A Compositional Multiple Policies Operating System Security Model

摘要

Multilevel security policies aim at only confidentiality assurance, with less consideration on integrity assurance and weakness in expressing channel control policies. Besides, the trusted subjects it introduces to handle the information flow "downgrade" have many security flaws. Moreover, increasing diversity of the computing environments results in various security requirements. However, current mainstream security models are aiming at only one or few requirements of them each. The Multi-Policy Views Security Model is presented, which is based on the MLS model, combining the domain and role attributes to the model, to enforce the expression power in channel control policies, make permission management more fine-grained and enhance the ability of confining the permission of the trusted subjects. Moreover, MPVSM has integrated the properties and functions of MLS, Domain-Type and Role Based models into one unified model. It is able to enforce multi-policy views in operating system in a flexible way.