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/*
* Copyright (C) 2013 Martin Willi
* Copyright (C) 2013 revosec AG
*
* 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 sasl sasl
* @ingroup pt_tls
*
* @defgroup sasl_mechanism sasl_mechanism
* @{ @ingroup sasl
*/
#ifndef SASL_MECHANISM_H_
#define SASL_MECHANISM_H_
typedef struct sasl_mechanism_t sasl_mechanism_t;
#include <library.h>
/**
* Constructor function for SASL mechansims.
*
* @param name name of the requested SASL mechanism
* @param client client identity, NULL to act as server
* @return SASL mechanism, NULL on failure
*/
typedef sasl_mechanism_t*(*sasl_mechanism_constructor_t)(char *name,
identification_t *client);
/**
* Generic interface for SASL mechanisms.
*/
struct sasl_mechanism_t {
/**
* Get the name of this SASL mechanism.
*
* @return name of SASL mechanism
*/
char* (*get_name)(sasl_mechanism_t *this);
/**
* Build a SASL message to send to remote host.
*
* A message is returned if the return value is NEED_MORE or SUCCESS. A
* client MUST NOT return SUCCESS in build(), as the final message
* is always from server to client (even if it is an empty result message).
*
* @param message receives allocated SASL message, to free
* @return
* - FAILED if mechanism failed
* - NEED_MORE if additional exchanges required
* - INVALID_STATE if currently nothing to build
* - SUCCESS if mechanism authenticated successfully
*/
status_t (*build)(sasl_mechanism_t *this, chunk_t *message);
/**
* Process a SASL message received from remote host.
*
* If a server returns SUCCESS during process(), an empty result message
* is sent to complete the SASL exchange.
*
* @param message received SASL message to process
* @return
* - FAILED if mechanism failed
* - NEED_MORE if additional exchanges required
* - SUCCESS if mechanism authenticated successfully
*/
status_t (*process)(sasl_mechanism_t *this, chunk_t message);
/**
* Destroy a sasl_mechanism_t.
*/
void (*destroy)(sasl_mechanism_t *this);
};
/**
* Create a sasl_mechanism instance.
*
* @param name name of SASL mechanism to create
* @param client client identity, NULL to act as server
* @return SASL mechanism instance, NULL if not found
*/
sasl_mechanism_t *sasl_mechanism_create(char *name, identification_t *client);
/**
* Create an enumerator over supported SASL mechanism names.
*
* @param server TRUE for server instance, FALSE for client
* @return enumerator over char*
*/
enumerator_t* sasl_mechanism_create_enumerator(bool server);
#endif /** SASL_MECHANISM_H_ @}*/
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