fail to ban

Yannick Champs

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Aug 11, 2026, 4:53:05 PM (8 days ago) Aug 11

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Hello All,

is there a way to ban a tacacs user after X failed password attempts for Y minutes ?

When the user is banned we also have a syslog message send to a syslog server, possible ?

Regards

Marc Huber

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Aug 12, 2026, 1:09:26 PM (7 days ago) Aug 12

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Hi Yannick,

the "tacauth_limit" module implements blocking users based on failed authentication attempts for MAVIS-authenticated users. It's documented in https://projects.pro-bono-publico.de/event-driven-servers/doc/mavis.html#AEN796 (but I'm no sure whether that bookmark pointer will be valid after any update).

Syslog notifications aren't implemented, but propagating the blacklisting status back for reporting is a sane idea, I'm looking into that.

Cheers,

Marc

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Marc Huber

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Aug 13, 2026, 1:17:22 PM (6 days ago) Aug 13

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Hi Yannick,

I've had some more thoughts about the logging part. You can easily configure this with a suitable syslog filter that checks the user message set by tacauth_limit, e.g.:

script logfilter {
if ("${umessage}" =~ /\(banned for another /) permit
deny
}
log authenlog {
destination = syslog
filter = logfilter
}
authentication log = authenlog

Cheers,

Marc

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