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51 lines
2.4 KiB
51 lines
2.4 KiB
# Fail2Ban filter for sendmail spam/relay type failures
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#
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# Some of the below failregex will only work properly, when the following
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# options are set in the .mc file (see your Sendmail documentation on how
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# to modify it and generate the corresponding .cf file):
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#
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# FEATURE(`delay_checks')
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# FEATURE(`greet_pause', `500')
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# FEATURE(`ratecontrol', `nodelay', `terminate')
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# FEATURE(`conncontrol', `nodelay', `terminate')
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#
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# ratecontrol and conncontrol also need corresponding options ClientRate:
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# and ClientConn: in the access file, see documentation for ratecontrol and
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# conncontrol in the sendmail/cf/README file.
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[INCLUDES]
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before = common.conf
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[Definition]
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_daemon = (?:(sm-(mta|acceptingconnections)|sendmail))
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failregex = ^%(__prefix_line)s\w{14}: ruleset=check_rcpt, arg1=(?P<email><\S+@\S+>), relay=(\S+ )?\[<HOST>\]( \(may be forged\))?, reject=(550 5\.7\.1 (?P=email)\.\.\. Relaying denied\. (IP name possibly forged \[(\d+\.){3}\d+\]|Proper authentication required\.|IP name lookup failed \[(\d+\.){3}\d+\])|553 5\.1\.8 (?P=email)\.\.\. Domain of sender address \S+ does not exist|550 5\.[71]\.1 (?P=email)\.\.\. (Rejected: .*|User unknown))$
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^%(__prefix_line)sruleset=check_relay, arg1=(?P<dom>\S+), arg2=<HOST>, relay=((?P=dom) )?\[(\d+\.){3}\d+\]( \(may be forged\))?, reject=421 4\.3\.2 (Connection rate limit exceeded\.|Too many open connections\.)$
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^%(__prefix_line)s\w{14}: rejecting commands from (\S* )?\[<HOST>\] due to pre-greeting traffic after \d+ seconds$
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^%(__prefix_line)s\w{14}: (\S+ )?\[<HOST>\]: ((?i)expn|vrfy) \S+ \[rejected\]$
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^(?P<__prefix>%(__prefix_line)s\w+: )<[^@]+@[^>]+>\.\.\. No such user here<SKIPLINES>(?P=__prefix)from=<[^@]+@[^>]+>, size=\d+, class=\d+, nrcpts=\d+, bodytype=\w+, proto=E?SMTP, daemon=MTA, relay=\S+ \[<HOST>\]$
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ignoreregex =
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[Init]
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# "maxlines" is number of log lines to buffer for multi-line regex searches
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maxlines = 10
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# DEV NOTES:
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#
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# Regarding the last multiline regex:
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#
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# There can be a nunber of non-related lines between the first and second part
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# of this regex maxlines of 10 is quite generious. Only one of the
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# "No such user" lines needs to be matched before the line with the HOST.
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#
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# Note the capture __prefix, includes both the __prefix_lines (which includes
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# the sendmail PID), but also the \w+ which the the sendmail assigned mail ID.
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#
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# Author: Daniel Black and Fabian Wenk
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