MSCHAPv2 Module with Stripped-Username - no ActiveDirectory

Alan DeKok aland at
Sun Nov 11 17:46:44 CET 2018

On Nov 11, 2018, at 10:57 AM, Markus Maurer <lists at> 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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