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 = 'amavis'; # (no default; customary: vscan or amavis), -u $daemon_group = 'amavis'; # (no default; customary: vscan or amavis), -g $mydomain = 'ipfire.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 = 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 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 ); $unix_socketname = "$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 => ["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 = 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? $virus_admin = "virusalert\@$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 = 'ipfire.localdomain'; # 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_DISCARD; $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. $warnbannedsender = 1; # Notify sender of syntactically invalid header containing non-ASCII characters? Bloß nicht! #$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/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)]*>clean<\/summary>/, # qr/(?i)]*>infected<\/summary>/, # qr/(?i)(.+)<\/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