[Mimedefang] Mimedefang Help needed
Link, Pete
plink at fna.com
Tue Apr 22 13:44:01 EDT 2003
I am unclear why SpamAssassinReport.txt gets attached twice AND each file
displays a different score.
I am attaching examples and my mimedefang-filter file.
What do I need to change in the mimedefang-filter to get the
SpamAssassinReport.txt to attach only ONCE?
Why the different score?
<<SpamAssassinReport.txt>> <<SpamAssassinReport.txt>> <<defang.txt>>
-------------- next part --------------
SPAM: -------------------- Start SpamAssassin results ----------------------
SPAM: This mail is probably spam. The original message has been altered
SPAM: so you can recognise or block similar unwanted mail in future.
SPAM: See http://spamassassin.org/tag/ for more details.
SPAM:
SPAM: Content analysis details: (4.20 hits, 1 required)
SPAM: SUBJECT_FREQ (-0.7 points) Subject contains a frequency - probable newsletter
SPAM: USER_AGENT_OUTLOOK (-0.0 points) X-Mailer header indicates a non-spam MUA (Outlook)
SPAM: FORGED_RCVD_FOUND (0.8 points) Possibly-forged 'Received:' header found
SPAM: AOL_USERS_LINK (0.5 points) BODY: Includes a link for AOL users to click
SPAM: REMOVAL_INSTRUCTIONS (0.4 points) BODY: Gives instructions for removal from list
SPAM: CLICK_BELOW_CAPS (0.4 points) BODY: Asks you to click below (in caps)
SPAM: CLICK_BELOW (0.3 points) BODY: Asks you to click below
SPAM: SPAM_PHRASE_05_08 (1.6 points) BODY: Spam phrases score is 05 to 08 (medium)
SPAM: [score: 6]
SPAM: CLICK_HERE_CAPS_LINK (0.6 points) BODY: Tells you to click on a URL (in caps)
SPAM: CLICK_HERE_LINK (0.3 points) BODY: Tells you to click on a URL
SPAM:
SPAM: -------------------- End of SpamAssassin results ---------------------
-------------- next part --------------
SPAM: -------------------- Start SpamAssassin results ----------------------
SPAM: This mail is probably spam. The original message has been altered
SPAM: so you can recognise or block similar unwanted mail in future.
SPAM: See http://spamassassin.org/tag/ for more details.
SPAM:
SPAM: Content analysis details: (4.00 hits, 1 required)
SPAM: SUBJECT_FREQ (-0.7 points) Subject contains a frequency - probable newsletter
SPAM: X_LOOP (-0.2 points) Found a X-Loop header
SPAM: USER_AGENT_OUTLOOK (-0.0 points) X-Mailer header indicates a non-spam MUA (Outlook)
SPAM: FORGED_RCVD_FOUND (0.8 points) Possibly-forged 'Received:' header found
SPAM: AOL_USERS_LINK (0.5 points) BODY: Includes a link for AOL users to click
SPAM: REMOVAL_INSTRUCTIONS (0.4 points) BODY: Gives instructions for removal from list
SPAM: CLICK_BELOW_CAPS (0.4 points) BODY: Asks you to click below (in caps)
SPAM: CLICK_BELOW (0.3 points) BODY: Asks you to click below
SPAM: SPAM_PHRASE_05_08 (1.6 points) BODY: Spam phrases score is 05 to 08 (medium)
SPAM: [score: 5]
SPAM: CLICK_HERE_CAPS_LINK (0.6 points) BODY: Tells you to click on a URL (in caps)
SPAM: CLICK_HERE_LINK (0.3 points) BODY: Tells you to click on a URL
SPAM:
SPAM: -------------------- End of SpamAssassin results ---------------------
-------------- next part --------------
# -*- Perl -*-
#***********************************************************************
#
# mimedefang-filter
#
# Suggested minimum-protection filter for Microsoft Windows clients, plus
# SpamAssassin checks if SpamAssassin is installed.
#
# Copyright (C) 2002 Roaring Penguin Software Inc.
#
# This program may be distributed under the terms of the GNU General
# Public License, Version 2, or (at your option) any later version.
#
# $Id: suggested-minimum-filter-for-windows-clients,v 1.48 2002/09/12 15:43:27 dfs Exp $
#***********************************************************************
#***********************************************************************
# Set administrator's e-mail address here. The administrator receives
# quarantine messages and is listed as the contact for site-wide
# MIMEDefang policy. A good example would be 'defang-admin at mydomain.com'
#***********************************************************************
#
#$AdminAddress = 'postmaster at localhost';
#$AdminName = "MIMEDefang Administrator's Full Name";
#
$AdminAddress = 'plink at fna.com';
$AdminName = "Pete Link";
#***********************************************************************
# Set the e-mail address from which MIMEDefang quarantine warnings and
# user notifications appear to come. A good example would be
# 'mimedefang at mydomain.com'. Make sure to have an alias for this
# address if you want replies to it to work.
#***********************************************************************
#$DaemonAddress = 'mimedefang at localhost';
$DaemonAddress = 'defang at mre.net';
#***********************************************************************
# If you set $AddWarningsInline to 1, then MIMEDefang tries *very* hard
# to add warnings directly in the message body (text or html) rather
# than adding a separate "WARNING.TXT" MIME part. If the message
# has no text or html part, then a separate MIME part is still used.
#***********************************************************************
$AddWarningsInline = 0;
#***********************************************************************
# Set various stupid things your mail client does below.
#***********************************************************************
# Set the next one if your mail client cannot handle nested multipart
# messages. DO NOT set this lightly; it will cause action_add_part to
# work rather strangely. Leave it at zero, even for MS Outlook, unless
# you have serious problems.
$Stupidity{"flatten"} = 0;
# Set the next one if your mail client cannot handle multiple "inline"
# parts.
$Stupidity{"NoMultipleInlines"} = 0;
# This procedure returns true for entities with bad filenames.
sub filter_bad_filename ($) {
my($entity) = @_;
my($bad_exts, $re);
# Bad extensions
$bad_exts = '(ade|adp|app|asd|asf|asx|bas|bat|chm|cmd|com|cpl|crt|dll|exe|fxp|hlp|hta|hto|inf|ini|ins|isp|jse?|lib|lnk|mdb|mde|msc|msi|msp|mst|ocx|pcd|pif|prg|reg|scr|sct|sh|shb|shs|sys|url|vb|vbe|vbs|vcs|vxd|wmd|wms|wmz|wsc|wsf|wsh|\{)';
# Do not allow:
# - curlies
# - bad extensions (possibly with trailing dots) at end or
# followed by non-alphanum
$re = '\.' . $bad_exts . '\.*([^-A-Za-z0-9_.,]|$)';
return re_match($entity, $re);
}
# Scan for a virus using the first supported virus scanner we find.
sub message_contains_virus () {
return message_contains_virus_avp() if ($Features{'Virus:AVP'});
return message_contains_virus_fprot() if ($Features{'Virus:FPROT'});
return message_contains_virus_fsav() if ($Features{'Virus:FSAV'});
return message_contains_virus_hbedv() if ($Features{'Virus:HBEDV'});
return message_contains_virus_nai() if ($Features{'Virus:NAI'});
return message_contains_virus_nvcc() if ($Features{'Virus:NVCC'});
return message_contains_virus_rav() if ($Features{'Virus:RAV'});
return message_contains_virus_sophie() if ($Features{'Virus:SOPHIE'});
return message_contains_virus_sophos() if ($Features{'Virus:SOPHOS'});
return message_contains_virus_trend() if ($Features{'Virus:TREND'});
return message_contains_virus_filescan() if ($Features{'Virus:FileScan'});
return message_contains_virus_clamav() if ($Features{'Virus:CLAMAV'});
return (wantarray ? (0, 'ok', 'ok') : 0);
}
# Scan for a virus using the first supported virus scanner we find.
sub entity_contains_virus ($) {
my($e) = @_;
return entity_contains_virus_avp($e) if ($Features{'Virus:AVP'});
return entity_contains_virus_fprot($e) if ($Features{'Virus:FPROT'});
return entity_contains_virus_fsav($e) if ($Features{'Virus:FSAV'});
return entity_contains_virus_hbedv($e) if ($Features{'Virus:HBEDV'});
return entity_contains_virus_nai($e) if ($Features{'Virus:NAI'});
return entity_contains_virus_nvcc($e) if ($Features{'Virus:NVCC'});
return entity_contains_virus_rav($e) if ($Features{'Virus:RAV'});
return entity_contains_virus_sophie($e) if ($Features{'Virus:SOPHIE'});
return entity_contains_virus_sophos($e) if ($Features{'Virus:SOPHOS'});
return entity_contains_virus_trend($e) if ($Features{'Virus:TREND'});
return entity_contains_virus_filescan($e) if ($Features{'Virus:FileScan'});
return entity_contains_virus_clamav($e) if ($Features{'Virus:CLAMAV'});
return (wantarray ? (0, 'ok', 'ok') : 0);
}
#***********************************************************************
# %PROCEDURE: filter_begin
# %ARGUMENTS:
# None
# %RETURNS:
# Nothing
# %DESCRIPTION:
# Called just before e-mail parts are processed
#***********************************************************************
#BEGINNING OF FILTER by PSL*********************************************
#***********************************************************************
sub filter_begin {
my $bounce = "no";
# Don't run SA against messages bigger than 200k
##################BOUNCE MESSAGES by PSL***The below only bounces a message***
##################
if ((-s "./INPUTMSG") <= (200 * 1024)) {
my($hits, $req, $names, $report) = spam_assassin_check();
# $SAReport = $report;
# if ($hits >= $req) {
# action_add_header("X-Spam-Warning", "SpamAssassin says this message is SPAM");
# action_add_header("X-Spam-Status", "Yes, hits=$hits required=$req");
# action_add_header("X-Spam-Report","$report");
# } else {
# action_add_header("X-Spam-Status", "No");
# }
# # if we're quite confident it actually IS spam, just bounce it
#Below edited by PSL#
#if ($hits > 10) {
if ($hits > 5) {
$bounce = "yes";
action_quarantine_entire_message();
action_bounce("Message seems to be spam, rejected");
}
}
# if we haven't bounced the msg yet lets do some more tests
if($bounce eq "no") {
open(IN, "<./HEADERS");
while(<IN>) {
if(/beleskari/i) {
$bounce = "yes";
action_quarantine_entire_message();
action_bounce("Porn not welcome here");
last;
}
}
close(IN);
}
}
#***********************************************************************
#END OF FILTER by PSL***************************************************
#***********************************************************************
#sub filter_begin () {
# # ALWAYS drop messages with suspicious chars in headers
# if ($SuspiciousCharsInHeaders) {
# action_quarantine_entire_message("Message quarantined because of suspicious characters in headers");
# # Do NOT allow message to reach recipient(s)
# return action_discard();
# }
#
# # Scan for viruses if any virus-scanners are installed
# my($code, $category, $action) = message_contains_virus();
# $FoundVirus = ($category eq "virus");
#}
#***********************************************************************
# %PROCEDURE: filter
# %ARGUMENTS:
# entity -- a Mime::Entity object (see MIME-tools documentation for details)
# fname -- the suggested filename, taken from the MIME Content-Disposition:
# header. If no filename was suggested, then fname is ""
# ext -- the file extension (everything from the last period in the name
# to the end of the name, including the period.)
# type -- the MIME type, taken from the Content-Type: header.
#
# NOTE: There are two likely and one unlikely place for a filename to
# appear in a MIME message: In Content-Disposition: filename, in
# Content-Type: name, and in Content-Description. If you are paranoid,
# you will use the re_match and re_match_ext functions, which return true
# if ANY of these possibilities match. re_match checks the whole name;
# re_match_ext checks the extension. See the sample filter below for usage.
# %RETURNS:
# Nothing
# %DESCRIPTION:
# This function is called once for each part of a MIME message.
# There are many action_*() routines which can decide the fate
# of each part; see the mimedefang-filter man page.
#***********************************************************************
sub filter ($$$$) {
my($entity, $fname, $ext, $type) = @_;
return if message_rejected(); # Avoid unnecessary work
# Block message/partial parts
if (lc($type) eq "message/partial") {
action_quarantine_entire_message("Message quarantined because of message/partial type");
return action_discard();
}
# Virus scan
if ($FoundVirus) {
my($code, $category, $action);
$VirusScannerMessages = "";
($code, $category, $action) = entity_contains_virus($entity);
if ($category eq "virus") {
return action_quarantine($entity, "A known virus was discovered and deleted. Virus-scanner messages follow:\n$VirusScannerMessages\n\n");
}
}
if (filter_bad_filename($entity)) {
return action_quarantine($entity, "An attachment named $fname was removed from this document as it\nconstituted a security hazard. If you require this document, please contact\nthe sender and arrange an alternate means of receiving it.\n");
}
# eml is bad if it's not multipart
if (re_match($entity, '\.eml')) {
return action_quarantine($entity, "A non-multipart attachment named $fname was removed from this document as it\nconstituted a security hazard. If you require this document, please contact\nthe sender and arrange an alternate means of receiving it.\n");
}
# Clean up HTML if Anomy::HTMLCleaner is installed.
if ($Features{"HTMLCleaner"}) {
if ($type eq "text/html") {
return anomy_clean_html($entity);
}
}
return action_accept();
}
#***********************************************************************
# %PROCEDURE: filter_multipart
# %ARGUMENTS:
# entity -- a Mime::Entity object (see MIME-tools documentation for details)
# fname -- the suggested filename, taken from the MIME Content-Disposition:
# header. If no filename was suggested, then fname is ""
# ext -- the file extension (everything from the last period in the name
# to the end of the name, including the period.)
# type -- the MIME type, taken from the Content-Type: header.
# %RETURNS:
# Nothing
# %DESCRIPTION:
# This is called for multipart "container" parts such as message/rfc822.
# You cannot replace the body (because multipart parts have no body),
# but you should check for bad filenames.
#***********************************************************************
sub filter_multipart ($$$$) {
my($entity, $fname, $ext, $type) = @_;
if (filter_bad_filename($entity)) {
action_notify_administrator("A MULTIPART attachment of type $type, named $fname was dropped.\n");
return action_drop_with_warning("An attachment of type $type, named $fname was removed from this document as it\nconstituted a security hazard. If you require this document, please contact\nthe sender and arrange an alternate means of receiving it.\n");
}
# eml is bad if it's not message/rfc822
if (re_match($entity, '\.eml') and ($type ne "message/rfc822")) {
return action_drop_with_warning("A non-message/rfc822 attachment named $fname was removed from this document as it\nconstituted a security hazard. If you require this document, please contact\nthe sender and arrange an alternate means of receiving it.\n");
}
# Block message/partial parts
if (lc($type) eq "message/partial") {
action_quarantine_entire_message("Message quarantined because of message/partial type");
return action_discard();
}
return action_accept();
}
#***********************************************************************
# %PROCEDURE: defang_warning
# %ARGUMENTS:
# oldfname -- the old file name of an attachment
# fname -- the new "defanged" name
# %RETURNS:
# A warning message
# %DESCRIPTION:
# This function customizes the warning message when an attachment
# is defanged.
#***********************************************************************
sub defang_warning ($$) {
my($oldfname, $fname) = @_;
return
"An attachment named '$oldfname' was converted to '$fname'.\n" .
"To recover the file, right-click on the attachment and Save As\n" .
"'$oldfname'\n";
}
# If SpamAssassin found SPAM, append report. We do it as a separate
# attachment of type text/plain
#***********************************************************************
#BEGINNING OF FILTER by PSL*********************************************
#***********************************************************************
sub filter_end_aux ($) {
my($entity) = @_;
# No sense doing any extra work
return if message_rejected();
# Spam checks if SpamAssassin is installed
if ($Features{"SpamAssassin"}) {
if (-s "./INPUTMSG" < 200*1024) {
# Only scan messages smaller than 200kB. Larger messages
# are extremely unlikely to be spam, and SpamAssassin is
# dreadfully slow on very large messages.
my($hits, $req, $names, $report) = spam_assassin_check();
if ($hits >= $req) {
md_log('spam', $hits, $RelayAddr);
my($score);
if ($hits < 40) {
$score = "*" x int($hits);
} else {
$score = "*" x 40;
}
# We add a header which looks like this:
# X-Spam-Score: 6.8 (******) NAME_OF_TEST,NAME_OF_TEST
# The number of asterisks in parens is the integer part
# of the spam score clamped to a maximum of 40.
# MUA filters can easily be written to trigger on a
# minimum number of asterisks...
#action_change_header("X-Spam-Score", "$hits ($score) $names");
action_add_header("X-Spam-Warning", "SpamAssassin says this message is SPAM");
action_add_header("X-Spam-Status", "Yes, hits=$hits required=$req");
action_add_header("X-Spam-Report","$report");
} else {
action_add_header("X-Spam-Status", "No");
}
# if we're quite confident it actually IS spam, just bounce it
if ($hits > 5) {
$bounce = "yes";
action_quarantine_entire_message();
action_bounce("Message seems to be spam, rejected");
}
# If you find the SA report useful, add it, I guess...
#action_add_part($entity, "text/plain", "-suggest",
# "$report\n",
# "SpamAssassinReport.txt", "inline");
} else {
# Delete any existing X-Spam-Score header?
action_delete_header("X-Spam-Score");
}
# Now this is the real filter_end
sub filter_end ($) {
my($entity) = @_;
# Do the real work
filter_end_aux($entity);
# And send notifications
send_quarantine_notifications();
}
}
}
#***********************************************************************
#END OF FILTER by PSL***************************************************
#***********************************************************************
sub filter_end ($) {
my($entity) = @_;
# No sense doing any extra work
return if message_rejected();
# Spam checks if SpamAssassin is installed
if ($Features{"SpamAssassin"}) {
if (-s "./INPUTMSG" < 100*1024) {
# Only scan messages smaller than 100kB. Larger messages
# are extremely unlikely to be spam, and SpamAssassin is
# dreadfully slow on very large messages.
my($hits, $req, $names, $report) = spam_assassin_check();
if ($hits >= $req) {
my($score);
if ($hits < 40) {
$score = "*" x int($hits);
} else {
$score = "*" x 40;
}
# We add a header which looks like this:
# X-Spam-Score: 6.8 (******) NAME_OF_TEST,NAME_OF_TEST
# The number of asterisks in parens is the integer part
# of the spam score clamped to a maximum of 40.
# MUA filters can easily be written to trigger on a
# minimum number of asterisks...
action_change_header("X-Spam-Score", "$hits ($score) $names");
# If you find the SA report useful, add it, I guess...
action_add_part($entity, "text/plain", "-suggest",
"$report\n",
"SpamAssassinReport.txt", "inline");
}
}
}
}
# DO NOT delete the next line, or Perl will complain.
1;
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