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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 <string.h>
#include <stddef.h>
#include <stdint.h>
#include "transform_attribute.h"
#include <encoding/payloads/encodings.h>
#include <library.h>
ENUM(tattr_ph1_names, TATTR_PH1_ENCRYPTION_ALGORITHM, TATTR_PH1_GROUP_ORDER,
"ENCRYPTION_ALGORITHM",
"HASH_ALGORITHM",
"AUTH_METHOD",
"GROUP",
"GROUP_TYPE",
"GROUP_PRIME",
"GROUP_GENONE",
"GROUP_GENTWO",
"GROUP_CURVE_A",
"GROUP_CURVE_B",
"LIFE_TYPE",
"LIFE_DURATION",
"PRF",
"KEY_LENGTH",
"FIELD_SIZE",
"GROUP_ORDER",
);
ENUM(tattr_ph2_names, TATTR_PH2_SA_LIFE_TYPE, TATTR_PH2_EXT_SEQ_NUMBER,
"SA_LIFE_TYPE",
"SA_LIFE_DURATION",
"GROUP",
"ENCAP_MODE",
"AUTH_ALGORITHM",
"KEY_LENGTH",
"KEY_ROUNDS",
"COMP_DICT_SIZE",
"COMP_PRIV_ALGORITHM",
"ECN_TUNNEL",
"EXT_SEQ_NUMBER",
);
ENUM(tattr_ikev2_names, TATTR_IKEV2_KEY_LENGTH, TATTR_IKEV2_KEY_LENGTH,
"KEY_LENGTH",
);
typedef struct private_transform_attribute_t private_transform_attribute_t;
/**
* Private data of an transform_attribute_t object.
*/
struct private_transform_attribute_t {
/**
* Public transform_attribute_t interface.
*/
transform_attribute_t public;
/**
* Attribute Format Flag.
*
* - TRUE means value is stored in attribute_length_or_value
* - FALSE means value is stored in attribute_value
*/
bool attribute_format;
/**
* Type of the attribute.
*/
u_int16_t attribute_type;
/**
* Attribute Length if attribute_format is 0, attribute Value otherwise.
*/
u_int16_t attribute_length_or_value;
/**
* Attribute value as chunk if attribute_format is 0 (FALSE).
*/
chunk_t attribute_value;
/**
* Payload type, TRANSFORM_ATTRIBUTE or TRANSFORM_ATTRIBUTE_V1
*/
payload_type_t type;
};
/**
* Encoding rules for IKEv1/IKEv2 transform attributes
*/
static encoding_rule_t encodings[] = {
/* Flag defining the format of this payload */
{ ATTRIBUTE_FORMAT, offsetof(private_transform_attribute_t, attribute_format) },
/* type of the attribute as 15 bit unsigned integer */
{ ATTRIBUTE_TYPE, offsetof(private_transform_attribute_t, attribute_type) },
/* Length or value, depending on the attribute format flag */
{ ATTRIBUTE_LENGTH_OR_VALUE,offsetof(private_transform_attribute_t, attribute_length_or_value) },
/* Value of attribute if attribute format flag is zero */
{ ATTRIBUTE_VALUE, offsetof(private_transform_attribute_t, attribute_value) }
};
/*
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
!A! Attribute Type ! AF=0 Attribute Length !
!F! ! AF=1 Attribute Value !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! AF=0 Attribute Value !
! AF=1 Not Transmitted !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
METHOD(payload_t, verify, status_t,
private_transform_attribute_t *this)
{
return SUCCESS;
}
METHOD(payload_t, get_encoding_rules, int,
private_transform_attribute_t *this, encoding_rule_t **rules)
{
*rules = encodings;
return countof(encodings);
}
METHOD(payload_t, get_header_length, int,
private_transform_attribute_t *this)
{
return 0;
}
METHOD(payload_t, get_type, payload_type_t,
private_transform_attribute_t *this)
{
return this->type;
}
METHOD(payload_t, get_next_type, payload_type_t,
private_transform_attribute_t *this)
{
return NO_PAYLOAD;
}
METHOD(payload_t, set_next_type, void,
private_transform_attribute_t *this, payload_type_t type)
{
}
METHOD(payload_t, get_length, size_t,
private_transform_attribute_t *this)
{
if (this->attribute_format)
{
return 4;
}
return this->attribute_length_or_value + 4;
}
METHOD(transform_attribute_t, get_value_chunk, chunk_t,
private_transform_attribute_t *this)
{
if (this->attribute_format)
{
return chunk_from_thing(this->attribute_length_or_value);
}
return this->attribute_value;
}
METHOD(transform_attribute_t, get_value, u_int64_t,
private_transform_attribute_t *this)
{
u_int64_t value = 0;
if (this->attribute_format)
{
return this->attribute_length_or_value;
}
if (this->attribute_value.len > sizeof(value))
{
return UINT64_MAX;
}
memcpy(((char*)&value) + sizeof(value) - this->attribute_value.len,
this->attribute_value.ptr, this->attribute_value.len);
return untoh64((char*)&value);
}
METHOD(transform_attribute_t, get_attribute_type, u_int16_t,
private_transform_attribute_t *this)
{
return this->attribute_type;
}
METHOD2(payload_t, transform_attribute_t, destroy, void,
private_transform_attribute_t *this)
{
free(this->attribute_value.ptr);
free(this);
}
/*
* Described in header.
*/
transform_attribute_t *transform_attribute_create(payload_type_t type)
{
private_transform_attribute_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,
},
.get_value_chunk = _get_value_chunk,
.get_value = _get_value,
.get_attribute_type = _get_attribute_type,
.destroy = _destroy,
},
.attribute_format = FALSE,
.type = type,
);
return &this->public;
}
/*
* Described in header.
*/
transform_attribute_t *transform_attribute_create_value(payload_type_t type,
transform_attribute_type_t kind, u_int64_t value)
{
private_transform_attribute_t *this;
this = (private_transform_attribute_t*)transform_attribute_create(type);
this->attribute_type = kind & 0x7FFF;
if (value <= UINT16_MAX)
{
this->attribute_length_or_value = value;
this->attribute_format = TRUE;
}
else if (value <= UINT32_MAX)
{
u_int32_t val32;
val32 = htonl(value);
this->attribute_value = chunk_clone(chunk_from_thing(val32));
this->attribute_length_or_value = sizeof(val32);
}
else
{
htoun64(&value, value);
this->attribute_value = chunk_clone(chunk_from_thing(value));
this->attribute_length_or_value = sizeof(value);
}
return &this->public;
}
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