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/*
* Copyright (C) 2005-2009 Martin Willi
* Copyright (C) 2005 Jan Hutter
* 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 "psk_authenticator.h"
#include <daemon.h>
#include <encoding/payloads/auth_payload.h>
typedef struct private_psk_authenticator_t private_psk_authenticator_t;
/**
* Private data of an psk_authenticator_t object.
*/
struct private_psk_authenticator_t {
/**
* Public authenticator_t interface.
*/
psk_authenticator_t public;
/**
* Assigned IKE_SA
*/
ike_sa_t *ike_sa;
/**
* nonce to include in AUTH calculation
*/
chunk_t nonce;
/**
* IKE_SA_INIT message data to include in AUTH calculation
*/
chunk_t ike_sa_init;
};
/*
* Implementation of authenticator_t.build for builder
*/
static status_t build(private_psk_authenticator_t *this, message_t *message)
{
identification_t *my_id, *other_id;
auth_payload_t *auth_payload;
shared_key_t *key;
chunk_t auth_data;
keymat_t *keymat;
keymat = this->ike_sa->get_keymat(this->ike_sa);
my_id = this->ike_sa->get_my_id(this->ike_sa);
other_id = this->ike_sa->get_other_id(this->ike_sa);
DBG1(DBG_IKE, "authentication of '%Y' (myself) with %N",
my_id, auth_method_names, AUTH_PSK);
key = lib->credmgr->get_shared(lib->credmgr, SHARED_IKE, my_id, other_id);
if (key == NULL)
{
DBG1(DBG_IKE, "no shared key found for '%Y' - '%Y'", my_id, other_id);
return NOT_FOUND;
}
auth_data = keymat->get_psk_sig(keymat, FALSE, this->ike_sa_init,
this->nonce, key->get_key(key), my_id);
key->destroy(key);
DBG2(DBG_IKE, "successfully created shared key MAC");
auth_payload = auth_payload_create();
auth_payload->set_auth_method(auth_payload, AUTH_PSK);
auth_payload->set_data(auth_payload, auth_data);
chunk_free(&auth_data);
message->add_payload(message, (payload_t*)auth_payload);
return SUCCESS;
}
/**
* Implementation of authenticator_t.process for verifier
*/
static status_t process(private_psk_authenticator_t *this, message_t *message)
{
chunk_t auth_data, recv_auth_data;
identification_t *my_id, *other_id;
auth_payload_t *auth_payload;
auth_cfg_t *auth;
shared_key_t *key;
enumerator_t *enumerator;
bool authenticated = FALSE;
int keys_found = 0;
keymat_t *keymat;
auth_payload = (auth_payload_t*)message->get_payload(message, AUTHENTICATION);
if (!auth_payload)
{
return FAILED;
}
keymat = this->ike_sa->get_keymat(this->ike_sa);
recv_auth_data = auth_payload->get_data(auth_payload);
my_id = this->ike_sa->get_my_id(this->ike_sa);
other_id = this->ike_sa->get_other_id(this->ike_sa);
enumerator = lib->credmgr->create_shared_enumerator(lib->credmgr,
SHARED_IKE, my_id, other_id);
while (!authenticated && enumerator->enumerate(enumerator, &key, NULL, NULL))
{
keys_found++;
auth_data = keymat->get_psk_sig(keymat, TRUE, this->ike_sa_init,
this->nonce, key->get_key(key), other_id);
if (auth_data.len && chunk_equals(auth_data, recv_auth_data))
{
DBG1(DBG_IKE, "authentication of '%Y' with %N successful",
other_id, auth_method_names, AUTH_PSK);
authenticated = TRUE;
}
chunk_free(&auth_data);
}
enumerator->destroy(enumerator);
if (!authenticated)
{
if (keys_found == 0)
{
DBG1(DBG_IKE, "no shared key found for '%Y' - '%Y'", my_id, other_id);
return NOT_FOUND;
}
DBG1(DBG_IKE, "tried %d shared key%s for '%Y' - '%Y', but MAC mismatched",
keys_found, keys_found == 1 ? "" : "s", my_id, other_id);
return FAILED;
}
auth = this->ike_sa->get_auth_cfg(this->ike_sa, FALSE);
auth->add(auth, AUTH_RULE_AUTH_CLASS, AUTH_CLASS_PSK);
return SUCCESS;
}
/**
* Implementation of authenticator_t.process for builder
* Implementation of authenticator_t.build for verifier
*/
static status_t return_failed()
{
return FAILED;
}
/**
* Implementation of authenticator_t.destroy.
*/
static void destroy(private_psk_authenticator_t *this)
{
free(this);
}
/*
* Described in header.
*/
psk_authenticator_t *psk_authenticator_create_builder(ike_sa_t *ike_sa,
chunk_t received_nonce, chunk_t sent_init)
{
private_psk_authenticator_t *this = malloc_thing(private_psk_authenticator_t);
this->public.authenticator.build = (status_t(*)(authenticator_t*, message_t *message))build;
this->public.authenticator.process = (status_t(*)(authenticator_t*, message_t *message))return_failed;
this->public.authenticator.is_mutual = (bool(*)(authenticator_t*))return_false;
this->public.authenticator.destroy = (void(*)(authenticator_t*))destroy;
this->ike_sa = ike_sa;
this->ike_sa_init = sent_init;
this->nonce = received_nonce;
return &this->public;
}
/*
* Described in header.
*/
psk_authenticator_t *psk_authenticator_create_verifier(ike_sa_t *ike_sa,
chunk_t sent_nonce, chunk_t received_init)
{
private_psk_authenticator_t *this = malloc_thing(private_psk_authenticator_t);
this->public.authenticator.build = (status_t(*)(authenticator_t*, message_t *messageh))return_failed;
this->public.authenticator.process = (status_t(*)(authenticator_t*, message_t *message))process;
this->public.authenticator.is_mutual = (bool(*)(authenticator_t*))return_false;
this->public.authenticator.destroy = (void(*)(authenticator_t*))destroy;
this->ike_sa = ike_sa;
this->ike_sa_init = received_init;
this->nonce = sent_nonce;
return &this->public;
}
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