How do I import external certificates into OpenVPN?

I have been working with OpenVPN for a while and I am comfortable with the basic setup. I have a client-server setup and my OpenVPN server is configured to use a certificate, the CA certificate is added to the keystore.

But how do I import external certificates into my OpenVPN server? How do I add these to the OpenVPN server so that the client has access to them? The certificates used by the OpenVPN client are contained in the private key of the client. If you want to store those certificates on the server, you can use either keystore or truststore. The keystore is a file containing a collection of keys, and the truststore is a file containing a collection of trusted certificates (a trusted CA certificate, plus all the intermediate certificates). If you don't specify a truststore or keystore, then the system defaults to using a keystore, and the keystore is used to store both the server's keys and the client's keys.

If you use keystore, you create the keystore when you start OpenVPN, and you must have the private key password available. The file format for keystore is JKS. The documentation explains it well enough:
For truststore, it's simpler: you just add the CA certificates to the keystore. If you use a standard Linux distribution, you should already have all the certificates installed as system CA certificates. You will also have the CA root certificate of the OpenVPN server. Just use the command line tools to add the certificate:
Sudo keytool -import -keystore keystore.jks -trustcacerts -alias ca-root -file ca.crt
The name of the truststore is keystore. You don't need to specify the type of the keystore. The command will also prompt you for the private key password.

You can verify that the new certificate is in the truststore: keytool -list -v -keystore keystore.jks -alias ca-root If you are using Windows, then you can use the same commands from the command line. Or you can use a graphical tool such as Certificates MMC snap-in.

Does OpenVPN use certificates?

This is one of the most frequently asked questions about OpenVPN. Does it use certificates? Is the certificate stored in OpenVPN, or in a configuration file? How is that used when establishing tunnels? Well, it's a lot of different things combined, so I want to go through each bit and explain them briefly to make this easier for future users to understand.

So, yes, OpenVPN does use certificates. The certificates have three parts to them: public, private, and secret.

The public is the fingerprint of the certificate itself, and is sent to everyone that should have access to it. So if someone gets the certificate by accident, they could still send the public to others. That makes no sense. If you want security on your connections, and want to be sure who is communicating, you must encrypt, authenticate, and identify your communications. If someone can sniff your network traffic to get the actual keys, then you can't authenticate, identify, or encrypt without having a copy of the keys somewhere.

The other two parts are private, which consists of the algorithm used to encrypt the traffic, and the secret key to decrypt it. Again, you would never broadcast that key. That's called a symmetric encryption key. To make it more confusing than useful, OpenVPN will also offer symmetric key authentication by telling other devices that are connecting to you that they know the "secret" key you are using. This key exists in the VPN configuration file, not in any storage you send to them. This is called an asymmetric encryption key.

So, all of the certificates are handled through the OpenVPN binary, like this: root@dev:~# openvpn --showcerts root@dev:~# ./openvpn --showcerts --config server3.conf root@dev:~#

This is also shown on other pages in this documentation, as well as in the config files themselves. That is what I'm going to refer to from here on in.

Using a static key. To answer the initial question, a static certificate can be either a self-signed certificate, or it can be signed by another certificate authority. The two most common use cases for static certificates in OpenVPN are adding authentication with strong encryption (eg, HTTPS), and improving the performance of the VPN.

How to import ovpn in OpenVPN?

I was wondering if there is a way to import OVpn connection into OpenVPN. The reason I need it is the following. My workplace use Cisco VPN, and I am using a client that allow me to connect through the VPN, have access to all servers in the network, but still be connected locally. However, sometimes I go home and don't connect to work, just stay connected to my home internet. I'd like to create a configuration file so that the VPN client can automatically reconnect to my home network when I get on (I don't want to use manual connections). Is it possible?

Thanks for your help. Re: ? If you need to set up a VPN server, you may consider the IKEv2 IPSec and L2TP/IPSec protocols for remote access to local area networks. The advantage of these protocols is that they will offer security and integrity services to clients over a "tunnel" created on the open Internet.

If you require VPN-like service on the Internet and would prefer to create an encrypted tunnel (such as when you want to secure a private network, or access your company network from a non-work location), then the Cisco "clientless" VPN (CLVPN) technology is the correct solution for you. Cisco CLVPN technology can also provide both VPN client (for remote connectivity from a non-Cisco device) and VPN server functionality (to provide VPN services to users located on a corporate network).

How do I add a client certificate to OpenVPN?

I'm trying to use a client certificate (and key) when connecting to my OpenVPN server. The OpenVPN server is running on a Windows machine.

I used the following in my "server.conf" file: . cert client.crt key client.key . And, in my client.conf file, I have: c:/mycert/ca.crt c:/mycert/client.crt c:/mycert/client.key I ran the OpenVPN server as follows: openvpn --config c:/myconfig/c:server.conf -auth username:password --cdns --auth-userpass The client tries to connect but fails with this error message: Trying 192.168.100.

PING 192.10 (192.10): 48 data bytes
Ping: sendto: No route to host. I tried changing the entry to c:/ca.crt (as suggested in an OpenVPN forum post). But, that didn't help.

Any ideas? Turns out, I had multiple openvpn instances running (as per How do I stop a running OpenVPN service? I restarted the instance that was in charge of the client and it worked!