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# Fail2Ban filter for selected Postfix SMTP rejections
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#
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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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# common.local
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before = common.conf
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[Definition]
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_daemon = postfix(-\w+)?/\w+(?:/smtp[ds])?
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_port = (?::\d+)?
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prefregex = ^%(__prefix_line)s<mdpr-<mode>> <F-CONTENT>.+</F-CONTENT>$
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mdpr-normal = (?:\w+: reject:|(?:improper command pipelining|too many errors) after \S+)
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mdre-normal=^RCPT from [^[]*\[<HOST>\]%(_port)s: 55[04] 5\.7\.1\s
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^RCPT from [^[]*\[<HOST>\]%(_port)s: 45[04] 4\.7\.\d+ (?:Service unavailable\b|Client host rejected: cannot find your (reverse )?hostname\b)
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^RCPT from [^[]*\[<HOST>\]%(_port)s: 450 4\.7\.\d+ (<[^>]*>)?: Helo command rejected: Host not found\b
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^EHLO from [^[]*\[<HOST>\]%(_port)s: 504 5\.5\.\d+ (<[^>]*>)?: Helo command rejected: need fully-qualified hostname\b
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^(RCPT|VRFY) from [^[]*\[<HOST>\]%(_port)s: 550 5\.1\.1\s
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^RCPT from [^[]*\[<HOST>\]%(_port)s: 450 4\.1\.\d+ (<[^>]*>)?: Sender address rejected: Domain not found\b
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^from [^[]*\[<HOST>\]%(_port)s:?
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mdpr-auth = warning:
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mdre-auth = ^[^[]*\[<HOST>\]%(_port)s: SASL ((?i)LOGIN|PLAIN|(?:CRAM|DIGEST)-MD5) authentication failed:(?! Connection lost to authentication server| Invalid authentication mechanism)
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mdre-auth2= ^[^[]*\[<HOST>\]%(_port)s: SASL ((?i)LOGIN|PLAIN|(?:CRAM|DIGEST)-MD5) authentication failed:(?! Connection lost to authentication server)
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# todo: check/remove "Invalid authentication mechanism" from ignore list, if gh-1243 will get finished (see gh-1297).
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# Mode "rbl" currently included in mode "normal", but if needed for jail "postfix-rbl" only:
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mdpr-rbl = %(mdpr-normal)s
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mdre-rbl = ^RCPT from [^[]*\[<HOST>\]%(_port)s: [45]54 [45]\.7\.1 Service unavailable; Client host \[\S+\] blocked\b
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# Mode "rbl" currently included in mode "normal" (within 1st rule)
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mdpr-more = %(mdpr-normal)s
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mdre-more = %(mdre-normal)s
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mdpr-ddos = lost connection after(?! DATA) [A-Z]+
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mdre-ddos = ^from [^[]*\[<HOST>\]%(_port)s:?
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mdpr-extra = (?:%(mdpr-auth)s|%(mdpr-normal)s)
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mdre-extra = %(mdre-auth)s
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%(mdre-normal)s
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mdpr-aggressive = (?:%(mdpr-auth)s|%(mdpr-normal)s|%(mdpr-ddos)s)
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mdre-aggressive = %(mdre-auth2)s
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%(mdre-normal)s
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mdpr-errors = too many errors after \S+
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mdre-errors = ^from [^[]*\[<HOST>\]%(_port)s$
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failregex = <mdre-<mode>>
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# Parameter "mode": more (default combines normal and rbl), auth, normal, rbl, ddos, extra or aggressive (combines all)
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# Usage example (for jail.local):
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# [postfix]
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# mode = aggressive
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#
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# # or another jail (rewrite filter parameters of jail):
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# [postfix-rbl]
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# filter = postfix[mode=rbl]
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#
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# # jail to match "too many errors", related postconf `smtpd_hard_error_limit`:
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# # (normally included in other modes (normal, more, extra, aggressive), but this jail'd allow to ban on the first message)
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# [postfix-many-errors]
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# filter = postfix[mode=errors]
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# maxretry = 1
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#
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mode = more
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ignoreregex =
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[Init]
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journalmatch = _SYSTEMD_UNIT=postfix.service
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# Author: Cyril Jaquier
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