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/*
* Copyright (C) 2010 Martin Willi
* Copyright (C) 2010 revosec AG
*
* 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 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include "hook.h"
#include <encoding/payloads/unknown_payload.h>
typedef struct private_force_cookie_t private_force_cookie_t;
/**
* Private data of an force_cookie_t object.
*/
struct private_force_cookie_t {
/**
* Implements the hook_t interface.
*/
hook_t hook;
};
METHOD(listener_t, message, bool,
private_force_cookie_t *this, ike_sa_t *ike_sa, message_t *message,
bool incoming)
{
if (incoming && message->get_request(message) &&
message->get_exchange_type(message) == IKE_SA_INIT)
{
enumerator_t *enumerator;
bool has_cookie = FALSE;
payload_t *payload;
enumerator = message->create_payload_enumerator(message);
while (enumerator->enumerate(enumerator, &payload))
{
if (payload->get_type(payload) == NOTIFY)
{
notify_payload_t *notify = (notify_payload_t*)payload;
chunk_t data;
if (notify->get_notify_type(notify) == COOKIE)
{
data = notify->get_notification_data(notify);
DBG1(DBG_CFG, "received COOKIE: %#B", &data);
has_cookie = TRUE;
break;
}
}
}
enumerator->destroy(enumerator);
if (!has_cookie)
{
message_t *response;
host_t *src, *dst;
packet_t *packet;
ike_sa_id_t *ike_sa_id;
chunk_t data = chunk_from_thing("COOKIE test data");
DBG1(DBG_CFG, "sending COOKIE: %#B", &data);
response = message_create();
dst = message->get_source(message);
src = message->get_destination(message);
response->set_source(response, src->clone(src));
response->set_destination(response, dst->clone(dst));
response->set_exchange_type(response, IKE_SA_INIT);
response->set_request(response, FALSE);
response->set_message_id(response, 0);
ike_sa_id = message->get_ike_sa_id(message);
ike_sa_id->switch_initiator(ike_sa_id);
response->set_ike_sa_id(response, ike_sa_id);
response->add_notify(response, FALSE, COOKIE, data);
if (response->generate(response, NULL, &packet) == SUCCESS)
{
charon->sender->send(charon->sender, packet);
response->destroy(response);
}
message->set_exchange_type(message, EXCHANGE_TYPE_UNDEFINED);
}
}
return TRUE;
}
METHOD(hook_t, destroy, void,
private_force_cookie_t *this)
{
free(this);
}
/**
* Create the IKE_AUTH fill hook
*/
hook_t *force_cookie_hook_create(char *name)
{
private_force_cookie_t *this;
INIT(this,
.hook = {
.listener = {
.message = _message,
},
.destroy = _destroy,
},
);
return &this->hook;
}
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