Virtual Users And Domains With Postfix, Courier And MySQL (Fedora Core 5) - Page 3

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Submitted by falko (Contact Author) (Forums) on Sun, 2006-09-10 09:14. ::

10 Install Amavisd-new, SpamAssassin And ClamAV

To install amavisd-new, spamassassin and clamav, run the following command:

yum install amavisd-new spamassassin clamav clamav-data clamav-server clamav-update unzip bzip2 unrar

Now we must edit /etc/amavisd/amavisd.conf.

vi /etc/amavisd/amavisd.conf

In this file we change five places:

1) Change

$mydomain = 'example.com';   # a convenient default for other settings

to

########################
$mydomain = 'localhost';
########################
#$mydomain = 'example.com';   # a convenient default for other settings

2) Change

$sa_tag_level_deflt  = 2.0;  # add spam info headers if at, or above that level
$sa_tag2_level_deflt = 6.31; # add 'spam detected' headers at that level
$sa_kill_level_deflt = 6.31; # triggers spam evasive actions
$sa_dsn_cutoff_level = 10;   # spam level beyond which a DSN is not sent

to

########################
$sa_tag_level_deflt  = 2.0;  # add spam info headers if at, or above that level
$sa_tag2_level_deflt = 4.0; # add 'spam detected' headers at that level
$sa_kill_level_deflt = $sa_tag2_level_deflt; # triggers spam evasive actions
$sa_dsn_cutoff_level = 10;   # spam level beyond which a DSN is not sent
########################

(Of course, you can adjust the spam scores to your liking.)

3) Change

# @lookup_sql_dsn =
#   ( ['DBI:mysql:database=mail;host=127.0.0.1;port=3306', 'user1', 'passwd1'],
#     ['DBI:mysql:database=mail;host=host2', 'username2', 'password2'],
#     ["DBI:SQLite:dbname=$MYHOME/sql/mail_prefs.sqlite", '', ''] );
# @storage_sql_dsn = @lookup_sql_dsn;  # none, same, or separate database

to

# @lookup_sql_dsn =
#   ( ['DBI:mysql:database=mail;host=127.0.0.1;port=3306', 'user1', 'passwd1'],
#     ['DBI:mysql:database=mail;host=host2', 'username2', 'password2'],
#     ["DBI:SQLite:dbname=$MYHOME/sql/mail_prefs.sqlite", '', ''] );

########################
@lookup_sql_dsn =
   ( ['DBI:mysql:database=mail;host=127.0.0.1;port=3306', 'mail_admin', 'mail_admin_password'] );

$sql_select_policy = 'SELECT "Y" as local FROM domains WHERE CONCAT("@",domain) IN (%k)';

$sql_select_white_black_list = undef;  # undef disables SQL white/blacklisting

$recipient_delimiter = '+';                # (default is '+')

$replace_existing_extension = 1;        # (default is false)

$localpart_is_case_sensitive = 0;        # (default is false)
########################

# @storage_sql_dsn = @lookup_sql_dsn;  # none, same, or separate database

(Make sure you fill in the correct database details!)

4) Change

# $recipient_delimiter = '+';  # undef disables address extensions altogether
# when enabling addr extensions do also Postfix/main.cf: recipient_delimiter=+

to

########################
$recipient_delimiter = undef;  # undef disables address extensions altogether
# when enabling addr extensions do also Postfix/main.cf: recipient_delimiter=+
########################

5) Change

$final_virus_destiny      = D_DISCARD;
$final_banned_destiny     = D_BOUNCE;
$final_spam_destiny       = D_DISCARD;
$final_bad_header_destiny = D_BOUNCE;

to

########################
$final_virus_destiny      = D_REJECT;
$final_banned_destiny     = D_REJECT;
$final_spam_destiny       = D_PASS;
$final_bad_header_destiny = D_PASS;
########################

(Of course, it's up to you to decide what should happen with spam and viruses. I decide to accept spam (D_PASS) so that Spam can be filtered in my email client with a simple filter rule (based on the subject that gets rewritten by amavisd-new if it thinks a mail is spam). The allowed actions (D_PASS, D_DISCARD, D_BOUNCE, and D_REJECT) are explained here: http://www.ijs.si/software/amavisd/amavisd-new-docs.html#actions)

After my changes, /etc/amavisd/amavisd.conf looks like this:

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 = (1);  # uncomment to DISABLE anti-virus code
# @bypass_spam_checks_maps  = (1);  # uncomment to DISABLE anti-spam code

$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

########################
$mydomain = 'localhost';
########################
#$mydomain = 'example.com';   # a convenient default for other settings

$MYHOME = '/var/spool/amavisd';   # a convenient default for other settings, -H
$TEMPBASE = "$MYHOME/tmp";   # working directory, needs to exist, -T
$ENV{TMPDIR} = $TEMPBASE;    # environment variable TMPDIR
$QUARANTINEDIR = undef;      # -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 = "/var/run/amavisd/amavisd.lock";  # -L
$pid_file  = "/var/run/amavisd/amavisd.pid";   # -P
#NOTE: create directories $MYHOME/tmp, $MYHOME/var, $MYHOME/db manually

@local_domains_maps = ( [".$mydomain"] );
# @mynetworks = qw( 127.0.0.0/8 [::1] [FE80::]/10 [FEC0::]/10
#                   10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 );

$log_level = 0;              # 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

$inet_socket_port = 10024;   # listen on this local TCP port(s) (see $protocol)
$unix_socketname = "$MYHOME/amavisd.sock";  # amavisd-release or amavis-milter
                # option(s) -p overrides $inet_socket_port and $unix_socketname

$interface_policy{'SOCK'}='AM.PDP-SOCK';  # only relevant 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' };

########################
$sa_tag_level_deflt  = 2.0;  # add spam info headers if at, or above that level
$sa_tag2_level_deflt = 4.0; # add 'spam detected' headers at that level
$sa_kill_level_deflt = $sa_tag2_level_deflt; # triggers spam evasive actions
$sa_dsn_cutoff_level = 10;   # spam level beyond which a DSN is not sent
########################
# $sa_quarantine_cutoff_level = 20; # spam level beyond which quarantine is off
# $penpals_bonus_score = 4;  # (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 = 512*1024; # don't waste time on SA if mail is larger
$sa_local_tests_only = 0;    # only tests which do not require internet access?

# @lookup_sql_dsn =
#   ( ['DBI:mysql:database=mail;host=127.0.0.1;port=3306', 'user1', 'passwd1'],
#     ['DBI:mysql:database=mail;host=host2', 'username2', 'password2'],
#     ["DBI:SQLite:dbname=$MYHOME/sql/mail_prefs.sqlite", '', ''] );

########################
@lookup_sql_dsn =

   ( ['DBI:mysql:database=mail;host=127.0.0.1;port=3306', 'mail_admin', 'mail_admin_password'] );

$sql_select_policy = 'SELECT "Y" as local FROM domains WHERE CONCAT("@",domain) IN (%k)';

$sql_select_white_black_list = undef;  # undef disables SQL white/blacklisting

$recipient_delimiter = '+';                # (default is '+')

$replace_existing_extension = 1;        # (default is false)

$localpart_is_case_sensitive = 0;        # (default is false)
########################

# @storage_sql_dsn = @lookup_sql_dsn;  # none, same, or separate database

# $timestamp_fmt_mysql = 1; # if using MySQL *and* msgs.time_iso is TIMESTAMP;
#   defaults to 0, which is good for non-MySQL or if msgs.time_iso is CHAR(16)

$virus_admin               = undef;                    # notifications recip.

$mailfrom_notify_admin     = undef;                    # notifications sender
$mailfrom_notify_recip     = undef;                    # notifications sender
$mailfrom_notify_spamadmin = undef;                    # notifications sender
$mailfrom_to_quarantine = ''; # null return path; uses original sender if undef

@addr_extension_virus_maps      = ('virus');
@addr_extension_spam_maps       = ('spam');
@addr_extension_banned_maps     = ('banned');
@addr_extension_bad_header_maps = ('badh');
########################
$recipient_delimiter = undef;  # 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


# OTHER MORE COMMON SETTINGS (defaults may suffice):

# $myhostname = 'host.example.com';  # 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_REJECT;
$final_banned_destiny     = D_REJECT;
$final_spam_destiny       = D_PASS;
$final_bad_header_destiny = D_PASS;
########################

# $os_fingerprint_method = 'p0f:127.0.0.1:2345';  # to query p0f-analyzer.pl

## hierarchy by which a final setting is chosen:
##   policy bank (based on port or IP address) -> *_by_ccat
##   *_by_ccat (based on mail contents) -> *_maps
##   *_maps (based on recipient address) -> final configuration value


# 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

$banned_filename_re = new_RE(
# qr'^UNDECIPHERABLE$',  # is or contains any undecipherable components

  # block certain double extensions anywhere in the base name
  qr'\.[^./]*[A-Za-z][^./]*\.(exe|vbs|pif|scr|bat|cmd|com|cpl|dll)\.?$'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'^application/x-msdownload$'i,                  # block these MIME types
  qr'^application/x-msdos-program$'i,
  qr'^application/hta$'i,

# qr'^(application/x-msmetafile|image/x-wmf)$'i,    # Windows Metafile MIME
# qr'^\.wmf$',                            # Windows Metafile file(1) type

# qr'^message/partial$'i,         # rfc2046 MIME type
# qr'^message/external-body$'i,   # rfc2046 MIME type

# [ qr'^\.(Z|gz|bz2)$'           => 0 ],  # allow any in Unix-compressed
  [ qr'^\.(rpm|cpio|tar)$'       => 0 ],  # allow any in Unix-type archives
# [ qr'^\.(zip|rar|arc|arj|zoo)$'=> 0 ],  # allow any within such archives

  qr'.\.(exe|vbs|pif|scr|bat|cmd|com|cpl)$'i, # banned extension - basic
# qr'.\.(ade|adp|app|bas|bat|chm|cmd|com|cpl|crt|emf|exe|fxp|grp|hlp|hta|
#        inf|ins|isp|js|jse|lnk|mda|mdb|mde|mdw|mdt|mdz|msc|msi|msp|mst|
#        ops|pcd|pif|prg|reg|scr|sct|shb|shs|vb|vbe|vbs|
#        wmf|wsc|wsf|wsh)$'ix,  # banned ext - long

# qr'.\.(mim|b64|bhx|hqx|xxe|uu|uue)$'i,  # banned extension - WinZip vulnerab.

  qr'^\.(exe-ms)$',                       # banned file(1) types
# qr'^\.(exe|lha|tnef|cab|dll)$',         # banned file(1) types
);
# 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'] ],
  ['tar',  \&do_tar],
  ['deb',  \&do_ar,          'ar'],
# ['a',    \&do_ar,          'ar'],  # unpacking .a seems an overkill
  ['zip',  \&do_unzip],
  ['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.vanja.com/tools/sophie/
# ['Sophie',
#   \&ask_daemon, ["{}/\n", '/var/run/sophie'],
#   qr/(?x)^ 0+ ( : | [\000\r\n]* $)/,  qr/(?x)^ 1 ( : | [\000\r\n]* $)/,
#   qr/(?x)^ [-+]? \d+ : (.*?) [\000\r\n]* $/ ],

# ### http://www.csupomona.edu/~henson/www/projects/SAVI-Perl/
# ['Sophos SAVI', \&sophos_savi ],

# ### http://www.clamav.net/
['ClamAV-clamd',
  \&ask_daemon, ["CONTSCAN {}\n", "/var/spool/amavisd/clamd.sock"],
  qr/\bOK$/, qr/\bFOUND$/,
  qr/^.*?: (?!Infected Archive)(.*) FOUND$/ ],
# # NOTE: the easiest is to run clamd under the same user as amavisd; match the
# # socket name (LocalSocket) in clamav.conf to the socket name in this entry
# # When running chrooted one may prefer: ["CONTSCAN {}\n","$MYHOME/clamd"],

# ### http://www.clamav.net/ and CPAN  (memory-hungry! clamd is preferred)
# ['Mail::ClamAV', \&ask_clamav, "*", [0], [1], qr/^INFECTED: (.+)/],

# ### http://www.openantivirus.org/
# ['OpenAntiVirus ScannerDaemon (OAV)',
#   \&ask_daemon, ["SCAN {}\n", '127.0.0.1:8127'],
#   qr/^OK/, qr/^FOUND: /, qr/^FOUND: (.+)/ ],

# ### http://www.vanja.com/tools/trophie/
# ['Trophie',
#   \&ask_daemon, ["{}/\n", '/var/run/trophie'],
#   qr/(?x)^ 0+ ( : | [\000\r\n]* $)/,  qr/(?x)^ 1 ( : | [\000\r\n]* $)/,
#   qr/(?x)^ [-+]? \d+ : (.*?) [\000\r\n]* $/ ],

# ### http://www.grisoft.com/
# ['AVG Anti-Virus',
#   \&ask_daemon, ["SCAN {}\n", '127.0.0.1:55555'],
#   qr/^200/, qr/^403/, qr/^403 .*?: ([^\r\n]+)/ ],

# ### 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.sald.com/, http://www.dials.ru/english/, http://www.drweb.ru/
# ['DrWebD', \&ask_daemon,   # DrWebD 4.31 or later
#   [pack('N',1).  # DRWEBD_SCAN_CMD
#    pack('N',0x00280001).   # DONT_CHANGEMAIL, IS_MAIL, RETURN_VIRUSES
#    pack('N',     # path length
#      length("$TEMPBASE/amavis-yyyymmddTHHMMSS-xxxxx/parts/pxxx")).
#    '{}/*'.       # path
#    pack('N',0).  # content size
#    pack('N',0),
#    '/var/drweb/run/drwebd.sock',
#  # '/var/amavis/var/run/drwebd.sock',   # suitable for chroot
#  # '/usr/local/drweb/run/drwebd.sock',  # FreeBSD drweb ports default
#  # '127.0.0.1:3000',                    # or over an inet socket
#   ],
#   qr/\A\x00[\x10\x11][\x00\x10]\x00/s,         # IS_CLEAN,EVAL_KEY; SKIPPED
#   qr/\A\x00[\x00\x01][\x00\x10][\x20\x40\x80]/s, # KNOWN_V,UNKNOWN_V,V._MODIF
#   qr/\A.{12}(?:infected with )?([^\x00]+)\x00/s,
# ],
# # NOTE: If using amavis-milter, change length to:
# # length("$TEMPBASE/amavis-milter-xxxxxxxxxxxxxx/parts/pxxx").

  ### http://www.kaspersky.com/  (kav4mailservers)
  ['KasperskyLab AVP - aveclient',
    ['/usr/local/kav/bin/aveclient','/usr/local/share/kav/bin/aveclient',
     '/opt/kav/bin/aveclient','aveclient'],
    '-p /var/run/aveserver -s {}/*', [0,3,6,8], qr/\b(INFECTED|SUSPICION)\b/,
    qr/(?:INFECTED|SUSPICION) (.+)/,
  ],

  ### http://www.kaspersky.com/
  ['KasperskyLab AntiViral Toolkit Pro (AVP)', ['avp'],
    '-* -P -B -Y -O- {}', [0,3,6,8], [2,4],    # any use for -A -K   ?
    qr/infected: (.+)/,
    sub {chdir('/opt/AVP') or die "Can't chdir to AVP: $!"},
    sub {chdir($TEMPBASE) or die "Can't chdir back to $TEMPBASE $!"},
  ],

  ### The kavdaemon and AVPDaemonClient have been removed from Kasperky
  ### products and replaced by aveserver and aveclient
  ['KasperskyLab AVPDaemonClient',
    [ '/opt/AVP/kavdaemon',       'kavdaemon',
      '/opt/AVP/AvpDaemonClient', 'AvpDaemonClient',
      '/opt/AVP/AvpTeamDream',    'AvpTeamDream',
      '/opt/AVP/avpdc', 'avpdc' ],
    "-f=$TEMPBASE {}", [0,8], [3,4,5,6], qr/infected: ([^\r\n]+)/ ],
    # change the startup-script in /etc/init.d/kavd to:
    #   DPARMS="-* -Y -dl -f=/var/amavis /var/amavis"
    #   (or perhaps:   DPARMS="-I0 -Y -* /var/amavis" )
    # adjusting /var/amavis above to match your $TEMPBASE.
    # The '-f=/var/amavis' is needed if not running it as root, so it
    # can find, read, and write its pid file, etc., see 'man kavdaemon'.
    # defUnix.prf: there must be an entry "*/var/amavis" (or whatever
    #   directory $TEMPBASE specifies) in the 'Names=' section.
    # cd /opt/AVP/DaemonClients; configure; cd Sample; make
    # cp AvpDaemonClient /opt/AVP/
    # su - vscan -c "${PREFIX}/kavdaemon ${DPARMS}"

  ### http://www.centralcommand.com/
  ['CentralCommand Vexira (new) vascan',
    ['vascan','/usr/lib/Vexira/vascan'],
    "-a s --timeout=60 --temp=$TEMPBASE -y $QUARANTINEDIR ".
    "--vdb=/usr/lib/Vexira/vexira8.vdb --log=/var/log/vascan.log {}",
    [0,3], [1,2,5],
    qr/(?x)^\s* (?:virus|iworm|macro|mutant|sequence|trojan)\ found:\ ( [^\]\s']+ )\ \.\.\.\ / ],
    # Adjust the path of the binary and the virus database as needed.
    # 'vascan' does not allow to have the temp directory to be the same as
    # the quarantine directory, and the quarantine option can not be disabled.
    # If $QUARANTINEDIR is not used, then another directory must be specified
    # to appease 'vascan'. Move status 3 to the second list if password
    # protected files are to be considered infected.

  ### http://www.hbedv.com/
  ['H+BEDV AntiVir or the (old) CentralCommand Vexira Antivirus',
    ['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.commandsoftware.com/
  ['Command AntiVirus for Linux', 'csav',
    '-all -archive -packed {}', [50], [51,52,53],
    qr/Infection: (.+)/ ],

  ### http://www.symantec.com/
  ['Symantec CarrierScan via Symantec CommandLineScanner',
    'cscmdline', '-a scan -i 1 -v -s 127.0.0.1:7777 {}',
    qr/^Files Infected:\s+0$/, qr/^Infected\b/,
    qr/^(?:Info|Virus Name):\s+(.+)/ ],

  ### http://www.symantec.com/
  ['Symantec AntiVirus Scan Engine',
    'savsecls', '-server 127.0.0.1:7777 -mode scanrepair -details -verbose {}',
    [0], qr/^Infected\b/,
    qr/^(?:Info|Virus Name):\s+(.+)/ ],
    # NOTE: check options and patterns to see which entry better applies

  ### http://www.f-secure.com/products/anti-virus/
  ['F-Secure Antivirus', 'fsav',
    '--dumb --mime --archive {}', [0], [3,8],
    qr/(?:infection|Infected|Suspected): (.+)/ ],

# ### 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]+)/ ],

  ['CAI InoculateIT', 'inocucmd',  # retired product
    '-sec -nex {}', [0], [100],
    qr/was infected by virus (.+)/ ],
  # see: http://www.flatmtn.com/computer/Linux-Antivirus_CAI.html

  ### http://www3.ca.com/Solutions/Product.asp?ID=156  (ex InoculateIT)
  ['CAI eTrust Antivirus', 'etrust-wrapper',
    '-arc -nex -spm h {}', [0], [101],
    qr/is infected by virus: (.+)/ ],
    # NOTE: requires suid wrapper around inocmd32; consider flag: -mod reviewer
    # see http://marc.theaimsgroup.com/?l=amavis-user&m=109229779912783

  ### http://mks.com.pl/english.html
  ['MkS_Vir for Linux (beta)', ['mks32','mks'],
    '-s {}/*', [0], [1,2],
    qr/--[ \t]*(.+)/ ],

  ### http://mks.com.pl/english.html
  ['MkS_Vir daemon', 'mksscan',
    '-s -q {}', [0], [1..7],
    qr/^... (\S+)/ ],

  ### http://www.nod32.com/
  ['ESET Software NOD32 Command Line Interface v 2.51', 'nod32cli',
    '--subdir {}', [0,3], [1,2], qr/virus="([^"]+)"/ ],

# ### http://www.nod32.com/   old
# ['ESET Software NOD32 - Client/Server Version', 'nod32cli',
#   '-a -r -d recurse --heur standard {}', [0], [10,11],
#   qr/^\S+\s+infected:\s+(.+)/ ],

# ### http://www.nod32.com/   old
# ['ESET Software NOD32', 'nod32',
#   '--arch --mail {}', [0], [1,10], qr/^object=.*, virus="(.*?)",/ ],

# Experimental, based on posting from Rado Dibarbora (Dibo) on 2002-05-31
# ['ESET Software NOD32 Client/Server (NOD32SS)',
#   \&ask_daemon2,    # greets with 200, persistent, terminate with QUIT
#   ["SCAN {}/*\r\n", '127.0.0.1:8448' ],
#   qr/^200 File OK/, qr/^201 /, qr/^201 (.+)/ ],

  ### http://www.norman.com/products_nvc.shtml
  ['Norman Virus Control v5 / Linux', 'nvcc',
    '-c -l:0 -s -u -temp:$TEMPBASE {}', [0,10,11], [1,2,14],
    qr/(?i).* virus in .* -> \'(.+)\'/ ],

  ### http://www.pandasoftware.com/
  ['Panda Antivirus for Linux', ['pavcl'],
    '-aut -aex -heu -cmp -nbr -nor -nso -eng {}',
    qr/Number of files infected[ .]*: 0+(?!\d)/,
    qr/Number of files infected[ .]*: 0*[1-9]/,
    qr/Found virus :\s*(\S+)/ ],

# ### http://www.pandasoftware.com/
# ['Panda Antivirus for Linux', ['pavcl'],
#   '-TSR -aut -aex -heu -cmp -nbr -nor -nso -eng {}',
#   [0], [0x10, 0x30, 0x50, 0x70, 0x90, 0xB0, 0xD0, 0xF0],
#   qr/Found virus :\s*(\S+)/ ],

# GeCAD AV technology is acquired by Microsoft; RAV has been discontinued.
# Check your RAV license terms before fiddling with the following two lines!
# ['GeCAD RAV AntiVirus 8', 'ravav',
#   '--all --archive --mail {}', [1], [2,3,4,5], qr/Infected: (.+)/ ],
# # NOTE: the command line switches changed with scan engine 8.5 !
# # (btw, assigning stdin to /dev/null causes RAV to fail)

  ### http://www.nai.com/
  ['NAI McAfee AntiVirus (uvscan)', 'uvscan',
    '--secure -rv --mime --summary --noboot - {}', [0], [13],
    qr/(?x) Found (?:
        \ the\ (.+)\ (?:virus|trojan)  |
        \ (?:virus|trojan)\ or\ variant\ (.+?)\s*! |
        :\ (.+)\ NOT\ a\ virus)/,
  # sub {$ENV{LD_PRELOAD}='/lib/libc.so.6'},
  # sub {delete $ENV{LD_PRELOAD}},
  ],
  # NOTE1: with RH9: force the dynamic linker to look at /lib/libc.so.6 before
  # anything else by setting environment variable LD_PRELOAD=/lib/libc.so.6
  # and then clear it when finished to avoid confusing anything else.
  # NOTE2: to treat encrypted files as viruses replace the [13] with:
  #  qr/^\s{5,}(Found|is password-protected|.*(virus|trojan))/

  ### http://www.virusbuster.hu/en/
  ['VirusBuster', ['vbuster', 'vbengcl'],
    "{} -ss -i '*' -log=$MYHOME/vbuster.log", [0], [1],
    qr/: '(.*)' - Virus/ ],
  # VirusBuster Ltd. does not support the daemon version for the workstation
  # engine (vbuster-eng-1.12-linux-i386-libc6.tgz) any longer. The names of
  # binaries, some parameters AND return codes have changed (from 3 to 1).
  # See also the new Vexira entry 'vascan' which is possibly related.

# ### http://www.virusbuster.hu/en/
# ['VirusBuster (Client + Daemon)', 'vbengd',
#   '-f -log scandir {}', [0], [3],
#   qr/Virus found = (.*);/ ],
# # HINT: for an infected file it always returns 3,
# # although the man-page tells a different story

  ### http://www.cyber.com/
  ['CyberSoft VFind', 'vfind',
    '--vexit {}/*', [0], [23], qr/##==>>>> VIRUS ID: CVDL (.+)/,
  # sub {$ENV{VSTK_HOME}='/usr/lib/vstk'},
  ],

  ### 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.ikarus-software.com/
  ['Ikarus AntiVirus for Linux', 'ikarus',
    '{}', [0], [40], qr/Signature (.+) found/ ],

  ### 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'

# ['File::Scan', sub {Amavis::AV::ask_av(sub{
#   use File::Scan; my($fn)=@_;
#   my($f)=File::Scan->new(max_txt_size=>0, max_bin_size=>0);
#   my($vname) = $f->scan($fn);
#   $f->error ? (2,"Error: ".$f->error)
#   : ($vname ne '') ? (1,"$vname FOUND") : (0,"Clean")}, @_) },
#   ["{}/*"], [0], [1], qr/^(.*) FOUND$/ ],

# ### example: fully-fledged checker for JPEG marker segments of invalid length
# ['check-jpeg',
#   sub { use JpegTester (); Amavis::AV::ask_av(\&JpegTester::test_jpeg, @_) },
#   ["{}/*"], undef, [1], qr/^(bad jpeg: .*)$/ ],
# # NOTE: place file JpegTester.pm somewhere where Perl can find it,
# #       for example in /usr/local/lib/perl5/site_perl

);


@av_scanners_backup = (

  ### http://www.clamav.net/   - backs up clamd or Mail::ClamAV
  ['ClamAV-clamscan', 'clamscan',
    "--stdout --disable-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],
    qr/Infection: (.+)|\s+contains\s+(.+)$/ ],

  ### http://www.trendmicro.com/   - backs up Trophie
  ['Trend Micro FileScanner', ['/etc/iscan/vscan','vscan'],
    '-za -a {}', [0], qr/Found virus/, qr/Found virus (.+) in/ ],

  ### http://www.sald.com/, http://drweb.imshop.de/   - backs up DrWebD
  ['drweb - DrWeb Antivirus',
    ['/usr/local/drweb/drweb', '/opt/drweb/drweb', 'drweb'],
    '-path={} -al -go -ot -cn -upn -ok-',
    [0,32], [1,9,33], qr' infected (?:with|by)(?: virus)? (.*)$'],

  ['KasperskyLab kavscanner', ['/opt/kav/bin/kavscanner','kavscanner'],
    '-i1 -xp {}', [0,10,15], [5,20,21,25],
    qr/(?:CURED|INFECTED|CUREFAILED|WARNING|SUSPICION) (.*)/ ,
    sub {chdir('/opt/kav/bin') or die "Can't chdir to kav: $!"},
    sub {chdir($TEMPBASE) or die "Can't chdir back to $TEMPBASE $!"},
  ],

# Commented out because the name 'sweep' clashes with Debian and FreeBSD
# package/port of an audio editor. Make sure the correct 'sweep' is found
# in the path when enabling.
#
# ### http://www.sophos.com/   - backs up Sophie or SAVI-Perl
# ['Sophos Anti Virus (sweep)', 'sweep',
#   '-nb -f -all -rec -ss -sc -archive -cab -tnef --no-reset-atime {}',
#   [0,2], qr/Virus .*? found/,
#   qr/^>>> Virus(?: fragment)? '?(.*?)'? found/,
# ],
# # other options to consider: -mime -oe -idedir=/usr/local/sav

# always succeeds (uncomment to consider mail clean if all other scanners fail)
# ['always-clean', sub {0}],

);


1;  # insure a defined return

amavisd-new is the program that glues together Postfix and SpamAssassin/ClamAV. Postfix passes the mails to amavisd-new which then invokes SpamAssassin and ClamAV to scan the emails. Please have a look at the Spamassassin and ClamAV settings in /etc/amavisd/amavisd.conf. Of course, you can customize that file a lot more. Feel free to do so, and have a look at the explanations in the original /etc/amavisd/amavisd.conf file!

When we installed ClamAV, a cron job got installed that tries to update the ClamAV virus database every three hours. But this works only if we enable it in /etc/sysconfig/freshclam and /etc/freshclam.conf:

vi /etc/sysconfig/freshclam

Comment out the FRESHCLAM_DELAY line at the end:

## When changing the periodicity of freshclam runs in the crontab,
## this value must be adjusted also. Its value is the timespan between
## two subsequent freshclam runs in minutes. E.g. for the default
##
## | 0 */3 * * *  ...
##
## crontab line, the value is 180 (minutes).
# FRESHCLAM_MOD=

## A predefined value for the delay in seconds. By default, the value is
## calculated by the 'hostid' program. This predefined value guarantees
## constant timespans of 3 hours between two subsequent freshclam runs.
##
## This option accepts two special values:
## 'disabled-warn'  ...  disables the automatic freshclam update and
##                         gives out a warning
## 'disabled'       ...  disables the automatic freshclam silently
# FRESHCLAM_DELAY=


### !!!!! REMOVE ME !!!!!!
### REMOVE ME: By default, the freshclam update is disabled to avoid
### REMOVE ME: network access without prior activation
#FRESHCLAM_DELAY=disabled-warn  # REMOVE ME

vi /etc/freshclam.conf

Comment out the Example line:

[...]
# Comment or remove the line below.
#Example
[...]

Now let's create the system startup links for ClamAV and amavisd-new, update ClamAV's virus signature database, and start both services:

chkconfig --levels 235 amavisd on
chkconfig --levels 235 clamd.amavisd on
/usr/bin/freshclam
/etc/init.d/amavisd start
/etc/init.d/clamd.amavisd start

Now we have to configure Postfix to pipe incoming email through amavisd-new:

postconf -e 'content_filter = amavis:[127.0.0.1]:10024'
postconf -e 'receive_override_options = no_address_mappings'

Afterwards append the following lines to /etc/postfix/master.cf:

vi /etc/postfix/master.cf

[...]
amavis unix - - - - 2 smtp
        -o smtp_data_done_timeout=1200
        -o smtp_send_xforward_command=yes

127.0.0.1:10025 inet n - - - - smtpd
        -o content_filter=
        -o local_recipient_maps=
        -o relay_recipient_maps=
        -o smtpd_restriction_classes=
        -o smtpd_client_restrictions=
        -o smtpd_helo_restrictions=
        -o smtpd_sender_restrictions=
        -o smtpd_recipient_restrictions=permit_mynetworks,reject
        -o mynetworks=127.0.0.0/8
        -o strict_rfc821_envelopes=yes
        -o receive_override_options=no_unknown_recipient_checks,no_header_body_checks
        -o smtpd_bind_address=127.0.0.1

and restart Postfix:

/etc/init.d/postfix restart


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