Description: Labeled Security in SELinux is a security model that uses labels to enforce access control in operating systems. Unlike traditional access control models, which rely on user and group identities, SELinux implements a more granular approach by using security labels assigned to objects (such as files, processes, and ports) and subjects (such as users and programs). These labels define access policies, allowing or denying interactions between subjects and objects based on established rules. This model provides greater protection against unauthorized access and vulnerabilities, as it restricts the actions a process can take based on its label, regardless of the identity of the user executing it. The flexibility of SELinux allows administrators to define custom security policies, adapting to the specific needs of each environment. In summary, Labeled Security in SELinux is a crucial component for implementing robust and effective access control in various operating systems, enhancing the overall security of computing environments.
History: SELinux was developed by the National Security Agency (NSA) of the United States in the 2000s as part of an effort to enhance the security of Linux operating systems. Its design is based on the Bell-LaPadula security model, which focuses on information confidentiality. Over the years, SELinux has evolved and been integrated into many Linux distributions, becoming a standard tool for security in enterprise environments.
Uses: SELinux is primarily used in servers and critical systems where security is a priority. It allows administrators to define detailed access policies that protect system resources from unauthorized access. It is also used in container environments, where it helps isolate applications and services, ensuring that one container cannot affect others or the host system.
Examples: A practical example of SELinux is its implementation in web servers, where it can be configured to restrict access to sensitive configuration files and limit the actions that server processes can perform. Another example is its use in database systems, where SELinux can protect sensitive data through policies that control who can access what information and how.
