Abstract
In recent years, Role-Based Access Control (RBAC) is apopular privilege management model at home and abroad, which has a distinct advantage than the other traditional access control technologies such as MAC and DAC.The basic principle of RBAC introduces the concept of role endued with authority between user and privilege, and user is also endued with role.However, RBAC still has its limitations when it comes to applications in meteorological department of CMA with fine-grained data access control, and distinct definition.To meet the growing demand for data sharing, a novel access control management model must be built.According to the requirements and characteristics of meteorological data sharing, a model is proposed for a general solution of data-sharing privilege management and multi-dimensional data-sharing privilege management, which is improved from RBAC model.As a shared data resource, meteorological data have a large number of classifications, with a complex hierarchical structure, and very fine particle size of retrieving. In consideration of these comprehensive characteristics, this model introduces the concept of targeted object dimensions in RBAC on the basis of more flexible rights management mechanisms and calculation formula, which improves the security and flexibility of the data sharing services to meet the needs.This model decomposes the fine-grained access privilege of sources by object dimension, and realizes access control of different levels from coarse-grained to fine-grained. The model can authorize directly not only the role but also the user, which greatly improves the flexibility and scalability.The model has been developed as re-pilot study in China Integrated Meteorological Information Sharing System (CIMISS), which is the key project and the practical application of operational systems involved in the meteorological department. A prototype system is built to verify this model. Its deployment is helpful to manage the data retrieving and information access, and simplifies data authorization, maintenance management process, and improves data security. The model supports general security framework of the meteorological database information services, which prevents unauthorized user to access data. As a result, high stability and good security of the simple privilege management model are achieved, and security management information systems based on this model will play an important role in the meteorological data service in the future operations.
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