www.pudn.com > strongswan-4.2.4.rar > auth_payload.c
/*
* Copyright (C) 2005-2006 Martin Willi
* 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 .
*
* 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.
*
* $Id: auth_payload.c 4051 2008-06-10 09:08:27Z tobias $
*/
#include "auth_payload.h"
#include
typedef struct private_auth_payload_t private_auth_payload_t;
/**
* Private data of an auth_payload_t object.
*
*/
struct private_auth_payload_t {
/**
* Public auth_payload_t interface.
*/
auth_payload_t public;
/**
* Next payload type.
*/
u_int8_t next_payload;
/**
* Critical flag.
*/
bool critical;
/**
* Length of this payload.
*/
u_int16_t payload_length;
/**
* Method of the AUTH Data.
*/
u_int8_t auth_method;
/**
* The contained auth data value.
*/
chunk_t auth_data;
};
/**
* Encoding rules to parse or generate a AUTH payload
*
* The defined offsets are the positions in a object of type
* private_auth_payload_t.
*/
encoding_rule_t auth_payload_encodings[] = {
/* 1 Byte next payload type, stored in the field next_payload */
{ U_INT_8, offsetof(private_auth_payload_t, next_payload) },
/* the critical bit */
{ FLAG, offsetof(private_auth_payload_t, critical) },
/* 7 Bit reserved bits, nowhere stored */
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
{ RESERVED_BIT, 0 },
/* Length of the whole payload*/
{ PAYLOAD_LENGTH, offsetof(private_auth_payload_t, payload_length)},
/* 1 Byte AUTH type*/
{ U_INT_8, offsetof(private_auth_payload_t, auth_method) },
/* 3 reserved bytes */
{ RESERVED_BYTE, 0 },
{ RESERVED_BYTE, 0 },
{ RESERVED_BYTE, 0 },
/* some auth data bytes, length is defined in PAYLOAD_LENGTH */
{ AUTH_DATA, offsetof(private_auth_payload_t, auth_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 !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! Auth Method ! RESERVED !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! !
~ Authentication Data ~
! !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
/**
* Implementation of payload_t.verify.
*/
static status_t verify(private_auth_payload_t *this)
{
if (this->auth_method == 0 ||
(this->auth_method >= 4 && this->auth_method <= 8) ||
(this->auth_method >= 12 && this->auth_method <= 200))
{
/* reserved IDs */
return FAILED;
}
return SUCCESS;
}
/**
* Implementation of auth_payload_t.get_encoding_rules.
*/
static void get_encoding_rules(private_auth_payload_t *this, encoding_rule_t **rules, size_t *rule_count)
{
*rules = auth_payload_encodings;
*rule_count = sizeof(auth_payload_encodings) / sizeof(encoding_rule_t);
}
/**
* Implementation of payload_t.get_type.
*/
static payload_type_t get_payload_type(private_auth_payload_t *this)
{
return AUTHENTICATION;
}
/**
* Implementation of payload_t.get_next_type.
*/
static payload_type_t get_next_type(private_auth_payload_t *this)
{
return (this->next_payload);
}
/**
* Implementation of payload_t.set_next_type.
*/
static void set_next_type(private_auth_payload_t *this,payload_type_t type)
{
this->next_payload = type;
}
/**
* Implementation of payload_t.get_length.
*/
static size_t get_length(private_auth_payload_t *this)
{
return this->payload_length;
}
/**
* Implementation of auth_payload_t.set_auth_method.
*/
static void set_auth_method (private_auth_payload_t *this, auth_method_t method)
{
this->auth_method = method;
}
/**
* Implementation of auth_payload_t.get_auth_method.
*/
static auth_method_t get_auth_method (private_auth_payload_t *this)
{
return (this->auth_method);
}
/**
* Implementation of auth_payload_t.set_data.
*/
static void set_data (private_auth_payload_t *this, chunk_t data)
{
if (this->auth_data.ptr != NULL)
{
chunk_free(&(this->auth_data));
}
this->auth_data.ptr = clalloc(data.ptr,data.len);
this->auth_data.len = data.len;
this->payload_length = AUTH_PAYLOAD_HEADER_LENGTH + this->auth_data.len;
}
/**
* Implementation of auth_payload_t.get_data.
*/
static chunk_t get_data (private_auth_payload_t *this)
{
return (this->auth_data);
}
/**
* Implementation of auth_payload_t.get_data_clone.
*/
static chunk_t get_data_clone (private_auth_payload_t *this)
{
chunk_t cloned_data;
if (this->auth_data.ptr == NULL)
{
return (this->auth_data);
}
cloned_data.ptr = clalloc(this->auth_data.ptr,this->auth_data.len);
cloned_data.len = this->auth_data.len;
return cloned_data;
}
/**
* Implementation of payload_t.destroy and auth_payload_t.destroy.
*/
static void destroy(private_auth_payload_t *this)
{
if (this->auth_data.ptr != NULL)
{
chunk_free(&(this->auth_data));
}
free(this);
}
/*
* Described in header
*/
auth_payload_t *auth_payload_create()
{
private_auth_payload_t *this = malloc_thing(private_auth_payload_t);
/* interface functions */
this->public.payload_interface.verify = (status_t (*) (payload_t *))verify;
this->public.payload_interface.get_encoding_rules = (void (*) (payload_t *, encoding_rule_t **, size_t *) ) get_encoding_rules;
this->public.payload_interface.get_length = (size_t (*) (payload_t *)) get_length;
this->public.payload_interface.get_next_type = (payload_type_t (*) (payload_t *)) get_next_type;
this->public.payload_interface.set_next_type = (void (*) (payload_t *,payload_type_t)) set_next_type;
this->public.payload_interface.get_type = (payload_type_t (*) (payload_t *)) get_payload_type;
this->public.payload_interface.destroy = (void (*) (payload_t *))destroy;
/* public functions */
this->public.destroy = (void (*) (auth_payload_t *)) destroy;
this->public.set_auth_method = (void (*) (auth_payload_t *,auth_method_t)) set_auth_method;
this->public.get_auth_method = (auth_method_t (*) (auth_payload_t *)) get_auth_method;
this->public.set_data = (void (*) (auth_payload_t *,chunk_t)) set_data;
this->public.get_data_clone = (chunk_t (*) (auth_payload_t *)) get_data_clone;
this->public.get_data = (chunk_t (*) (auth_payload_t *)) get_data;
/* private variables */
this->critical = FALSE;
this->next_payload = NO_PAYLOAD;
this->payload_length =AUTH_PAYLOAD_HEADER_LENGTH;
this->auth_data = chunk_empty;
return (&(this->public));
}