Unix Server Tech Knowledge Base

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====== opnSense Road Warrior ======

  - Create a Certificate of Authority (hint, use an existing one if you want)
     - System | Trust | Authorities
     - Add and select Create Internal
        - Name - System CA (or something)
        - Lifetime - 3650 (10 years)
        - Fill in rest of stuff
        - Click Save
  - Set up local authentication
     - System | Settings | Administration | Server = Local Database
  - Create a Server Certificate (recommend you create a new one)
     - System | Trust | Certificates
     -  Add and select Create Internal
        - Descriptive Name -  VPN Road Warrior Server Certificate
        - Certificate authority - Select System CA
        - Type Server Certificate
        - Lifetime - 3650 (10 years)
        - Common Name - roadwarriorservercert
  - Server Settings.
     - VPN | Open VPN | Servers
     - Use wizard to create
     - Type of Server - Local User Access
     - Certificate Authority - System CA
     - Server Certificate - VPN Road Warrior Server Certificate
     - General Settings
        - Interface - WAN
        - Protocol - UDP
        - Local Port - Choose one around 1190 which is not used by something else
        - Description - Road Warrior
     - Cryptographic Settings - I just leave them at default
     - Tunnel Settings
        - IPv4 Tunnel Network - any subnet defined for private use (ie, 10., 172., 192)
        - IPV6 Tunnel Network - I don't use
        - Redirect Gateway - check if you want all traffic to be forced through the tunnel. More secure, but uses more bandwidth
        - IPv4 Local Network - the subnet on your LAN
        - Concurrent Connections - maximum number of simultaneous VPN connections allowed at one time (all users)
        - Inter-Client Communication - Check if you want VPN users to "see" each other
        - Duplicate Connections - Check if you want one user to be able to use the same settings simultaneously on different computers
        - I generally leave the rest of it alone; you can change it later if you want.
     - Firewall Rule Configuration
        - Check the first box to get it to automagically create the firewall rules to allow VPN connections
           - After creation, you can go to Firewall | Rules | WAN and see the rule to allow entry
           - You can also go to Firewall | Rules | OpenVPN to see the rule to allow traffic after the connection is created
        - Check the second if you want users to be forced to pass all traffic through the VPN connection
  - System | Access | Groups (optional, allows RoadWarriors to change their passwords)
  - Add
     - Group Name - Road Warrior
     - Description - Road Warrior Users
     - Save
     - Edit
     - Assign Privileges (hint, use the filter
        - Lobby: Login / Logout / Dashboard
        - GUI: System:User Password Manager
  - System | Access | Users
     - Add
        - Username - I use all lower case, no special chars (including spaces)
        - Password - Put in a good password (user can change it is if you set up the group)
        - If the user should be able to log in from the cli or ssh, change login shell
        - Expiration Date - Leave blank to not expire
        - Group Memberships - RoadWarrior
        - Certificate - Click to create a user certificate
        - Save, it will go to the Create a Certificate page
        - Method - Create an internal certificate
        - Lifetime
           - 3650 = 10 years, or whatever you want
           - When the Cert expires, user will no longer be able to use VPN and you must generate a new cert
        - Change the stuff below if you want; the default is usually sufficient
        - Click Save, you will return to the User screen for that user
        - Add an SSH authorized_keys file (with public ssh key) if you want.
  - VPN | OpenVPN | Client Export
    - Change Remote Access Server if you have more than one and want to select one
    - Host Name Resolution - choose how the client knows what to connect to
      - Since I try to set up my firewalls using a DNS name as it's name, I usually select "installation hostname"
      - If you have a static IP, you can use the Interface IP Address
      - If you need to manually put something in, choose "Other"
    - You can protect the certificate with a password by checking Use a password to protect pkcs12 file. Users will have to use that password, then use their username/password to make a connection
    - For each user, select Export type. "Others" fits about anyplace and is a single file, but if you are using Viscosity, or are using on a tablet/phone, use one of the specific options.



===== Links =====
  * [[https://www.kirkg.us/posts/building-an-openvpn-server-with-opnsense/]]
  * [[https://doc.pfsense.org/index.php/OpenVPN_Remote_Access_Server]]