153 lines
3.5 KiB
C
153 lines
3.5 KiB
C
/*
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* Copyright (C) 2011 Andreas Steffen
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* Copyright (C) 2011 HSR 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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#include "eap_peap_avp.h"
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#include <eap/eap.h>
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#include <utils/debug.h>
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/**
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* Microsoft Success and Failure Result AVPs
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*/
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static const chunk_t MS_AVP_Success = chunk_from_chars(
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0x80, 0x03, 0x00, 0x02, 0x00, 0x01);
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static const chunk_t MS_AVP_Failure = chunk_from_chars(
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0x80, 0x03, 0x00, 0x02, 0x00, 0x02);
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typedef struct private_eap_peap_avp_t private_eap_peap_avp_t;
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/**
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* Private data of an eap_peap_avp_t object.
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*/
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struct private_eap_peap_avp_t {
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/**
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* Public eap_peap_avp_t interface.
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*/
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eap_peap_avp_t public;
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/**
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* EAP server or peer
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*/
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bool is_server;
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};
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METHOD(eap_peap_avp_t, build, void,
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private_eap_peap_avp_t *this, bio_writer_t *writer, chunk_t data)
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{
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uint8_t code;
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eap_packet_t *pkt;
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chunk_t avp_data;
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pkt = (eap_packet_t*)data.ptr;
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if (pkt->code == EAP_SUCCESS || pkt->code == EAP_FAILURE)
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{
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code = (this->is_server) ? EAP_REQUEST : EAP_RESPONSE;
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writer->write_uint8(writer, code);
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writer->write_uint8(writer, pkt->identifier);
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writer->write_uint16(writer, 11);
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writer->write_uint8(writer, EAP_MSTLV);
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avp_data = (pkt->code == EAP_SUCCESS) ? MS_AVP_Success : MS_AVP_Failure;
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}
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else
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{
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avp_data = chunk_skip(data, 4);
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}
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writer->write_data(writer, avp_data);
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}
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METHOD(eap_peap_avp_t, process, status_t,
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private_eap_peap_avp_t* this, bio_reader_t *reader, chunk_t *data,
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uint8_t identifier)
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{
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uint8_t code;
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uint16_t len;
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eap_packet_t *pkt;
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chunk_t avp_data;
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code = (this->is_server) ? EAP_RESPONSE : EAP_REQUEST;
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len = reader->remaining(reader);
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if (!reader->read_data(reader, len, &avp_data))
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{
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return FAILED;
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}
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pkt = (eap_packet_t*)avp_data.ptr;
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if (len > 4 && pkt->code == code && untoh16(&pkt->length) == len)
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{
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if (len == 5 && pkt->type == EAP_IDENTITY)
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{
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DBG2(DBG_IKE, "uncompressed EAP Identity request");
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*data = chunk_clone(avp_data);
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return SUCCESS;
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}
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else if (len == 11 && pkt->type == EAP_MSTLV)
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{
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if (memeq(&pkt->data, MS_AVP_Success.ptr, MS_AVP_Success.len))
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{
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DBG2(DBG_IKE, "MS Success Result AVP");
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code = EAP_SUCCESS;
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}
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else if (memeq(&pkt->data, MS_AVP_Failure.ptr, MS_AVP_Failure.len))
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{
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DBG2(DBG_IKE, "MS Failure Result AVP");
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code = EAP_FAILURE;
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}
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else
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{
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DBG1(DBG_IKE, "unknown MS AVP message");
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return FAILED;
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}
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identifier = pkt->identifier;
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len = 0;
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}
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}
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*data = chunk_alloc(4 + len);
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pkt = (eap_packet_t*)data->ptr;
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pkt->code = code;
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pkt->identifier = identifier;
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htoun16(&pkt->length, data->len);
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memcpy(data->ptr + 4, avp_data.ptr, len);
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return SUCCESS;
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}
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METHOD(eap_peap_avp_t, destroy, void,
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private_eap_peap_avp_t *this)
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{
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free(this);
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}
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/**
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* See header
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*/
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eap_peap_avp_t *eap_peap_avp_create(bool is_server)
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{
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private_eap_peap_avp_t *this;
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INIT(this,
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.public= {
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.process = _process,
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.build = _build,
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.destroy = _destroy,
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},
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.is_server = is_server,
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);
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return &this->public;
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}
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