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/*
Unix SMB/CIFS mplementation.
The module that handles the Schema FSMO Role Owner
checkings, it also loads the dsdb_schema.
Copyright (C) Stefan Metzmacher <metze@samba.org> 2007
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "lib/ldb/include/ldb.h"
#include "lib/ldb/include/ldb_errors.h"
#include "lib/ldb/include/ldb_private.h"
#include "dsdb/samdb/samdb.h"
#include "librpc/gen_ndr/ndr_misc.h"
#include "librpc/gen_ndr/ndr_drsuapi.h"
#include "librpc/gen_ndr/ndr_drsblobs.h"
#include "lib/util/dlinklist.h"
static int schema_fsmo_init(struct ldb_module *module)
{
WERROR status;
TALLOC_CTX *mem_ctx;
struct ldb_dn *schema_dn;
struct dsdb_schema *schema;
struct dsdb_schema_fsmo *schema_fsmo;
struct ldb_result *schema_res;
const struct ldb_val *prefix_val;
const struct ldb_val *info_val;
struct ldb_val info_val_default;
struct ldb_result *a_res;
struct ldb_result *c_res;
uint32_t i;
int ret;
static const char *schema_attrs[] = {
"prefixMap",
"schemaInfo",
"fSMORoleOwner",
NULL
};
if (dsdb_get_schema(module->ldb)) {
return ldb_next_init(module);
}
schema_dn = samdb_schema_dn(module->ldb);
if (!schema_dn) {
ldb_debug(module->ldb, LDB_DEBUG_WARNING,
"schema_fsmo_init: no schema dn present: (skip schema loading)");
return ldb_next_init(module);
}
mem_ctx = talloc_new(module);
if (!mem_ctx) {
ldb_oom(module->ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
schema_fsmo = talloc_zero(mem_ctx, struct dsdb_schema_fsmo);
if (!schema_fsmo) {
ldb_oom(module->ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
module->private_data = schema_fsmo;
schema = talloc_zero(mem_ctx, struct dsdb_schema);
if (!schema) {
ldb_oom(module->ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
/*
* setup the prefix mappings and schema info
*/
ret = ldb_search(module->ldb, schema_dn,
LDB_SCOPE_BASE,
NULL, schema_attrs,
&schema_res);
if (ret == LDB_ERR_NO_SUCH_OBJECT) {
ldb_debug(module->ldb, LDB_DEBUG_WARNING,
"schema_fsmo_init: no schema head present: (skip schema loading)");
talloc_free(mem_ctx);
return ldb_next_init(module);
} else if (ret != LDB_SUCCESS) {
ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
"schema_fsmo_init: failed to search the schema head: %d:%s",
ret, ldb_strerror(ret));
talloc_free(mem_ctx);
return ret;
}
talloc_steal(mem_ctx, schema_res);
if (schema_res->count == 0) {
ldb_debug(module->ldb, LDB_DEBUG_WARNING,
"schema_fsmo_init: no schema head present: (skip schema loading)");
talloc_free(mem_ctx);
return ldb_next_init(module);
} else if (schema_res->count > 1) {
ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
"schema_fsmo_init: [%u] schema heads found on a base search",
schema_res->count);
talloc_free(mem_ctx);
return LDB_ERR_CONSTRAINT_VIOLATION;
}
prefix_val = ldb_msg_find_ldb_val(schema_res->msgs[0], "prefixMap");
if (!prefix_val) {
ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
"schema_fsmo_init: no prefixMap attribute found");
talloc_free(mem_ctx);
return LDB_ERR_CONSTRAINT_VIOLATION;
}
info_val = ldb_msg_find_ldb_val(schema_res->msgs[0], "schemaInfo");
if (!info_val) {
info_val_default = strhex_to_data_blob("FF0000000000000000000000000000000000000000");
if (!info_val_default.data) {
ldb_oom(module->ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
talloc_steal(mem_ctx, info_val_default.data);
info_val = &info_val_default;
}
status = dsdb_load_oid_mappings_ldb(schema, prefix_val, info_val);
if (!W_ERROR_IS_OK(status)) {
ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
"schema_fsmo_init: failed to load oid mappings: %s",
win_errstr(status));
talloc_free(mem_ctx);
return LDB_ERR_CONSTRAINT_VIOLATION;
}
/*
* load the attribute definitions
*/
ret = ldb_search(module->ldb, schema_dn,
LDB_SCOPE_ONELEVEL,
"(objectClass=attributeSchema)", NULL,
&a_res);
if (ret != LDB_SUCCESS) {
ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
"schema_fsmo_init: failed to search attributeSchema objects: %d:%s",
ret, ldb_strerror(ret));
talloc_free(mem_ctx);
return ret;
}
talloc_steal(mem_ctx, a_res);
for (i=0; i < a_res->count; i++) {
struct dsdb_attribute *sa;
sa = talloc_zero(schema, struct dsdb_attribute);
if (!sa) {
ldb_oom(module->ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
status = dsdb_attribute_from_ldb(schema, a_res->msgs[i], sa, sa);
if (!W_ERROR_IS_OK(status)) {
ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
"schema_fsmo_init: failed to load attriute definition: %s:%s",
ldb_dn_get_linearized(a_res->msgs[i]->dn),
win_errstr(status));
talloc_free(mem_ctx);
return LDB_ERR_CONSTRAINT_VIOLATION;
}
DLIST_ADD_END(schema->attributes, sa, struct dsdb_attribute *);
}
talloc_free(a_res);
/*
* load the objectClass definitions
*/
ret = ldb_search(module->ldb, schema_dn,
LDB_SCOPE_ONELEVEL,
"(objectClass=classSchema)", NULL,
&c_res);
if (ret != LDB_SUCCESS) {
ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
"schema_fsmo_init: failed to search classSchema objects: %d:%s",
ret, ldb_strerror(ret));
talloc_free(mem_ctx);
return ret;
}
talloc_steal(mem_ctx, c_res);
for (i=0; i < c_res->count; i++) {
struct dsdb_class *sc;
sc = talloc_zero(schema, struct dsdb_class);
if (!sc) {
ldb_oom(module->ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
status = dsdb_class_from_ldb(schema, c_res->msgs[i], sc, sc);
if (!W_ERROR_IS_OK(status)) {
ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
"schema_fsmo_init: failed to load class definition: %s:%s",
ldb_dn_get_linearized(c_res->msgs[i]->dn),
win_errstr(status));
talloc_free(mem_ctx);
return LDB_ERR_CONSTRAINT_VIOLATION;
}
DLIST_ADD_END(schema->classes, sc, struct dsdb_class *);
}
talloc_free(c_res);
/* dsdb_set_schema() steal schema into the ldb_context */
ret = dsdb_set_schema(module->ldb, schema);
if (ret != LDB_SUCCESS) {
ldb_debug_set(module->ldb, LDB_DEBUG_FATAL,
"schema_fsmo_init: dsdb_set_schema() failed: %d:%s",
ret, ldb_strerror(ret));
talloc_free(mem_ctx);
return ret;
}
schema_fsmo->master_dn = ldb_msg_find_attr_as_dn(module->ldb, schema_fsmo, schema_res->msgs[0], "fSMORoleOwner");
if (ldb_dn_compare(samdb_ntds_settings_dn(module->ldb), schema_fsmo->master_dn) == 0) {
schema_fsmo->we_are_master = true;
} else {
schema_fsmo->we_are_master = false;
}
if (ldb_set_opaque(module->ldb, "dsdb_schema_fsmo", schema_fsmo) != LDB_SUCCESS) {
ldb_oom(module->ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
talloc_steal(module, schema_fsmo);
ldb_debug(module->ldb, LDB_DEBUG_TRACE,
"schema_fsmo_init: we are master: %s",
(schema_fsmo->we_are_master?"yes":"no"));
talloc_free(mem_ctx);
return ldb_next_init(module);
}
static const struct ldb_module_ops schema_fsmo_ops = {
.name = "schema_fsmo",
.init_context = schema_fsmo_init
};
int schema_fsmo_module_init(void)
{
return ldb_register_module(&schema_fsmo_ops);
}
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