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Multi-tenancy authorization models for collaborative cloud services

CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE 2015年第11期27卷 2851-2868页

作者： Tang, Bo Sandhu, Ravi Li, Qi Univ Texas San Antonio Inst Cyber Secur San Antonio TX 78249 USA Univ Texas San Antonio Dept Comp Sci San Antonio TX 78249 USA Tsinghua Univ Grad Sch Shenzhen Shenzhen 518055 Peoples R China

The cloud service model intrinsically caters to multiple tenants, most obviously not only in public clouds but also in private clouds for large organizations. Currently, most cloud service providers isolate user activities and data within a single tenant boundary with no or minimum cross-tenant interaction. It is anticipated that this situation will evolve soon to foster cross-tenant collaboration supported by Authorization as a Service. At present, there is no widely accepted model for cross-tenant authorization. Recently, Calero et al. informally presented a multi-tenancy authorization system (MTAS), which extends the well-known role-based access control model by building trust relations among collaborating tenants. In this paper, we formalize this MTAS model and propose extensions for finer-grained cross-tenant trust. We also develop an administration model for MTAS. We demonstrate the utility and practical feasibility of MTAS by means of an example policy specification in extensible access control markup language. To further test the metrics of the model, we develop a prototype system and conduct experiments on it. The result shows that the prototype has 12-ms policy decision overhead on average and is scalable. We anticipate that researchers will develop additional multi-tenant authorization models before eventual consolidation and convergence to standard industry practice. Copyright (c) 2014 John Wiley & Sons, Ltd.

关键词： security models for cloud computing access control in collaboration environments role-based access control reputation and trust fundamentals and frameworks for security in collaboration systems privacy protection for collaboration systems

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Multi-tenancy authorization models for collaborative cloud services

Multi-tenancy authorization models for collaborative cloud s...

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International Conference on collaboration Technologies and systems (CTS)

ISBN: (纸本)9781467364027

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