Installation description
In our case, the Freeradius aims to authenticate a remote access on network equipment. I have decided to use an existing database (Active directory).
FreeRadius paquets installations:
apt-get install freeradius
apt-get install freeradius-utils
apt-get install freeradius-ldap
Configure the radiusd.conf file
Modify the file radiusd.conf (/etc/freeradius/radiusd.conf) in order to specify the listen ports:
- Authentification (2050)
- Accounting (2051)
listen {
type = auth
ipaddr = *
port = 2050
}
listen {
ipaddr = *
port = 2051
type = acct
}
Uncomment the following lines in order to have more details in logs messages:
msg_goodpass = "Host %n"
msg_badpass = "Host %n"
Configure the Users file
Modify the file users (/etc/freeradius/users) .
This file includes users which are authorized to take control on 'client' (network equipment for us).
- We can use a local database:
Username Cleartext-Password := "Password"
Service-Type = NAS-Prompt-User,
Cisco-AVPair = "shell:priv-lvl=15"
- Or an external database. In this example, only members of groups 'Group_Network_Admin' (Active Directory) are authorized to access:
DEFAULT LDAP-Group == "Group_Network_Admin"
Service-Type = Administrative-User,
Cisco-AVPair = "shell:priv-lvl=15"
DEFAULT LDAP-Group != "Group_Network_Admin", Auth-Type := Reject
Enable authentication via LDAP:
Modify the file ldap (/etc/freeradius/sites-enabled/ default) by uncommenting the following lines :
ldap
Auth-Type LDAP {
ldap
}
Create clients of the radius server
Modify the file users (/etc/freeradius/users). Clients are hosts which forward request of authentication to the radius server (ex: Cisco switch).
In the example below, I have added a complete subnet. All hosts in this subnet are authorized to send request.
We also defined the share key in this file:
client 10.110.22.0/24 {
secret = SharedKey
nastype = cisco
shortname = SWITCH-Branch-London
}
Configure request to Active Directory
Modify the file ldap (/etc/freeradius/modules/ldap). You will find below an example of configuration :
ldap {
server = 'ldap://mydomain.com'
identity = "Username@mydomain.com"
password = "Password"
basedn = "DC=mydomain,DC=com"
filter = "(sAMAccountName=%{%{Stripped-User-Name}:-%{User-Name}})"
groupname_attribute = cn
groupmembership_attribute = "memberOf"
Uncomment the following lines:
chase_referrals = yes
rebind = yes
