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55 lines
2.8 KiB
Plaintext
55 lines
2.8 KiB
Plaintext
2 years ago
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# Fail2Ban filter for exim
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#
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# This includes the rejection messages of exim. For spam and filter
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# related bans use the exim-spam.conf
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#
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[INCLUDES]
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# Read common prefixes. If any customizations available -- read them from
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# exim-common.local
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before = exim-common.conf
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[Definition]
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# Fre-filter via "prefregex" is currently inactive because of too different failure syntax in exim-log (testing needed):
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#prefregex = ^%(pid)s <F-CONTENT>\b(?:\w+ authenticator failed|([\w\-]+ )?SMTP (?:(?:call|connection) from|protocol(?: synchronization)? error)|no MAIL in|(?:%(host_info_pre)s\[[^\]]+\]%(host_info_suf)s(?:sender verify fail|rejected RCPT|dropped|AUTH command))).+</F-CONTENT>$
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failregex = ^%(pid)s %(host_info)ssender verify fail for <\S+>: (?:Unknown user|Unrouteable address|all relevant MX records point to non-existent hosts)\s*$
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^%(pid)s \w+ authenticator failed for (?:[^\[\( ]* )?(?:\(\S*\) )?\[<HOST>\](?::\d+)?(?: I=\[\S+\](:\d+)?)?: 535 Incorrect authentication data( \(set_id=.*\)|: \d+ Time\(s\))?\s*$
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^%(pid)s %(host_info)srejected RCPT [^@]+@\S+: (?:relay not permitted|Sender verify failed|Unknown user|Unrouteable address)\s*$
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^%(pid)s SMTP protocol synchronization error \([^)]*\): rejected (?:connection from|"\S+") %(host_info)s(?:next )?input=".*"\s*$
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^%(pid)s SMTP call from (?:[^\[\( ]* )?%(host_info)sdropped: too many (?:nonmail commands|syntax or protocol errors) \(last (?:command )?was "[^"]*"\)\s*$
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^%(pid)s SMTP protocol error in "[^"]+(?:"+[^"]*(?="))*?" %(host_info)sAUTH command used when not advertised\s*$
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^%(pid)s no MAIL in SMTP connection from (?:[^\[\( ]* )?(?:\(\S*\) )?%(host_info)sD=\d\S*s(?: C=\S*)?\s*$
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^%(pid)s (?:[\w\-]+ )?SMTP connection from (?:[^\[\( ]* )?(?:\(\S*\) )?%(host_info)sclosed by DROP in ACL\s*$
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<mdre-<mode>>
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mdre-aggressive = ^%(pid)s no host name found for IP address <HOST>$
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^%(pid)s no IP address found for host \S+ \(during SMTP connection from \[<HOST>\]\)$
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mdre-normal =
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# Parameter `mode` - `normal` or `aggressive`.
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# Aggressive mode can be used to match flood and ddos-similar log-entries like:
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# 'no host found for IP', 'no IP found for host'.
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# Note this is not an authentication failures, so it may produce lots of false
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# positives on misconfigured MTAs.
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# Ex.:
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# filter = exim[mode=aggressive]
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mode = normal
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ignoreregex =
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# DEV Notes:
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# The %(host_info) defination contains a <HOST> match
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#
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# SMTP protocol synchronization error \([^)]*\) <- This needs to be non-greedy
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# to void capture beyond ")" to avoid a DoS Injection vulnerabilty as input= is
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# user injectable data.
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#
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# Author: Cyril Jaquier
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# Daniel Black (rewrote with strong regexs)
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# Martin O'Neal (added additional regexs to detect authentication failures, protocol errors, and drops)
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