Friday, May 15, 2009

[Freebsd] amavsid.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 = (1);  # controls running of anti-virus code
# @bypass_spam_checks_maps  = (1);  # 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  = 'vscan';     # (no default;  customary: vscan or amavis), -u
$daemon_group = 'vscan';     # (no default;  customary: vscan or amavis), -g
$mydomain = 'kcching.myftp.org';   # 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 = 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
$nanny_details_level = 2;    # nanny verbosity: 1: traditional, 2: detailed
@local_domains_maps = ( [".$mydomain"] );  # list of all local domains
@mynetworks = qw( 127.0.0.0/8 [::1] [FE80::]/10 [FEC0::]/10
10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 );
$unix_socketname = "$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  => ["virusalert\@$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  = 2.0;  # add spam info headers if at, or above that level
$sa_tag2_level_deflt = 6.2;  # add 'spam detected' headers at that level
$sa_kill_level_deflt = 6.9;  # triggers spam evasive actions (e.g. blocks mail)
$sa_dsn_cutoff_level = 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
$sa_local_tests_only = 0;    # only tests which do not require internet access?
# @lookup_sql_dsn =
#   ( ['DBI:mysql:database=mail;host=127.0.0.1;port=3306', 'user1', 'passwd1'],
#     ['DBI:mysql:database=mail;host=host2', 'username2', 'password2'],
#     ["DBI:SQLite:dbname=$MYHOME/sql/mail_prefs.sqlite", '', ''] );
# @storage_sql_dsn = @lookup_sql_dsn;  # none, same, or separate database
# $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)
$virus_admin               = "virusalert\@$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 = '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_BOUNCE;
$final_banned_destiny     = D_BOUNCE;
$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
$banned_filename_re = new_RE(
### BLOCKED ANYWHERE
# qr'^UNDECIPHERABLE$',  # 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://clamav.elektrapro.com/
['Clam Antivirus-clamd',
  \&ask_daemon, ["CONTSCAN {}\n", '/var/run/clamav/clamd'],
  qr/\bOK$/, qr/\bFOUND$/,
  qr/^.*?: (?!Infected Archive)(.*) FOUND$/ ],
);
@av_scanners_backup = (
);
1;  # insure a defined return

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