Multiple CAs - stacking, using the capath directive
The goal of this recipe is to create an OpenVPN setup where the client certificates are signed by a "client-only" CA and the server certificate is signed by a different "server-only" CA. This provides an extra level of operational security, where one person is allowed to create only client certificates, whereas another is allowed to generate only a server certificate. This ensures that the client and server certificates can never be mixed for a Man-in-the-Middle attack.
Getting ready
Set up the server certificate using the first recipe from Chapter 2, Client-server IP-only Networks. Use the client certificate and the intermediary CA certificate from the previous recipe. For this recipe, the server ...
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