Access Challenge in freeRadius server

kpani dhandu_k at
Mon Jun 15 14:43:22 CEST 2009

Thanks Ivan for the clarification. I am just setting up the tool eapol_test
to test it. Thanks.

But I am also investigating whether it is possible to achieve Access
Challenge with ssh/telnet without using any other tools. Could you please
help if you have done it before?

And also may I know why it is not advised to support Access Challenge for
ssh or telnet.


Ivan Kalik wrote:
>> I am trying to authorize the ssh and telnet login users of my Redhat
>> Linux
>> machine using freeRadius server.
>> I am able to test Access-Accept and Access-Reject with right and wrong
>> credentials respectively by configuring the file '/etc/pam.d/sshd' with
>> entry
>> But I do not know how to achieve and test the Access-Challenge concept.
> Do you need to? ssh and telnet supplicants tend not to use protocols with
> challenge-response exchange.
>> I
>> mean what type of input will result in Access Challenge (I know it
>> happens
>> when we provide partial login information but not sure how to achieve
>> with
>> login in real time)?
> Send an eap request (eapol_test).
> Ivan Kalik
> Kalik Informatika ISP
> -
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