Bài Lab 17.1 Triển Khai Hệ Thống OPENVPN

Downloading and Installing OpenVPN

1. Download the installer from ​here and run it on the server computer.(copy từ máy giáo viên tập tin openvpn-2.2.2-install.exe)

2. Install OpenVPN on each client. (This step can be skipped for now and done at any convenient time)

Certificates and Keys

Preparatory Steps

1. Navigate to the C:\Program Files\OpenVPN\easy-rsa folder in the command prompt:
   1. Press Windows Key + R
   2. Type "cmd.exe" and press Enter.

      cmd.exe
      

   3. Navigate to the correct folder:

      cd "C:\Program Files\OpenVPN\easy-rsa"
      

2. Initialize the OpenVPN configuration:

   init-config
   

   • NOTE: Only run init-config once, during installation.

3. Open the vars.bat file in a text editor:

   notepad vars.bat
   

4. Edit the following lines in vars.bat, replacing "US", "CA," etc. with your company's information:

   set KEY_COUNTRY=US
   set KEY_PROVINCE=CA
   set KEY_CITY=SanFrancisco
   set KEY_ORG=OpenVPN
   set KEY_EMAIL=mail@host.domain
   

5. Save the file and exit notepad.

6. Run the following commands:

   vars
   

   clean-all
   

Building Certificates and Keys

1. The certificate authority (CA) certificate and key:

   build-ca
   

   • When prompted, enter your country, etc. These will have default values, which appear in brackets. For your "Common Name," a good choice is to pick a name to identify your company's Certificate Authority. For example, "OpenVPN-CA":

     Country Name (2 letter code) [US]:
     State or Province Name (full name) [CA]:
     Locality Name (eg, city) [SanFrancisco]:
     Organization Name (eg, company) [OpenVPN]:
     Organizational Unit Name (eg, section) []:
     Common Name (eg, your name or your server's hostname) []:OpenVPN-CA
     Email Address [mail@host.domain]:
     

2. The server certificate and key:

   build-key-server server
   

   • When prompted, enter the "Common Name" as "server"
   • When prompted to sign the certificate, enter "y"
   • When prompted to commit, enter "y"

3. Client certificates and keys:

1. For each client, choose a name to identify that computer, such as "vinh-laptop" in this example.

   build-key vinh-laptop
   

   • When prompted, enter the "Common Name" as the name you have chosen (e.g. "vinh-laptop")
2. Repeat this step for each client computer that will connect to the VPN.

4. Generate Diffie Hellman parameters (This is necessary to set up the encryption)

   build-dh
   

Configuration Files

1. Find the sample configuration files:

   Start Menu -> All Programs -> OpenVPN -> OpenVPN Sample Configuration Files
   

Server Config File

1. Open server.ovpn

2. Find the following lines:

   ca ca.crt
   cert server.crt
   key server.key
   

   dh dh1024.pem
   

3. Edit them as follows: (lưu ý trên hệ thống 64 bit là Program Files (x86) )
   

   ca "C:\\Program Files\\OpenVPN\\config\\ca.crt"
   cert "C:\\Program Files\\OpenVPN\\config\\server.crt"
   key "C:\\Program Files\\OpenVPN\\config\\server.key"
   

   dh "C:\\Program Files\\OpenVPN\\config\\dh1024.pem"
   

4. Save the file as C:\Program Files\OpenVPN\easy-rsa\server.ovpn

Client Config Files

This is similar to the server configuration

1. Open client.ovpn

2. Find the following lines:

   ca ca.crt
   cert client.crt
   key client.key
   

3. Edit them as follows:

   ca "C:\\Program Files\\OpenVPN\\config\\ca.crt"
   cert "C:\\Program Files\\OpenVPN\\config\\vinh-laptop.crt"
   key "C:\\Program Files\\OpenVPN\\config\\vinh-laptop.key"
   

   • Notice that the name of the client certificate and key files depends upon the Common Name of each client.

4. Edit the following line, replacing "my-server-1" with your server's public Internet IP Address or Domain Name. If you need help, see Static Internet IP below.

   remote my-server-1 1194
   

5. Save the file as C:\Program Files\OpenVPN\easy-rsa\mike-laptop.ovpn (in this example. Each client will need a different, but similar, config file depending upon that client's Common Name.)

Copying the Server and Client Files to Their Appropriate Directories

1. Copy these files from C:\Program Files\OpenVPN\easy-rsa\ to C:\Program Files\OpenVPN\config\ on the server:

   ca.crt
   dh1024.pem
   server.crt
   server.key
   server.ovpn
   

2. Copy these files from C:\Program Files\OpenVPN\easy-rsa\ on the server to C:\Program Files\OpenVPN\config\ on each client (mike-laptop, in this example):

   ca.crt
   mike-laptop.crt
   mike-laptop.key
   mike-laptop.ovpn
   

Starting OpenVPN

1. On both client and server, run OpenVPN from:

   Start Menu -> All Programs -> OpenVPN -> OpenVPN GUI
   

2. Double click the icon which shows up in the system tray to initiate the connection. The resulting dialog should close upon a successful start.