Poptop MSCHAP2 ADS Howto

A6. Configure Freeradius for MSCHAPv2 on Fedora 4 / 5 / 6
(last update: 19 May 2007)

Edit /etc/raddb/radiusd.conf to enable MSCAHP2. Open the file and locate the module section and then the mschap subsection.

>     modules {

>             ....[snip]....

>             mschap {
>                     authtype = MS-CHAP
>                     use_mppe = yes
>                     require_encryption = yes
>                     require_strong = yes
>                     ntlm_auth = "/usr/bin/ntlm_auth --request-nt-key --username=%{Stripped-User-Name:-%{User-Name:-None}} --challenge=%{mschap:Challenge:-00} --nt-response=%{mschap:NT-Response:-00}"
>             }

>             ....[snip]....

>     }

The mschap option in the authorize and authenticate sections is enabled by default. If they are not, enable them accordingly. Save the file.

The radius server has a secret key for security. The default key for freeradius is testing123. It is a good idea to change it for obvious security reasons. The key is in /etc/raddb/clients.conf.

>     client 127.0.0.1 {
>             #
>             #  The shared secret use to "encrypt" and "sign" packets between
>             #  the NAS and FreeRADIUS.  You MUST change this secret from the
>             #  default, otherwise it's not a secret any more!
>             #
>             #  The secret can be any string, up to 32 characters in length.
>             #
>             secret          = testing123

>             ....[snip]....

Note: if you change the secret key, you must modify the /etc/radiusclient/servers so that they match each other.

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