Google Authenticator on pfSense

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This article explains how to set up OpenVPN with Google Authenticator on pfSense.

Set up the FreeRADIUS

  • Go to System > Package Manager > Available Packages and install FreeRADIUS package.
  • Services > FreeRADIUS > Interfaces > Add
Interface IP Address 127.0.0.1
Port 1812
Interface Type Authentication
IP Version IPv4
Description Authentication

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Interface IP Address 127.0.0.1
Port 1813
Interface Type Authentication
IP Version IPv4
Description Accounting

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Add a NAS client

  • Services > FreeRADIUS > NAS/Clients > Add
Client IP Address 127.0.0.1
Client IP Version IPv4
Client Shortname pfsenselocal
Client Shared Secret Password1
Client Protocol UDP
Client Type other
Require Message Authenticator No
Max Connections 16
Description pfsenselocal

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Add an authentication server ro pfSense

  • System > User Manager > Authentication Servers > Add
Descriptive Name localfreeradius
Type RADIUS
Protocol PAP
Hostname or IP address 127.0.0.1
Shared Secret Password1
Services offered Authentication and Accounting
Authentiocation port 1812
Accounting port 1813
Authentication Timeout 5
RADIUS NAS IP Attribute LAN

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Configurate OTP for Users

  • Services > FreeRADIUS > Users > Add
Username tester
Password
Password Encryption Cleartext-Password
One-Time Password Enable One-Time Password (OTP) for this user
OTP Auth Method Google-Authenticator
Init-Secret click Generator OTP Secret
PIN enter 4-8 numbers and remember them.
QR Code click Generate QR Code.

At this point open Google Authenticator on your phone and scan the QRCODE.

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You can use One-Time Password (OTP) only for local FreeRadius users. FreeRadius users from diferent backenl like mysql or ldap did not work.

Configurate openvpn

  • Go to VPN > OpenVPN > Servers > Edit
  • Select localfreeradius for Backend for authentication

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  • In the OpenVPN Server configuration, under Advanced Configuration > Custom options
  • add: reneg-sec 0

If you connect your OpenVPN client you must enter your username and the PIN + the Google Authenticator one-time code as your password.
If PIN is 1234 and the Google Authenticator code is 445 745 then the password is: 1234445745

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