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/*
ldb database library
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2007
Copyright (C) Simo Sorce <idra@samba.org> 2008
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/>.
*/
/*
* Name: ldb
*
* Component: ldb linked_attributes module
*
* Description: Module to ensure linked attribute pairs remain in sync
*
* Author: Andrew Bartlett
*/
#include "includes.h"
#include "ldb_module.h"
#include "dlinklist.h"
#include "dsdb/samdb/samdb.h"
#include "librpc/gen_ndr/ndr_misc.h"
#include "dsdb/samdb/ldb_modules/util.h"
static int linked_attributes_fix_links(struct ldb_module *module,
struct ldb_dn *old_dn, struct ldb_dn *new_dn,
struct ldb_message_element *el, struct dsdb_schema *schema,
const struct dsdb_attribute *schema_attr)
{
int i;
TALLOC_CTX *tmp_ctx = talloc_new(module);
struct ldb_context *ldb = ldb_module_get_ctx(module);
const struct dsdb_attribute *target;
const char *attrs[2];
target = dsdb_attribute_by_linkID(schema, schema_attr->linkID ^ 1);
if (target == NULL) {
/* there is no counterpart link to change */
return LDB_SUCCESS;
}
attrs[0] = target->lDAPDisplayName;
attrs[1] = NULL;
for (i=0; i<el->num_values; i++) {
struct dsdb_dn *dsdb_dn;
int ret, j;
struct ldb_result *res;
struct ldb_message *msg;
struct ldb_message_element *el2;
dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &el->values[i], schema_attr->syntax->ldap_oid);
if (dsdb_dn == NULL) {
talloc_free(tmp_ctx);
return LDB_ERR_INVALID_DN_SYNTAX;
}
ret = dsdb_module_search_dn(module, tmp_ctx, &res, dsdb_dn->dn,
attrs,
DSDB_SEARCH_SHOW_DELETED |
DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
DSDB_SEARCH_REVEAL_INTERNALS);
if (ret != LDB_SUCCESS) {
ldb_asprintf_errstring(ldb, "Linked attribute %s->%s between %s and %s - remote not found - %s",
el->name, target->lDAPDisplayName,
ldb_dn_get_linearized(old_dn),
ldb_dn_get_linearized(dsdb_dn->dn),
ldb_errstring(ldb));
talloc_free(tmp_ctx);
return ret;
}
msg = res->msgs[0];
if (msg->num_elements != 1 ||
ldb_attr_cmp(msg->elements[0].name, target->lDAPDisplayName) != 0) {
ldb_set_errstring(ldb, "Bad msg elements in linked_attributes_fix_links");
talloc_free(tmp_ctx);
return LDB_ERR_OPERATIONS_ERROR;
}
el2 = &msg->elements[0];
el2->flags = LDB_FLAG_MOD_REPLACE;
/* find our DN in the values */
for (j=0; j<el2->num_values; j++) {
struct dsdb_dn *dsdb_dn2;
dsdb_dn2 = dsdb_dn_parse(msg, ldb, &el2->values[j], target->syntax->ldap_oid);
if (dsdb_dn2 == NULL) {
talloc_free(tmp_ctx);
return LDB_ERR_INVALID_DN_SYNTAX;
}
if (ldb_dn_compare(old_dn, dsdb_dn2->dn) != 0) {
continue;
}
ret = ldb_dn_update_components(dsdb_dn2->dn, new_dn);
if (ret != LDB_SUCCESS) {
talloc_free(tmp_ctx);
return ret;
}
el2->values[j] = data_blob_string_const(
dsdb_dn_get_extended_linearized(el2->values, dsdb_dn2, 1));
}
ret = dsdb_check_single_valued_link(target, el2);
if (ret != LDB_SUCCESS) {
talloc_free(tmp_ctx);
return ret;
}
ret = dsdb_module_modify(module, msg, DSDB_MODIFY_RELAX);
if (ret != LDB_SUCCESS) {
ldb_asprintf_errstring(ldb, "Linked attribute %s->%s between %s and %s - update failed - %s",
el->name, target->lDAPDisplayName,
ldb_dn_get_linearized(old_dn),
ldb_dn_get_linearized(dsdb_dn->dn),
ldb_errstring(ldb));
talloc_free(tmp_ctx);
return ret;
}
}
talloc_free(tmp_ctx);
return LDB_SUCCESS;
}
/* rename */
static int linked_attributes_rename(struct ldb_module *module, struct ldb_request *req)
{
struct ldb_result *res;
struct ldb_message *msg;
int ret, i;
struct ldb_context *ldb = ldb_module_get_ctx(module);
struct dsdb_schema *schema = dsdb_get_schema(ldb);
/*
- load the current msg
- find any linked attributes
- if its a link then find the target object
- modify the target linked attributes with the new DN
*/
ret = dsdb_module_search_dn(module, req, &res, req->op.rename.olddn,
NULL, DSDB_SEARCH_SHOW_DELETED);
if (ret != LDB_SUCCESS) {
return ret;
}
msg = res->msgs[0];
for (i=0; i<msg->num_elements; i++) {
struct ldb_message_element *el = &msg->elements[i];
const struct dsdb_attribute *schema_attr
= dsdb_attribute_by_lDAPDisplayName(schema, el->name);
if (!schema_attr || schema_attr->linkID == 0) {
continue;
}
ret = linked_attributes_fix_links(module, msg->dn, req->op.rename.newdn, el,
schema, schema_attr);
if (ret != LDB_SUCCESS) {
talloc_free(res);
return ret;
}
}
talloc_free(res);
return ldb_next_request(module, req);
}
_PUBLIC_ const struct ldb_module_ops ldb_linked_attributes_module_ops = {
.name = "linked_attributes",
.rename = linked_attributes_rename,
};
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