[Freeipa-devel] global account lockout
rcritten at redhat.com
Mon Apr 7 15:26:26 UTC 2014
Ludwig Krispenz wrote:
> please review the following feature design. It introduces a global
> account lockout, while trying to keep the replication traffic minimal.
> In my opinion for a real global account lockout the basic lockout
> attributes have to be replicated otherwise the benefit is minimal: an
> attacker could perform (maxFailedcount -1) login attempts on every
> server before the global lockout is set. But the design page describes
> how it could be done if it should be implemented - maybe the side effect
> that accounts could the be unlocked on any replica has its own benefit.
One weakness with this is there is still a window for extra password
attempts if one is clever, (m * (f-1))+1 to be exact, where m is the
number of masters and f is the # of allowed failed logins.
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