Hybrid Mandatory Integrity Model Composed of Biba and Clark-Wilson Policy

Abstract

商业应用需要实施完整性策略保护.Biba模型提供了一种简洁的多级完整性控制方案,但是需要引入可信主体来保证实施的可用性.而Clark-Wilson模型通过可监控的状态转换提供了一种完备的完整性保护,但其复杂性影响了该模型的完整实现.提出的模型以Biba严格完整性策略为基础,同时根据可信主体在其生命周期所属的状态实施Biba低水标策略.对可信主体在其生命周期发生的状态转换及相应的低水标参数调整,采用Clark-Wilson模型来进行监控.在有效解决了Biba策略的可用性问题和Clark-Wilson模型监控量过大给系统带来的配置和运行负担问题的同时,继承它们的优点.证明了该策略融合方案是可行的、安全的.;Commercial application requires protection of integrity policy. Biba model provides a simple multi-level integrity access control scheme but it needs the introduction of trusted subject to ensure the usability. Clark-Wilson model provides a complete integrity protection by means of controlled state transaction, but its entire implementation is hindered by its complication. This paper proposes a model that enforces Biba strict integrity policy as basic access control mechanism, at the same time enforces Biba low-water-mark policy on trusted subjects according to the state in their lifecycle. Clark-Wilson model is used to control and audit subject’s state transition and run time adjustment of low-water-mark policy parameters. This paper solves the usability problem introduced by Biba policies and high configuration burden and runtime overload introduced by massive supervising task of Clark-Wilson, while at the same time borrows their merits. This policy composition scheme is proved to be applicable and secure.