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/*
* Copyright (C) 2011 Andreas Steffen
* Copyright (C) 2011 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_peap_avp.h"
#include <eap/eap.h>
#include <utils/debug.h>
/**
* Microsoft Success and Failure Result AVPs
*/
static const chunk_t MS_AVP_Success = chunk_from_chars(
0x80, 0x03, 0x00, 0x02, 0x00, 0x01);
static const chunk_t MS_AVP_Failure = chunk_from_chars(
0x80, 0x03, 0x00, 0x02, 0x00, 0x02);
typedef struct private_eap_peap_avp_t private_eap_peap_avp_t;
/**
* Private data of an eap_peap_avp_t object.
*/
struct private_eap_peap_avp_t {
/**
* Public eap_peap_avp_t interface.
*/
eap_peap_avp_t public;
/**
* EAP server or peer
*/
bool is_server;
};
METHOD(eap_peap_avp_t, build, void,
private_eap_peap_avp_t *this, bio_writer_t *writer, chunk_t data)
{
u_int8_t code;
eap_packet_t *pkt;
chunk_t avp_data;
pkt = (eap_packet_t*)data.ptr;
if (pkt->code == EAP_SUCCESS || pkt->code == EAP_FAILURE)
{
code = (this->is_server) ? EAP_REQUEST : EAP_RESPONSE;
writer->write_uint8(writer, code);
writer->write_uint8(writer, pkt->identifier);
writer->write_uint16(writer, 11);
writer->write_uint8(writer, EAP_MSTLV);
avp_data = (pkt->code == EAP_SUCCESS) ? MS_AVP_Success : MS_AVP_Failure;
}
else
{
avp_data = chunk_skip(data, 4);
}
writer->write_data(writer, avp_data);
}
METHOD(eap_peap_avp_t, process, status_t,
private_eap_peap_avp_t* this, bio_reader_t *reader, chunk_t *data,
u_int8_t identifier)
{
u_int8_t code;
u_int16_t len;
eap_packet_t *pkt;
chunk_t avp_data;
code = (this->is_server) ? EAP_RESPONSE : EAP_REQUEST;
len = reader->remaining(reader);
if (!reader->read_data(reader, len, &avp_data))
{
return FAILED;
}
pkt = (eap_packet_t*)avp_data.ptr;
if (len > 4 && pkt->code == code && untoh16(&pkt->length) == len)
{
if (len == 5 && pkt->type == EAP_IDENTITY)
{
DBG2(DBG_IKE, "uncompressed EAP Identity request");
*data = chunk_clone(avp_data);
return SUCCESS;
}
else if (len == 11 && pkt->type == EAP_MSTLV)
{
if (memeq(&pkt->data, MS_AVP_Success.ptr, MS_AVP_Success.len))
{
DBG2(DBG_IKE, "MS Success Result AVP");
code = EAP_SUCCESS;
}
else if (memeq(&pkt->data, MS_AVP_Failure.ptr, MS_AVP_Failure.len))
{
DBG2(DBG_IKE, "MS Failure Result AVP");
code = EAP_FAILURE;
}
else
{
DBG1(DBG_IKE, "unknown MS AVP message");
return FAILED;
}
identifier = pkt->identifier;
len = 0;
}
}
*data = chunk_alloc(4 + len);
pkt = (eap_packet_t*)data->ptr;
pkt->code = code;
pkt->identifier = identifier;
htoun16(&pkt->length, data->len);
memcpy(data->ptr + 4, avp_data.ptr, len);
return SUCCESS;
}
METHOD(eap_peap_avp_t, destroy, void,
private_eap_peap_avp_t *this)
{
free(this);
}
/**
* See header
*/
eap_peap_avp_t *eap_peap_avp_create(bool is_server)
{
private_eap_peap_avp_t *this;
INIT(this,
.public= {
.process = _process,
.build = _build,
.destroy = _destroy,
},
.is_server = is_server,
);
return &this->public;
}
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