Using labeled IPsec with SELinux
Although setting up and maintaining an IPsec setup is far beyond the scope of this book, let's look at a simple IPsec example to show how to enable labeled IPsec on a system. Remember that the labeled network controls on the interface, node, and peer levels, as mentioned earlier, are automatically enabled the moment we use labeled IPsec.
In an IPsec setup, there are three important concepts to be aware of:
- The security policy database (SPD) contains the rules and information for the kernel to know when communication should be handled by an IP policy (and, as a result, handled through a security association).
- A security association (SA) is a one-way channel between two hosts and contains all the security information about the channel. When labeled IPsec is in use, it also contains the context information of the client that caused the security association to materialize.
- The security association database (SAD) contains the individual...
