Overview
This lecture covers Access Control Lists (ACLs), explaining their purpose, structure, and applications for both file systems and network security.
Access Control Lists (ACLs)
- An Access Control List (ACL) defines permissions for objects such as files or folders.
- ACLs are structured as tables or databases listing access rights for users or groups.
- Each ACL is made up of multiple Access Control Entries (ACEs).
- ACEs specify what actions (read, write, execute) are allowed or denied for a user or group on an object.
Network Security and ACLs
- ACLs are used in network devices like routers, switches, and firewalls for security.
- Network ACLs restrict access to hosts or services within a network.
- They can be applied to both incoming and outgoing network traffic.
- Network ACLs help enforce policies, restrict external system access, and prevent unauthorized outbound data transfers.
Key Terms & Definitions
- Access Control List (ACL) — a table or database specifying access permissions for objects.
- Access Control Entry (ACE) — an individual entry in an ACL defining a user or group's permissions.
- File System ACL — an ACL applied to files, folders, or programs to control access.
- Network ACL — an ACL used on network devices to control network traffic and access.
Action Items / Next Steps
- Review examples of file system and network ACL configurations.
- Prepare to identify and interpret ACLs on various operating systems and network devices.