Regrading Policies for Flexible Information Flow Control in Session-Typed Concurrency

Farzaneh Derakhshan, Stephanie Balzer, Yue Yao
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Abstract

Noninterference guarantees that an attacker cannot infer secrets by interacting with a program. Information flow control (IFC) type systems assert noninterference by tracking the level of information learned (pc) and disallowing communication to entities of lesser or unrelated level than the pc. Control flow constructs such as loops are at odds with this pattern because they necessitate downgrading the pc upon recursion to be practical. In a concurrent setting, however, downgrading is not generally safe. This paper utilizes session types to track the flow of information and contributes an IFC type system for message-passing concurrent processes that allows downgrading the pc upon recursion. To make downgrading safe, the paper introduces regrading policies. Regrading policies are expressed in terms of integrity labels, which are also key to safe composition of entities with different regrading policies. The paper develops the type system and proves progress-sensitive noninterference for well-typed processes, ruling out timing attacks that exploit the relative order of messages. The type system has been implemented in a type checker, which supports security-polymorphic processes using local security theories.
会话类型并发中灵活信息流控制的重整策略
不干涉保证了攻击者无法通过与程序的交互推断出秘密。信息流控制(IFC)类型的系统通过跟踪所获知信息(pc)的级别,并禁止与级别低于pc或与pc无关的实体通信,来保证无干扰。控制流结构(如循环)与这种模式相悖,因为它们必须在递归时降低pc的级别,才能实用。然而,在当前的环境中,降级通常并不安全。本文利用会话类型来跟踪信息流,并为消息传递并发进程贡献了一个 IFC 类型系统,它允许在递归时降级 pc。为了使降级安全,本文引入了降级策略。重新分级策略用完整性标签来表示,这也是具有不同重新分级策略的实体安全组合的关键。论文开发了类型系统,并证明了对于类型良好的进程,进度对干扰的敏感性,排除了利用消息相对顺序的定时攻击。该类型系统已在类型检查器中实现,它支持使用本地安全理论的安全多态进程。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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