Secure Distributed Programming with Value-Dependent Types

Résumé : Distributed applications are difficult to program reliably and securely. Dependently typed functional languages promise to prevent broad classes of errors and vulnerabilities, and to enable program ver- ification to proceed side-by-side with development. However, as recursion, effects, and rich libraries are added, using types to reason about programs, specifications, and proofs becomes challenging. We present F⋆, a full-fledged design and implementation of a new dependently typed language for secure distributed programming. Our language provides arbitrary recursion while maintaining a logically consistent core; it enables modular reasoning about state and other effects using affine types; and it supports proofs of refinement properties using a mixture of cryptographic evidence and logical proof terms. The key mechanism is a new kind system that tracks several sub-languages within F⋆ and controls their interaction. F⋆ subsumes two previous languages, F7 and Fine. We prove type soundness (with proofs mechanized in Coq) and logical consistency for F⋆. We have implemented a compiler that translates F⋆ to .NET bytecode, based on a prototype for Fine. F⋆ provides access to libraries for concurrency, networking, cryptography, and interoperability with C#, F#, and the other .NET languages. The compiler produces verifiable binaries with 60% code size overhead for proofs and types, as much as a 45x improvement over the Fine compiler, while still enabling efficient bytecode verification. We have programmed and verified nearly 50,000 lines of F⋆ including new schemes for multi- party sessions; a zero-knowledge privacy-preserving payment protocol; a provenance-aware curated database; a suite of web-browser extensions verified for authorization properties; a cloud-hosted multi-tier web application with a verified reference monitor; the core F⋆ typechecker itself; and programs translated to F⋆ from other languages such as F7 and JavaScript.
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J. Funct. Program., Cambridge University Press, 2013, 23 (4), pp.402-451
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Nikhil Swamy, Juan Chen, Cédric Fournet, Pierre-Yves Strub, Karthikeyan Bhargavan, et al.. Secure Distributed Programming with Value-Dependent Types. J. Funct. Program., Cambridge University Press, 2013, 23 (4), pp.402-451. 〈hal-00939188〉

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