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Published on Nov 11, 2016
The Principle of Least Privilege says that software shouldn’t be executed with more authority than it needs to get its job done. Shill is a shell scripting language designed to make it easy to follow the Principle of Least Privilege—every Shill script comes with a contract (built with Racket’s contract library) that describes exactly what it can do. By combining careful language design with system-level sandboxing, Shill’s security guarantees let users run third-party scripts with confidence. This talk gives an overview of Shill and describes how Racket streamlined its design and implementation.