Chương 4: Access Control, Authorization
Definitions
Access Rights
Access Control Systems
Authorization
Types of Authorization Systems
Authorization Principles
Authorization Granularity
Web Access and Authorization
Definitions
Access control is a process to determine “Who does what to what,” based on a policy.
Access control is one of the major cornerstones of system security
Access Rights
Access control consists of four elements: subjects, objects, operations, and a reference monitor.
Subjects are system users and groups of users
Objects are files and resources such as memory, printers, and scanners including computers in a network.
An access operation comes in many forms including Web access, server access, memory access, and method calls
Access Control List(ACL)
Whenever a subject requests to access an object, an access mode must be specified:
Observe: subject may only look at the content of the object
Alter: the subject may change the content of the object
Access rights refer to the user’s ability to access a system resource. There are four access rights: execute, read, append, and write.
Access rights and access modes are different
Access rights can be set individually on each system resource for each individual user and group.
User can belong to many groups and enjoy those groups’ rights.
User access rights and group access rights
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