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I am searching for a way to configure some sort of back-off or wait time during failed authentication attempts. The idea is that after each failed authentication attempt, the user has to wait an increasing amount of time:

1. attempt > 5s back-off time > 2. attempts > 10s back-off time > 3. attempts > 15s back-off time > 4. attempt > user blocked

I was having a look at Red Hat's security guide and various PAM modules but couldn't find a suitable parameter.

Does anybody know how to configure such a feature?

  • Are we talking local authentication (like sudo) or remote authentication (ssh) here? – Panki Aug 27 '19 at 13:01
  • Local authentication primarily. But I would be interested in remote solutions as well. – user1192748 Aug 28 '19 at 7:50
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    A remote solution would be fail2ban – Panki Aug 28 '19 at 8:57

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