fakessh blog @

pour la communaute je joins mon filtre mimedefang-filter tel que je l’ai ecrit
avec les commentaires et le code rajouté
les commentaires expliquent la raison du retrait

voici le code

~]# cat /etc/mail/mimedefang-filter
# -*- 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.
#
# $Id$
#*******************************************************************
use Geo::IP::PurePerl; #necessaire pour la geolocalisation
#*******************************************************************
# 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@mydomain.com’
#***********************************************************************
$AdminAddress = ‘postmaster@localhost’;
$AdminName = « MIMEDefang Administrator’s Full Name »;

#***********************************************************************
# Set the e-mail address from which MIMEDefang quarantine warnings and
# user notifications appear to come. A good example would be
# ‘mimedefang@mydomain.com’. Make sure to have an alias for this
# address if you want replies to it to work.
#***********************************************************************
$DaemonAddress = ‘mimedefang@localhost’;

#***********************************************************************
# 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;

#*******************************************************************
# To enable syslogging of virus and spam activity, add the following
# to the filter:
# md_graphdefang_log_enable();
# You may optionally provide a syslogging facility by passing an
# argument such as: md_graphdefang_log_enable(‘local4′); If you do this, # be
# sure to setup the new syslog facility (probably in /etc/syslog.conf).
# An optional second argument causes a line of output to be produced
# for each recipient (if it is 1), or only a single summary line
# for all recipients (if it is 0.) The default is 1.
# Comment this line out to disable logging.
#*******************************************************************
md_graphdefang_log_enable(‘mail’, 1);

#*******************************************************************
# Uncomment this to block messages with more than 50 parts. This will
# *NOT* work unless you’re using Roaring Penguin’s patched version
# of MIME tools, version MIME-tools-5.411a-RP-Patched-02 or later.
#
# WARNING: DO NOT SET THIS VARIABLE unless you’re using at least
# MIME-tools-5.411a-RP-Patched-02; otherwise, your filter will fail.
#*******************************************************************
# $MaxMIMEParts = 50;

#*******************************************************************
# Set various stupid things your mail client does below.
#*******************************************************************

# Set the next one if your mail client cannot handle multiple « inline »
# parts.
$Stupidity{« NoMultipleInlines »} = 1;

# Detect and load Perl modules
detect_and_load_perl_modules();

# 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:
# – CLSIDs {foobarbaz}
# – bad extensions (possibly with trailing dots) at end
$re = ‘\.’ . $bad_exts . ‘\.*$’;

return 1 if (re_match($entity, $re));

# Look inside ZIP files
if (re_match($entity, ‘\.zip$’) and
$Features{« Archive::Zip »}) {
my $bh = $entity->bodyhandle();
if (defined($bh)) {
my $path = $bh->path();
if (defined($path)) {
return re_match_in_zip_directory($path, $re);
}
}
}
return 0;
}

#*******************************************************************
# %PROCEDURE: filter_begin
# %ARGUMENTS:
# $entity — the parsed MIME::Entity
# %RETURNS:
# Nothing
# %DESCRIPTION:
# Called just before e-mail parts are processed
#*******************************************************************
sub filter_begin {
my($entity) = @_;
# ALWAYS drop messages with suspicious chars in headers
if ($SuspiciousCharsInHeaders) {
md_graphdefang_log(‘suspicious_chars’);
# action_quarantine_entire_message(« Message quarantined because of suspicious characters in headers »);
# Do NOT allow message to reach recipient(s)
return action_discard();
}

# Copy original message into work directory as an « mbox » file for
# virus-scanning
md_copy_orig_msg_to_work_dir_as_mbox_file();

# Scan for viruses if any virus-scanners are installed
my($code, $category, $action) = message_contains_virus();

# Lower level of paranoia – only looks for actual viruses
$FoundVirus = ($category eq « virus »);

# Higher level of paranoia – takes care of « suspicious » objects
# $FoundVirus = ($action eq « quarantine »);

if ($FoundVirus) {
md_graphdefang_log(‘virus’, $VirusName, $RelayAddr);
md_syslog(‘warning’, « Discarding because of virus $VirusName »);
return action_discard();
}

if ($action eq « tempfail ») {
action_tempfail(« Problem running virus-scanner »);
md_syslog(‘warning’, « Problem running virus scanner: code=$code, category=$category, action=$action »);
}
}

#*******************************************************************
# %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 ») {
## md_graphdefang_log(‘message/partial’);
## action_bounce(« MIME type message/partial not accepted here »);
## return action_discard();
## }

## if (filter_bad_filename($entity)) {
## md_graphdefang_log(‘bad_filename’, $fname, $type);
## return action_drop_with_warning(« 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 »);
## }

## 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) = @_;

## return if message_rejected(); # Avoid unnecessary work
##
## if (filter_bad_filename($entity)) {
## md_graphdefang_log(‘bad_filename’, $fname, $type);
## 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 »);
## }

# Block message/partial parts
## if (lc($type) eq « message/partial ») {
## md_graphdefang_log(‘message/partial’);
## action_bounce(« MIME type message/partial not accepted here »);
## return;
## }

## 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
sub filter_end {
my($entity) = @_;

# If you want quarantine reports, uncomment next line
# send_quarantine_notifications();

# IMPORTANT NOTE: YOU MUST CALL send_quarantine_notifications() AFTER
# ANY PARTS HAVE BEEN QUARANTINED. SO IF YOU MODIFY THIS FILTER TO
# QUARANTINE SPAM, REWORK THE LOGIC TO CALL send_quarantine_notifications()
# AT THE END!!!

# No sense doing any extra work
return if message_rejected();

# Spam checks if SpamAssassin is installed
if ($Features{« SpamAssassin »}) {
if (-s « ./INPUTMSG » < 100*10240000) {
# Only scan messages smaller than 100kB. Larger messages
# are extremely unlikely to be spam, and SpamAssassin is
# dreadfully slow on very large messages.
my($hits, $req, $names, $report) = spam_assassin_check();
my($score);
if ($hits < 4000) {
$score = « * » x int($hits);
} else {
$score = « * » x 40;
}
# We add a header which looks like this:
# X-Spam-Score: 6.8 (******) NAME_OF_TEST,NAME_OF_TEST
# The number of asterisks in parens is the integer part
# of the spam score clamped to a maximum of 40.
# MUA filters can easily be written to trigger on a
# minimum number of asterisks…
if ($hits >= $req) {
action_change_header(« X-Spam-Score », « $hits ($score) $names »);
action_add_header(« X-AntiAbuse-Helo », « $Helo »);
action_add_header(« X-AntiAbuse-Relayhostname », « $RelayHostname »);
action_add_header(« X-AntiAbuse-Relayaddr », « $RelayAddr »);
action_add_header(« X-AntiAbuse-Sender », « $Sender « );
action_add_header(« X-AntiAbuse-Score », « $hits ($score) $names »);

$gi = Geo::IP::PurePerl->new( « /usr/share/GeoIP/GeoLiteCity.dat », GEOIP_STANDARD );
my (
$country_code, $country_code3, $country_name, $region,
$city, $postal_code, $latitude, $longitude,
$metro_code, $area_code
) = $gi->get_city_record($Helo);

action_add_header(« X-Header-Country », « $country_code »);
action_add_header(« X-Header-CountryCode3″, « $country_code3″);
action_add_header(« X-Header-CountryName », « $country_name »);
action_add_header(« X-Header-Region », « $region »);
action_add_header(« X-Header-City » , « $city »);
action_add_header(« X-Header-PostalCode » , « $postal_code »);
action_add_header(« X-Header-Latitude », « $latitude »);
action_add_header(« X-Header-Longitude », « $longitude »);
action_add_header(« X-Header-MetroCode », « $metro_code »);
action_add_header(« X-Header-AreaCode », « $area_code »);

md_graphdefang_log(‘spam’, $hits, $RelayAddr);

# 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 »);
action_add_header(« X-AntiAbuse-Helo », « $Helo »);
action_add_header(« X-AntiAbuse-Relayhostname », « $RelayHostname »);
action_add_header(« X-AntiAbuse-Relayaddr », « $RelayAddr »);
action_add_header(« X-AntiAbuse-Sender », « $Sender « );
action_add_header(« X-AntiAbuse-Score », « $hits ($score) $names »);
$gi = Geo::IP::PurePerl->new( « /usr/share/GeoIP/GeoLiteCity.dat », GEOIP_STANDARD );

my (
$country_code, $country_code3, $country_name, $region,
$city, $postal_code, $latitude, $longitude,
$metro_code, $area_code
) = $gi->get_city_record($Helo);
action_add_header(« X-Header-Country », « $country_code »);
action_add_header(« X-Header-CountryCode3″, « $country_code3″);
action_add_header(« X-Header-CountryName », « $country_name »);
action_add_header(« X-Header-Region », « $region »);
action_add_header(« X-Header-City » , « $city »);
action_add_header(« X-Header-PostalCode » , « $postal_code »);
action_add_header(« X-Header-Latitude », « $latitude »);
action_add_header(« X-Header-Longitude », « $longitude »);
action_add_header(« X-Header-MetroCode », « $metro_code »);
action_add_header(« X-Header-AreaCode », « $area_code »);

}
}
}

# I HATE HTML MAIL! If there’s a multipart/alternative with both
# text/plain and text/html parts, nuke the text/html. Thanks for
# wasting our disk space and bandwidth…

# If you want to strip out HTML parts if there is a corresponding
# plain-text part, uncomment the next line.
# remove_redundant_html_parts($entity);

md_graphdefang_log(‘mail_in’);

# Deal with malformed MIME.
# Some viruses produce malformed MIME messages that are misinterpreted
# by mail clients. They also might slip under the radar of MIMEDefang.
# If you are worried about this, you should canonicalize all
# e-mail by uncommenting the action_rebuild() line. This will
# force _all_ messages to be reconstructed as valid MIME. It will
# increase the load on your server, and might break messages produced
# by marginal software. Your call.

# action_rebuild();
}

# DO NOT delete the next line, or Perl will complain.
1;

ce code fonctionne parfaitement il est simplifier au maximum pour l’utlisation la plus courante des serveurs mail sans casser les standards

ce code est libre de droit et peut etre librement reutiliser
merci de me faire parvenir un petit mot quand meme

This article is copyright © by admin: Sat May 19 17:29:20 UTC 2012