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26 lines
776 B
26 lines
776 B
2 years ago
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# Fail2Ban filter for sendmail authentication failures
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#
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[INCLUDES]
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before = common.conf
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[Definition]
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_daemon = (?:sendmail|sm-(?:mta|acceptingconnections))
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# "\w{14,20}" will give support for IDs from 14 up to 20 characters long
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__prefix_line = %(known/__prefix_line)s(?:\w{14,20}: )?
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addr = (?:IPv6:<IP6>|<IP4>)
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prefregex = ^<F-MLFID>%(__prefix_line)s</F-MLFID><F-CONTENT>.+</F-CONTENT>$
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failregex = ^(\S+ )?\[%(addr)s\]( \(may be forged\))?: possible SMTP attack: command=AUTH, count=\d+$
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^AUTH failure \(LOGIN\):(?: [^:]+:)? authentication failure: checkpass failed, user=<F-USER>(?:\S+|.*?)</F-USER>, relay=(?:\S+ )?\[%(addr)s\](?: \(may be forged\))?$
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ignoreregex =
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journalmatch = _SYSTEMD_UNIT=sendmail.service
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# DEV Notes:
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#
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# Author: Daniel Black
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