Ensuring authorization privileges for cascading user obligations

Omar Chowdhury, Murillo Pontual, William H. Winsborough, Ting Yu, Keith Irwin, Jianwei Niu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

User obligations are actions that the human users are required to perform in some future time. These are common in many practical access control and privacy and can depend on and affect the authorization state. Consequently, a user can incur an obligation that she is not authorized to perform which may hamper the usability of a system. To mitigate this problem, previous work introduced a property of the authorization state, accountability, which requires that all the obligatory actions to be authorized when they are attempted. Although, existing work provides a specific and tractable decision procedure for a variation of the accountability property, it makes a simplified assumption that no cascading obligations may happen, i.e., obligatory actions cannot further incur obligations. This is a strong assumption which reduces the expressive power of past models, and thus cannot support many obligation scenarios in practical security and privacy policies. In this work, we precisely specify the strong accountability property in the presence of cascading obligations and prove that deciding it is NP-hard. We provide for several special yet practical cases of cascading obligations (i.e., repetitive, finite cascading, etc.) a tractable decision procedure for accountability. Our experimental results illustrate that supporting such special cases is feasible in practice.

Original languageEnglish
Title of host publicationSACMAT'12 - Proceedings of the 17th ACM Symposium on Access Control Models and Technologies
Pages33-43
Number of pages11
DOIs
Publication statusPublished - 25 Jul 2012
Event17th ACM Symposium on Access Control Models and Technologies, SACMAT'12 - Newark, NJ, United States
Duration: 20 Jun 201222 Jun 2012

Publication series

NameProceedings of ACM Symposium on Access Control Models and Technologies, SACMAT

Other

Other17th ACM Symposium on Access Control Models and Technologies, SACMAT'12
CountryUnited States
CityNewark, NJ
Period20/6/1222/6/12

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Keywords

  • Accountability
  • Authorization
  • Cascading obligations
  • Obligations
  • RBAC

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Safety, Risk, Reliability and Quality
  • Information Systems

Cite this

Chowdhury, O., Pontual, M., Winsborough, W. H., Yu, T., Irwin, K., & Niu, J. (2012). Ensuring authorization privileges for cascading user obligations. In SACMAT'12 - Proceedings of the 17th ACM Symposium on Access Control Models and Technologies (pp. 33-43). (Proceedings of ACM Symposium on Access Control Models and Technologies, SACMAT). https://doi.org/10.1145/2295136.2295144