Nicolas Williams wrote:
> On Mon, Dec 10, 2007 at 08:32:57PM -0500, Yu, Ming wrote:
>> But I am still not clear how to "lock out" account after n-times of
>> failed login.
>> Are you saying there is no way to do it in current version of MIT
>> kerberos?

> I'm saying that the MIT and Solaris KDCs do not support that feature.
> BUT, you can write a script to "scrape" (i.e., tail) the KDC log files,
> keep a per-principal count of failed logins, and disable principals with
> too many consecutive failed logins.
> Doug's comment about /etc/passwd was about how you might lock out an
> account that you know you want to lock out, but Doug should really have
> told you to either disable the principal[*] or to use the passwd(1)
> command with the -l option.

I said we use Windows AD for the KDCs and it does lockout a principal after
N attempts, and can unlock them after M minutes too. So this has not been
an issue for us.

>[*] Disabling the principal will cause the account to be locked IF AND
> ONLY IF Kerberos V is the only way to authenticate the account
> (e.g., because the passwd field of the account is "NP", as Doug
> suggests).


Douglas E. Engert
Argonne National Laboratory
9700 South Cass Avenue
Argonne, Illinois 60439
(630) 252-5444