Once implemented it also imposes a high system management overhead due to the need to constantly update object and account labels to accommodate new data, new users and changes in the categorization and classification of existing users. Firstly, MAC requires a considerable amount of planning before it can be effectively implemented. Mandatory Access Control is by far the most secure access control environment but does not come without a price. A user with top secret classification, for example, cannot access a resource if they are not also a member of one of the required categories for that object. It is important to note that both the classification and categories must match. If the user's credentials match the MAC security label properties of the object access is allowed. When a user attempts to access a resource under Mandatory Access Control the operating system checks the user's classification and categories and compares them to the properties of the object's security label. Similarly, each user account on the system also has classification and category properties from the same set of properties applied to the resource objects. These security labels contain two pieces of information - a classification (top secret, confidential etc) and a category (which is essentially an indication of the management level, department or project to which the object is available). Mandatory Access Control begins with security labels assigned to all resource objects on the system.
It is not possible under MAC enforcement for users to change the access control of a resource. As such, all access to resource objects is strictly controlled by the operating system based on system administrator configured settings. Under a MAC enforced environment access to all resource objects (such as data files) is controlled by settings defined by the system administrator. MAC takes a hierarchical approach to controlling access to resources.
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