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This is a guide on how to connect a PC on the internet, to LAN behind a pfSense firewall using OpenVPN. This is also known as a Road-Warrior setup. Windows Vista requires administrative priviledges to run and properly configure OpenVPN.
1. Download and install the most recent software from OpenVPN Downloads. If you plan to connect from a PC with Windows Vista or 7 you should get version 2.1 or newer. Windows XP works well with 2.1 as well.
For windows 7 please read http://www.hpchost.com/knowledgebase.php?action=displayarticle&id=204
Use the default options when installing.
2. Start a command prompt with administrator-rights!
- This is done in Vista by clicking on START and then type CMD -> CMD.EXE should appear, and you RIGHT-Click on it and select 'Run as Administrator'.
- If your account has administrative-rights, XP's command prompt automatically runs with them.
3. Change directory to c:\programfiles\openvpn\easy-rsa
4. Run the "init-config.bat" file
5. Edit 'vars.bat' file. 'Worpad' is suggested but Notepad will be fine. For Vista, you need to start Wordpad/Notepad with administrative-rights. (Click on START and then type CMD -> CMD.EXE should appear, and you RIGHT-Click on it and select 'Run as Administrator'.) The following things need to be edited:
"set KEY_COUNTRY=US"
Your 2 Letter country ID Goes Here
"set KEY_PROVINCE=NA"
2 Letters Province ID - Or use NA as in 'Not Applicable'
"set KEY_CITY=Copenhagen"
Name of Your City
"set KEY_ORG=pfSense"
Name of your company
"set KEY_EMAIL=youremail@address.com"
Put a email-address here. Dont use your private address. since this is the common address for the Certificate Authority
Save the file
6. Run "vars.bat"
7. Run "clean-all.bat"
8. Run "build-ca.bat". Then you are prompted for some different things; Leave them at default, except "Common Name" - put something like "pfSense-CA"
9. Run "build-key-server.bat server". Again you are prompted; leave them on default except "Common Name" - use "server"
10. Run build-dh.bat
Now its time to generate keys and certificates for the client(s)
11. Run "build-key.bat ovpn_client1". Again you are prompted; leave them on default except "Common Name" - here you should put in "ovpn_client1" (or whatever you have called it). The ovpn_client1 will be the name of the keys, certificate and the name you identify the connection on later. You can use whatever name you like, and generate as many as you want (with different names).
12. The following files should now be copied from c:\programfiles\openvpn\easy-rsa\keys to c:\programfiles\openvpn\config
- ca.crt
- ovpn_client1.key
- ovpn_client1.crt (if you don't see a .crt file but only a .csr file, chances are that you don't have admin privileges. Worst case generate the keys and certificates on a NON-Vista machine)
13. Make a file in the "C:\programfiles\openvpn\config" called "ovpn_client1.ovpn" and the file should contain (leave out the hashes):
client
dev tun
proto udp
remote XXX.XXX.XXX.XXX 1194
ping 10
resolv-retry infinite
nobind
persist-key
persist-tun
ca ca.crt
cert ovpn_client1.crt
key ovpn_client1.key
ns-cert-type server
comp-lzo
pull
verb 3
Replace the XXX's in the "remote" line with the public IP address of your pfSense-box. If you don't know what that is, check it here. If you have chosen another name than 'ovpn_client1' then change it in the lines beginning with 'cert' and 'key' If you have more than one VPN client, you make one .ovpn-file per client (with the corresponding .key and .crt name)
Now its time to configure pfSense
14. Log into the web-gui of pfSense
15. Select VPN/OpenVPN and add an entry in the 'server' page. Use the following settings:
Protocol: UDP
Local port: 1194
Address pool: 192.168.200.0/24 (It should be an address range that you ''DONT'' currently use.)
Local Network: 192.168.1.0/24 (Whatever the network is that you want the VPN client to connect to)
Remote Network: blank
Cryptography: BF-CBC (128 bit) - or use what you want
Authentication Method: PKI
16. Now you need to have access to some of the files created in c:\programfiles\openvpn\easy-rsa\keys (mentioned in 12.)
- Copy the WHOLE content of ca.crt into the "CA certificate" window
- Copy the WHOLE content of server.crt into the "Server Certificate" window
- Copy the WHOLE content of server.key into the "Server Key" window
- Copy the WHOLE content of dh1024.pem into the "DH parameters" window
17. Tick DHCP-Opt: Disable NetBIOS (I dont use it anyway)
18. Tick LZO Compression
Now we need a few simple rules in the firewall
19. On the WAN interface you should make a rule that;
PASS
WAN
Protocol: UDP
source: any
OS type: any
Destination: any
Destination port range from: OpenVPN
Destination port range to: OpenVPN
Tick in the LOG
Leave the rest at default.
Remember to apply the new rules.
20. Add another rule on the LAN interface (or whatever the name of the net defined in 15. 'address pool' is);
PASS
Any protocol
Source: LAN (or whatever the name of the net defined in 15. 'address pool' is)
Any destination
Remember to apply the new rules.
Now you should be able to connect from OpenVPN (right click on the icon in the try and select Connect). But remember to start OpenVPN with ADMIN RIGHTS!
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