Configuring PEAP authentication with FreeRADIUS

PEAP (Protected Extensible Authentication Protocol) is an authentication method based in two simple steps:

  1. The client establishes a TLS session with the server.

  2. The server authenticates the client over the same digital certified with a RADIUS server.

This allows EAP use insecure authentication protocols like MS-CHAP v2 (Microsoft version of CHAP used in this tutorial because is the default type supported by windows clients) with a secure tunnel.

RADIUS (Remote Authentication Dial In User Service) is a network protocol that provides Authentication, Authorization and Accounting to connect network services.

I’ll configure a simple scenario with an access point authenticating the wireless access with FreeRADIUS:

Image

Configuring FreeRADIUS
1.- Install freeradius:

# apt-get install freeradius
2.- Edit EAP method:

# vi /etc/freeradius/eap.conf:
default_eap_type = peap

3.- Adding new users :

# vi /etc/freeradius/users
tuxuser Cleartext-Password := "P@sswd4Tux"
tuxadmin Cleartext-Password := "P@sswrd4Admin"

4.- Enabling and configuring mschap-v2 protocol:

# vi /etc/freeradius/modules/mschap
use_mppe = yes
require_encryption = yes
require_strong = yes
with_ntdomain_hack = yes

5.- Reloading new libraries:

# ldconfig
6.- Add new radius clients (Access point):

# vi /etc/freeradius/clients.conf
client 192.168.1.2/24 {
secret = 0peN2d0!
shortname = Linksys WRT160NL
}
7.- Restarting service and testing radius authentication:

# service freeradius restart

# radtest tuxuser P@sswd4Tux 192.168.1.10 1812 0peN2d0!

Configuring Access Point:
Image
Configuring the client (Android based phone):
ImageImage
Official page of FreeRADIUS project:
http://freeradius.org/

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