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/* Copyright (C) 2002-2003 RealVNC Ltd. All Rights Reserved.
*
* This 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.
*
* This software 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.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
//
// SSecurity - class on the server side for handling security handshaking. A
// derived class for a particular security type overrides the processMsg()
// method. processMsg() is called first when the security type has been
// decided on, and will keep being called whenever there is data to read from
// the client until either it returns false, indicating authentication/security
// failure, or it returns with done set to true, to indicate success.
//
// processMsg() must never block (or at least must never block until the client
// has been authenticated) - this is to prevent denial of service attacks.
// Note that the first time processMsg() is called, there is no guarantee that
// there is any data to read from the SConnection's InStream, but subsequent
// calls guarantee there is at least one byte which can be read without
// blocking.
//
// getType() should return the secType value corresponding to the SSecurity
// implementation.
//
// failureMessage_.buf can be set to a string which will be passed to the client
// if processMsg returns false, to indicate the reason for the failure.
#ifndef __RFB_SSECURITY_H__
#define __RFB_SSECURITY_H__
#include <rfb/util.h>
namespace rfb {
class SConnection;
class SSecurity {
public:
virtual ~SSecurity() {}
virtual bool processMsg(SConnection* sc, bool* done)=0;
virtual void destroy() { delete this; }
virtual int getType() const = 0;
// getUserName() gets the name of the user attempting authentication. The
// storage is owned by the SSecurity object, so a copy must be taken if
// necessary. Null may be returned to indicate that there is no user name
// for this security type.
virtual const char* getUserName() const = 0;
virtual const char* failureMessage() {return failureMessage_.buf;}
protected:
CharArray failureMessage_;
};
// SSecurityFactory creates new SSecurity instances for
// particular security types.
// The instances must be destroyed by calling destroy()
// on them when done.
class SSecurityFactory {
public:
virtual ~SSecurityFactory() {}
virtual SSecurity* getSSecurity(int secType, bool noAuth=false)=0;
};
}
#endif
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