Note - Amavis & Spamassassin will be deprecated from IPFire add-ons (Pakfire) with Core Update 153.
This wiki describes how you can setup a mail proxy with Postfix on IPFire, which filters virus and spam mails in fore-field hence infested mails won't belong to your internal mailserver.
Postfix Amavis SpamAssassin ClamAV 7Zip
IP-Country-2.28-1 Mail-DKIM-0.40-1 Mail-SPF-v2.9.0-1 NetAddr-IP-4.071-1 Net-Ident-1.23-1 lzop-1.03-1 tnef-1.4.10-1 cabextract-1.4 pax-3.4 nomarch-1.4 razor-agents-sdk-2.04 razor-agents-2.84 # Ist abhängig zu razor-agents-sdk unrar-5.0.14 zoo-2.10
The installation can easily be done with Pakfire over the IPFire WUI.
Postfix should be installed with the presetting Internet with smarthost. After the basic installation has been done, the appropriate properties on main.cf should be indicated. A backup of the original file are strongly recommended!
###
### main.cf for IPFire
###
queue_directory = /var/spool/postfix
command_directory = /usr/sbin
daemon_directory = /usr/lib/postfix
manpage_directory = /usr/share/man
sample_directory = /etc/postfix
html_directory = no
readme_directory = no
sendmail_path = /usr/sbin/sendmail
newaliases_path = /usr/bin/newaliases
mailq_path = /usr/bin/mailq
strict_rfc821_envelopes = yes
biff = no
append_dot_mydomain = no
readme_directory = no
mail_owner = postfix
setgid_group = postdrop
myhostname = my.ipfire.domain
myorigin = $myhostname
inet_interfaces = all
#proxy_interfaces =
#mydestination = $myhostname, localhost, mysql:/etc/postfix/mysql-mydestination.cf
mydestination = my.mailserver.domain, my.domain
#relay_domains = my.mailserver.domain, my.domain
unknown_local_recipient_reject_code = 550
local_recipient_maps =
local_transport = error:local mail delivery is disabled
transport_maps = hash:/etc/postfix/transport
mynetworks_style = host
mynetworks = 127.0.0.0/8, 192.168.xxx.xxx/24, 192.168.xxx.xxx/24
relay_domains = $mydestination
#relayhost = $mydomain
#relayhost = [gateway.my.domain]
#relayhost = [mailserver.isp.tld]
#relayhost = uucphost
#relayhost = [an.ip.add.ress]
#relay_recipient_maps = hash:/etc/postfix/relay_recipients
#in_flow_delay = 1s
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
recipient_delimiter = +
mailbox_size_limit = 0
message_size_limit = 10240000
#mailbox_transport = cyrus
#cyrus_destination_recipient_limit=1
header_checks = regexp:/etc/postfix/header_checks
#fast_flush_domains = $relay_domains
smtpd_banner = $myhostname ESMTP $mail_name ($mail_version)
#local_destination_concurrency_limit = 2
#default_destination_concurrency_limit = 20
#virtual_alias_maps = mysql:/etc/postfix/mysql-virtual.cf
#sender_canonical_maps = mysql:/etc/postfix/mysql-canonical.cf
#smtpd_sasl_type = cyrus
#smtpd_sasl_auth_enable = yes
#smtpd_sasl_security_options = noanonymous
#smtpd_sasl_local_domain = $myhostname
#broken_sasl_auth_clients = yes
#smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
soft_bounce = yes
content_filter=amavis:[127.0.0.1]:10024
smtpd_helo_required = yes
mime_header_checks=pcre:/etc/postfix/body_checks
smtpd_recipient_restrictions =
reject_invalid_hostname,
reject_non_fqdn_hostname,
#reject_non_fqdn_sender,
#reject_non_fqdn_recipient,
#reject_unknown_sender_domain,
#reject_unknown_recipient_domain,
#reject_unauth_pipelining,
permit_mynetworks,
#permit_sasl_authenticated,
reject_unauth_destination
#reject_rbl_client zombie.dnsbl.sorbs.net,
#reject_rbl_client opm.blitzed.org,
#reject_rbl_client list.dsbl.org,
#reject_rbl_client sbl.spamhaus.org,
#permit
smtpd_helo_restrictions =
permit_mynetworks,
reject_invalid_hostname,
reject_non_fqdn_hostname
smtpd_client_restrictions =
permit_mynetworks,
reject_rbl_client ix.dnsbl.manitu.net,
reject_rbl_client zombie.dnsbl.sorbs.net,
reject_rbl_client list.dsbl.org,
reject_rbl_client sbl.spamhaus.org,
permit
Adjust the lookup-table /etc/postfix/transport to announce the destination:
my.domain smtp:192.168.xxx.xxx
To write the changes into the database, the following command should be executed:
postmap /etc/postfix/transport
Now restart Postfix:
/etc/init.d/postfix restart
Since Postfix is an extension and no standard on IPFire there is currently no log rotate configured for Postfix logs (they can be found under /var/log/mail ) which should be done subsequently. This prevents a fast increase of the mail logs.
The following lines should be deposit under /etc/logrotate.conf.
# Postfix
/var/log/mail {
weekly
rotate 4
copytruncate
compress
notifempty
missingok
}
Note! a backup of the original files are your best friend! ;-)
The installation can also be done over IPFires WUI via Pakfire. At this point there is for now nothing else to be done.
The installation of Amavis and SpamAssassin (which is a part of the Amavis installation) are provided also over Pakfire .
After installation of Amavis, the configuration file which is located under /etc/amavisd.conf should be adapted.
Content of amavisd.conf:
use strict;
# a minimalistic configuration file for amavisd-new with all necessary settings
#
# see amavisd.conf-default for a list of all variables with their defaults;
# see amavisd.conf-sample for a traditional-style commented file;
# for more details see documentation in INSTALL, README_FILES/*
# and at http://www.ijs.si/software/amavisd/amavisd-new-docs.html
# COMMONLY ADJUSTED SETTINGS:
# @bypass_virus_checks_maps = (
# %bypass_virus_checks, @bypass_virus_checks_acl, $bypass_virus_checks_re); # controls running of anti-virus code
#@bypass_spam_checks_maps = (
# %bypass_spam_checks, @bypass_spam_checks_acl, $bypass_spam_checks_re); # controls running of anti-spam code
# $bypass_decode_parts = 1; # controls running of decoders&dearchivers
$max_servers = 2; # num of pre-forked children (2..15 is common), -m
$daemon_user = 'amavis'; # (no default; customary: vscan or amavis), -u
$daemon_group = 'amavis'; # (no default; customary: vscan or amavis), -g
$mydomain = 'my.local.domain'; # a convenient default for other settings
# $MYHOME = '/var/amavis'; # a convenient default for other settings, -H
$TEMPBASE = "$MYHOME/tmp"; # working directory, needs to exist, -T
$ENV{TMPDIR} = $TEMPBASE; # environment variable TMPDIR, used by SA, etc.
$QUARANTINEDIR = '/var/virusmails'; # -Q
# $quarantine_subdir_levels = 1; # add level of subdirs to disperse quarantine
# $daemon_chroot_dir = $MYHOME; # chroot directory or undef, -R
# $db_home = "$MYHOME/db"; # dir for bdb nanny/cache/snmp databases, -D
# $helpers_home = "$MYHOME/var"; # working directory for SpamAssassin, -S
# $lock_file = "$MYHOME/var/amavisd.lock"; # -L
# $pid_file = "$MYHOME/var/amavisd.pid"; # -P
#NOTE: create directories $MYHOME/tmp, $MYHOME/var, $MYHOME/db manually
$log_level = 2; # verbosity 0..5, -d
$log_recip_templ = undef; # disable by-recipient level-0 log entries
$DO_SYSLOG = 1; # log via syslogd (preferred)
$syslog_facility = 'mail'; # Syslog facility as a string
# e.g.: mail, daemon, user, local0, ... local7
$syslog_priority = 'debug'; # Syslog base (minimal) priority as a string,
# choose from: emerg, alert, crit, err, warning, notice, info, debug
$enable_db = 1; # enable use of BerkeleyDB/libdb (SNMP and nanny)
$enable_global_cache = 1; # enable use of libdb-based cache if $enable_db=1
$nanny_details_level = 2; # nanny verbosity: 1: traditional, 2: detailed
@local_domains_maps = ( ".$mydomain" ); # list of all local domains
@mynetworks = qw( 127.0.0.0/8 10.0.0.0/8 172.16.xxx.xxx/12 192.168.xxx.xxx/16 );
$unix_socketname = "$MYHOME/amavisd.sock"; # amavisd-release or amavis-milter
# option(s) -p overrides $inet_socket_port and $unix_socketname
$inet_socket_port = 10024; # listen on this local TCP port(s)
# $inet_socket_port = [10024,10026]; # listen on multiple TCP ports
$policy_bank{'MYNETS'} = { # mail originating from @mynetworks
originating => 1, # is true in MYNETS by default, but let's make it explicit
os_fingerprint_method => undef, # don't query p0f for internal clients
};
# it is up to MTA to re-route mail from authenticated roaming users or
# from internal hosts to a dedicated TCP port (such as 10026) for filtering
$interface_policy{'10026'} = 'ORIGINATING';
$policy_bank{'ORIGINATING'} = { # mail supposedly originating from our users
originating => 1, # declare that mail was submitted by our smtp client
allow_disclaimers => 1, # enables disclaimer insertion if available
# notify administrator of locally originating malware
virus_admin_maps => ["virusalert\@$mydomain"],
spam_admin_maps => ["spamalert\@$mydomain"],
warnbadhsender => 1,
# forward to a smtpd service providing DKIM signing service
forward_method => 'smtp:[127.0.0.1]:10027',
# force MTA conversion to 7-bit (e.g. before DKIM signing)
smtpd_discard_ehlo_keywords => ['8BITMIME'],
bypass_banned_checks_maps => [1], # allow sending any file names and types
terminate_dsn_on_notify_success => 0, # don't remove NOTIFY=SUCCESS option
};
$interface_policy{'SOCK'} = 'AM.PDP-SOCK'; # only applies with $unix_socketname
# Use with amavis-release over a socket or with Petr Rehor's amavis-milter.c
# (with amavis-milter.c from this package or old amavis.c client use 'AM.CL'):
$policy_bank{'AM.PDP-SOCK'} = {
protocol => 'AM.PDP',
auth_required_release => 0, # do not require secret_id for amavisd-release
};
$sa_tag_level_deflt = undef; # 2.0 add spam info headers if at, or above that level
$sa_tag2_level_deflt = 4.2; # 6.2 add 'spam detected' headers at that level
$sa_kill_level_deflt = 6.9; # 6.9 triggers spam evasive actions (e.g. blocks mail)
$sa_dsn_cutoff_level = 18; # 10 spam level beyond which a DSN is not sent
# $sa_quarantine_cutoff_level = 25; # spam level beyond which quarantine is off
$penpals_bonus_score = 8; # (no effect without a @storage_sql_dsn database)
$penpals_threshold_high = $sa_kill_level_deflt; # don't waste time on hi spam
$sa_mail_body_size_limit = 400*1024; # don't waste time on SA if mail is larger
$sa_local_tests_only = 0; # only tests which do not require internet access?
$virus_admin = "virusalert\@$mydomain"; # notifications recip.
$mailfrom_notify_admin = "virusalert\@$mydomain"; # notifications sender
$mailfrom_notify_recip = "virusalert\@$mydomain"; # notifications sender
$mailfrom_notify_spamadmin = "spam.police\@$mydomain"; # notifications sender
$mailfrom_to_quarantine = ''; # null return path; uses original sender if undef
@addr_extension_virus_maps = ('virus');
@addr_extension_banned_maps = ('banned');
@addr_extension_spam_maps = ('spam');
@addr_extension_bad_header_maps = ('badh');
# $recipient_delimiter = '+'; # undef disables address extensions altogether
# when enabling addr extensions do also Postfix/main.cf: recipient_delimiter=+
$path = '/usr/local/sbin:/usr/local/bin:/usr/sbin:/sbin:/usr/bin:/bin';
# $dspam = 'dspam';
$MAXLEVELS = 14;
$MAXFILES = 1500;
$MIN_EXPANSION_QUOTA = 100*1024; # bytes (default undef, not enforced)
$MAX_EXPANSION_QUOTA = 300*1024*1024; # bytes (default undef, not enforced)
$sa_spam_subject_tag = '***SPAM*** ';
$defang_virus = 1; # MIME-wrap passed infected mail
$defang_banned = 1; # MIME-wrap passed mail containing banned name
# for defanging bad headers only turn on certain minor contents categories:
$defang_by_ccat{+CC_BADH.",3"} = 1; # NUL or CR character in header
$defang_by_ccat{+CC_BADH.",5"} = 1; # header line longer than 998 characters
$defang_by_ccat{+CC_BADH.",6"} = 1; # header field syntax error
# OTHER MORE COMMON SETTINGS (defaults may suffice):
$myhostname = 'my.ipfire.local'; # must be a fully-qualified domain name!
# $notify_method = 'smtp:[127.0.0.1]:10025';
# $forward_method = 'smtp:[127.0.0.1]:10025'; # set to undef with milter!
$final_virus_destiny = D_DISCARD;
$final_banned_destiny = D_BOUNCE;
$final_spam_destiny = D_PASS;
$final_bad_header_destiny = D_PASS;
# Notify virus sender? Bloß nicht!
$warnvirussender = 0;
# Notify spam sender? Bloß nicht!
$warnspamsender = 0;
# Notify sender of banned files? Kann man machen.
$warnbannedsender = 0;
# Notify sender of syntactically invalid header containing non-ASCII characters? Bloß nicht!
#$warnbadsender = 0;
# Notify virus (or banned files) RECIPIENT? Wie man möchte, ich finde es sinnvoll.
$warnvirusrecip = 1;
$warnbannedrecip = 1;
$warnbadhrecip = 1;
# SOME OTHER VARIABLES WORTH CONSIDERING (see amavisd.conf-default for all)
# $warnbadhsender,
# $warnvirusrecip, $warnbannedrecip, $warnbadhrecip, (or @warn*recip_maps)
# @bypass_virus_checks_maps, @bypass_spam_checks_maps,
# @bypass_banned_checks_maps, @bypass_header_checks_maps,
# @virus_lovers_maps, @spam_lovers_maps,
# @banned_files_lovers_maps, @bad_header_lovers_maps,
#
# @blacklist_sender_maps, @score_sender_maps,
#
# $clean_quarantine_method, $virus_quarantine_to, $banned_quarantine_to,
# $bad_header_quarantine_to, $spam_quarantine_to,
#
# $defang_bad_header, $defang_undecipherable, $defang_spam
# REMAINING IMPORTANT VARIABLES ARE LISTED HERE BECAUSE OF LONGER ASSIGNMENTS
@keep_decoded_original_maps = (new_RE(
# qr'^MAIL$', # retain full original message for virus checking (can be slow)
qr'^MAIL-UNDECIPHERABLE$', # recheck full mail if it contains undecipherables
qr'^(ASCII(?! cpio)|text|uuencoded|xxencoded|binhex)'i,
# qr'^Zip archive data', # don't trust Archive::Zip
));
# for $banned_namepath_re (a new-style of banned table) see amavisd.conf-sample
$banned_filename_re = new_RE(
### BLOCKED ANYWHERE
# qr'^UNDECIPHERABLE$', # is or contains any undecipherable components
qr'^\.(exe-ms|dll)$', # banned file(1) types, rudimentary
# qr'^\.(exe|lha|tnef|cab|dll)$', # banned file(1) types
### BLOCK THE FOLLOWING, EXCEPT WITHIN UNIX ARCHIVES:
# [ qr'^\.(gz|bz2)$' => 0 ], # allow any in gzip or bzip2
[ qr'^\.(rpm|cpio|tar)$' => 0 ], # allow any in Unix-type archives
qr'.\.(pif|scr)$'i, # banned extensions - rudimentary
# qr'^\.zip$', # block zip type
### BLOCK THE FOLLOWING, EXCEPT WITHIN ARCHIVES:
# [ qr'^\.(zip|rar|arc|arj|zoo)$'=> 0 ], # allow any within these archives
qr'^application/x-msdownload$'i, # block these MIME types
qr'^application/x-msdos-program$'i,
qr'^application/hta$'i,
# qr'^message/partial$'i, # rfc2046 MIME type
# qr'^message/external-body$'i, # rfc2046 MIME type
# qr'^(application/x-msmetafile|image/x-wmf)$'i, # Windows Metafile MIME type
# qr'^\.wmf$', # Windows Metafile file(1) type
# block certain double extensions in filenames
qr'\.[^./]*[A-Za-z][^./]*\.\s*(exe|vbs|pif|scr|bat|cmd|com|cpl|dll)[.\s]*$'i,
# qr'\{[0-9a-f]{8}(-[0-9a-f]{4}){3}-[0-9a-f]{12}\}?'i, # Class ID CLSID, strict
# qr'\{[0-9a-z]{4,}(-[0-9a-z]{4,}){0,7}\}?'i, # Class ID extension CLSID, loose
qr'.\.(exe|vbs|pif|scr|cpl)$'i, # banned extension - basic
# qr'.\.(exe|vbs|pif|scr|cpl|bat|cmd|com)$'i, # banned extension - basic+cmd
# qr'.\.(ade|adp|app|bas|bat|chm|cmd|com|cpl|crt|emf|exe|fxp|grp|hlp|hta|
# inf|ins|isp|js|jse|lnk|mda|mdb|mde|mdw|mdt|mdz|msc|msi|msp|mst|
# ops|pcd|pif|prg|reg|scr|sct|shb|shs|vb|vbe|vbs|
# wmf|wsc|wsf|wsh)$'ix, # banned ext - long
# qr'.\.(ani|cur|ico)$'i, # banned cursors and icons filename
# qr'^\.ani$', # banned animated cursor file(1) type
# qr'.\.(mim|b64|bhx|hqx|xxe|uu|uue)$'i, # banned extension - WinZip vulnerab.
);
# See http://support.microsoft.com/default.aspx?scid=kb;EN-US;q262631
# and http://www.cknow.com/vtutor/vtextensions.htm
# ENVELOPE SENDER SOFT-WHITELISTING / SOFT-BLACKLISTING
@score_sender_maps = ({ # a by-recipient hash lookup table,
# results from all matching recipient tables are summed
# ## per-recipient personal tables (NOTE: positive: black, negative: white)
# 'user1@example.com' => [{'bla-mobile.press@example.com' => 10.0}],
# 'user3@example.com' => [{'.ebay.com' => -3.0}],
# 'user4@example.com' => [{'cleargreen@cleargreen.com' => -7.0,
# '.cleargreen.com' => -5.0}],
## site-wide opinions about senders (the '.' matches any recipient)
'.' => [ # the _first_ matching sender determines the score boost
new_RE( # regexp-type lookup table, just happens to be all soft-blacklist
[qr'^(bulkmail|offers|cheapbenefits|earnmoney|foryou)@'i => 5.0],
[qr'^(greatcasino|investments|lose_weight_today|market\.alert)@'i=> 5.0],
[qr'^(money2you|MyGreenCard|new\.tld\.registry|opt-out|opt-in)@'i=> 5.0],
[qr'^(optin|saveonlsmoking2002k|specialoffer|specialoffers)@'i => 5.0],
[qr'^(stockalert|stopsnoring|wantsome|workathome|yesitsfree)@'i => 5.0],
[qr'^(your_friend|greatoffers)@'i => 5.0],
[qr'^(inkjetplanet|marketopt|MakeMoney)\d*@'i => 5.0],
),
# read_hash("/var/amavis/sender_scores_sitewide"),
{ # a hash-type lookup table (associative array)
'nobody@cert.org' => -3.0,
'cert-advisory@us-cert.gov' => -3.0,
'owner-alert@iss.net' => -3.0,
'slashdot@slashdot.org' => -3.0,
'securityfocus.com' => -3.0,
'ntbugtraq@listserv.ntbugtraq.com' => -3.0,
'security-alerts@linuxsecurity.com' => -3.0,
'mailman-announce-admin@python.org' => -3.0,
'amavis-user-admin@lists.sourceforge.net'=> -3.0,
'amavis-user-bounces@lists.sourceforge.net' => -3.0,
'spamassassin.apache.org' => -3.0,
'notification-return@lists.sophos.com' => -3.0,
'owner-postfix-users@postfix.org' => -3.0,
'owner-postfix-announce@postfix.org' => -3.0,
'owner-sendmail-announce@lists.sendmail.org' => -3.0,
'sendmail-announce-request@lists.sendmail.org' => -3.0,
'donotreply@sendmail.org' => -3.0,
'ca+envelope@sendmail.org' => -3.0,
'noreply@freshmeat.net' => -3.0,
'owner-technews@postel.acm.org' => -3.0,
'ietf-123-owner@loki.ietf.org' => -3.0,
'cvs-commits-list-admin@gnome.org' => -3.0,
'rt-users-admin@lists.fsck.com' => -3.0,
'clp-request@comp.nus.edu.sg' => -3.0,
'surveys-errors@lists.nua.ie' => -3.0,
'emailnews@genomeweb.com' => -5.0,
'yahoo-dev-null@yahoo-inc.com' => -3.0,
'returns.groups.yahoo.com' => -3.0,
'clusternews@linuxnetworx.com' => -3.0,
lc('lvs-users-admin@LinuxVirtualServer.org') => -3.0,
lc('owner-textbreakingnews@CNNIMAIL12.CNN.COM') => -5.0,
# soft-blacklisting (positive score)
'sender@example.net' => 3.0,
'.example.net' => 1.0,
},
], # end of site-wide tables
});
@decoders = (
['mail', \&do_mime_decode],
['asc', \&do_ascii],
['uue', \&do_ascii],
['hqx', \&do_ascii],
['ync', \&do_ascii],
['F', \&do_uncompress, ['unfreeze','freeze -d','melt','fcat'] ],
['Z', \&do_uncompress, ['uncompress','gzip -d','zcat'] ],
['gz', \&do_uncompress, 'gzip -d'],
['gz', \&do_gunzip],
['bz2', \&do_uncompress, 'bzip2 -d'],
['lzo', \&do_uncompress, 'lzop -d'],
['rpm', \&do_uncompress, ['rpm2cpio.pl','rpm2cpio'] ],
['cpio', \&do_pax_cpio, ['pax','gcpio','cpio'] ],
['tar', \&do_pax_cpio, ['pax','gcpio','cpio'] ],
['deb', \&do_ar, 'ar'],
# ['a', \&do_ar, 'ar'], # unpacking .a seems an overkill
['zip', \&do_unzip],
['7z', \&do_7zip, ['7zr','7za','7z'] ],
['rar', \&do_unrar, ['rar','unrar'] ],
['arj', \&do_unarj, ['arj','unarj'] ],
['arc', \&do_arc, ['nomarch','arc'] ],
['zoo', \&do_zoo, ['zoo','unzoo'] ],
['lha', \&do_lha, 'lha'],
# ['doc', \&do_ole, 'ripole'],
['cab', \&do_cabextract, 'cabextract'],
['tnef', \&do_tnef_ext, 'tnef'],
['tnef', \&do_tnef],
# ['sit', \&do_unstuff, 'unstuff'], # broken/unsafe decoder
['exe', \&do_executable, ['rar','unrar'], 'lha', ['arj','unarj'] ],
);
@av_scanners = (
# ### http://www.clamav.net/
['ClamAV-clamd',
\&ask_daemon, ["CONTSCAN {}\n", "/var/run/clamav/clamd"],
qr/\bOK$/, qr/\bFOUND$/,
qr/^.*?: (?!Infected Archive)(.*) FOUND$/ ],
# # NOTE: run clamd under the same user as amavisd, or run it under its own
# # uid such as clamav, add user clamav to the amavis group, and then add
# # AllowSupplementaryGroups to clamd.conf;
# # NOTE: match socket name (LocalSocket) in clamav.conf to the socket name in
# # this entry; when running chrooted one may prefer socket "$MYHOME/clamd".
# ### http://www.f-prot.com/
# ['FRISK F-Prot Daemon',
# \&ask_daemon,
# ["GET {}/*?-dumb%20-archive%20-packed HTTP/1.0\r\n\r\n",
# ['127.0.0.1:10200','127.0.0.1:10201','127.0.0.1:10202',
# '127.0.0.1:10203','127.0.0.1:10204'] ],
# qr/(?i)<summary[^>]*>clean<\/summary>/,
# qr/(?i)<summary[^>]*>infected<\/summary>/,
# qr/(?i)<name>(.+)<\/name>/ ],
### http://www.kaspersky.com/ (kav4mailservers)
['KasperskyLab AVP - aveclient',
['/usr/local/kav/bin/aveclient','/usr/local/share/kav/bin/aveclient',
'/opt/kav/5.5/kav4mailservers/bin/aveclient','aveclient'],
'-p /var/run/aveserver -s {}/*',
[0,3,6,8], qr/\b(INFECTED|SUSPICION|SUSPICIOUS)\b/,
qr/(?:INFECTED|WARNING|SUSPICION|SUSPICIOUS) (.+)/,
],
# NOTE: one may prefer [0],[2,3,4,5], depending on how suspicious,
# currupted or protected archives are to be handled
### http://www.avira.com/
### Avira AntiVir (formerly H+BEDV) or (old) CentralCommand Vexira Antivirus
['Avira AntiVir', ['antivir','vexira'],
'--allfiles -noboot -nombr -rs -s -z {}', [0], qr/ALERT:|VIRUS:/,
qr/(?x)^\s* (?: ALERT: \s* (?: \[ | [^']* ' ) |
(?i) VIRUS:\ .*?\ virus\ '?) ( [^\]\s']+ )/ ],
# NOTE: if you only have a demo version, remove -z and add 214, as in:
# '--allfiles -noboot -nombr -rs -s {}', [0,214], qr/ALERT:|VIRUS:/,
# ### http://www.avast.com/
# ['avast! Antivirus daemon',
# \&ask_daemon, # greets with 220, terminate with QUIT
# ["SCAN {}\015\012QUIT\015\012", '/var/run/avast4/mailscanner.sock'],
# qr/\t\[\+\]/, qr/\t\[L\]\t/, qr/\t\[L\]\t([^[ \t\015\012]+)/ ],
# ### http://www.avast.com/
# ['avast! Antivirus - Client/Server Version', 'avastlite',
# '-a /var/run/avast4/mailscanner.sock -n {}', [0], [1],
# qr/\t\[L\]\t([^[ \t\015\012]+)/ ],
### http://www.avast.com/
['avast! Antivirus', ['/usr/bin/avastcmd','avastcmd'],
'-a -i -n -t=A {}', [0], [1], qr/\binfected by:\s+([^ \t\n\[\]]+)/ ],
### http://www.bitdefender.com/
['BitDefender', 'bdc',
'--arc --mail {}', qr/^Infected files *:0+(?!\d)/,
qr/^(?:Infected files|Identified viruses|Suspect files) *:0*[1-9]/,
qr/(?:suspected|infected): (.*)(?:\033|$)/ ],
# consider also: --all --nowarn --alev=15 --flev=15. The --all argument may
# not apply to your version of bdc, check documentation and see 'bdc --help'
);
@av_scanners_backup = (
### http://www.clamav.net/ - backs up clamd or Mail::ClamAV
['ClamAV-clamscan', 'clamscan',
"--stdout --no-summary -r --tempdir=$TEMPBASE {}",
[0], qr/:.*\sFOUND$/, qr/^.*?: (?!Infected Archive)(.*) FOUND$/ ],
### http://www.f-prot.com/ - backs up F-Prot Daemon
['FRISK F-Prot Antivirus', ['f-prot','f-prot.sh'],
'-dumb -archive -packed {}', [0,8], [3,6], # or: [0], [3,6,8],
qr/(?:Infection:|security risk named) (.+)|\s+contains\s+(.+)$/ ],
### http://www.kaspersky.com/
['Kaspersky Antivirus v5.5',
['/opt/kaspersky/kav4fs/bin/kav4fs-kavscanner',
'/opt/kav/5.5/kav4unix/bin/kavscanner',
'/opt/kav/5.5/kav4mailservers/bin/kavscanner', 'kavscanner'],
'-i0 -xn -xp -mn -R -ePASBME {}/*', [0,10,15], [5,20,21,25],
qr/(?:INFECTED|WARNING|SUSPICION|SUSPICIOUS) (.*)/ ,
# sub {chdir('/opt/kav/bin') or die "Can't chdir to kav: $!"},
# sub {chdir($TEMPBASE) or die "Can't chdir back to $TEMPBASE $!"},
],
# always succeeds (uncomment to consider mail clean if all other scanners fail)
# ['always-clean', sub {0}],
);
1; # insure a defined return
It is important that ClamAV uses the correct path, which will be checked in here:
$myhostname = 'ipfire.localdomain'; # must be a fully-qualified domain name!
# ### http://www.clamav.net/
['ClamAV-clamd',
\&ask_daemon, ["CONTSCAN {}\n", "/var/run/clamav/clamd"],
qr/\bOK$/, qr/\bFOUND$/,
qr/^.*?: (?!Infected Archive)(.*) FOUND$/ ],
Amavis should have the correct permission for ClamAV:
# usermod -a -G clamav amavis # usermod -a -G clamav clamav # usermod -a -G amavis clamav # usermod -a -G amavis amavis
Spamassassins configuration file are located under /var/ipfire/mail/spamassassin/ in here the following values can be changed if needed:
# This is the right place to customize your installation of SpamAssassin. # # See 'perldoc Mail::SpamAssassin::Conf' for details of what can be # tweaked. # # Only a small subset of options are listed below # ########################################################################### # add_header all Report _REPORT_ # Add *****SPAM***** to the Subject header of spam e-mails # rewrite_header Subject *****SPAM***** # Save spam messages as a message/rfc822 MIME attachment instead of # modifying the original message (0: off, 2: use text/plain instead) # report_safe 1 # Set which networks or hosts are considered 'trusted' by your mail # server (i.e. not spammers) # trusted_networks 192.168.xxx. # Set file-locking method (flock is not safe over NFS, but is faster) # # lock_method flock # Set the threshold at which a message is considered spam (default: 5.0) # required_score 5.0 # Use Bayesian classifier (default: 1) # use_bayes 1 # Bayesian classifier auto-learning (default: 1) # bayes_auto_learn 1 # Set headers which may provide inappropriate cues to the Bayesian # classifier # bayes_ignore_header X-Bogosity bayes_ignore_header X-Spam-Flag bayes_ignore_header X-Spam-Status
To prevent a high amount of temporary files and directories produced by Amavis, the documentation of Amavisd-new recommends to delete dispensable data from time to time.
The following command are an advice for doing this:
find /var/amavis -type d -name 'amavis-20??????T*' ` -prune -mtime +1 -exec rm -rf {} \;`
While executing this command, amavisd should be deactivated.
This can also be integrated for example in the START|STOP routines (init script) of Amavis. For this, the following lines can be used in /etc/init.d/amavis.d.
Note! It should be another time said: A backup of the file are your best friend ;-)
#!/bin/sh
########################################################################
# Begin $rc_base/init.d/amavisd
#
# Description : Amavisd Init Script
#
# Authors : Michael Tremer (ms@ipfire.org)
#
# Version : 01.00
#
# Notes :
#
########################################################################
. /etc/sysconfig/rc
. ${rc_functions}
case "${1}" in
start)
boot_mesg "Starting AMaViS Daemon..."
find /var/amavis/tmp -type d -name 'amavis-20??????T*' \
-prune -mtime +1 -exec rm -rf {} \;
loadproc /usr/bin/amavisd
;;
stop)
boot_mesg "Stopping AMaViS Daemon..."
killproc /usr/bin/amavisd
;;
restart)
${0} stop
sleep 1
${0} start
;;
status)
statusproc /usr/bin/amavisd
;;
*)
echo "Usage: ${0} {start|stop|restart|status}"
exit 1
;;
esac
iptables -A CUSTOMINPUT -p tcp -s 0/0 --sport 1024:65535 -d 192.168.ip.red0 --dport 25 -m state --state NEW,ESTABLISHED -j ACCEPT
For a automatic START|STOP|RESTART of SpamAssassin and Amavis, you can set the following symlinks:
ln -s ../init.d/amavisd /etc/rc.d/rc3.d/S38amavisd ln -s ../init.d/spamassassin /etc/rc.d/rc3.d/S38spamassassin ln -s ../init.d/amavisd /etc/rc.d/rc0.d/K25amavisd ln -s ../init.d/amavisd /etc/rc.d/rc6.d/K25amavisd ln -s ../init.d/spamassassin /etc/rc.d/rc0.d/K25spamassassin ln -s ../init.d/spamassassin /etc/rc.d/rc6.d/K25spamassassin
First, thanks to botribun for his hint.
Here, you have the possibility to connect the mail proxy against an LDAP to generate a receiver list.
Thereby, the mailsystem can be relieved and a NDR can be prevented. It is your own decision if you'd like to implement this feature.
The following Perl script can be used for this, also an appropriate cronjob should be applied, which updates this list in a configured time.
Integrate the following line in /etc/postfix/main.cf (or remove # if the directives are already present):
relay_recipient_maps = hash:/etc/postfix/relay_recipients
Now integrate the script and adapt it to your needs.
file = getadsmtp.pl
#!/usr/bin/perl -T -w
# Version 1.02
# This script will pull all users' SMTP addresses from your Active Directory
# (including primary and secondary email addresses) and list them in the
# format "user@example.com OK" which Postfix uses with relay_recipient_maps.
# Be sure to double-check the path to perl above.
# This requires Net::LDAP to be installed. To install Net::LDAP, at a shell
# type "perl -MCPAN -e shell" and then "install Net::LDAP"
use Net::LDAP;
use Net::LDAP::Control::Paged;
use Net::LDAP::Constant ( "LDAP_CONTROL_PAGED" );
# Enter the path/file for the output
$VALID = "/etc/postfix/transport_maps";
# Enter the FQDN of your Active Directory domain controllers below
$dc1="10.10.10.2";
$dc2="10.10.10.3";
# Enter the LDAP container for your userbase.
# The syntax is CN=Users,dc=example,dc=com
# This can be found by installing the Windows 2000 Support Tools
# then running ADSI Edit.
# In ADSI Edit, expand the "Domain NC [domaincontroller1.example.com]" &
# you will see, for example, DC=example,DC=com (this is your base).
# The Users Container will be specified in the right pane as
# CN=Users depending on your schema (this is your container).
# You can double-check this by clicking "Properties" of your user
# folder in ADSI Edit and examining the "Path" value, such as:
# LDAP://domaincontroller1.example.com/CN=Users,DC=example,DC=com
# which would be $hqbase="cn=Users,dc=example,dc=com"
# Note: You can also use just $hqbase="dc=example,dc=com"
$hqbase="dc=DOMAIN,dc=LOCAL";
# Enter the username & password for a valid user in your Active Directory
# with username in the form cn=username,cn=Users,dc=example,dc=com
# Make sure the user's password does not expire. Note that this user
# does not require any special privileges.
# You can double-check this by clicking "Properties" of your user in
# ADSI Edit and examining the "Path" value, such as:
# LDAP://domaincontroller1.example.com/CN=user,CN=Users,DC=example,DC=com
# which would be $user="cn=user,cn=Users,dc=example,dc=com"
# Note: You can also use the UPN login: "user\@example.com"
$user="USER\@DOAMIN.LOCAL";
$passwd="USERPW";
# Connecting to Active Directory domain controllers
$noldapserver=0;
$ldap = Net::LDAP->new($dc1) or
$noldapserver=1;
if ($noldapserver == 1) {
$ldap = Net::LDAP->new($dc2) or
die "Error connecting to specified domain controllers $@ \n";
}
$mesg = $ldap->bind ( dn => $user,
password =>$passwd);
if ( $mesg->code()) {
die ("error:", $mesg->code(),"\n","error name: ",$mesg->error_name(),
"\n", "error text: ",$mesg->error_text(),"\n");
}
# How many LDAP query results to grab for each paged round
# Set to under 1000 for Active Directory
$page = Net::LDAP::Control::Paged->new( size => 990 );
@args = ( base => $hqbase,
# Play around with this to grab objects such as Contacts, Public Folders, etc.
# A minimal filter for just users with email would be:
# filter => "(&(sAMAccountName=*)(mail=*))"
filter => "(& (mailnickname=*) (| (&(objectCategory=person)
(objectClass=user)(!(homeMDB=*))(!(msExchHomeServerName=*)))
(&(objectCategory=person)(objectClass=user)(|(homeMDB=*)
(msExchHomeServerName=*)))(&(objectCategory=person)(objectClass=contact))
(objectCategory=group)(objectCategory=publicFolder)(objectClass=msExchDynamicDistributionList) ))",
control => [ $page ],
attrs => [ "proxyAddresses" ],
);
my $cookie;
while(1) {
# Perform search
my $mesg = $ldap->search( @args );
# Filtering results for proxyAddresses attributes
foreach my $entry ( $mesg->entries ) {
my $name = $entry->get_value( "cn" );
# LDAP Attributes are multi-valued, so we have to print each one.
foreach my $mail ( $entry->get_value( "proxyAddresses" ) ) {
# Test if the Line starts with one of the following lines:
# proxyAddresses: [smtp|SMTP]:
# and also discard this starting string, so that $mail is only the
# address without any other characters...
if ( $mail =~ s/^(smtp|SMTP)://gs ) {
push(@valid, $mail." OK\n");
}
}
}
# Only continue on LDAP_SUCCESS
$mesg->code and last;
# Get cookie from paged control
my($resp) = $mesg->control( LDAP_CONTROL_PAGED ) or last;
$cookie = $resp->cookie or last;
# Set cookie in paged control
$page->cookie($cookie);
}
if ($cookie) {
# We had an abnormal exit, so let the server know we do not want any more
$page->cookie($cookie);
$page->size(0);
$ldap->search( @args );
# Also would be a good idea to die unhappily and inform OP at this point
die("LDAP query unsuccessful");
}
# Only write the file once the query is successful
open VALID, ">$VALID" or die "CANNOT OPEN $VALID $!";
print VALID @valid;
# Add additional restrictions, users, etc. to the output file below.
#print VALID "user\@example.com OK\n";
#print VALID "user1\@example.com 550 User unknown.\n";
#print VALID "bad.example.com 550 User does not exist.\n";
close VALID;
Prepare the cronjob with the following script which also writes the LDAP list into a database while execution.
file = update-relay-recipients.sh
#!/bin/sh /etc/postfix/getadsmtp.pl cd /etc/postfix postmap relay_recipients
to execute it continuously, apply the cronjob by typing:
fcrontab -e
List the queue:
mailq | cat
Delete mail in queue with the corresponding Mail-ID:
postsuper -d 38A9580045
Older Revisions • December 23 at 2:51 am • Jon