captive portal auth with freeradius

Matthew Newton mcn4 at
Fri Apr 19 18:26:28 CEST 2013

On Fri, Apr 19, 2013 at 08:59:57PM +0530, Chitrang Srivastava wrote:
> I am using Microsoft 2003 Active Directory Server , the way wifi (MSCHAPv2)
> works is with ntlm_auth , which does the authentication.

OK, finally the information that's needed.

> The way it works with wifi or radtest is , Auth-Type is set to EAP (it
> refers to eap.conf ) , it goes to mschap modules(set up TLS channel and
> then under that) , from there its told to use external program ntlm_auth ,
> which does the authentication and tells radius if its OK or not.
> What i was trying , is to get similar way working with captive portal as
> well.

There's an example in raddb/modules/ntlm_auth. Configure that
file, and then do something like this:

authorize {
   if (!EAP-Message && User-Password) {
     update control {                 
       Auth-Type = PAP

authenticate {
  Auth-Type PAP {
    # pap <-- comment out

Then it should take your User-Name and User-Password, check them
using the ntlm_auth utility rather than the pap module (the
ntlm_auth "module" is just an instantiation of exec).


Matthew Newton, Ph.D. <mcn4 at>

Systems Specialist, Infrastructure Services,
I.T. Services, University of Leicester, Leicester LE1 7RH, United Kingdom

For IT help contact helpdesk extn. 2253, <ithelp at>

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