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Oct 10, 2019 OpenVPN server.conf and client.conf. GitHub Gist: instantly share code, notes, and snippets. You will need to generate # your server certificates with the keyUsage set to # digitalSignature, keyEncipherment. # openvpn -genkey -secret ta.key #. R/homelab: Welcome to your friendly /r/homelab, where techies and sysadmin from everywhere are welcome to share their labs, projects, builds, etc. OpenVPN Certificates and Keys. Before you start to set up the OpenVPN network, you need to make the related certificates and keys for VPN server and VPN clients. Generate OpenVPN Certificates and Keys. Generate OpenVPN certificates and keys for Yeastar S-Series VoIP PBX and clients. Feb 09, 2018 The command below will generate the client’s private key and it’s Certificate Signing Request (CSR). The client in this tutorial is called Client2. The script will prompt for a password related to the client’s private that is used by OpenVPN when attempting to connect using the configuration file.
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OpenVPN ¶ According to. Generate a PSK with the command: openvpn-genkey-secret ta. Add the following line to your server configuration: tls-auth ta. Add the following line to your server configuration: tls-auth ta. Beware, the –tls-auth key is changed, it must be changed on all peers at the same time, so it could. Preparatory Steps. Press Windows Key + R. Type 'cmd.exe' and press Enter. Navigate to the correct folder whether it's x32 or x64 system: cd 'C: Program Files OpenVPN easy-rsa'. Cd 'C: Program Files (x86) OpenVPN easy-rsa'. Initialize the OpenVPN configuration: init-config. NOTE: Only run.
What is OpenVPN?
As noted previously in our OpenVPN article, OpenVPN is an open-source Windows software package used to create a secure, site-to-site VPN connection that provides remote access between two locations. OpenVPN consists of three parts:
- The OpenVPN-AS Server
- The Admin Web Interface/Admin GUI
- The Connection Clients
The OpenVPN Server
The OpenVPN server is the principal element of the OpenVPN-AS Server and manages the main functions on the backend. Some of the functionality that is handled in the admin interface includes tunneling, routing, encryption, user management, authentication, and many other features. The OpenVPN server also consists of a WebGUI, which assists with control in several of the fundamental components of the software.
The Main WebGUI Administrative Interface
The main web-based GUI allows for the uncomplicated handling of the OpenVPN server elements. In the WebGUI, an admin can check routing options, privileges, network configurations, user validation, and other parameters. By default, an administrator can connect to the GUIWeb gateway by browsing to https://serverip:943/admin
The OpenVPN Connect Clients
The OpenVPN client is also an important part of the OpenVPN software. This application allows users to link to the VPN server directly in one of three ways. The VPN Client also offers the ability to download the user’s configuration file, which can be duplicated to other OpenVPN clients. The three options are:
- Browser Connect Client – This is the browser-based connection tool for openvpn. The web address for users is https://serverip:943
- OpenVPN Connect Client (Mac) – Simplistic single connection client
- OpenVPN Connect Client (Linux/Windows) – This is the OpenVPN client (which is different from the main openvpn-as program). This software requires a configuration file to work correctly.
Install OpenVPN
On a Windows server, we begin by downloading the Windows installer from here and then running it on our Windows server.
Certs and Keys
Prerequisites
Browse to the
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folder using the administrative command prompt:
- Open the Start menu
- Type in “cmd”
- Next, right click on “Command Prompt” and select “Run as Administrator.”
- Then, right click the menu item “Command Prompt”
- On the “User Account Control” pop up window, click “Yes”
Navigate to this folder.
And now, we can start the OpenVPN configuration:
Only run init-config once during installation.
Next, we open the “vars.bat” file in a text editor.
And edit the subsequent lines switching “US”, “CA,” etc. with your business’s data.
We can then save the file and exit Notepad.
The KEY_CN and KEY_NAME fields will be unique for each build request. The KEY_CN and KEY_NAME settings refer to the common name field and the name of the certificate.
The KEY_OU setting refers to an “Organizational Unit” and can be set to whatever if there isn’t a requirement for it.
The PKCS11_ values refer to settings used for Hardware Security Modules and Smart Cards if you use them.
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Next, we will run the following commands.
Building Certificates and Keys
In order to create the Certificate Authority (CA) certificate and key, we need to run.
This will prompt you to enter your country, state, and city. These options will also have default values, which appear within brackets.
For the “Common Name,” a beneficial choice is to choose a unique name to distinguish your company.
For the “Common Name,” a beneficial choice is to choose a unique name to distinguish your company.
Next, we initiate the server’s certificate and key using this command:
- When prompted, enter the “Common Name” as “server”
- When prompted to sign the certificate, enter “y”
- When prompted to commit, enter “y”
Server Certificates and Keys:
Client Certificates and Keys
For each client that will be connecting to the server, we must choose a unique name to identify that user’s computer, such as “david-laptop” in the example below.
Next, when prompted, we enter the “Common Name” as the name you have chosen for the client’s cert/key.
We will repeat this step for every client computer that is going to connect to the VPN.
Now, we need to generate the “Diffie Hellman” parameters using the build-dh command. This step is necessary in order to set up the encryption model.
Next, we will generate a shared secret key (which is required when using tls-auth)
Configuration Files
OpenVPN provides sample configuration data which can easily be found using the start menu:
Start Menu -> All Programs -> OpenVPN -> OpenVPN Sample Configuration Files
Start Menu -> All Programs -> OpenVPN -> OpenVPN Sample Configuration Files
Server Config File
Now, let’s copy the sample “server configuration” file over to the easy-rsa folder. Here is the command and its output:
Next, we will need to edit the server.ovpn file.
Now, locate the following lines within the file:
And edit them as follows:
Finally, save and close the file.
Client Config Files
The client file modification is very similar to the server configuration changes we made earlier. Let’s copy the sample server configuration file to the easy-rsa folder with the client’s Common Name as the file name. (Remember, each client will need to have a unique filename).
![Generate ta key openvpn windows 7 Generate ta key openvpn windows 7](https://i.imgur.com/4oSi5n5.png)
Next, we will edit the client’s config file.
We will locate the following settings in the file and edit them as follows:
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Observe that the name of the client certificate and related key files rely upon the “Common Name” of each client.
We can also include the ca, cert, and key content in the client file. We will have to copy the file content from inside the tags:
- <ca></ca>
- <cert></cert>
- <key></key>
Next, we will edit the line “my-server-1“, replacing it with the server’s public IP Address or Domain Name.
Finally, we can save and close the file.
Copying the Client and Server Files to Their Pertinent Directories
Now we can copy these files from C:Program FilesOpenVPNeasy-rsakeys to C:Program FilesOpenVPNconfig on the server using the robocopy command:
- ca.crt
- ta.key
- dh2048.pem
- server.crt
- server.key
- server.ovpn
The space at the end of the path in each string is important.
Now, we can copy the following files from C:Program FilesOpenVPNeasy-rsakeys on the server to C:Program FilesOpenVPNconfig for each client that will be using the VPN (e.g., david-laptop, in this example)
- ca.crt
- ta.key
- david-laptop.crt
- david-laptop.key
- david-laptop.ovpn
Starting OpenVPN
Next, on both the server and the client, we need to run OpenVPN from:
Start Menu -> All Programs -> OpenVPN -> OpenVPN GUI
Start Menu -> All Programs -> OpenVPN -> OpenVPN GUI
Now, let’s double click the icon which appears in the system tray to start the connection. The subsequent dialog box will close upon an effective start.
Final Thoughts
Firewall Settings
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If you have any connection difficulties, ensure you set up a rule on the server’s firewall allowing incoming UDP traffic on port 1194. (Win+R “wf.msc”)
Running OpenVPN as a Service
We can also run OpenVPN as a service, which will allow:
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- OpenVPN to be run from a non-administrative account.
- OpenVPN to be started automatically on the systems startup. This is the preferred method to use on a server, as well as any clients which will be continually connecting to the server.
- To run the Windows Service administrative tool:
(Press Windows Key+R)
Type in “services.msc” and press ‘Enter’ to start the services.msc tool. Next, locate the OpenVPN service, and reset its Startup Type to “automatic.” Optionally, you can start the service now if desired.
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Security Tips
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We can also run OpenVPN as a service, which will allow:
- OpenVPN to be run from a non-administrative account.
- OpenVPN to be started automatically at the systems startup. This is the preferred method to use on a server, as well as any clients which will be continually connecting to the server.