One Hat Cyber Team

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Server: Linux managedhosting.chostar.me 5.15.0-160-generic #170-Ubuntu SMP Wed Oct 1 10:06:56 UTC 2025 x86_64
Server Software: Apache
PHP Version: 8.1.33
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View File Name : sendmail-auth.conf

# Fail2Ban filter for sendmail authentication failures
#

[INCLUDES]

before = common.conf

[Definition]

_daemon = (?:sendmail|sm-(?:mta|acceptingconnections))
# "\w{14,20}" will give support for IDs from 14 up to 20 characters long
__prefix_line = %(known/__prefix_line)s(?:\w{14,20}: )?
addr = (?:IPv6:<IP6>|<IP4>)

prefregex = ^<F-MLFID>%(__prefix_line)s</F-MLFID><F-CONTENT>.+</F-CONTENT>$

failregex = ^(\S+ )?\[%(addr)s\]( \(may be forged\))?: possible SMTP attack: command=AUTH, count=\d+$
            ^AUTH failure \(LOGIN\):(?: [^:]+:)? authentication failure: checkpass failed, user=<F-USER>(?:\S+|.*?)</F-USER>, relay=(?:\S+ )?\[%(addr)s\](?: \(may be forged\))?$
ignoreregex =

journalmatch = _SYSTEMD_UNIT=sendmail.service

# DEV Notes:
#
# Author: Daniel Black