Secure the Clones

TL;DR

This paper introduces a type-based annotation system for secure, modular object cloning in Java, ensuring deep copies and preventing malicious subclassing through static enforcement and formal proof.

Contribution

It proposes a novel static enforcement mechanism for copy policies in Java, supported by a formal proof of correctness in Coq, enhancing security in object cloning.

Findings

Effective static enforcement of copy policies

Formal proof of correctness in Coq

Successful implementation on Java libraries

Abstract

Exchanging mutable data objects with untrusted code is a delicate matter because of the risk of creating a data space that is accessible by an attacker. Consequently, secure programming guidelines for Java stress the importance of using defensive copying before accepting or handing out references to an internal mutable object. However, implementation of a copy method (like clone()) is entirely left to the programmer. It may not provide a sufficiently deep copy of an object and is subject to overriding by a malicious sub-class. Currently no language-based mechanism supports secure object cloning. This paper proposes a type-based annotation system for defining modular copy policies for class-based object-oriented programs. A copy policy specifies the maximally allowed sharing between an object and its clone. We present a static enforcement mechanism that will guarantee that all classes fulfil their copy policy, even in the presence of overriding of copy methods, and establish the semantic correctness of the overall approach in Coq. The mechanism has been implemented and experimentally evaluated on clone methods from several Java libraries.