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/*
* Copyright (C) 2010 Martin Willi
* Copyright (C) 2010 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 "tls_protection.h"
#include <utils/debug.h>
typedef struct private_tls_protection_t private_tls_protection_t;
/**
* Private data of an tls_protection_t object.
*/
struct private_tls_protection_t {
/**
* Public tls_protection_t interface.
*/
tls_protection_t public;
/**
* negotiated TLS version
*/
tls_version_t version;
/**
* Upper layer, TLS record compression
*/
tls_compression_t *compression;
/**
* TLS alert handler
*/
tls_alert_t *alert;
/**
* Sequence number of incoming records
*/
uint64_t seq_in;
/**
* Sequence number for outgoing records
*/
uint64_t seq_out;
/**
* AEAD transform for inbound traffic
*/
tls_aead_t *aead_in;
/**
* AEAD transform for outbound traffic
*/
tls_aead_t *aead_out;
};
METHOD(tls_protection_t, process, status_t,
private_tls_protection_t *this, tls_content_type_t type, chunk_t data)
{
if (this->alert->fatal(this->alert))
{ /* don't accept more input, fatal error occurred */
return NEED_MORE;
}
if (this->aead_in)
{
if (!this->aead_in->decrypt(this->aead_in, this->version,
type, this->seq_in, &data))
{
DBG1(DBG_TLS, "TLS record decryption failed");
this->alert->add(this->alert, TLS_FATAL, TLS_BAD_RECORD_MAC);
return NEED_MORE;
}
}
if (type == TLS_CHANGE_CIPHER_SPEC)
{
this->seq_in = 0;
}
else
{
this->seq_in++;
}
return this->compression->process(this->compression, type, data);
}
METHOD(tls_protection_t, build, status_t,
private_tls_protection_t *this, tls_content_type_t *type, chunk_t *data)
{
status_t status;
status = this->compression->build(this->compression, type, data);
if (status == NEED_MORE)
{
if (*type == TLS_CHANGE_CIPHER_SPEC)
{
this->seq_out = 0;
return status;
}
if (this->aead_out)
{
if (!this->aead_out->encrypt(this->aead_out, this->version,
*type, this->seq_out, data))
{
DBG1(DBG_TLS, "TLS record encryption failed");
chunk_free(data);
return FAILED;
}
}
this->seq_out++;
}
return status;
}
METHOD(tls_protection_t, set_cipher, void,
private_tls_protection_t *this, bool inbound, tls_aead_t *aead)
{
if (inbound)
{
this->aead_in = aead;
}
else
{
this->aead_out = aead;
}
}
METHOD(tls_protection_t, set_version, void,
private_tls_protection_t *this, tls_version_t version)
{
this->version = version;
}
METHOD(tls_protection_t, destroy, void,
private_tls_protection_t *this)
{
free(this);
}
/**
* See header
*/
tls_protection_t *tls_protection_create(tls_compression_t *compression,
tls_alert_t *alert)
{
private_tls_protection_t *this;
INIT(this,
.public = {
.process = _process,
.build = _build,
.set_cipher = _set_cipher,
.set_version = _set_version,
.destroy = _destroy,
},
.alert = alert,
.compression = compression,
);
return &this->public;
}
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