Towards First Class References As A Security Infrastructure In Dynamically Typed Languages
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Towards First Class References as a Security Infrastructure in Dynamically-typed Languages
Dynamically-typed object-oriented programming languages do not provide type information until runtime. Two of their main advantages are that they allow fast prototyping and integrating changes at runtime. The ability of dynamically-typed languages to support program changes at runtime and the lack of type information doom the classic security approaches to failure. Controlling references to single objects and to graphs of objects is essential to build secure systems. Existing approaches are commonly based on static type system and cannot be applied to dynamically-typed languages.This thesis argue that: In the context of dynamically-typed languages, reifying references, controlling behavior, and isolating state via such references, is a practical way to control references.This thesis makes five contributions: - We propose dynamic read-only objects (DRO) as one kind of adaptation of behavioral change at reference-level. - We generalize the DRO model to enable more generic behavioral changes. We extend the Pharo programming environment and language with Handles, that are first-class references with the ability to change the behavior of referenced objects. - We define Metahandle to offer flexibility and adaptability to controlled references. - We propose SHandle, an extension of the Handle model to isolate side effects at the level of references. - And finally, we formalize the Handles and SHandle models to represent and explain their semantics.As vlidation of our thesis we have implemented three approaches relevant to securing system using our model. In addition, as proof of concept we extended the Pharo virtual machine to support Handles, Metahandles and SHandles.
Programming Language Pragmatics
Programming Language Pragmatics, Third Edition, is the most comprehensive programming language book available today. Taking the perspective that language design and implementation are tightly interconnected and that neither can be fully understood in isolation, this critically acclaimed and bestselling book has been thoroughly updated to cover the most recent developments in programming language design, inclouding Java 6 and 7, C++0X, C# 3.0, F#, Fortran 2003 and 2008, Ada 2005, and Scheme R6RS. A new chapter on run-time program management covers virtual machines, managed code, just-in-time and dynamic compilation, reflection, binary translation and rewriting, mobile code, sandboxing, and debugging and program analysis tools. Over 800 numbered examples are provided to help the reader quickly cross-reference and access content. This text is designed for undergraduate Computer Science students, programmers, and systems and software engineers. - Classic programming foundations text now updated to familiarize students with the languages they are most likely to encounter in the workforce, including including Java 7, C++, C# 3.0, F#, Fortran 2008, Ada 2005, Scheme R6RS, and Perl 6. - New and expanded coverage of concurrency and run-time systems ensures students and professionals understand the most important advances driving software today. - Includes over 800 numbered examples to help the reader quickly cross-reference and access content.
Distributed Applications and Interoperable Systems
This book constitutes the refereed proceedings of the 7th IFIP WG 6.1 International Conference on Distributed Applications and Interoperable Systems, DAIS 2007, held in Paphos, Cyprus in June 2007. It covers current research in context-awareness, adaptation, mobility, distributed applications and peer-to-peer computing, all of which relate to the sustainability of distributed applications and integrated systems.