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/*
* Copyright (C) 2010 Andreas Steffen
* 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 "eap_tnc.h"
#include <tls_eap.h>
#include <daemon.h>
#include <debug.h>
typedef struct private_eap_tnc_t private_eap_tnc_t;
/**
* Private data of an eap_tnc_t object.
*/
struct private_eap_tnc_t {
/**
* Public authenticator_t interface.
*/
eap_tnc_t public;
/**
* TLS stack, wrapped by EAP helper
*/
tls_eap_t *tls_eap;
};
/** Maximum number of EAP-TNC messages/fragments allowed */
#define MAX_MESSAGE_COUNT 10
/** Default size of a EAP-TNC fragment */
#define MAX_FRAGMENT_LEN 50000
METHOD(eap_method_t, initiate, status_t,
private_eap_tnc_t *this, eap_payload_t **out)
{
chunk_t data;
if (this->tls_eap->initiate(this->tls_eap, &data) == NEED_MORE)
{
*out = eap_payload_create_data(data);
free(data.ptr);
return NEED_MORE;
}
return FAILED;
}
METHOD(eap_method_t, process, status_t,
private_eap_tnc_t *this, eap_payload_t *in, eap_payload_t **out)
{
status_t status;
chunk_t data;
data = in->get_data(in);
status = this->tls_eap->process(this->tls_eap, data, &data);
if (status == NEED_MORE)
{
*out = eap_payload_create_data(data);
free(data.ptr);
}
return status;
}
METHOD(eap_method_t, get_type, eap_type_t,
private_eap_tnc_t *this, u_int32_t *vendor)
{
*vendor = 0;
return EAP_TNC;
}
METHOD(eap_method_t, get_msk, status_t,
private_eap_tnc_t *this, chunk_t *msk)
{
*msk = this->tls_eap->get_msk(this->tls_eap);
if (msk->len)
{
return SUCCESS;
}
return FAILED;
}
METHOD(eap_method_t, get_identifier, u_int8_t,
private_eap_tnc_t *this)
{
return this->tls_eap->get_identifier(this->tls_eap);
}
METHOD(eap_method_t, set_identifier, void,
private_eap_tnc_t *this, u_int8_t identifier)
{
this->tls_eap->set_identifier(this->tls_eap, identifier);
}
METHOD(eap_method_t, is_mutual, bool,
private_eap_tnc_t *this)
{
return FALSE;
}
METHOD(eap_method_t, destroy, void,
private_eap_tnc_t *this)
{
this->tls_eap->destroy(this->tls_eap);
free(this);
}
/**
* Generic private constructor
*/
static eap_tnc_t *eap_tnc_create(identification_t *server,
identification_t *peer, bool is_server)
{
private_eap_tnc_t *this;
size_t frag_size;
int max_msg_count;
bool include_length;
char* protocol;
tnccs_type_t type;
tnccs_t *tnccs;
INIT(this,
.public = {
.eap_method = {
.initiate = _initiate,
.process = _process,
.get_type = _get_type,
.is_mutual = _is_mutual,
.get_msk = _get_msk,
.get_identifier = _get_identifier,
.set_identifier = _set_identifier,
.destroy = _destroy,
},
},
);
frag_size = lib->settings->get_int(lib->settings,
"charon.plugins.eap-tnc.fragment_size", MAX_FRAGMENT_LEN);
max_msg_count = lib->settings->get_int(lib->settings,
"charon.plugins.eap-tnc.max_message_count", MAX_MESSAGE_COUNT);
include_length = lib->settings->get_bool(lib->settings,
"charon.plugins.eap-tnc.include_length", TRUE);
protocol = lib->settings->get_str(lib->settings,
"charon.plugins.eap-tnc.protocol", "tnccs-1.1");
if (strcaseeq(protocol, "tnccs-2.0"))
{
type = TNCCS_2_0;
}
else if (strcaseeq(protocol, "tnccs-1.1"))
{
type = TNCCS_1_1;
}
else if (strcaseeq(protocol, "tnccs-dynamic") && is_server)
{
type = TNCCS_DYNAMIC;
}
else
{
DBG1(DBG_TNC, "TNCCS protocol '%s' not supported", protocol);
free(this);
return NULL;
}
tnccs = charon->tnccs->create_instance(charon->tnccs, type, is_server);
this->tls_eap = tls_eap_create(EAP_TNC, (tls_t*)tnccs, frag_size,
max_msg_count, include_length);
if (!this->tls_eap)
{
free(this);
return NULL;
}
return &this->public;
}
eap_tnc_t *eap_tnc_create_server(identification_t *server,
identification_t *peer)
{
return eap_tnc_create(server, peer, TRUE);
}
eap_tnc_t *eap_tnc_create_peer(identification_t *server,
identification_t *peer)
{
return eap_tnc_create(server, peer, FALSE);
}
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