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/*
ldb database library
Copyright (C) Andrew Bartlett <abartlet@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/>.
*/
/*
* Name: ldb
*
* Component: ldb update_keytabs module
*
* Description: Update keytabs whenever their matching secret record changes
*
* Author: Andrew Bartlett
*/
#include "includes.h"
#include "ldb/include/ldb_includes.h"
#include "auth/credentials/credentials.h"
#include "auth/credentials/credentials_krb5.h"
#include "system/kerberos.h"
#include "param/param.h"
struct dn_list {
struct cli_credentials *creds;
struct dn_list *prev, *next;
};
struct update_kt_private {
struct dn_list *changed_dns;
};
static int add_modified(struct ldb_module *module, struct ldb_dn *dn, bool delete) {
struct update_kt_private *data = talloc_get_type(module->private_data, struct update_kt_private);
struct dn_list *item;
char *filter;
struct ldb_result *res;
const char *attrs[] = { NULL };
int ret;
NTSTATUS status;
filter = talloc_asprintf(data, "(&(dn=%s)(&(objectClass=kerberosSecret)(privateKeytab=*)))",
ldb_dn_get_linearized(dn));
if (!filter) {
ldb_oom(module->ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
ret = ldb_search(module->ldb, dn, LDB_SCOPE_BASE,
filter, attrs, &res);
if (ret != LDB_SUCCESS) {
talloc_free(filter);
return ret;
}
if (res->count != 1) {
/* if it's not a kerberosSecret then we don't have anything to update */
talloc_free(res);
talloc_free(filter);
return LDB_SUCCESS;
}
talloc_free(res);
item = talloc(data->changed_dns? (void *)data->changed_dns: (void *)data, struct dn_list);
if (!item) {
talloc_free(filter);
ldb_oom(module->ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
item->creds = cli_credentials_init(item);
if (!item->creds) {
DEBUG(1, ("cli_credentials_init failed!"));
talloc_free(filter);
ldb_oom(module->ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
cli_credentials_set_conf(item->creds, ldb_get_opaque(module->ldb, "loadparm"));
status = cli_credentials_set_secrets(item->creds, ldb_get_opaque(module->ldb, "loadparm"), module->ldb, NULL, filter);
talloc_free(filter);
if (NT_STATUS_IS_OK(status)) {
if (delete) {
/* Ensure we don't helpfully keep an old keytab entry */
cli_credentials_set_kvno(item->creds, cli_credentials_get_kvno(item->creds)+2);
/* Wipe passwords */
cli_credentials_set_nt_hash(item->creds, NULL,
CRED_SPECIFIED);
}
DLIST_ADD_END(data->changed_dns, item, struct dn_list *);
}
return LDB_SUCCESS;
}
/* add */
static int update_kt_add(struct ldb_module *module, struct ldb_request *req)
{
int ret;
ret = ldb_next_request(module, req);
if (ret != LDB_SUCCESS) {
return ret;
}
return add_modified(module, req->op.add.message->dn, false);
}
/* modify */
static int update_kt_modify(struct ldb_module *module, struct ldb_request *req)
{
int ret;
ret = ldb_next_request(module, req);
if (ret != LDB_SUCCESS) {
return ret;
}
return add_modified(module, req->op.mod.message->dn, false);
}
/* delete */
static int update_kt_delete(struct ldb_module *module, struct ldb_request *req)
{
int ret;
/* Before we delete it, record the details */
ret = add_modified(module, req->op.del.dn, true);
if (ret != LDB_SUCCESS) {
return ret;
}
return ldb_next_request(module, req);
}
/* rename */
static int update_kt_rename(struct ldb_module *module, struct ldb_request *req)
{
int ret;
ret = ldb_next_request(module, req);
if (ret != LDB_SUCCESS) {
return ret;
}
return add_modified(module, req->op.rename.newdn, false);
}
/* end a transaction */
static int update_kt_end_trans(struct ldb_module *module)
{
struct update_kt_private *data = talloc_get_type(module->private_data, struct update_kt_private);
struct dn_list *p;
for (p=data->changed_dns; p; p = p->next) {
int kret;
kret = cli_credentials_update_keytab(p->creds, ldb_get_opaque(module->ldb, "loadparm"));
if (kret != 0) {
talloc_free(data->changed_dns);
data->changed_dns = NULL;
ldb_asprintf_errstring(module->ldb, "Failed to update keytab: %s", error_message(kret));
return LDB_ERR_OPERATIONS_ERROR;
}
}
talloc_free(data->changed_dns);
data->changed_dns = NULL;
return ldb_next_end_trans(module);
}
/* end a transaction */
static int update_kt_del_trans(struct ldb_module *module)
{
struct update_kt_private *data = talloc_get_type(module->private_data, struct update_kt_private);
talloc_free(data->changed_dns);
data->changed_dns = NULL;
return ldb_next_del_trans(module);
}
static int update_kt_init(struct ldb_module *module)
{
struct update_kt_private *data;
data = talloc(module, struct update_kt_private);
if (data == NULL) {
ldb_oom(module->ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
module->private_data = data;
data->changed_dns = NULL;
return ldb_next_init(module);
}
static const struct ldb_module_ops update_kt_ops = {
.name = "update_keytab",
.init_context = update_kt_init,
.add = update_kt_add,
.modify = update_kt_modify,
.rename = update_kt_rename,
.del = update_kt_delete,
.end_transaction = update_kt_end_trans,
.del_transaction = update_kt_del_trans,
};
int ldb_update_kt_init(void)
{
return ldb_register_module(&update_kt_ops);
}
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