Mandatory access controls restrict this capability. leaves a certain amount of access control to the discretion of the object's owner, or anyone else who is authorized to control the object's access. The owner can determine who should have access rights to an object and what those rights should be.
In computer security, Mandatory Access Control (MAC) is access control that restricts a subject or initiator's ability for an operating system or database to access an object or target, or generally perform some operation on an object or target. refers to a type of In operating systems, subjects are usually processes or threads.
Objects are building blocks such as files, directories, TCP/UDP ports, shared memory segments, and IO devices. Subjects and objects each have a set of security attributes. Each time a subject attempts to access an object, authorization rules applied by the operating system kernel examine these security attributes to determine whether access is allowed.
Any operation by any subject on any object is tested against a set of authorization rules (aka policies) to determine if the operation is permitted. Database management systems can also enforce mandatory access controls in their access control mechanisms. In this case, the objects are tables, views, procedures, and so on.
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