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Toward an On-Demand Restricted Delegation Mechanism for Grids

Ahsant, M., Basney, J., Mulmo, O., Lee, A. J., Johnsson, L.
Citation:

IEEE/ACM International Conference on Grid Computing (Grid 2006),  pp.152,159, 28-29 Sept. 2006.

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Abstract:

Grids are intended to enable cross-organizational interactions which makes grid security a challenging and non-trivial issue. In grids, delegation is a key facility that can be used to authenticate and authorize requests on behalf of disconnected users. In current grid systems there is a tradeoff between flexibility and security in the context of delegation. Applications must choose between limited or full delegation: on one hand, delegating a restricted set of rights reduces exposure to attack but also limits the flexibility/dynamism of the application; on the other hand, delegating all rights provides maximum flexibility but increases exposure. In this paper, we propose an on-demand restricted delegation mechanism, aimed at addressing the shortcomings of current delegation mechanisms by providing restricted delegation in a flexible fashion as needed for grid applications. This mechanism provides an ontology-based solution for tackling one the most challenging issues in security systems, which is the principle of least privileges. It utilizes a callback mechanism, which allows on-demand provisioning of delegated credentials in addition to observing, screening, and auditing delegated rights at runtime. This mechanism provides support for generating delegation credentials with a very limited and well-defined range of capabilities or policies, where a delegator is able to grant a delegatee a set of restricted and limited rights, implicitly or explicitly.

Publication Status:
Published
Publication Type:
Proceedings
Publication Date:
09/28/2006
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