MSCHAPv2 Module with Stripped-Username - no ActiveDirectory

[Markus Maurer]

I got this working on an other system which is bound to an active directory. The only difference is that I‘m using ntlm_auth in the eap module and in the ntlm_auth command I can use the stripped-username attribute. How it works?
The first step: check *only* the otp over rlm_perl.
If this success:
The second step: exec the eap module and use ntlm_auth with the stripped-username.



> Am 11.11.2018 um 17:46 schrieb Alan DeKok <aland at deployingradius.com>:
> 
>> On Nov 11, 2018, at 10:57 AM, Markus Maurer <lists at v-net.tk> wrote:
>> 
>> The problem is that the user is stored in database as following: <username> <password>
>> And the request comes with <username>:<otp> <password>.
>> So I have to strip the username to verify against the database. I just need something to use eap mschapv2 with a stripped-username or a an external program like ntlm_auth without AD binding which could be executed in the eap module
> 
>  You can't strip the User-Name and expect that ntlm_auth will work.  Again, the MS-CHAP calculations are done on the full username as supplied by the user.  Which in this case, includes the OTP.
> 
>  Since AD works on the *real name*, and not the *name with the OTP*, you can't pass both the real name and the one with the OTP, to ntlm_auth.  ntlm_and and AD don't support that use-case.
> 
>  What you want to do is impossible.
> 
>  If the users name and password is in SQL, then it's possible.  Look up the user in SQL based on the Stripped-User-Name (which is the default).  And, do the MS-CHAP calculations based on the real User-Name (which is also the default).
> 
>  And *don't* modify the User-Name attribute.
> 
>  Alan DeKok.
> 
> 
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