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/*
* Copyright (C) 2016 Tobias Brunner
* Copyright (C) 2006-2007 Martin Willi
* HSR 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 "ike_delete.h"
#include <daemon.h>
#include <encoding/payloads/delete_payload.h>
#include <sa/ikev2/tasks/ike_rekey.h>
typedef struct private_ike_delete_t private_ike_delete_t;
/**
* Private members of a ike_delete_t task.
*/
struct private_ike_delete_t {
/**
* Public methods and task_t interface.
*/
ike_delete_t public;
/**
* Assigned IKE_SA.
*/
ike_sa_t *ike_sa;
/**
* Are we the initiator?
*/
bool initiator;
/**
* are we deleting a rekeyed SA?
*/
bool rekeyed;
};
METHOD(task_t, build_i, status_t,
private_ike_delete_t *this, message_t *message)
{
delete_payload_t *delete_payload;
DBG0(DBG_IKE, "deleting IKE_SA %s[%d] between %H[%Y]...%H[%Y]",
this->ike_sa->get_name(this->ike_sa),
this->ike_sa->get_unique_id(this->ike_sa),
this->ike_sa->get_my_host(this->ike_sa),
this->ike_sa->get_my_id(this->ike_sa),
this->ike_sa->get_other_host(this->ike_sa),
this->ike_sa->get_other_id(this->ike_sa));
delete_payload = delete_payload_create(PLV2_DELETE, PROTO_IKE);
message->add_payload(message, (payload_t*)delete_payload);
if (this->ike_sa->get_state(this->ike_sa) == IKE_REKEYING ||
this->ike_sa->get_state(this->ike_sa) == IKE_REKEYED)
{
this->rekeyed = TRUE;
}
this->ike_sa->set_state(this->ike_sa, IKE_DELETING);
DBG1(DBG_IKE, "sending DELETE for IKE_SA %s[%d]",
this->ike_sa->get_name(this->ike_sa),
this->ike_sa->get_unique_id(this->ike_sa));
return NEED_MORE;
}
METHOD(task_t, process_i, status_t,
private_ike_delete_t *this, message_t *message)
{
DBG0(DBG_IKE, "IKE_SA deleted");
if (!this->rekeyed)
{ /* invoke ike_down() hook if SA has not been rekeyed */
charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
}
/* completed, delete IKE_SA by returning DESTROY_ME */
return DESTROY_ME;
}
/**
* Check if this delete happened after a rekey collsion
*/
static bool after_rekey_collision(private_ike_delete_t *this)
{
enumerator_t *tasks;
task_t *task;
tasks = this->ike_sa->create_task_enumerator(this->ike_sa,
TASK_QUEUE_ACTIVE);
while (tasks->enumerate(tasks, &task))
{
if (task->get_type(task) == TASK_IKE_REKEY)
{
ike_rekey_t *rekey = (ike_rekey_t*)task;
if (rekey->did_collide(rekey))
{
tasks->destroy(tasks);
return TRUE;
}
}
}
tasks->destroy(tasks);
return FALSE;
}
METHOD(task_t, process_r, status_t,
private_ike_delete_t *this, message_t *message)
{
/* we don't even scan the payloads, as the message wouldn't have
* come so far without being correct */
DBG1(DBG_IKE, "received DELETE for IKE_SA %s[%d]",
this->ike_sa->get_name(this->ike_sa),
this->ike_sa->get_unique_id(this->ike_sa));
DBG0(DBG_IKE, "deleting IKE_SA %s[%d] between %H[%Y]...%H[%Y]",
this->ike_sa->get_name(this->ike_sa),
this->ike_sa->get_unique_id(this->ike_sa),
this->ike_sa->get_my_host(this->ike_sa),
this->ike_sa->get_my_id(this->ike_sa),
this->ike_sa->get_other_host(this->ike_sa),
this->ike_sa->get_other_id(this->ike_sa));
if (message->get_exchange_type(message) == INFORMATIONAL &&
message->get_notify(message, AUTHENTICATION_FAILED))
{
/* a late AUTHENTICATION_FAILED notify from the initiator after
* we have established the IKE_SA: signal auth failure */
charon->bus->alert(charon->bus, ALERT_LOCAL_AUTH_FAILED);
}
switch (this->ike_sa->get_state(this->ike_sa))
{
case IKE_REKEYING:
/* if the peer concurrently deleted the IKE_SA we treat this as
* regular delete. however, in case the peer did not detect a rekey
* collision it will delete the replaced IKE_SA if we are still in
* state IKE_REKEYING */
if (after_rekey_collision(this))
{
this->rekeyed = TRUE;
break;
}
/* fall-through */
case IKE_ESTABLISHED:
this->ike_sa->set_state(this->ike_sa, IKE_DELETING);
this->ike_sa->reestablish(this->ike_sa);
return NEED_MORE;
case IKE_REKEYED:
this->rekeyed = TRUE;
break;
default:
break;
}
this->ike_sa->set_state(this->ike_sa, IKE_DELETING);
return NEED_MORE;
}
METHOD(task_t, build_r, status_t,
private_ike_delete_t *this, message_t *message)
{
DBG0(DBG_IKE, "IKE_SA deleted");
if (!this->rekeyed)
{ /* invoke ike_down() hook if SA has not been rekeyed */
charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
}
/* completed, delete IKE_SA by returning DESTROY_ME */
return DESTROY_ME;
}
METHOD(task_t, get_type, task_type_t,
private_ike_delete_t *this)
{
return TASK_IKE_DELETE;
}
METHOD(task_t, migrate, void,
private_ike_delete_t *this, ike_sa_t *ike_sa)
{
this->ike_sa = ike_sa;
}
METHOD(task_t, destroy, void,
private_ike_delete_t *this)
{
free(this);
}
/*
* Described in header.
*/
ike_delete_t *ike_delete_create(ike_sa_t *ike_sa, bool initiator)
{
private_ike_delete_t *this;
INIT(this,
.public = {
.task = {
.get_type = _get_type,
.migrate = _migrate,
.destroy = _destroy,
},
},
.ike_sa = ike_sa,
.initiator = initiator,
);
if (initiator)
{
this->public.task.build = _build_i;
this->public.task.process = _process_i;
}
else
{
this->public.task.build = _build_r;
this->public.task.process = _process_r;
}
return &this->public;
}
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