Description: The resource limitation of AppArmor refers to the ability of this security system to restrict applications’ access to certain resources of the operating system. AppArmor uses security profiles that define which files, directories, and capabilities can be accessed by each application. This means that even if an application is compromised, its ability to interact with the system is severely limited, reducing the risk of damage. This feature is fundamental for security, as it allows system administrators to establish specific access policies, ensuring that applications can only operate within the defined limits. The implementation of these restrictions is carried out through a policy-based approach, where each profile can be adjusted to meet the security needs of the organization. Additionally, AppArmor allows the creation of profiles in ‘enforcing’ and ‘complain’ modes, facilitating the testing and adjustment of security policies without disrupting application functionality. In summary, the resource limitation of AppArmor is a powerful tool for protecting operating systems, providing granular control over access to critical resources and contributing to a more robust security posture.
History: AppArmor was developed by Immunix in 2003 as a response to the need for a more flexible and user-friendly access control system than SELinux. In 2009, Canonical, the company behind Ubuntu, acquired AppArmor and integrated it into its distribution, which helped increase its popularity. Since then, it has evolved over time, incorporating new features and improvements in its functionality.
Uses: AppArmor is primarily used in Linux-based operating systems to protect critical applications and system services. It is especially popular in server environments and in various Linux distributions, where it is used to protect applications such as web servers, databases, and other network-exposed services.
Examples: A practical example of AppArmor is its use on a web server running a common web server application. By creating a profile for the application, access can be restricted to only the necessary directories, preventing an attacker who compromises the server from accessing sensitive system files. Another example is the use of AppArmor to protect desktop applications, limiting their access to system files and the network, which helps prevent the exploitation of vulnerabilities.
