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Towards a Certified Reference Monitor of the Android 10 Permission System

Authors Guido De Luca, Carlos Luna

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Guido De Luca
  • Universidad Nacional de Rosario, Argentina
Carlos Luna
  • InCo, Facultad de Ingeniería, Universidad de la República, Montevideo, Uruguay

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Guido De Luca and Carlos Luna. Towards a Certified Reference Monitor of the Android 10 Permission System. In 26th International Conference on Types for Proofs and Programs (TYPES 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 188, pp. 3:1-3:18, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021) https://doi.org/10.4230/LIPIcs.TYPES.2020.3

Abstract

Android is a platform for mobile devices that captures more than 85% of the total market share [International Data Corporation (IDC), 2020]. Currently, mobile devices allow people to develop multiple tasks in different areas. Regrettably, the benefits of using mobile devices are counteracted by increasing security risks. The important and critical role of these systems makes them a prime target for formal verification. In our previous work [Betarte et al., 2018], we exhibited a formal specification of an idealized formulation of the permission model of version 6 of Android. In this paper we present an enhanced version of the model in the proof assistant Coq, including the most relevant changes concerning the permission system introduced in versions Nougat, Oreo, Pie and 10. The properties that we had proved earlier for the security model have been either revalidated or refuted, and new ones have been formulated and proved. Additionally, we make observations on the security of the most recent versions of Android. Using the programming language of Coq we have developed a functional implementation of a reference validation mechanism and certified its correctness. The formal development is about 23k LOC of Coq, including proofs.

Subject Classification

ACM Subject Classification
  • Security and privacy → Systems security
  • Theory of computation → Proof theory
Keywords
  • Android
  • Permission model
  • Formal idealized model
  • Reference monitor
  • Formal proofs
  • Certified implementation
  • Coq

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References

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