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# junkfilter
# a junk email filter system for procmail
# Copyright 1997-2002 Gregory Sutter <gsutter@zer0.org>
#
# $Id: junkfilter.four,v 2.22 2003/01/16 01:40:56 gsutter Exp $
#
# Please read the file "README" and the page
# http://junkfilter.zer0.org/ before using junkfilter.
# Four is the testing section. All recipes in beta. Careful!
JFSEC=4
# Block all of China Telecom
# Thanks, Joe Altman <ja@panix.com>
:0
* ^Received:.*\[(202\.(9[6-9]|10[0-9]|11[0-1])|(\[61\.(12[8-9]|13[0-9]|14[0-9]|15[0-9])))\.
{ JFMATCH="$JFSEC: Received from China Telecom" INCLUDERC=$JFDIR/junkfilter.match }
# Block Korea
:0
* ^Received:.*\[210\.12[4567]\.
{ JFMATCH="$JFSEC: Received from KRNIC" INCLUDERC=$JFDIR/junkfilter.match }
# Multiple addresses in From: without single address in Sender:
:0
* $ ^From:.*${JFADDR}${JFWS}?,${JFWS}?${JFADDR}+
* $ ! ^Sender:${JFWS}${JFADDR}${JFWS}${JFNL}
{ JFMATCH="$JFSEC: Invalid From: header" INCLUDERC=$JFDIR/junkfilter.match }
# If only one Received: header AND from a common dialup, junk. (RFMS again)
# Thanks Rik Kabel <rik@netcom.com>
:0
* 2^0
* -1^1 ^\/Received:.*
* $ MATCH ?? from [ ]+(($JFIPNUM\.)+|[-0-9a-z]+|$JFDIALUPS)[ ]+\(\/[-0-9a-z\.]+[ ]
* MATCH ?? \\/[^ ]+
{ JFMATCH="$JFSEC: RapidFire Mail Server: $MATCH" INCLUDERC=$JFDIR/junkfilter.match }
# Hosts claiming to be other hosts... note trailing space
:0
* $ ^X-Authentication-Warning:.*Host ($JFDOMDAM\.)*\/($JFDOMNAM)\.($JFTLD)\>
{
JFHOSTREAL=$MATCH
:0
* $ ^X-Authentication-Warning:.*Host ($JFDOMDAM\.)*($JFDOMNAM)\.($JFTLD)\>[ ]+\[$JFIPNUM\.$JFIPNUM\.$JFIPNUM\.$JFIPNUM\][ ]+claimed to be[ ]+(($JFDOMDAM\.)*\/($JFDOMNAM)\.($JFTLD)|\[$JFIPNUM\.$JFIPNUM\.$JFIPNUM\.$JFIPNUM\])\>
{
JFHOSTCLAIM=$MATCH
:0
* ! JFHOSTREAL ?? JFHOSTCLAIM
{ JFMATCH="$JFSEC: X-Authentication-Warning: a host in $JFHOSTCLAIM claimed to be in $JFHOSTREAL" INCLUDERC=$JFDIR/junkfilter.match }
}
}
# Empty To: header
:0
* $ ^To:$JFWS\(?${JFWS}?\)?${JFWS}[^a-z0-9]+
{ JFMATCH="$JFSEC: Empty To header" INCLUDERC=$JFDIR/junkfilter.match }
# Apparently from self, but Received: header from outside local domain.
:0
* -10000^0
* -10000^0 $ ^Message-Id:.*${JFMAILDOM}
* 10000^0 $ ^From:.*${JFMAILADDRESS}
* -1^1 $ ^Received:${JFWS}from (${JFDOMNAM}\.)*${JFMAILDOM}
* 1^1 ^Received:
{ JFMATCH="$JFSEC: Forged header from self" INCLUDERC=$JFDIR/junkfilter.match }
## Apparently from self, but Received: header from outside local domain.
#:0
#* $ ^Received:${JFWS}from \/.* by (${JFDOMNAM}\.)*${JFMAILDOM}
#* $ ()\/$MATCH by
#* $ $MATCH ?? ${JFMAILDOM}
#{ JFMATCH="$JFSEC: Forged header from Self" INCLUDERC=$JFDIR/junkfilter.match }
# One of these damn spam mailers leaves a distinctive signature
:0
* $ ^From:${JFWS}[0-9][0-9][0-9][0-9]+\.${JFADDR}
* $ ^To:${JFWS}[0-9][0-9][0-9][0-9]+\.
* $ ^Subject:.*-[0-9][0-9][0-9][0-9]+$
{ JFMATCH="$JFSEC: Sent by a not-tricky-enough junk email program" INCLUDERC=$JFDIR/junkfilter.match }
# Bcc: header visible?
:0
* ()\/^Bcc:.*
{ JFMATCH="$JFSEC: Bcc header: $MATCH" INCLUDERC=$JFDIR/junkfilter.match }
# Capital Bogosity In E-Mail Is A Near-Sure Sign Of Spam
# Thanks, Era Erikkson and Phil Hord <phil.hord@antec.com>
#:0D
#* -65^0
#* -1^1 B ?? [-a-z'][,:;]?[ ]+[a-z][-a-z']
#* 1^1 B ?? [-a-z'][,:;]?[ ]+[A-Z][-a-z']
#* 8^1 B ?? ()\<[A-Z][-a-z']+[,:;]?[ ]+[A-Z][-a-z']+[,:;]?[ ]+[A-Z][-a-z']+[,:;]?
#{ JFMATCH="$JFSEC: Capital Bogosity" INCLUDERC=$JFDIR/junkfilter.match }
#* $ ^Message-Id:${JFWS}<.*@\/.*>
#* $ $MATCH ?? .*>
# Message-Id: from domain that's not in any Received: header
:0
* $ ^Message-Id:${JFWS}<.*@.*$JFDOMNAM\.$JFTLD>
* $ $MATCH ?? ^Received:.*>
{ JFMATCH="$JFSEC: Message-Id from domain not in Received headers" INCLUDERC=$JFDIR/junkfilter.match }
# If it's all in base64, it's junk.
# exception: Content-Type is S/MIME
:0
* ^Content-Transfer-Encoding:[ ]*base64
* ! ^Content-Type:[ ]*application/(x-)?pkcs7-mime
{ JFMATCH="$JFSEC: Entire email base64 encoded" INCLUDERC=$JFDIR/junkfilter.match }
JFBADCHARSET=(big5|euc-kr|gb2312|gbk|koi8-r|ks_c_5601-1987|windows-(874|125[14]))
# If it's MIME...
:0
* ^MIME-Version:
* ^Content-Type:.*$?(.*$)?(.*$)?[ ]+boundary *= *\"?\/[^\";]+
{
JFMIMEBND1=$MATCH
# LOG="multipart-mixed mail: boundary: --> $JFMIMEBND1 <--
#"
# even if it's hidden a second MIME level deep...
:0 B
* $ ^(--)?${JFMIMEBND1}\<Content-Type:.*($[ ]+)?boundary *= *\"?\/[^\";]+
{
JFMIMEBND2=$MATCH
}
# and got an html part encoded in base64, it's junk.
:0 B
* $ ^(--)?(${JFMIMEBND1}|${JFMIMEBND2})\<Content-Type:[ ]*text/html;\<(.*\<)?(.*\<)?Content-Transfer-Encoding:[ ]*base64
{ JFMATCH="$JFSEC: Base64-encoded HTML" INCLUDERC=$JFDIR/junkfilter.match }
# and got a text/plain part encoded in base64, it's junk.
:0 B
* $ ^(--)?(${JFMIMEBND1}|${JFMIMEBND2})\<Content-Type:[ ]*text/plain;\<(.*\<)?(.*\<)?Content-Transfer-Encoding:[ ]*base64
{ JFMATCH="$JFSEC: Base64-encoded text/plain section" INCLUDERC=$JFDIR/junkfilter.match }
# # and got any part in base64, it's junk.
# :0 B
# * $ ^(--)?(${JFMIMEBND1}|${JFMIMEBND2})\<Content-Type:.*\<(.*\<)?(.*\<)?Content-Transfer-Encoding:[ ]*base64
# { JFMATCH="$JFSEC: Base64-encoded MIME attachment" INCLUDERC=$JFDIR/junkfilter.match }
# and got a part in a charset I don't understand, it's junk.
:0 B
* $ ^(--)?(${JFMIMEBND1}|${JFMIMEBND2})\<Content-Type:(.*$)?[ ]+charset=\"?\/${JFBADCHARSET}
{ JFMATCH="$JFSEC: MIME attachment in charset $MATCH" INCLUDERC=$JFDIR/junkfilter.match }
# and got an empty MIME part, it's junk.
:0 B
* $ ^(--)?(${JFMIMEBND1}|${JFMIMEBND2})\<Content-.*$(.*$)?Content-.*$+${MATCH}
{ JFMATCH="$JFSEC: empty MIME attachment" INCLUDERC=$JFDIR/junkfilter.match }
# and _doesn't_ have an inline, 7-bit part, it's junk.
:0 B
* $ ^(--)?(${JFMIMEBND1}|${JFMIMEBND2})\<Content-Type:.*\<(.*\<)?(.*\<)?Content-(Disposition|Transfer-Encoding):
* ! $ ^(--)?(${JFMIMEBND1}|${JFMIMEBND2})\<Content-Type:[ ]+text/[-_a-z0-9]+
* ! $ ^(--)?(${JFMIMEBND1}|${JFMIMEBND2})\<Content-Type:.*\<(.*\<)?(.*\<)?Content-Transfer-Encoding:[ ]*(quoted-printable|7bit)
* ! $ ^(--)?(${JFMIMEBND1}|${JFMIMEBND2})\<Content-Type:.*\<(.*\<)?(.*\<)?Content-Disposition:[ ]*inline
{ JFMATCH="$JFSEC: MIME with no quoted-printable part" INCLUDERC=$JFDIR/junkfilter.match }
}
# Kill charsets that I don't understand from From: and Subject:
:0
* $ ^(From|Subject):[ ]*=\?\/$JFBADCHARSET
{ JFMATCH="$JFSEC: Subject in charset $MATCH" INCLUDERC=$JFDIR/junkfilter.match }
# Kill charsets that I don't understand using Content-Type:
# commented out 2002-03-04 due to many many false matches
#:0 HB
#* $ ^Content-Type:.*charset=\"?\/$JFBADCHARSET
#{ JFMATCH="$JFSEC: Message in charset $MATCH" INCLUDERC=$JFDIR/junkfilter.match }
#* ^Subject:[ ]*\/[^-_+=!@#$%^&*() 0-9a-z\[\]\|\\,<.>/?;:'"`~]+
# \0127-\0254
# Kill non-English (latin-1, iso-8859-1) characters in subjects
#:0
#* $ ^Subject:[ ]*\/[^($JFPCHAR|$JFWS)]+
#{ JFMATCH="$JFSEC: Subject contains data ($MATCH) in non-western charset" INCLUDERC=$JFDIR/junkfilter.match }
#* ^Subject:[ ]*\/[^-_+=!@#$%^&*() 0-9a-z\[\]\|\\,<.>/?;:'"`~]+
#* $ ^Subject:[ ]*\/[\127-\254]+
# Kill non-English (latin-1, iso-8859-1) characters in subjects
:0
* $ ^Subject:[ ]*\/[^[:print:]]+
{ JFMATCH="$JFSEC: Subject has data ($MATCH) in non-western charset" INCLUDERC=$JFDIR/junkfilter.match }
# mails in HTML-only are >99% spam
# from arjan de vet
:0
* $ ^Content-Type:${JFWS}text/html
{ JFMATCH="$JFSEC: HTML-only mail" INCLUDERC=$JFDIR/junkfilter.match }
# Subject: line contains five or more consecutive instances of
# a single character followed by whitespace.
:0
* $ ^Subject:[ ]*(${JFPCHAR}${JFWS})(${JFPCHAR}${JFWS})(${JFPCHAR}${JFWS})(${JFPCHAR}${JFWS})(${JFPCHAR}${JFWS})+
{ JFMATCH="$JFSEC: Subject is spaced out" INCLUDERC=$JFDIR/junkfilter.match }
## Use external program 'rblcheck' to see if the source should be blackholed
#:0
#* $ 1^1 ^Received:.*\[\/${JFIP}
#* $ ! ? rblcheck -q $MATCH
#{ JFMATCH="$JFSEC: IP address $MATCH is in RBL" INCLUDERC=$JFDIR/junkfilter.match }
# Received: liar claims to be from AOL
:0
* 1^1 ^Received: from aol.com \(
* -1^0 ^Received: from aol.com \((.*\.)aol.com
{ JFMATCH="$JFSEC: Falsely claims to be from aol.com" INCLUDERC=$JFDIR/junkfilter.match }
# Body contains lots of upper ASCII characters
# was 1^1.2 but added up too quickly.
:0 B
* -1^1 .
* 1^1.1 [^ -~]
{ JFMATCH="$JFSEC: Contains too many high ASCII characters (score: $=)" INCLUDERC=$JFDIR/junkfilter.match }
JFSEC
# EOF junkfilter.four
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