412 lines
12 KiB
C
412 lines
12 KiB
C
/*
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* Copyright (C) 2005-2008 Martin Willi
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* Copyright (C) 2005 Jan Hutter
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* $Id$
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*/
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#include "ike_rekey.h"
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#include <daemon.h>
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#include <encoding/payloads/notify_payload.h>
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#include <sa/tasks/ike_init.h>
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#include <sa/tasks/ike_delete.h>
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#include <processing/jobs/delete_ike_sa_job.h>
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#include <processing/jobs/rekey_ike_sa_job.h>
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typedef struct private_ike_rekey_t private_ike_rekey_t;
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/**
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* Private members of a ike_rekey_t task.
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*/
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struct private_ike_rekey_t {
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/**
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* Public methods and task_t interface.
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*/
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ike_rekey_t public;
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/**
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* Assigned IKE_SA.
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*/
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ike_sa_t *ike_sa;
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/**
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* New IKE_SA which replaces the current one
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*/
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ike_sa_t *new_sa;
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/**
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* Are we the initiator?
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*/
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bool initiator;
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/**
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* the IKE_INIT task which is reused to simplify rekeying
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*/
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ike_init_t *ike_init;
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/**
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* IKE_DELETE task to delete the old IKE_SA after rekeying was successful
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*/
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ike_delete_t *ike_delete;
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/**
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* colliding task detected by the task manager
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*/
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task_t *collision;
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};
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/**
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* Implementation of task_t.build for initiator, after rekeying
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*/
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static status_t build_i_delete(private_ike_rekey_t *this, message_t *message)
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{
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/* update exchange type to INFORMATIONAL for the delete */
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message->set_exchange_type(message, INFORMATIONAL);
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return this->ike_delete->task.build(&this->ike_delete->task, message);
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}
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/**
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* Implementation of task_t.process for initiator, after rekeying
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*/
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static status_t process_i_delete(private_ike_rekey_t *this, message_t *message)
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{
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return this->ike_delete->task.process(&this->ike_delete->task, message);
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}
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/**
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* Implementation of task_t.build for initiator
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*/
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static status_t build_i(private_ike_rekey_t *this, message_t *message)
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{
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peer_cfg_t *peer_cfg;
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host_t *other_host;
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/* create new SA only on first try */
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if (this->new_sa == NULL)
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{
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this->new_sa = charon->ike_sa_manager->checkout_new(charon->ike_sa_manager,
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TRUE);
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peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
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other_host = this->ike_sa->get_other_host(this->ike_sa);
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this->new_sa->set_peer_cfg(this->new_sa, peer_cfg);
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this->new_sa->set_other_host(this->new_sa, other_host->clone(other_host));
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this->ike_init = ike_init_create(this->new_sa, TRUE, this->ike_sa);
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this->ike_sa->set_state(this->ike_sa, IKE_REKEYING);
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}
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this->ike_init->task.build(&this->ike_init->task, message);
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return NEED_MORE;
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}
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/**
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* Implementation of task_t.process for responder
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*/
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static status_t process_r(private_ike_rekey_t *this, message_t *message)
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{
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peer_cfg_t *peer_cfg;
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iterator_t *iterator;
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child_sa_t *child_sa;
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if (this->ike_sa->get_state(this->ike_sa) == IKE_DELETING)
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{
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DBG1(DBG_IKE, "peer initiated rekeying, but we are deleting");
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return NEED_MORE;
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}
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iterator = this->ike_sa->create_child_sa_iterator(this->ike_sa);
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while (iterator->iterate(iterator, (void**)&child_sa))
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{
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switch (child_sa->get_state(child_sa))
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{
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case CHILD_CREATED:
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case CHILD_REKEYING:
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case CHILD_DELETING:
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/* we do not allow rekeying while we have children in-progress */
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DBG1(DBG_IKE, "peer initiated rekeying, but a child is half-open");
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iterator->destroy(iterator);
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return NEED_MORE;
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default:
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break;
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}
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}
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iterator->destroy(iterator);
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this->new_sa = charon->ike_sa_manager->checkout_new(charon->ike_sa_manager,
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FALSE);
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peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
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this->new_sa->set_peer_cfg(this->new_sa, peer_cfg);
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this->ike_init = ike_init_create(this->new_sa, FALSE, this->ike_sa);
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this->ike_init->task.process(&this->ike_init->task, message);
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return NEED_MORE;
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}
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/**
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* Implementation of task_t.build for responder
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*/
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static status_t build_r(private_ike_rekey_t *this, message_t *message)
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{
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if (this->new_sa == NULL)
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{
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/* IKE_SA/a CHILD_SA is in an inacceptable state, deny rekeying */
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message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
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return SUCCESS;
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}
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if (this->ike_init->task.build(&this->ike_init->task, message) == FAILED)
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{
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return SUCCESS;
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}
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this->ike_sa->set_state(this->ike_sa, IKE_REKEYING);
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this->new_sa->set_state(this->new_sa, IKE_ESTABLISHED);
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DBG0(DBG_IKE, "IKE_SA %s[%d] established between %H[%D]...%H[%D]",
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this->new_sa->get_name(this->new_sa),
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this->new_sa->get_unique_id(this->new_sa),
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this->ike_sa->get_my_host(this->ike_sa),
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this->ike_sa->get_my_id(this->ike_sa),
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this->ike_sa->get_other_host(this->ike_sa),
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this->ike_sa->get_other_id(this->ike_sa));
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return SUCCESS;
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}
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/**
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* Implementation of task_t.process for initiator
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*/
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static status_t process_i(private_ike_rekey_t *this, message_t *message)
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{
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ike_sa_id_t *to_delete;
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enumerator_t *enumerator;
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payload_t *payload;
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/* handle NO_ADDITIONAL_SAS notify */
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enumerator = message->create_payload_enumerator(message);
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while (enumerator->enumerate(enumerator, &payload))
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{
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if (payload->get_type(payload) == NOTIFY)
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{
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notify_payload_t *notify = (notify_payload_t*)payload;
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if (notify->get_notify_type(notify) == NO_ADDITIONAL_SAS)
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{
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DBG1(DBG_IKE, "peer seems to not support IKE rekeying, "
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"starting reauthentication");
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this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
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charon->processor->queue_job(charon->processor,
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(job_t*)rekey_ike_sa_job_create(
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this->ike_sa->get_id(this->ike_sa), TRUE));
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enumerator->destroy(enumerator);
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return SUCCESS;
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}
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}
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}
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enumerator->destroy(enumerator);
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switch (this->ike_init->task.process(&this->ike_init->task, message))
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{
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case FAILED:
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/* rekeying failed, fallback to old SA */
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if (!(this->collision && (
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this->collision->get_type(this->collision) == IKE_DELETE ||
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this->collision->get_type(this->collision) == IKE_REAUTH)))
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{
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job_t *job;
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u_int32_t retry = RETRY_INTERVAL - (random() % RETRY_JITTER);
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job = (job_t*)rekey_ike_sa_job_create(
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this->ike_sa->get_id(this->ike_sa), FALSE);
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DBG1(DBG_IKE, "IKE_SA rekeying failed, "
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"trying again in %d seconds", retry);
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this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
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charon->scheduler->schedule_job(charon->scheduler, job, retry * 1000);
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}
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return SUCCESS;
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case NEED_MORE:
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/* bad dh group, try again */
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this->ike_init->task.migrate(&this->ike_init->task, this->new_sa);
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return NEED_MORE;
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default:
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break;
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}
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this->new_sa->set_state(this->new_sa, IKE_ESTABLISHED);
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DBG0(DBG_IKE, "IKE_SA %s[%d] established between %H[%D]...%H[%D]",
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this->new_sa->get_name(this->new_sa),
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this->new_sa->get_unique_id(this->new_sa),
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this->ike_sa->get_my_host(this->ike_sa),
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this->ike_sa->get_my_id(this->ike_sa),
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this->ike_sa->get_other_host(this->ike_sa),
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this->ike_sa->get_other_id(this->ike_sa));
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to_delete = this->ike_sa->get_id(this->ike_sa);
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/* check for collisions */
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if (this->collision &&
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this->collision->get_type(this->collision) == IKE_REKEY)
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{
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chunk_t this_nonce, other_nonce;
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host_t *host;
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private_ike_rekey_t *other = (private_ike_rekey_t*)this->collision;
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this_nonce = this->ike_init->get_lower_nonce(this->ike_init);
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other_nonce = other->ike_init->get_lower_nonce(other->ike_init);
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/* if we have the lower nonce, delete rekeyed SA. If not, delete
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* the redundant. */
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if (memcmp(this_nonce.ptr, other_nonce.ptr,
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min(this_nonce.len, other_nonce.len)) < 0)
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{
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DBG1(DBG_IKE, "IKE_SA rekey collision won, deleting rekeyed IKE_SA");
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charon->ike_sa_manager->checkin(charon->ike_sa_manager, other->new_sa);
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}
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else
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{
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DBG1(DBG_IKE, "IKE_SA rekey collision lost, deleting redundant IKE_SA");
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/* apply host for a proper delete */
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host = this->ike_sa->get_my_host(this->ike_sa);
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this->new_sa->set_my_host(this->new_sa, host->clone(host));
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host = this->ike_sa->get_other_host(this->ike_sa);
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this->new_sa->set_other_host(this->new_sa, host->clone(host));
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this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
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to_delete = this->new_sa->get_id(this->new_sa);
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charon->ike_sa_manager->checkin(charon->ike_sa_manager, this->new_sa);
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/* inherit to other->new_sa in destroy() */
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this->new_sa = other->new_sa;
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other->new_sa = NULL;
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}
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/* set threads active IKE_SA after checkin */
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charon->bus->set_sa(charon->bus, this->ike_sa);
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}
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/* rekeying successful, delete the IKE_SA using a subtask */
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this->ike_delete = ike_delete_create(this->ike_sa, TRUE);
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this->public.task.build = (status_t(*)(task_t*,message_t*))build_i_delete;
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this->public.task.process = (status_t(*)(task_t*,message_t*))process_i_delete;
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return NEED_MORE;
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}
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/**
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* Implementation of task_t.get_type
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*/
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static task_type_t get_type(private_ike_rekey_t *this)
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{
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return IKE_REKEY;
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}
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static void collide(private_ike_rekey_t* this, task_t *other)
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{
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DESTROY_IF(this->collision);
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this->collision = other;
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}
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/**
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* Implementation of task_t.migrate
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*/
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static void migrate(private_ike_rekey_t *this, ike_sa_t *ike_sa)
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{
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if (this->ike_init)
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{
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this->ike_init->task.destroy(&this->ike_init->task);
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}
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if (this->ike_delete)
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{
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this->ike_delete->task.destroy(&this->ike_delete->task);
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}
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if (this->new_sa)
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{
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charon->ike_sa_manager->checkin_and_destroy(charon->ike_sa_manager,
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this->new_sa);
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/* set threads active IKE_SA after checkin */
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charon->bus->set_sa(charon->bus, this->ike_sa);
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}
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DESTROY_IF(this->collision);
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this->collision = NULL;
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this->ike_sa = ike_sa;
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this->new_sa = NULL;
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this->ike_init = NULL;
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this->ike_delete = NULL;
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}
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/**
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* Implementation of task_t.destroy
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*/
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static void destroy(private_ike_rekey_t *this)
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{
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if (this->new_sa)
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{
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if (this->new_sa->get_state(this->new_sa) == IKE_ESTABLISHED &&
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this->new_sa->inherit(this->new_sa, this->ike_sa) != DESTROY_ME)
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{
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charon->ike_sa_manager->checkin(charon->ike_sa_manager, this->new_sa);
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}
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else
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{
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charon->ike_sa_manager->checkin_and_destroy(charon->ike_sa_manager,
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this->new_sa);
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}
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/* set threads active IKE_SA after checkin */
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charon->bus->set_sa(charon->bus, this->ike_sa);
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}
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if (this->ike_init)
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{
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this->ike_init->task.destroy(&this->ike_init->task);
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}
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if (this->ike_delete)
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{
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this->ike_delete->task.destroy(&this->ike_delete->task);
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}
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DESTROY_IF(this->collision);
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free(this);
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}
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/*
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* Described in header.
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*/
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ike_rekey_t *ike_rekey_create(ike_sa_t *ike_sa, bool initiator)
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{
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private_ike_rekey_t *this = malloc_thing(private_ike_rekey_t);
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this->public.collide = (void(*)(ike_rekey_t*,task_t*))collide;
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this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
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this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
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this->public.task.destroy = (void(*)(task_t*))destroy;
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if (initiator)
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{
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this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
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this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
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}
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else
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{
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this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
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this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
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}
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this->ike_sa = ike_sa;
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this->new_sa = NULL;
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this->ike_init = NULL;
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this->ike_delete = NULL;
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this->initiator = initiator;
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this->collision = NULL;
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return &this->public;
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}
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