Содержание

Postfix в качестве почтового шлюза организации

Черновик!

Список задач

Используемое ПО

Установка

Postfix & Active Directory integration
# apt-get install postfix

Postfix & Active Directory integration
# apt-get install postfix-ldap

Amavis
# apt-get install amavis amavisd-new

ClamAV
# apt-get install clamav clamav-daemon clamav-dreshclam

Архиваторы для распаковки вложений
# apt-get install zoo unzip bzip2 p7zip cpio cabextract tnef pax nomarch lzop altermime arj lhasa ripole unrar

…

Интеграция с Microsoft Active Directory

Создаем файл ldap_mydomain.ru.cf с примерно таким содержимым: 

# Проверка существования почтовых ящиков в Active Directory

server_host = ldap://mydomain.int
server_port = 3268
timeout = 60
search_base = DC=mydomain,DC=int
query_filter = (&(proxyAddresses=smtp:%s)(!(userAccountControl:1.2.840.113556.1.4.803:=2))(|(objectClass=user)(objectClass=group)(objectClass=contact)(objectClass=publicFolder)))
result_format = %s
result_attribute = cn
#result_attribute = sAMAccountName
special_result_attribute =
scope = sub
bind = yes
bind_dn = [email protected]
bind_pw = LDAPSecretPassword
dereference = 0
domain = mydomain.ru
version=3
debuglevel = 0
#debuglevel = 9

Проверяем как оно работает: 

# postmap -q [email protected] ldap://etc/postfix/ldap_mydomain.ru.cf

Если все хорошо и правильно - должны показаться ФИО учетной записи [email protected]

Добавляем проверку в postfix/main.cf: 

virtual_mailbox_maps = ldap:/etc/postfix/ldap_mydomain.ru.cf

Amavis

Настраиваем по очереди в /etc/amavis/conf.d/ (показаны только основные изменения)

01-debian 

use strict;

$ENV{PATH} = $path = '/usr/local/sbin:/usr/local/bin:/usr/sbin:/sbin:/usr/bin:/bin';
$file   = 'file';
$gzip   = 'gzip';
$bzip2  = 'bzip2';
$lzop   = 'lzop';
$rpm2cpio   = ['rpm2cpio.pl','rpm2cpio'];
$cabextract = 'cabextract';
$uncompress = ['uncompress', 'gzip -d', 'zcat'];
$unfreeze   = ['unfreeze', 'freeze -d', 'melt', 'fcat'];
$arc        = ['nomarch', 'arc'];
$unarj      = ['arj', 'unarj'];
$unrar      = ['rar', 'unrar']; #disabled (non-free, no security support)
$zoo    = 'zoo';
$lha    = 'lha';
$lha    = undef;
$pax    = 'pax';
$cpio   = 'cpio';
$ar     = 'ar';
$ripole = 'ripole';
$dspam  = 'dspam';

1;  # ensure a defined return

15-av_scanners 

### http://www.clamav.net/
 ['ClamAV-clamd',
   \&ask_daemon, ["CONTSCAN {}\n", "/var/run/clamav/clamd.ctl"],
   qr/\bOK$/m, qr/\bFOUND$/m,
   qr/^.*?: (?!Infected Archive)(.*) FOUND$/m ],

15-content_filter_mode 

use strict;

# You can modify this file to re-enable SPAM checking through spamassassin
# and to re-enable antivirus checking.

#
# Default antivirus checking mode
# Please note, that anti-virus checking is DISABLED by
# default.
# If You wish to enable it, please uncomment the following lines:

@bypass_virus_checks_maps = (
   \%bypass_virus_checks, \@bypass_virus_checks_acl, \$bypass_virus_checks_re);

#
# Default SPAM checking mode
# Please note, that anti-spam checking is DISABLED by
# default.
# If You wish to enable it, please uncomment the following lines:

@bypass_spam_checks_maps = (
   \%bypass_spam_checks, \@bypass_spam_checks_acl, \$bypass_spam_checks_re);

1;  # ensure a defined return

20-debian_defaults 

use strict;
$QUARANTINEDIR = "$MYHOME/virusmails";
$quarantine_subdir_levels = 1; # enable quarantine dir hashing
$log_recip_templ = undef;    # disable by-recipient level-0 log entries
$DO_SYSLOG = 1;              # log via syslogd (preferred)
$syslog_ident = 'amavis';    # syslog ident tag, prepended to all messages
$syslog_facility = 'mail';
$syslog_priority = 'debug';  # switch to info to drop debug output, etc
$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;   # default listening socket
$sa_spam_subject_tag = '***SPAM*** ';
$sa_tag_level_deflt  = -999;  # add spam info headers if at, or above that level
$sa_tag2_level_deflt = 6.0; # add 'spam detected' headers at that level
$sa_kill_level_deflt = 21.0; # triggers spam evasive actions
$sa_dsn_cutoff_level = 7;   # spam level beyond which a DSN is not sent
$sa_mail_body_size_limit = 200*1024; # don't waste time on SA if mail is larger
$sa_local_tests_only = 0;    # only tests which do not require internet access?
$MAXLEVELS = 14;
$MAXFILES = 1500;
$MIN_EXPANSION_QUOTA =      100*1024;  # bytes
$MAX_EXPANSION_QUOTA = 300*1024*1024;  # bytes
$final_virus_destiny      = D_DISCARD;  # (data not lost, see virus quarantine)
$final_banned_destiny     = D_BOUNCE;   # D_REJECT when front-end MTA
$final_spam_destiny       = D_DISCARD;
$final_bad_header_destiny = D_PASS;     # False-positive prone (for spam)
$enable_dkim_verification = 1;
$virus_admin = "postmaster\@$mydomain"; # due to D_DISCARD default
$X_HEADER_LINE = "$myproduct_name at $mydomain";
@viruses_that_fake_sender_maps = (new_RE(
  [qr'\bEICAR\b'i => 0],            # av test pattern name
  [qr/.*/ => 1],  # true for everything else
));
@keep_decoded_original_maps = (new_RE(
  qr'^MAIL-UNDECIPHERABLE$', # recheck full mail if it contains undecipherables
  qr'^(ASCII(?! cpio)|text|uuencoded|xxencoded|binhex)'i,
));
$banned_filename_re = new_RE(
  # block certain double extensions anywhere in the base name
  qr'\.[^./]*\.(exe|vbs|pif|scr|bat|cmd|com|cpl|dll)\.?$'i,
  qr'\{[0-9a-f]{8}(-[0-9a-f]{4}){3}-[0-9a-f]{12}\}?$'i, # Windows Class ID CLSID, strict
  qr'^application/x-msdownload$'i,                  # block these MIME types
  qr'^application/x-msdos-program$'i,
  qr'^application/hta$'i,
  qr'.\.(exe|vbs|pif|scr|bat|cmd|com|cpl)$'i, # banned extension - basic
  qr'^\.(exe-ms)$',                       # banned file(1) types
);
@score_sender_maps = ({ # a by-recipient hash lookup table,
                        # results from all matching recipient tables are summed
  ## 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],
   ),
   { # a hash-type lookup table (associative array)
     #'[email protected]'                        => -3.0,
     #'[email protected]'              => -3.0,
     #'[email protected]'                    => -3.0,
     #'[email protected]'                  => -3.0,
     #'securityfocus.com'                      => -3.0,
     #'[email protected]'       => -3.0,
     #'[email protected]'      => -3.0,
     #'[email protected]'      => -3.0,
     #'[email protected]'=> -3.0,
     #'[email protected]' => -3.0,
     #'spamassassin.apache.org'                => -3.0,
     #'[email protected]'   => -3.0,
     #'[email protected]'        => -3.0,
     #'[email protected]'     => -3.0,
     #'[email protected]'   => -3.0,
     #'[email protected]' => -3.0,
     #'[email protected]'                => -3.0,
     #'[email protected]'               => -3.0,
     #'[email protected]'                  => -3.0,
     #'[email protected]'          => -3.0,
     #'[email protected]'           => -3.0,
     #'[email protected]'       => -3.0,
     #'[email protected]'          => -3.0,
     #'[email protected]'            => -3.0,
     #'[email protected]'            => -3.0,
     #'[email protected]'                => -5.0,
     #'[email protected]'           => -3.0,
     #'returns.groups.yahoo.com'               => -3.0,
     #'[email protected]'           => -3.0,
     #lc('[email protected]')    => -3.0,
     #lc('[email protected]') => -5.0,
     # soft-blacklisting (positive score)
     #'[email protected]'                     =>  3.0,
     #'.example.net'                           =>  1.0,
   },
  ],  # end of site-wide tables
});
1;  # ensure a defined return

21-ubuntu_defaults 

use strict;

#
# These are Ubuntu specific defaults for amavisd-new configuration
#
# DOMAIN KEYS IDENTIFIED MAIL (DKIM)
$enable_dkim_verification = 1;
# Don't be verbose about sending mail:
@whitelist_sender_acl = qw( .$mydomain );
$final_virus_destiny      = D_DISCARD; # (defaults to D_BOUNCE)
$final_banned_destiny     = D_DISCARD;  # (defaults to D_BOUNCE)
$final_spam_destiny       = D_DISCARD;  # (defaults to D_REJECT)
$final_bad_header_destiny = D_PASS;  # (defaults to D_PASS), D_BOUNCE suggested
#$bad_header_quarantine_to = undef # use this for not quarantine mails with bad_header

$virus_admin = undef;
$spam_admin = undef;

#------------ Do not modify anything below this line -------------
1;  # insure a defined return

Ну и все остальное по желанию

Dualdelivery - двойная доставка

Для некоторых целей требуется чтобы входящая почта пересылалась на несколько серверов: основной и резервный.

Для этого был найдена интересная статейка: http://pjrlost.blogspot.ru/2012/11/smtp-delivery-to-two-mail-servers-via.html

Осталось только немного заменить настройку чтобы почта шла таким путем: Internet → Postfix → Amavis(Antivirus → AntiSpam) → Postfix → Dualdelivery → Мои почтовые сервера