Reject authentication attempts based on "cli" value?

[markcapelle at pcmc.com]

It is a Cisco WLAN 4402.  For reference, here is a log entry from a user
connecting from the Guest network:

   Thu Mar 15 07:10:52 2007 : Auth: Login OK: [guestuser] (from client
PCMCWLANCTRLR1 port 0 cli 192.168.100.101)

And here is a log entry from someone connecting via 802.1x on another
network:

   Thu Mar 15 07:26:36 2007 : Auth: Login OK: [DOMAIN\\guestuser] (from
client PCMCWLANCTRLR1 port 1 cli 00-12-F0-19-6E-B3)

As you can see the only way I have to differentiate these two auth attempts
is via the "cli" value.  192.168.100.x is the subnet range of my Guest
network.  I want all auth attempts from 192.168.100.x to be rejected.

Hope someone can help me out with this.

Thanks.

>Date: Thu, 15 Mar 2007 10:55:55 -0400
>From: "King, Michael" <MKing at bridgew.edu>
>Subject: RE:
>To: "FreeRadius users mailing list"
>     <freeradius-users at lists.freeradius.org>
>Message-ID:
>     <6641F169E241EA40B29DE7BFAD24674DA7A43B at EXCH2.campus.bridgew.edu>
>Content-Type: text/plain;    charset="iso-8859-1"
>
>What manufacturer makes the NAS (the wireless controller?)
>
>I would look to the Called-Station field.  Usually (Based on Cisco AP's)
this is the MAC of the AP, followed by the SSID they connected to.
>
>> -----Original Message-----
>> From:
>> freeradius-users-bounces+mking=bridgew.edu at lists.freeradius.or
>> g
>> [mailto:freeradius-users-bounces+mking=bridgew.edu at lists.freer
>> adius.org] On Behalf Of markcapelle at pcmc.com
>> Sent: Thursday, March 15, 2007 10:48 AM
>> To: freeradius-users at lists.freeradius.org
>> Subject:
>>
>> I have a situation where I have a wireless controller that services
>> multiple wireless networks (vlans).? When the controller contacts the
>> RADIUS server with an authentication request, it does so with the IP
>> address of the controller as the client address.? The problem is I
>> have a guest network that has lower security than my other wireless
>> networks.? The guest network has it's own user/password database
>> stored in the controller, but the way authentication occurs is that it
>> checks RADIUS for the user first and assumes it will fail, then will
>> use the internal database.? The issue with this is that if one of my
>> users jumps on the guest network, they are authenticated which is not
>> what I want to happen.? Looking at the logs, I noticed that all the
>> guest network users have the IP address of the client in the "cli"
>> field.? My guest network is a totally different VLAN and IP subnet.
>>
>> Is there a way to key off of the "cli" field and then make it so that
>> all requests from clients with a specific subnet in this field are not
>> authenticated?? This would stop my internal users from connecting, but
>> allow the correct users (those in the internal DB) to still get
>> connected.
>>
>> Thanks.
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