# fail2ban filter configuration for nginx

[DEFAULT]
# Type of log-file resp. log-format (file, short, journal, rfc5424):
logtype = file

[lt_file]
__prefix_line = \s*

[lt_short]
__prefix_line = \s*(?:(?!\[)\S+ nginx\[\d+\]: [^\[]*)?

[lt_journal]
__prefix_line = %(lt_short/__prefix_line)s


[Definition]

mode = normal

__prefix_line = <lt_<logtype>/__prefix_line>

mdre-auth = ^%(__prefix_line)s\[error\] \d+#\d+: \*\d+ user "(?:[^"]+|.*?)":? (?:password mismatch|was not found in "[^\"]*"), client: <HOST>, server: \S*, request: "\S+ \S+ HTTP/\d+\.\d+", host: "\S+"(?:, referrer: "\S+")?\s*$
mdre-fallback = ^%(__prefix_line)s\[crit\] \d+#\d+: \*\d+ SSL_do_handshake\(\) failed \(SSL: error:\S+(?: \S+){1,3} too (?:long|short)\)[^,]*, client: <HOST>

mdre-normal = %(mdre-auth)s
mdre-aggressive = %(mdre-auth)s
                  %(mdre-fallback)s

failregex = <mdre-<mode>>

ignoreregex = 

datepattern = {^LN-BEG}

journalmatch = _SYSTEMD_UNIT=nginx.service + _COMM=nginx

# DEV NOTES:
# mdre-auth:
# Based on samples in https://github.com/fail2ban/fail2ban/pull/43/files
# Extensive search of all nginx auth failures not done yet.
# 
# Author: Daniel Black

# mdre-fallback:
# Ban people checking for TLS_FALLBACK_SCSV repeatedly
# https://stackoverflow.com/questions/28010492/nginx-critical-error-with-ssl-handshaking/28010608#28010608
# Author: Stephan Orlowsky