What are access control lists and how do they work?

What are access control lists and how do they work?

Access Control Lists (ACLs) are a set of rules that determine who can access certain resources in a system. They specify which users or groups have permission to perform actions like read, write, or execute on a resource.

Can you give me an example of how ACLs are used in a file system?

Sure! In a file system, an ACL might specify that User A can read and write a file, User B can only read it, and User C has no access at all. This way, the file's owner controls who can do what with it.

What happens if an ACL is not set on a resource?

If an ACL is not set, the default permissions apply, which may allow all users to access the resource or restrict access entirely, depending on the system's configuration.

Are there different types of ACLs?

Yes, there are mainly two types: Discretionary Access Control Lists (DACLs), which specify permissions for users, and Mandatory Access Control Lists (MACLs), which enforce policies set by the system administrator.