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/*
* Copyright (C) 2008 Martin Willi
* 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.
*/
/**
* @defgroup eap_aka_i eap_aka
* @{ @ingroup eap_aka
*/
#ifndef EAP_AKA_H_
#define EAP_AKA_H_
typedef struct eap_aka_t eap_aka_t;
#include <sa/authenticators/eap/eap_method.h>
/** check SEQ values as client for validity, disabled by default */
#ifndef SEQ_CHECK
# define SEQ_CHECK 0
#endif
/**
* Implementation of the eap_method_t interface using EAP-AKA.
*
* EAP-AKA uses 3rd generation mobile phone standard authentication
* mechanism for authentication. It is a mutual authentication
* mechanism which establishs a shared key and therefore supports EAP_ONLY
* authentication. This implementation follows the standard of the
* 3GPP2 (S.S0055) and not the one of 3GGP.
* The shared key used for authentication is from ipsec.secrets. The
* peers ID is used to query it.
* The AKA mechanism uses sequence numbers to detect replay attacks. The
* peer stores the sequence number normally in a USIM and accepts
* incremental sequence numbers (incremental for lifetime of the USIM). To
* prevent a complex sequence number management, this implementation uses
* a sequence number derived from time. It is initialized to the startup
* time of the daemon. As long as the (UTC) time of the system is not
* turned back while the daemon is not running, this method is secure.
* To enable time based SEQs, define SEQ_CHECK as 1. Default is to accept
* any SEQ numbers. This allows an attacker to do replay attacks. But since
* the server has proven his identity via IKE, such an attack is only
* possible between server and AAA (if any).
*/
struct eap_aka_t {
/**
* Implemented eap_method_t interface.
*/
eap_method_t eap_method_interface;
};
/**
* Creates the server implementation of the EAP method EAP-AKA.
*
* @param server ID of the EAP server
* @param peer ID of the EAP client
* @return eap_aka_t object
*/
eap_aka_t *eap_aka_create_server(identification_t *server, identification_t *peer);
/**
* Creates the peer implementation of the EAP method EAP-AKA.
*
* @param server ID of the EAP server
* @param peer ID of the EAP client
* @return eap_aka_t object
*/
eap_aka_t *eap_aka_create_peer(identification_t *server, identification_t *peer);
#endif /** EAP_AKA_H_ @}*/
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