Description: Policy mapping in SELinux refers to the association of security policies with specific resources or actions within an operating system. SELinux, which stands for Security-Enhanced Linux, is an implementation of mandatory access control (MAC) that provides a robust framework for managing security in operating systems. Through policy mapping, SELinux defines how processes can interact with system objects such as files, ports, and devices. This is achieved by creating rules that specify which actions are allowed or denied for each type of process and resource. Policy mapping is essential to ensure that applications and users only have access to the resources necessary for their operation, thereby minimizing the risk of vulnerabilities and attacks. This granular approach allows system administrators to establish a secure and controlled environment where every action is regulated by defined policies, contributing to the integrity and confidentiality of data. In summary, policy mapping in SELinux is an essential tool for implementing effective security measures in operating systems, providing detailed control over the interactions between processes and resources.
History: SELinux was developed by the National Security Agency (NSA) in the early 2000s as part of an effort to enhance the security of Linux systems. Its design is based on mandatory access control principles, which were initially implemented in operating systems like Multics. Over the years, SELinux has evolved and been integrated into various Linux distributions, becoming a standard for security in enterprise environments.
Uses: SELinux is primarily used in environments where security is critical, such as web servers, databases, and sensitive information systems. It allows administrators to define security policies that control access to resources and the execution of processes, helping to prevent attacks and unauthorized access.
Examples: A practical example of policy mapping in SELinux is the configuration of policies that restrict a web server’s access to certain directories in the file system, ensuring it can only access the files necessary for its operation. Another example is the implementation of policies that limit the network connections of a specific application, protecting it from potential external attacks.
