/etc/fail2ban/filter.d/proftpd.conf is in fail2ban 0.8.11-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | # Fail2Ban fitler for the Proftpd FTP daemon
#
[INCLUDES]
before = common.conf
[Definition]
_daemon = proftpd
__suffix_failed_login = (User not authorized for login|No such user found|Incorrect password|Password expired|Account disabled|Invalid shell: '\S+'|User in \S+|Limit (access|configuration) denies login|Not a UserAlias|maximum login length exceeded).?
failregex = ^%(__prefix_line)s%(__hostname)s \(\S+\[<HOST>\]\)[: -]+ USER .*: no such user found from \S+ \[\S+\] to \S+:\S+ *$
^%(__prefix_line)s%(__hostname)s \(\S+\[<HOST>\]\)[: -]+ USER .* \(Login failed\): %(__suffix_failed_login)s\s*$
^%(__prefix_line)s%(__hostname)s \(\S+\[<HOST>\]\)[: -]+ SECURITY VIOLATION: .* login attempted\. *$
^%(__prefix_line)s%(__hostname)s \(\S+\[<HOST>\]\)[: -]+ Maximum login attempts \(\d+\) exceeded *$
ignoreregex =
# Author: Yaroslav Halchenko
# Daniel Black - hardening of regex
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