HVSM: An In-Out-VM security monitoring architecture in IAAS cloud

As a basic cloud service model, the Infrastructure-as-aService (IaaS) provides fundamental computing resources for PaaS and SaaS with a guaranteed ability to reduce costs and improve resource efficiency. Virtualization plays a crucial role to support the IaaS. However, it is not safety because of exposing the hosted virtual machines (VMs) to uncontrollable environment. In addition, traditional in-guest security solutions, relying on operation system kernel trustworthiness, are no longer effective to virtual infrastructure. In this paper, we introduce HVSM (Hybrid Virtualization Security Monitor) to deal with above security problems, which is a new In-OutVM hybrid virtualization-aware architecture depending on lightweight, comprehensive and dynamic security monitoring. First, as to Hybrid, HVSM utilizes virtual machine introspection technique to inspect kernel running state of the guest VM (GVM) from outside. Inside the GVM, measure agent (MA) tests and delivers processes´ integrity information to security VM (SVM). In succession, MA is in the guard of measure agent keeper (MAK) running in the SVM. Second, dynamically, HVSM combines kernel state information with processes´ integrity so as to provide a security report on GVM. Third, a proof-of-concept prototype is implemented using libvmi based on Xen hypervisor. Finally, we evaluate efficiency and the performance overhead of HVSM, which is acceptably low to support real-time monitoring.