NDLI: Leveraging "choice" to automate authorization hook placement

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Leveraging "choice" to automate authorization hook placement

Content Provider	ACM Digital Library
Author	Jaeger, Trent Muthukumaran, Divya Ganapathy, Vinod
Abstract	When servers manage resources on behalf of multiple, mutually-distrusting clients, they must mediate access to those resources to ensure that each client request complies with an authorization policy. This goal is typically achieved by placing authorization hooks at appropriate locations in server code. The goal of authorization hook placement is to completely mediate all security-sensitive operations on shared resources. To date, authorization hook placement in code bases, such as the X server and postgresql, has largely been a manual procedure, driven by informal analysis of server code and discussions on developer forums. Often, there is a lack of consensus about basic concepts, such as whatconstitutes a security-sensitive operation. In this paper, we propose an automated hook placement approach that is motivated by a novel observation --- that the deliberate choices made by clients for objects from server collections and for processing those objects must all be authorized. We have built a tool that uses this observation to statically analyze the server source. Using real-world examples (the X server and postgresql), we show that the hooks placed by our method are just as effective as hooks that were manually placed over the course of years while greatly reducing the burden on programmers.
Starting Page	145
Ending Page	156
Page Count	12
File Format	PDF
ISBN	9781450316514
DOI	10.1145/2382196.2382215
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2012-10-16
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Static taint analysis Authorization hooks
Content Type	Text
Resource Type	Article

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