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# Fail2Ban filter for openssh
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#
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[INCLUDES]
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# Read common prefixes. If any customizations available -- read them from
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# common.local
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before = common.conf
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[Definition]
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_daemon = sshd
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failregex = ^%(__prefix_line)s(?:error: PAM: )?[aA]uthentication (?:failure|error) for .* from <HOST>( via \S+)?\s*$
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^%(__prefix_line)s(?:error: PAM: )?User not known to the underlying authentication module for .* from <HOST>\s*$
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^%(__prefix_line)sFailed \S+ for .*? from <HOST>(?: port \d*)?(?: ssh\d*)?(: (ruser .*|(\S+ ID \S+ \(serial \d+\) CA )?\S+ %(__md5hex)s(, client user ".*", client host ".*")?))?\s*$
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^%(__prefix_line)sROOT LOGIN REFUSED.* FROM <HOST>\s*$
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^%(__prefix_line)s[iI](?:llegal|nvalid) user .* from <HOST>\s*$
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^%(__prefix_line)sUser .+ from <HOST> not allowed because not listed in AllowUsers\s*$
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^%(__prefix_line)sUser .+ from <HOST> not allowed because listed in DenyUsers\s*$
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^%(__prefix_line)sUser .+ from <HOST> not allowed because not in any group\s*$
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^%(__prefix_line)srefused connect from \S+ \(<HOST>\)\s*$
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^%(__prefix_line)sUser .+ from <HOST> not allowed because a group is listed in DenyGroups\s*$
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^%(__prefix_line)sUser .+ from <HOST> not allowed because none of user's groups are listed in AllowGroups\s*$
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ignoreregex =
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# DEV Notes:
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#
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# "Failed \S+ for .*? from <HOST>..." failregex uses non-greedy catch-all because
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# it is coming before use of <HOST> which is not hard-anchored at the end as well,
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# and later catch-all's could contain user-provided input, which need to be greedily
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# matched away first.
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#
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# Author: Cyril Jaquier, Yaroslav Halchenko, Petr Voralek, Daniel Black
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