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/*
* Copyright (C) 2005-2010 Martin Willi
* Copyright (C) 2010 revosec AG
* 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 <stddef.h>
#include "ke_payload.h"
#include <encoding/payloads/encodings.h>
typedef struct private_ke_payload_t private_ke_payload_t;
/**
* Private data of an ke_payload_t object.
*/
struct private_ke_payload_t {
/**
* Public ke_payload_t interface.
*/
ke_payload_t public;
/**
* Next payload type.
*/
u_int8_t next_payload;
/**
* Critical flag.
*/
bool critical;
/**
* Reserved bits
*/
bool reserved_bit[7];
/**
* Reserved bytes
*/
u_int8_t reserved_byte[2];
/**
* Length of this payload.
*/
u_int16_t payload_length;
/**
* DH Group Number.
*/
u_int16_t dh_group_number;
/**
* Key Exchange Data of this KE payload.
*/
chunk_t key_exchange_data;
};
/**
* Encoding rules to parse or generate a IKEv2-KE Payload.
*
* The defined offsets are the positions in a object of type
* private_ke_payload_t.
*/
encoding_rule_t ke_payload_encodings[] = {
/* 1 Byte next payload type, stored in the field next_payload */
{ U_INT_8, offsetof(private_ke_payload_t, next_payload) },
/* the critical bit */
{ FLAG, offsetof(private_ke_payload_t, critical) },
/* 7 Bit reserved bits */
{ RESERVED_BIT, offsetof(private_ke_payload_t, reserved_bit[0]) },
{ RESERVED_BIT, offsetof(private_ke_payload_t, reserved_bit[1]) },
{ RESERVED_BIT, offsetof(private_ke_payload_t, reserved_bit[2]) },
{ RESERVED_BIT, offsetof(private_ke_payload_t, reserved_bit[3]) },
{ RESERVED_BIT, offsetof(private_ke_payload_t, reserved_bit[4]) },
{ RESERVED_BIT, offsetof(private_ke_payload_t, reserved_bit[5]) },
{ RESERVED_BIT, offsetof(private_ke_payload_t, reserved_bit[6]) },
/* Length of the whole payload*/
{ PAYLOAD_LENGTH, offsetof(private_ke_payload_t, payload_length) },
/* DH Group number as 16 bit field*/
{ U_INT_16, offsetof(private_ke_payload_t, dh_group_number) },
/* 2 reserved bytes */
{ RESERVED_BYTE, offsetof(private_ke_payload_t, reserved_byte[0])},
{ RESERVED_BYTE, offsetof(private_ke_payload_t, reserved_byte[1])},
/* Key Exchange Data is from variable size */
{ KEY_EXCHANGE_DATA, offsetof(private_ke_payload_t, key_exchange_data)}
};
/*
1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! Next Payload !C! RESERVED ! Payload Length !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! DH Group # ! RESERVED !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! !
~ Key Exchange Data ~
! !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
METHOD(payload_t, verify, status_t,
private_ke_payload_t *this)
{
return SUCCESS;
}
METHOD(payload_t, get_encoding_rules, void,
private_ke_payload_t *this, encoding_rule_t **rules, size_t *rule_count)
{
*rules = ke_payload_encodings;
*rule_count = countof(ke_payload_encodings);
}
METHOD(payload_t, get_type, payload_type_t,
private_ke_payload_t *this)
{
return KEY_EXCHANGE;
}
METHOD(payload_t, get_next_type, payload_type_t,
private_ke_payload_t *this)
{
return this->next_payload;
}
METHOD(payload_t, set_next_type, void,
private_ke_payload_t *this,payload_type_t type)
{
this->next_payload = type;
}
METHOD(payload_t, get_length, size_t,
private_ke_payload_t *this)
{
return this->payload_length;
}
METHOD(ke_payload_t, get_key_exchange_data, chunk_t,
private_ke_payload_t *this)
{
return this->key_exchange_data;
}
METHOD(ke_payload_t, get_dh_group_number, diffie_hellman_group_t,
private_ke_payload_t *this)
{
return this->dh_group_number;
}
METHOD2(payload_t, ke_payload_t, destroy, void,
private_ke_payload_t *this)
{
free(this->key_exchange_data.ptr);
free(this);
}
/*
* Described in header
*/
ke_payload_t *ke_payload_create()
{
private_ke_payload_t *this;
INIT(this,
.public = {
.payload_interface = {
.verify = _verify,
.get_encoding_rules = _get_encoding_rules,
.get_length = _get_length,
.get_next_type = _get_next_type,
.set_next_type = _set_next_type,
.get_type = _get_type,
.destroy = _destroy,
},
.get_key_exchange_data = _get_key_exchange_data,
.get_dh_group_number = _get_dh_group_number,
.destroy = _destroy,
},
.next_payload = NO_PAYLOAD,
.payload_length = KE_PAYLOAD_HEADER_LENGTH,
.dh_group_number = MODP_NONE,
);
return &this->public;
}
/*
* Described in header
*/
ke_payload_t *ke_payload_create_from_diffie_hellman(diffie_hellman_t *dh)
{
private_ke_payload_t *this = (private_ke_payload_t*)ke_payload_create();
dh->get_my_public_value(dh, &this->key_exchange_data);
this->dh_group_number = dh->get_dh_group(dh);
this->payload_length = this->key_exchange_data.len + KE_PAYLOAD_HEADER_LENGTH;
return &this->public;
}
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