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Object-Oriented Authorization

  • H. H. Brüggemann
Part of the International Centre for Mechanical Sciences book series (CISM, volume 347)

Abstract

In this paper we introduce an intuitive approach to the semantics of an authorization system based on a clear object-oriented modeling of the (application) world. The authorization system consists of rights which permit or prohibit actions. Actions consist of subjects, operations (access types), and granules (objects to protect) specifying who does which operation on whom. Each of these constituents of actions may be grouped into classes. Moreover, for each of these constituents we have a separate class hierarchy. A right can be given for either one object or for all objects of a class. All rights (permissions and prohibitions) must be specified explicitly. This allows the easy specification of general rules and of exceptions to such a rule. For distinguishing between a general rule and the exception we use priorities, which allow exceptions on an arbitrary level. Moreover, we can use priorities for resolving rights conflicts. We distinguish between specified rights which may contain class names and explicit rights in which only objects are allowed and in which the priority is dropped because of it is understood that only the right with the highest priority for one action is mentioned. Since the number of explicit rights is drastically larger than the number of specified rights we need and give efficient strategies to query the authorization system. In our approach we assume that there are one or more authorization administrators for setting and changing the rights. For reducing unintended side effects if several administrators can independently modify the rights we propose partially ordered priorities.

Keywords

Class Hierarchy Local Priority Database Security Simple Query Actual Conflict 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Wien 1994

Authors and Affiliations

  • H. H. Brüggemann
    • 1
  1. 1.University of HildesheimHildesheimGermany

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