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Introduction

Libreswan is an open-source implementation of the Internet Protocol Security (IPsec) protocol. IPsec is a widely used technology for securing communication over the internet. Labeled IPsec is an extension of IPsec that provides mandatory access control (MAC) to IPsec packets based on the security labels. In this article, we will discuss how labeled IPsec can be implemented with Libreswan.

Implement labeled IPsec

To implement labeled IPsec with Libreswan, we need to use the Security Enhanced Linux (SELinux) policy. SELinux provides a mechanism for labeling the network traffic based on security policies. The labeled IPsec implementation requires the SELinux policy to label the IPsec packets based on the security context of the process that creates them.

SELinux: Enhancing System Security

SELinux stands for Security-Enhanced Linux, which is a security module implemented in the Linux kernel. It provides an additional layer of security by enforcing mandatory access control policies on top of the traditional discretionary access control mechanisms provided by the Linux kernel. SELinux was developed by the National Security Agency (NSA) and external contributors in collaboration with Red Hat and has been integrated into various Linux distributions, including Red Hat Enterprise Linux, Rocky Linux, AlmaLinux, and Fedora.