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/* Copyright (C) 2002-2005 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. It should return false when it needs more data, or true
// when the connection has been successfully authenticated. In the
// event of authentication failure an auth_error should be thrown - this
// will result in a "failed" security result being sent to the client
// with the str() from the exception being sent as the reason. Any
// other type of failure should be indicated by some other kind of
// exception which will cause the connection to be aborted.
//
// 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.
//
#ifndef __RFB_SSECURITY_H__
#define __RFB_SSECURITY_H__
#include <rfb/SConnection.h>
#include <list>
namespace rfb {
class SSecurity {
public:
SSecurity(SConnection* sc_) : sc(sc_) {}
virtual ~SSecurity() {}
virtual bool processMsg() = 0;
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 AccessRights getAccessRights() const { return AccessDefault; }
protected:
SConnection* sc;
};
}
#endif
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