Over the past couple of weeks, I have been fighting with getting an LTE device running The Rooter Project to establish an OpenVPN connection with a Mikrotik router. Apparently, OPENVPN is the only option when it comes to VPNs on The Rooter Project. For the purpose of this article, I am going to refer to the software as “the rooter”. This is just to denote the device running The Rooter Project software. In my case, this is a GL.iNET GL-X750 LTE device.
There are two parts to this setup. The OpenVPN setup on the Mikrotik and the setup on the rooter.
The Mikrotik setup is pretty straight forward. There are some great tutorials out there for a more in-depth setup. The RouterOS version I used for this setup is 6.47.
You will need to create 3 certificates on the Mikrotik.
/certificate add name=ca-template common-name=example.com days-valid=3650 key-size=2048 key-usage=crl-sign,key-cert-sign add name=server-template common-name=*.example.com days-valid=3650 key-size=2048 key-usage=digital-signature,key-encipherment,tls-server add name=client-template common-name=client.example.com days-valid=3650 key-size=2048 key-usage=tls-client
Once you have created the above certificates you will need to sign them with the following
/certificate sign ca-template name=ca-certificate sign server-template name=server-certificate ca=ca-certificate sign client-template name=client-certificate ca=ca-certificate
Run the following commands to add a passphrase to your key certificate and export them to files
/certificate export-certificate ca-certificate export-passphrase="" export-certificate client-certificate export-passphrase=j2sw123com
This will give you three files:
cert_export_client-certificate.key. Download these out of “files” from the Mikrotik to the same computer you have access to the rooter on. I like to rename them to
client.key so I can keep track of what is what.
Rooter Client Setup
I could not find out how to make the operating system read a config file I would edit by hand. Even after a reboot, the config file would not be read. I am not sure if there is a command to read it into the running-config. If someone knows, let me know and that will make this process much easier.
client dev tun proto tcp remote example.com 1194 resolv-retry infinite nobind persist-key persist-tun ca ca.crt cert client.crt key client.key remote-cert-tls server cipher AES-128-CBC auth SHA1 auth-user-pass redirect-gateway def1 verb 3
In my rooter, the config is in /var/etc. I would cat this occasionally to make sure I did not have any extra options turned on. Since I could not make my edits the file stick, I would make the below changes in the GUI and verify they matched up to my above file.
If your OpenVPN is using a username and password create a file named passowrd.txt and put the username on the first line and the password on the second.
You will need that file along with the three files you generate on the Mikrotik above.
Log in to the router and create you an open VPN instance. In my case, I named it Nexstream because this is who I was working for on this project. You can name it anything you want.
Click on edit and you will be brought to the following screens. Fill them out as shown.
When you get to the bottom this is where you upload your password.text and your cert and key files. If you see anything missing go to the bottom and select the field and click add.
Make sure to hit save and apply before proceeding. Click on “switch to advanced configuration”. Match up your configuration with the following screenshots, which match up with the above config file. You are just basically making the proper checkboxes to match the plain text config I posted above. Again, if anyone knows how to get OpenVPN. on the rooter to read the config in let me know.
Once you have the GUI part done and the certs uploaded to the rooter you will need to deal with the keyphrase via the command line. Simply SSH to the rooter. The below code is a generic code for changing the client.key to not ask for a passphrase anymore.
cd /etc/luci-uploads/ openssl.exe rsa -in client.key -out client.key Enter pass phrase for client.key: j2sw123com writing RSA key
Couple of things to note about the process.
1. Your location may vary. You must either be inside the directory with your keys or provide the path to the keys in the OpenSSL command
2.when I uploaded the keys it changed them to cbid.openvpn.FRIENDLYNAME.key.
what my actual code looked like to change the passphrase
cd /etc/luci-uploads/ openssl.exe rsa -in cbid.openvpn.vpnout.key -out cbid.openvpn.vpnout.key Enter pass phrase for client.key: j2sw123com writing RSA key
If everything goes well you will be rewarded with the following screen on your OpenVPN main page. If, for some reason, it does not start the system log is actually pretty informative on what is going on.