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/*
* Copyright (C) 2008-2011 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 simaka_provider simaka_provider
* @{ @ingroup libsimaka
*/
#ifndef SIMAKA_PROVIDER_H_
#define SIMAKA_PROVIDER_H_
typedef struct simaka_provider_t simaka_provider_t;
#include "simaka_manager.h"
#include <utils/identification.h>
/**
* Interface for a triplet/quintuplet provider (used as EAP server).
*
* A SIM provider hands out triplets for SIM authentication and quintuplets
* for AKA authentication. Multiple SIM provider instances can serve as
* authentication backend to authenticate clients using SIM/AKA.
* An implementation supporting only one of SIM/AKA authentication may
* implement the other methods with return_false().
*/
struct simaka_provider_t {
/**
* Create a challenge for SIM authentication.
*
* @param id permanent identity of peer to gen triplet for
* @param rand RAND output buffer, fixed size 16 bytes
* @param sres SRES output buffer, fixed size 4 byte
* @param kc KC output buffer, fixed size 8 bytes
* @return TRUE if triplet received, FALSE otherwise
*/
bool (*get_triplet)(simaka_provider_t *this, identification_t *id,
char rand[SIM_RAND_LEN], char sres[SIM_SRES_LEN],
char kc[SIM_KC_LEN]);
/**
* Create a challenge for AKA authentication.
*
* The XRES value is the only one with variable length. Pass a buffer
* of at least AKA_RES_MAX, the actual number of bytes is written to the
* xres_len value. While the standard would allow any bit length between
* 32 and 128 bits, we support only full bytes for now.
*
* @param id permanent identity of peer to create challenge for
* @param rand buffer receiving random value rand
* @param xres buffer receiving expected authentication result xres
* @param xres_len nubmer of bytes written to xres buffer
* @param ck buffer receiving encryption key ck
* @param ik buffer receiving integrity key ik
* @param autn authentication token autn
* @return TRUE if quintuplet generated successfully
*/
bool (*get_quintuplet)(simaka_provider_t *this, identification_t *id,
char rand[AKA_RAND_LEN],
char xres[AKA_RES_MAX], int *xres_len,
char ck[AKA_CK_LEN], char ik[AKA_IK_LEN],
char autn[AKA_AUTN_LEN]);
/**
* Process AKA resynchroniusation request of a peer.
*
* @param id permanent identity of peer requesting resynchronisation
* @param rand random value rand
* @param auts synchronization parameter auts
* @return TRUE if resynchronized successfully
*/
bool (*resync)(simaka_provider_t *this, identification_t *id,
char rand[AKA_RAND_LEN], char auts[AKA_AUTS_LEN]);
/**
* Check if peer uses a pseudonym, get permanent identity.
*
* @param id pseudonym identity candidate
* @return permanent identity, NULL if id not a pseudonym
*/
identification_t* (*is_pseudonym)(simaka_provider_t *this,
identification_t *id);
/**
* Generate a pseudonym identitiy for a given peer identity.
*
* @param id permanent identity to generate a pseudonym for
* @return generated pseudonym, NULL to not use a pseudonym identity
*/
identification_t* (*gen_pseudonym)(simaka_provider_t *this,
identification_t *id);
/**
* Check if peer uses reauthentication, retrieve reauth parameters.
*
* @param id reauthentication identity (candidate)
* @param mk buffer receiving master key MK
* @param counter pointer receiving current counter value, host order
* @return permanent identity, NULL if id not a reauth identity
*/
identification_t* (*is_reauth)(simaka_provider_t *this, identification_t *id,
char mk[HASH_SIZE_SHA1], u_int16_t *counter);
/**
* Generate a fast reauthentication identity, associated to a master key.
*
* @param id permanent peer identity
* @param mk master key to store along with generated identity
* @return fast reauthentication identity, NULL to not use reauth
*/
identification_t* (*gen_reauth)(simaka_provider_t *this, identification_t *id,
char mk[HASH_SIZE_SHA1]);
};
#endif /** SIMAKA_CARD_H_ @}*/
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