/*
* Copyright (C) 2011 Martin Willi
* Copyright (C) 2011 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 "psk_v1_authenticator.h"
#include <daemon.h>
#include <sa/ikev1/keymat_v1.h>
#include <encoding/payloads/hash_payload.h>
typedef struct private_psk_v1_authenticator_t private_psk_v1_authenticator_t;
/**
* Private data of an psk_v1_authenticator_t object.
*/
struct private_psk_v1_authenticator_t {
/**
* Public authenticator_t interface.
*/
psk_v1_authenticator_t public;
/**
* Assigned IKE_SA
*/
ike_sa_t *ike_sa;
/**
* TRUE if we are initiator
*/
bool initiator;
/**
* DH key exchange
*/
diffie_hellman_t *dh;
/**
* Others DH public value
*/
chunk_t dh_value;
/**
* Encoded SA payload, without fixed header
*/
chunk_t sa_payload;
/**
* Encoded ID payload, without fixed header
*/
chunk_t id_payload;
/**
* Used for Hybrid authentication to build hash without PSK?
*/
bool hybrid;
};
METHOD(authenticator_t, build, status_t,
private_psk_v1_authenticator_t *this, message_t *message)
{
hash_payload_t *hash_payload;
keymat_v1_t *keymat;
chunk_t hash, dh;
if (!this->dh->get_my_public_value(this->dh, &dh))
{
return FAILED;
}
keymat = (keymat_v1_t*)this->ike_sa->get_keymat(this->ike_sa);
if (!keymat->get_hash(keymat, this->initiator, dh, this->dh_value,
this->ike_sa->get_id(this->ike_sa), this->sa_payload,
this->id_payload, &hash, NULL))
{
free(dh.ptr);
return FAILED;
}
free(dh.ptr);
hash_payload = hash_payload_create(PLV1_HASH);
hash_payload->set_hash(hash_payload, hash);
message->add_payload(message, &hash_payload->payload_interface);
free(hash.ptr);
return SUCCESS;
}
METHOD(authenticator_t, process, status_t,
private_psk_v1_authenticator_t *this, message_t *message)
{
hash_payload_t *hash_payload;
keymat_v1_t *keymat;
chunk_t hash, dh;
auth_cfg_t *auth;
hash_payload = (hash_payload_t*)message->get_payload(message, PLV1_HASH);
if (!hash_payload)
{
DBG1(DBG_IKE, "HASH payload missing in message");
return FAILED;
}
if (!this->dh->get_my_public_value(this->dh, &dh))
{
return FAILED;
}
keymat = (keymat_v1_t*)this->ike_sa->get_keymat(this->ike_sa);
if (!keymat->get_hash(keymat, !this->initiator, this->dh_value, dh,
this->ike_sa->get_id(this->ike_sa), this->sa_payload,
this->id_payload, &hash, NULL))
{
free(dh.ptr);
return FAILED;
}
free(dh.ptr);
if (chunk_equals_const(hash, hash_payload->get_hash(hash_payload)))
{
free(hash.ptr);
if (!this->hybrid)
{
auth = this->ike_sa->get_auth_cfg(this->ike_sa, FALSE);
auth->add(auth, AUTH_RULE_AUTH_CLASS, AUTH_CLASS_PSK);
}
return SUCCESS;
}
free(hash.ptr);
DBG1(DBG_IKE, "calculated HASH does not match HASH payload");
return FAILED;
}
METHOD(authenticator_t, destroy, void,
private_psk_v1_authenticator_t *this)
{
chunk_free(&this->id_payload);
free(this);
}
/*
* Described in header.
*/
psk_v1_authenticator_t *psk_v1_authenticator_create(ike_sa_t *ike_sa,
bool initiator, diffie_hellman_t *dh,
chunk_t dh_value, chunk_t sa_payload,
chunk_t id_payload, bool hybrid)
{
private_psk_v1_authenticator_t *this;
INIT(this,
.public = {
.authenticator = {
.build = _build,
.process = _process,
.is_mutual = (void*)return_false,
.destroy = _destroy,
},
},
.ike_sa = ike_sa,
.initiator = initiator,
.dh = dh,
.dh_value = dh_value,
.sa_payload = sa_payload,
.id_payload = id_payload,
.hybrid = hybrid,
);
return &this->public;
}
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