On 13.5.2016 15:25, Thomas Heil wrote:
> Hi,
> I would like to reduce the vector of brute force attacks in my web
> application written in php. Users can login via passord and otp which
> are hosted on freeipa.
> To achieve this I would like to check the otp first, so no password auth
> is done on the freeipa server and no user can be locked out.
> If the otp is correct, the user is now allowed to to login via password+otp.
> unfortunately, there is no api method that can check only the otp for a
> user with an  identity.
> Would it be possible to expose such a new method?

This would open a new attack vector so it is a bad idea.

Attacker must not be able to distinguish case where password OR OTP is
correct/wrong. If you allow this, the attacker will be able to crack OTP first
and then continue with password, so you are making it easier.

Do not do that :-)

Petr^2 Spacek

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