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Modern web application frameworks have made it easy to create powerful web applications. Developing a secure web application, however, still requires a developer to posses a deep understanding of security vulnerabilities and attacks. Even for experienced developers it is tedious, if not impossible, to find and eliminate all vulnerabilities. This paper presents GuardRails, a source-to-source tool for Ruby on Rails that helps developers build secure web applications. GuardRails works by attaching security policies defined using annotations to the data model itself. GuardRails produces a version of the input application that automatically enforces the specified policies. GuardRails helps developers prevent a myriad of security problems including cross-site scripting attacks and access control violations while providing a large degree of flexibility to support a range of policies and development styles.
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