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/**
* @file delete_ike_sa_requested.c
*
* @brief Implementation of delete_ike_sa_requested_t.
*
*/
/*
* Copyright (C) 2006 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* 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 "delete_ike_sa_requested.h"
#include <daemon.h>
typedef struct private_delete_ike_sa_requested_t private_delete_ike_sa_requested_t;
/**
* Private data of a delete_ike_sa_requested_t object.
*/
struct private_delete_ike_sa_requested_t {
/**
* methods of the state_t interface
*/
delete_ike_sa_requested_t public;
/**
* Assigned IKE_SA.
*/
protected_ike_sa_t *ike_sa;
/**
* Assigned logger. Use logger of IKE_SA.
*/
logger_t *logger;
};
/**
* Implements state_t.get_state
*/
static status_t process_message(private_delete_ike_sa_requested_t *this, message_t *message)
{
ike_sa_id_t *ike_sa_id;
crypter_t *crypter;
signer_t *signer;
status_t status;
/* Notation as follows:
* Mx{D} means: Message, with message ID "x", containing a Delete payload
*
* The clarifcation Document says in 5.8, that a IKE_SA delete should not
* be acknowledged with the same delete. This only makes sense for CHILD_SAs,
* as they are paired. IKE_SAs are not, there is only one for both ends.
*
* Normal case:
* ----------------
* Mx{D} -->
* <-- Mx{}
* Delete request is sent, and we wait for the acknowledge.
*
* Special case 1:
* ---------------
* Mx{D} -->
* <-- My{D}
* My{} -->
* <-- Mx{}
* Both initate a delete at the same time. We ack the delete, but wait for
* our delete to be acknowledged.
*/
if (message->get_exchange_type(message) != INFORMATIONAL)
{
/* anything other than information is ignored. We can an will not handle
* messages such as CREATE_CHILD_SA */
this->logger->log(this->logger, ERROR | LEVEL1,
"%s messages not supported in state delete_ike_sa_requested. Ignored",
mapping_find(exchange_type_m, message->get_exchange_type(message)));
return FAILED;
}
if (message->get_request(message))
{
/* if it is a request, not a reply to our delete request, we
* just acknowledge this. We stay in our state, as the other peer
* has to ACK our request.
*/
message_t *acknowledge;
this->ike_sa->build_message(this->ike_sa, INFORMATIONAL, FALSE, &acknowledge);
return this->ike_sa->send_response(this->ike_sa, acknowledge);
}
/* get signer for verification and crypter for decryption */
ike_sa_id = this->ike_sa->public.get_id(&(this->ike_sa->public));
if (!ike_sa_id->is_initiator(ike_sa_id))
{
crypter = this->ike_sa->get_crypter_initiator(this->ike_sa);
signer = this->ike_sa->get_signer_initiator(this->ike_sa);
}
else
{
crypter = this->ike_sa->get_crypter_responder(this->ike_sa);
signer = this->ike_sa->get_signer_responder(this->ike_sa);
}
/* parse incoming message, check if it's proper signed */
status = message->parse_body(message, crypter, signer);
if (status != SUCCESS)
{
this->logger->log(this->logger, AUDIT, "INFORMATIONAL message decryption failed. Ignoring message");
return status;
}
/* ok, he knows about the deletion, destroy this IKE SA */
return DESTROY_ME;
}
/**
* Implementation of state_t.get_state.
*/
static ike_sa_state_t get_state(private_delete_ike_sa_requested_t *this)
{
return DELETE_IKE_SA_REQUESTED;
}
/**
* Implementation of state_t.get_state
*/
static void destroy(private_delete_ike_sa_requested_t *this)
{
free(this);
}
/*
* Described in header.
*/
delete_ike_sa_requested_t *delete_ike_sa_requested_create(protected_ike_sa_t *ike_sa)
{
private_delete_ike_sa_requested_t *this = malloc_thing(private_delete_ike_sa_requested_t);
/* interface functions */
this->public.state_interface.process_message = (status_t (*) (state_t *,message_t *)) process_message;
this->public.state_interface.get_state = (ike_sa_state_t (*) (state_t *)) get_state;
this->public.state_interface.destroy = (void (*) (state_t *)) destroy;
/* private data */
this->ike_sa = ike_sa;
this->logger = logger_manager->get_logger(logger_manager, IKE_SA);
return &(this->public);
}
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