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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 "nonce_payload.h"
#include <daemon.h>
#include <encoding/payloads/encodings.h>
typedef struct private_nonce_payload_t private_nonce_payload_t;
/**
* Private data of an nonce_payload_t object.
*/
struct private_nonce_payload_t {
/**
* Public nonce_payload_t interface.
*/
nonce_payload_t public;
/**
* Next payload type.
*/
u_int8_t next_payload;
/**
* Critical flag.
*/
bool critical;
/**
* Reserved bits
*/
bool reserved[7];
/**
* Length of this payload.
*/
u_int16_t payload_length;
/**
* The contained nonce value.
*/
chunk_t nonce;
/**
* Payload type, NONCE or NONCE_V1
*/
payload_type_t type;
};
/**
* Encoding rules to parse or generate a nonce payload
*
* The defined offsets are the positions in a object of type
* private_nonce_payload_t.
*/
static encoding_rule_t encodings[] = {
/* 1 Byte next payload type, stored in the field next_payload */
{ U_INT_8, offsetof(private_nonce_payload_t, next_payload) },
/* the critical bit */
{ FLAG, offsetof(private_nonce_payload_t, critical) },
/* 7 Bit reserved bits */
{ RESERVED_BIT, offsetof(private_nonce_payload_t, reserved[0]) },
{ RESERVED_BIT, offsetof(private_nonce_payload_t, reserved[1]) },
{ RESERVED_BIT, offsetof(private_nonce_payload_t, reserved[2]) },
{ RESERVED_BIT, offsetof(private_nonce_payload_t, reserved[3]) },
{ RESERVED_BIT, offsetof(private_nonce_payload_t, reserved[4]) },
{ RESERVED_BIT, offsetof(private_nonce_payload_t, reserved[5]) },
{ RESERVED_BIT, offsetof(private_nonce_payload_t, reserved[6]) },
/* Length of the whole nonce payload*/
{ PAYLOAD_LENGTH, offsetof(private_nonce_payload_t, payload_length) },
/* some nonce bytes, lenth is defined in PAYLOAD_LENGTH */
{ CHUNK_DATA, offsetof(private_nonce_payload_t, nonce) },
};
/* 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 !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! !
~ Nonce Data ~
! !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
METHOD(payload_t, verify, status_t,
private_nonce_payload_t *this)
{
bool bad_length = FALSE;
if (this->nonce.len > 256)
{
bad_length = TRUE;
}
if (this->type == NONCE &&
this->nonce.len < 16)
{
bad_length = TRUE;
}
if (this->type == NONCE_V1 &&
this->nonce.len < 8)
{
bad_length = TRUE;
}
if (bad_length)
{
DBG1(DBG_ENC, "%N payload has invalid length (%d bytes)",
payload_type_names, this->type, this->nonce.len);
return FAILED;
}
return SUCCESS;
}
METHOD(payload_t, get_encoding_rules, int,
private_nonce_payload_t *this, encoding_rule_t **rules)
{
*rules = encodings;
return countof(encodings);
}
METHOD(payload_t, get_header_length, int,
private_nonce_payload_t *this)
{
return 4;
}
METHOD(payload_t, get_type, payload_type_t,
private_nonce_payload_t *this)
{
return this->type;
}
METHOD(payload_t, get_next_type, payload_type_t,
private_nonce_payload_t *this)
{
return this->next_payload;
}
METHOD(payload_t, set_next_type, void,
private_nonce_payload_t *this, payload_type_t type)
{
this->next_payload = type;
}
METHOD(payload_t, get_length, size_t,
private_nonce_payload_t *this)
{
return this->payload_length;
}
METHOD(nonce_payload_t, set_nonce, void,
private_nonce_payload_t *this, chunk_t nonce)
{
this->nonce = chunk_clone(nonce);
this->payload_length = get_header_length(this) + nonce.len;
}
METHOD(nonce_payload_t, get_nonce, chunk_t,
private_nonce_payload_t *this)
{
return chunk_clone(this->nonce);
}
METHOD2(payload_t, nonce_payload_t, destroy, void,
private_nonce_payload_t *this)
{
free(this->nonce.ptr);
free(this);
}
/*
* Described in header
*/
nonce_payload_t *nonce_payload_create(payload_type_t type)
{
private_nonce_payload_t *this;
INIT(this,
.public = {
.payload_interface = {
.verify = _verify,
.get_encoding_rules = _get_encoding_rules,
.get_header_length = _get_header_length,
.get_length = _get_length,
.get_next_type = _get_next_type,
.set_next_type = _set_next_type,
.get_type = _get_type,
.destroy = _destroy,
},
.set_nonce = _set_nonce,
.get_nonce = _get_nonce,
.destroy = _destroy,
},
.next_payload = NO_PAYLOAD,
.payload_length = get_header_length(this),
.type = type,
);
return &this->public;
}
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