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Driftor: mitigating cloud-based side-channel attacks by switching and migrating multi-executor virtual machines
- 基于切换和迁移多执行体架构虚拟机的云侧信道攻击防御技术
- Frontiers of Information Technology & Electronic Engineering Vol. 20, Issue 5, Pages: 731-748(2019)
- Affiliations：
National Digital Switching System Engineering & Technological Research Center, Zhengzhou 450003, China
- Author bio：
[ "Chao YANG, E-mail: 1989600235@qq.com" ]
- Funds：
DOI：10.1631/FITEE.1800526
CLC： TP393Received：31 August 2018，
Revised：2019-;5-13，
Published：2019-05
- Accepted：
Scan QR Code
Chao YANG, Yun-fei GUO, Hong-chao HU, et al. Driftor: mitigating cloud-based side-channel attacks by switching and migrating multi-executor virtual machines[J]. Frontiers of Information Technology & Electronic Engineering, 2019, 20(5): 731-748.
Chao YANG, Yun-fei GUO, Hong-chao HU, et al. Driftor: mitigating cloud-based side-channel attacks by switching and migrating multi-executor virtual machines[J]. Frontiers of Information Technology & Electronic Engineering, 2019, 20(5): 731-748. DOI： 10.1631/FITEE.1800526.
摘要
云中不同租户的虚拟机共存为以信息泄露为目标的侧信道攻击创造了便利条件。然而，当前绝大多数防御技术都存在通用性或兼容性问题，无法在真实环境下实现快速部署。作为云系统固有功能之一，虚拟机迁移机制可通过在服务器之间迁移虚拟机，限制租户共存，从而提供一种具有应用前景的防御思路。本文首先建立一个统一的攻击模型，攻击者关注的目标是有效侧信道攻击。设计了一种包含多执行架构虚拟机的新型云系统：Driftor。对于其中每个虚拟机，同一时刻有且仅有一个执行体处于运行状态，并通过代理提供服务，以此降低可能泄漏的信息量。为模拟虚拟机迁移机制，系统将在虚拟机不同执行体之前周期性切换运行状态，同时通过真实迁移操作加强防御效果。为解决CIRCUIT-SAT求解迁移问题时的弱扩展性，本文提出一种类贪婪算法，通过逐渐扩展必须迁移的虚拟机子集搜索可行解。实验结果表明，Driftor能有效防御快速侧信道攻击，且针对真实云应用的防御开销较小。
Abstract
Co-residency of different tenants' virtual machines (VMs) in cloud provides a good chance for side-channel attacks
which results in information leakage. However
most of current defense suffers from the generality or compatibility problem
thus failing in immediate real-world deployment. VM migration
an inherit mechanism of cloud systems
envisions a promising countermeasure
which limits co-residency by moving VMs between servers. Therefore
we first set up a unified practical adversary model
where the attacker focuses on effective side channels. Then we propose Driftor
a new cloud system that contains VMs of a multi-executor structure where only one executor is active to provide service through a proxy
thus reducing possible information leakage. Active state is periodically switched between executors to simulate defensive effect of VM migration. To enhance the defense
real VM migration is enabled at the same time. Instead of solving the migration satisfiability problem with intractable CIRCUIT-SAT
a greedy-like heuristic algorithm is proposed to search for a viable solution by gradually expanding an initial has-to-migrate set of VMs. Experimental results show that Driftor can not only defend against practical fast side-channel attack
but also bring about reasonable impacts on real-world cloud applications.
关键词
Keywords
references
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