  44         char *error_string;
  45         int ret;
  46         struct ldb_context *ldb = ldb_module_get_ctx(module);
  47         struct ldb_result *schema_res;
  48         struct ldb_result *a_res;
  49         struct ldb_result *c_res;
  50         static const char *schema_attrs[] = {
  51                 "prefixMap",
  52                 "schemaInfo",
  53                 "fSMORoleOwner",
  54                 NULL
  55         };
  56         unsigned flags;
  57
  58         tmp_ctx = talloc_new(mem_ctx);
  59         if (!tmp_ctx) {
  60                 ldb_oom(ldb);
  61                 return LDB_ERR_OPERATIONS_ERROR;
  62         }
  63
  64         /* we don't want to trace the schema load */
  65         flags = ldb_get_flags(ldb);
  66         ldb_set_flags(ldb, flags & ~LDB_FLG_ENABLE_TRACING);
  67
  68         /*
  69          * setup the prefix mappings and schema info
  70          */
  71         ret = dsdb_module_search_dn(module, tmp_ctx, &schema_res,
  72                                     schema_dn, schema_attrs);
  73         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
  74                 goto failed;
  75         } else if (ret != LDB_SUCCESS) {
  76                 ldb_asprintf_errstring(ldb,
  77                                        "dsdb_schema: failed to search the schema head: %s",
  78                                        ldb_errstring(ldb));
  79                 goto failed;
  80         }
  81
  82         /*
  83          * load the attribute definitions
  84          */
  85         ret = dsdb_module_search(module, tmp_ctx, &a_res,
  86                                  schema_dn, LDB_SCOPE_ONELEVEL, NULL,
  87                                  "(objectClass=attributeSchema)");
  88         if (ret != LDB_SUCCESS) {
  89                 ldb_asprintf_errstring(ldb,
  90                                        "dsdb_schema: failed to search attributeSchema objects: %s",
  91                                        ldb_errstring(ldb));
  92                 goto failed;
  93         }
  94
  95         /*
  96          * load the objectClass definitions
  97          */
  98         ret = dsdb_module_search(module, tmp_ctx, &c_res,
  99                                  schema_dn, LDB_SCOPE_ONELEVEL, NULL,
 100                                  "(objectClass=classSchema)");
 101         if (ret != LDB_SUCCESS) {
 102                 ldb_asprintf_errstring(ldb,
 103                                        "dsdb_schema: failed to search attributeSchema objects: %s",
 104                                        ldb_errstring(ldb));
 105                 goto failed;
 106         }
 107
 108         ret = dsdb_schema_from_ldb_results(tmp_ctx, ldb,
 109                                            lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
 110                                            schema_res, a_res, c_res, schema, &error_string);
 111         if (ret != LDB_SUCCESS) {
 112                 ldb_asprintf_errstring(ldb,
 113                                                     "dsdb_schema load failed: %s",
 114                                                     error_string);
 115                 goto failed;
 116         }
 117         talloc_steal(mem_ctx, *schema);
 118
 119 failed:
 120         if (flags & LDB_FLG_ENABLE_TRACING) {
 121                 flags = ldb_get_flags(ldb);
 122                 ldb_set_flags(ldb, flags | LDB_FLG_ENABLE_TRACING);
 123         }
 124         talloc_free(tmp_ctx);
 125         return ret;
 126 }
 127
 128
 129 static int schema_load_init(struct ldb_module *module)
 130 {
 131         struct ldb_context *ldb;
 132         TALLOC_CTX *mem_ctx;
 133         struct ldb_dn *schema_dn;
 134         struct dsdb_schema *schema;
 135         int ret;
 136
 137         ret = ldb_next_init(module);
 138         if (ret != LDB_SUCCESS) {
 139                 return ret;
 140         }
 141
 142         ldb = ldb_module_get_ctx(module);
 143         schema_dn = samdb_schema_dn(ldb);
 144         if (!schema_dn) {
 145                 ldb_reset_err_string(ldb);
 146                 ldb_debug(ldb, LDB_DEBUG_WARNING,
 147                           "schema_load_init: no schema dn present: (skip schema loading)\n");
 148                 return LDB_SUCCESS;
 149         }
 150
 151         if (dsdb_get_schema(ldb)) {
 152                 return LDB_SUCCESS;
 153         }
 154
 155         mem_ctx = talloc_new(module);
 156         if (!mem_ctx) {
 157                 ldb_oom(ldb);
 158                 return LDB_ERR_OPERATIONS_ERROR;
 159         }
 160
 161         ret = dsdb_schema_from_schema_dn(mem_ctx, module,
 162                                          lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
 163                                          schema_dn, &schema);
 164
 165         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 166                 ldb_reset_err_string(ldb);
 167                 ldb_debug(ldb, LDB_DEBUG_WARNING,
 168                           "schema_load_init: no schema head present: (skip schema loading)\n");
 169                 talloc_free(mem_ctx);
 170                 return LDB_SUCCESS;
 171         }
 172
 173         if (ret != LDB_SUCCESS) {
 174                 talloc_free(mem_ctx);
 175                 return ret;
 176         }
 177
 178         /* dsdb_set_schema() steal schema into the ldb_context */
 179         ret = dsdb_set_schema(ldb, schema);
 180         if (ret != LDB_SUCCESS) {
 181                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 182                               "schema_load_init: dsdb_set_schema() failed: %d:%s",
 183                               ret, ldb_strerror(ret));
 184                 talloc_free(mem_ctx);
 185                 return ret;
 186         }
 187
 188         talloc_free(mem_ctx);
 189         return LDB_SUCCESS;
 190 }
 191
 192 static int schema_load_extended(struct ldb_module *module, struct ldb_request *req)
 193 {
 194         struct ldb_context *ldb;
 195         struct ldb_dn *schema_dn;
 196         struct dsdb_schema *schema;
 197         int ret;
 198         TALLOC_CTX *mem_ctx;
 199
 200         ldb = ldb_module_get_ctx(module);
 201
 202         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_SCHEMA_UPDATE_NOW_OID) != 0) {
 203                 return ldb_next_request(module, req);
 204         }
 205
 206         schema_dn = samdb_schema_dn(ldb);
 207         if (!schema_dn) {
 208                 ldb_reset_err_string(ldb);
 209                 ldb_debug(ldb, LDB_DEBUG_WARNING,
 210                           "schema_load_extended: no schema dn present: (skip schema loading)\n");
 211                 return ldb_next_request(module, req);
 212         }
 213
 214         mem_ctx = talloc_new(module);
 215         if (!mem_ctx) {
 216                 ldb_oom(ldb);
 217                 return LDB_ERR_OPERATIONS_ERROR;
 218         }
 219
 220         ret = dsdb_schema_from_schema_dn(mem_ctx, module,
 221                                          lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
 222                                          schema_dn, &schema);
 223
 224         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 225                 ldb_reset_err_string(ldb);
 226                 ldb_debug(ldb, LDB_DEBUG_WARNING,
 227                           "schema_load_extended: no schema head present: (skip schema loading)\n");
 228                 talloc_free(mem_ctx);
 229                 return ldb_next_request(module, req);
 230         }
 231
 232         if (ret != LDB_SUCCESS) {
 233                 talloc_free(mem_ctx);
 234                 return ldb_next_request(module, req);
 235         }
 236
 237         /* Replace the old schema*/
 238         ret = dsdb_set_schema(ldb, schema);
 239         if (ret != LDB_SUCCESS) {
 240                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 241                               "schema_load_extended: dsdb_set_schema() failed: %d:%s",
 242                               ret, ldb_strerror(ret));
 243                 talloc_free(mem_ctx);
 244                 return ret;
 245         }
 246
 247         dsdb_make_schema_global(ldb);
 248
 249         talloc_free(mem_ctx);
 250         return LDB_SUCCESS;
 251 }
 252
 253
 254 _PUBLIC_ const struct ldb_module_ops ldb_schema_load_module_ops = {
 255         .name           = "schema_load",
 256         .init_context   = schema_load_init,
 257         .extended       = schema_load_extended,
 258 };