基于层次角色委托的服务网格授权执行模型

针对网格应用中对委托限制的多方面需求,提出了基于层次角色委托的服务网格授权执行模型.模型支持委托角色授予与撤销功能以及相应的关联性限制特性.通过加入信任度,细化了关联性限制的表达粒度.通过定义角色树作为委托授权的基本单位并对角色树进行剪枝,改善了部分委托实现的难度.通过定义带信任度的委托传播树,细化了对委托传播限制的控制.提出的委托凭证全面支持了角色委托的临时性、关联性、部分性、传播性限制需求.对模型中的委托授权执行规则作了形式化描述,并证明了执行规则能够细粒度地控制委托授权的执行过程.实例展示表明,模型能够满足网格应用对委托限制多方面的需求.

Hierarchical Role-Based Delegation Authorization Execution Model for Service Grid

To satisfy various requirements restricted delegation of in grid applications, a hierarchical role-based delegation authorization execution model for service grid is proposed. The dynamic characteristic of delegation role granting or revocation and the associated constraint of delegation role granting are effectively supported. The fine-grained associated role dependency is implemented by adding trustworthiness. Partial delegation problem is easily solved by defining the role tree as the basic unit of delegation authorization and by pruning the role tree. The delegation spread tree with trustworthiness is defined to implement multi-step delegation in a fine-grained manner. The delegation certification is proposed to fully express temporary delegation, associated role delegation, partial delegation, multi-step delegation. Based on above works, a set of formal delegation authorization execution rules is proposed and proved, and the delegation authorization execution process is effectively controlled. The exhibited example shows that the model can satisty various requirements of restricted delegation in grid applications.