nginx-bad-request.conf

# Fail2Ban filter to match bad requests to nginx
#

[Definition]

# The request often doesn't contain a method, only some encoded garbage
# This will also match requests that are entirely empty
failregex = ^<HOST> - \S+ \[\] "[^"]*" 400

datepattern = {^LN-BEG}%%ExY(?P<_sep>[-/.])%%m(?P=_sep)%%d[T ]%%H:%%M:%%S(?:[.,]%%f)?(?:\s*%%z)?
              ^[^\[]*\[({DATE})
              {^LN-BEG}

# Author: Jan Przybylak