Vol.53 No (Feb. 2012) IaaS 1 1 1, , IaaS VM VM VM VM VM VM IaaS VM IaaS FBCrypt FBCrypt VNC VMM VM VM FBCrypt Xen TightVNC S

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1 IaaS 1 1 1, , IaaS VM VM VM VM VM VM IaaS VM IaaS FBCrypt FBCrypt VNC VMM VM VM FBCrypt Xen TightVNC Secure Out-of-band Remote Management in IaaS Clouds Tomohisa Egawa 1 Naoki Nishimura 1 Kenichi Kourai 1,2 Received: November 4, 2011, Accepted: December 1, 2011 Abstract: In Infrastructure-as-a-Service (IaaS) clouds, the users remotely manage the systems in the provided virtual machines (VMs) called user VMs. Out-of-band remote management via the management VM allows the users to manage their systems even on failures inside the user VMs. However, the management VM is not always trustworthy in IaaS clouds. Outside or inside attackers in the management VM can easily eavesdrop on the keyboard inputs and video outputs in out-of-band remote management. To solve this security issue, this paper proposes FBCrypt for enabling secure out-of-band remote management. FBCrypt encrypts the inputs and outputs in a VNC client and the virtual machine monitor to prevent information leakage via the management VM. We have implemented FBCrypt in Xen and TightVNC and confirmed that the keyboard inputs and video outputs did not leak. Keywords: Virtual machine, remote management, information leakage 1. Infrastructure as a Service IaaS VM VM VNC VM VM 1 Kyushu Institute of Technology 2 CREST OS VM VM VM VM VM IaaS VM [1], [2] VM [3] VM c 2012 Information Processing Society of Japan 1

2 VNC VM IaaS FBCrypt FBCrypt VNC VMM VM VM VM VNC VMM VM VMM VNC FBCrypt VM VM FBCrypt Xen [4] TightVNC [5] VMM VM I/O IN VMM VMM VFB VM VFB FBCrypt VM 2 IaaS 3 FBCrypt 4 5 FBCrypt VM IaaS VM VNC VM VNC VNC VNC VM VNC VNC VM VM VNC VM OS OS VNC 1 VM VM 1 VM VM VM VM VM VM VNC VM VM VM VM VM VM OS Xen KVM VMware vsphere Hypervisor IaaS [6] IaaS VM IaaS VM [1], [2] IaaS VM VM VM VM IaaS VM VM VNC VNC VPN SSH VM VM c 2012 Information Processing Society of Japan 2

3 VM VNC VM VNC VM VM VM VNC VNC VNC VM VM VM VM 3. FBCrypt IaaS FBCrypt 3.1 FBCrypt IaaS VM VM OS VNC VM VNC VM FBCrypt IaaS [7] VMM VM VM VMM VM VM VM PC VNC 2 FBCrypt 3.2 FBCrypt FBCrypt VNC VMM VM VM VM FBCrypt VM VNC VM VMM VNC VM VNC. VNC VM VM VM VMM VM VM OS VMM VNC VM VNC VM VNC MAC VMM VM VM VM c 2012 Information Processing Society of Japan 3

4 VMM VNC VM VM VMM VM VNC VNC VNC VM VNC VNC VM OS OS VMM FBCrypt IaaS IaaS VMM TPM [8] FBCrypt TPM VMM VMM VMM IaaS IaaS FBCrypt Xen 1 VMM VMM VM Xen VM 0 VM VMM VMM KVM 2VMM VM OS VMM VMM FBCrypt VNC VNC VMM VM VMM VMM IaaS VMM VNC VMM VM VM VMM VMM VNC VMM VMM TPM VMM VM VMM 4. FBCrypt Xen [4] TightVNC Java Viewer [5] Xen VM 0 VM U VM IO QEMU VNC VM OS Linux Linux VNC 0 VNC VNC U VNC VMM VMM U I/O I/O VNC U I/O FBCrypt VMM I/O U kbdfront I/O 4 VNC U IN VMM 0 U VMM c 2012 Information Processing Society of Japan 4

5 FBCrypt VMM VNC VNC VMM MAC VNC MAC VMM VMM U OS VMM ASCII U VNC ASCII FBCrypt ASCII VMM I/O FBCrypt VMM U IO U I/O xenkbd 0 XenStore XenStore VMM U 0 xenkbd XenStore U I/O FBCrypt 0 U I/O 0 0 XenStore I/O xenkbd FBCrypt VMM 0 xenkbd 0 U VMM 0 XenStore xenkbd AES CTR [9] FBCrypt CyaSSL [10] VMM VNC TightVNC Java Viewer [5] Java API VNC 2 VNC 2 Enter Delete U fbfront VFB 0 VNC VFB U VFB 0 VFB c 2012 Information Processing Society of Japan 5

6 5 6 XenStore VFB FBCrypt VMM U VFB Linux U VFB 0 U VFB VFB xenfb U VFB 0 xenfb 0 XenStore VMM VFB VMM U VFB 0 0 U VFB VFB FBCrypt 0 VFB 2 VFB U VFB I/O 0 I/O xenfb VMM VFB 0 VFB 0 VNC VNC VNC VNC VFB FBCrypt I/O 0 U VFB U VFB 0 U VFB VMM I/O I/O I/O VFB RC5 [11] RC5 Xen VFB 1 32 FBCrypt RC5 x y VFB 2 Xen VNC VNC VNC XenStore U XenStore VMM FBCrypt VMM 0 U XenStore XenStore I/O U XenStore 16 XenStore XenStore device/vkbd/0/page-ref xenkbd c 2012 Information Processing Society of Japan 6

7 device/vfb/0/page-ref xenfb FBCrypt VMM U XenStore 0 XenStore FBCrypt VMM XenStore U XenStore XenStore U 0 U VMM U CPU XenStore FBCrypt VMM U CPU RSI U VMM U U P2M P2M U VMM U P2M P2M VMM M2P U VMM XenStore XenStore VMM XenStore 0 5. FBCrypt FBCrypt VNC Intel Core 2 Quad Q GHz CPU VNC VM VM VMM 7 VM 8 9 ( ) ( ) FBCrypt Xen VM VM Linux GB 0 3GB U 512MB VNC FBCrypt TightVNC Java Viewer Linux VM VNC VM VNC FBCrypt VNC 7 FBCrypt VNC 8 VM VNC VM VFB FBCrypt VM FBCrypt VM c 2012 Information Processing Society of Japan 7

8 10 13 (a) (b) FBCrypt 11 FBCrypt VM 800x600 FBCrypt VM VNC 13 FBCrypt 46ms 46ms 6. (a) (b) FBCrypt VNC FBCrypt VNC PV FBCrypt 5.1ms FV FBCrypt 4.2ms FBCrypt Xoar [12] VNC QEMU QemuVM VM Xen QEMU VM VM OS mini-os VM VNC IaaS VMware vsphere Hypervisor ESXi) [13] VMM VNC VMM VM VM VNC VMM FBCrypt VNC [2] VMCrypt [14] VM VM VM VM VMM VM I/O VFB c 2012 Information Processing Society of Japan 8

9 VM FBCrypt VM FBCrypt VM VM CloudVisor [7] VMM VM CloudVisor VM VMM VM VM VMM BitVisor [15] OS VMM OS I/O VMM USB PC BitVisor VM VMM VMM BitVisor Xen VNC Proxy [16] VM VM xvp Web VM VM VM xvp VNC 7. IaaS FBCrypt FBCrypt VNC VMM VM VM FBCrypt Xen TightVNC Java Viewer OS Windows Linux OS VFB AES 179 (2010). [3] TechSpot News: Google Fired Employees for Breaching User Privacy, google-fired-employees-for-breaching-user-privacy. html (2010). [4] P.Barham, B.Dragovic, K.Fraser, S.Hand, T.Harris, A.Ho, R.Neugebauer, I.Pratt and A.Warfield: Xen and the Art of Virtualization, In Proc. of the 19th Symposium on Operating Systems Principles, pp (2003). [5] TightVNC Group: TightVNC, com/. [6] rackspace: rackspace, [7] Zhang, F., Chen, J., Chen, H. and Zang, B.: CloudVisor: Retrofitting Protection of Virtual Machines in Multitenant Cloud with Nested Virtualization, Proc. Symp. Operating Systems Principles, pp (2011). [8] Trusted Computing Group: TPM Main Specification, (2011). [9] NIST: Advanced Encryption Standard (AES)., FIPS Publication 197 (2001). [10] yassl: yassl - Embedded SSL Library for Applications,Devices,and the Cloud, yassl/home.html. [11] Rivest, R. L.: The RC5 Encryption Algorithm, Proc. Workshop Fast Software Encryption (1994). [12] Colp, P., Nanavati, M., Zhu, J., Aiello, W., Coker, G., Deegan, T., Loscocco, P. and Warfield, A.: Breaking Up is Hard to Do: Security and Functionality in a Commodity Hypervisor, Proc. Symp. Operating Systems Principles, pp (2011). [13] VMware Inc.: VMware vsphere Hypervisor, [14] Preventing Information Leakage from Virtual Machine s Memory in IaaS Clouds, Advanced Computing Systems ACS Vol 5 No.4) (2012). [15] Shinagawa, T., Eiraku, H., Tanimoto, K., Omote, K., Hasegawa, S., Horie, T., Hirano, M., Kourai, K., Oyama, Y., Kawai, E., Kono, K., Chiba, S., Shinjo, Y. and Kato, K.: BitVisor, Proc. Intl. Conf. Virtual Execution Environments and VEE 09, pp (2009). [16] xvp Project: Xen VNC Proxy Cross-platform VNCbased and Web-based Management for Citrix XenServer and Xen Cloud Platform 2012/6/28. [1] Santos, N., Gummadi, K. P. and Rodrigues, R.: Towards Trusted Cloud Computing, Proc. Workshop Hot Topics in Cloud Computing (2009). [2] Li, C., Raghunathan, A. and Jha, N. K.: Secure Virtual Machine Execution under an Untrusted Management OS, Proc. Intl. Conf. Cloud Computing, pp. 172 c 2012 Information Processing Society of Japan 9

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