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Postfix-不明な受信者の電子メールによってSPAM学習メールボックスに転送が拒否されました

いくつかのExchangeの前に、Postfix + BitDefenderFRAMSを衛生ゲートウェイとして実行しています。 BD FRAMSは、専用のメールボックスからSPAMおよびHAMの電子メールをダウンロードすることにより、そのBaesianフィルターを学習できます。未知の受信者へのSPAMの継続的な流れがあるため、この有用なSPAM電子メールのソースをSPAM学習メールボックスに直接リダイレクトすることを考えています。

私の設定:

main.cf:

myhostname = posfix.example.com
smtpd_banner = $myhostname
#myorigin = example.com
mydestination =
local_recipient_maps =
#virtual_alias_maps = hash:/etc/postfix/virtual
local_transport = error:local mail delivery is disabled

mynetworks = /etc/postfix/mynetworks

smtpd_use_tls = yes
#smtpd_tls_auth_only = yes
smtpd_tls_key_file = /etc/ssl/certs/posfix.example.com.pem
smtpd_tls_cert_file = /etc/ssl/certs/posfix.example.com.pem
smtpd_tls_CApath = /etc/ssl/certs
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_tls_session_cache_timeout = 3600s

relay_domains = mysql:/etc/postfix/relay_domains
transport_maps = mysql:/etc/postfix/transport
relay_recipient_maps = mysql:/etc/postfix/relay_recipient_maps

show_user_unknown_table_name = no
unknown_local_recipient_reject_code = 550

mailbox_size_limit = 102400000000
message_size_limit = 102400000

smtpd_delay_reject = yes
smtpd_helo_required = yes

#smtpd_helo_restrictions =
#  permit_mynetworks
#  reject_invalid_hostname
#  permit

smtpd_restriction_classes = verify_sender
verify_sender =
  reject_unverified_sender

smtpd_sender_restrictions =
  permit_mynetworks

smtpd_recipient_restrictions =
  reject_unknown_recipient_domain
  reject_non_fqdn_recipient
  permit_mynetworks
  reject_authenticated_sender_login_mismatch
  reject_unauth_destination
  check_recipient_access hash:/etc/postfix/recipient_access
  check_sender_access hash:/etc/postfix/sender_access
  #check_helo_access pcre:/etc/postfix/helo_access
  reject_non_fqdn_sender
  reject_unknown_sender_domain
  reject_unlisted_sender
  reject_invalid_hostname
  reject_unauth_pipelining
  check_sender_mx_access cidr:/etc/postfix/sender_mx_access
  #reject_non_fqdn_hostname
  #reject_unverified_sender
  #reject_multi_recipient_bounce
  permit

#smtpd_data_restrictions =
  #reject_multi_recipient_bounce

# Added by BitDefender on Mon Nov  3 15:27:43 EET 2014
smtpd_milters=unix:/var/spool/postfix/BitDefender/bdmilterd.sock
milter_protocol = 2
milter_default_action = tempfail
milter_connect_timeout = 30s
milter_command_timeout = 30s
milter_content_timeout = 30s
# End of added lines

/ etc/postfix/repository_domains:

user = postfix
password = postfix
dbname = postfix
query = SELECT name FROM relay_domains WHERE name='%s'

/ etc/postfix/transport:

user = postfix
password = postfix
dbname = postfix
query = SELECT nexthop FROM relay_domains WHERE name='%s'

/ etc/postfix/repository_recipient_maps:

user = postfix
password = postfix
dbname = postfix
query = SELECT email FROM relay_users WHERE email='%s'

cron用のAD(親切に共有)のfillrelay-usersのスクリプト:

#!/usr/bin/python

__author__ = 'tiv'

import ldap
import MySQLdb

connections = {
    1: ['dc.example.com',  # AD domain controller
        'EXAMPLE\\user',  # AD user
        'password',  # AD user password
        'dc=example, dc=local',  # AD root DN
        'mail.example.com'],  # Exchange server

    2: ['dc.example1.com',  # AD domain controller
        'EXAMPLE1\\user',  # AD user
        'password',  # AD user password
        'dc=example1, dc=local',  # AD root DN
        'mail.example1.com'],  # Exchange server

    #3: 'dc.example2.com',  # AD domain controller
    #   'EXAMPLE2\\user',  # AD user
    #   'password',  # AD user password
    #   'dc=example2, dc=local',  # AD root DN
    #   'mail.example2.com'],  # Exchange server
}

mysql = ['localhost',  # Host
         'postfix',  # user
         'postfix',  # password
         'postfix']  # schema

def main():
    try:
        emails = []
        domains = []
        for i in connections:
            connection = connections[i]
            print('Processing LDAP server ' + connection[0] + ':')
            basedn = connections[i][3]
            nexthop = connections[i][4]
            lc = ldapconnection(connection)
            ls = ldapsearch(lc, basedn)
            rl = resultlist(ls)
            emails.extend(rl[0])
            for domain in rl[1]:
                domains.append([domain, nexthop])
            print('Processing of LDAP server ' + connection[0] + ' completed.')
        createdb(emails, domains, mysql)
        print('Operation completed successfully!')
    except:
        print('Error processing of LDAP server ' + connection[0] + '!')
        pass

def ldapconnection(ldapserver):
    try:
        print(' Trying to connect to LDAP server ' + ldapserver[0] + '...')
        ldapconnection = ldap.initialize('ldap://' + ldapserver[0])
        ldapconnection.simple_bind_s(ldapserver[1], ldapserver[2])
        ldapconnection.protocol_version = ldap.VERSION3
        ldapconnection.set_option(ldap.OPT_REFERRALS, 0)
        print(' Connection to LDAP server ' + ldapserver[0] + ' succesfull.')
    except:
        print('Error connecting to LDAP server ' + ldapserver[0] + '!')
        pass
    return ldapconnection

def ldapsearch(ldapconnection, basedn):
    try:
        print(' Sending LDAP query request...')
        scope = ldap.SCOPE_SUBTREE
        filter = '(&(proxyAddresses=smtp:*)(!(objectClass=contact)))'
        attributes = ['proxyAddresses']
        searchresults = ldapconnection.search_s(basedn, scope, filter, attributes)
        print(' LDAP query request results received.')
    except:
        print('Error sending LDAP query request!')
        pass
    return searchresults

def resultlist(searchresults):
    try:
        print(' Processing LDAP query results...')
        emails = []
        domains = []
        for i in range(len(searchresults)):
            try:
                for j in range(len(searchresults[i][1]['proxyAddresses'])):
                    r = searchresults[i][1]['proxyAddresses'][j].lower()
                    if 'smtp:' in r:
                        email = r[5:]
                        emails.append(email)
                        domain = email.split("@")[1]
                        domains.append(domain)
            except:
                pass
        print(' LDAP query results processed.')
    except:
        print('Error processing LDAP query results!')
        pass
    return removedublicates(emails), removedublicates(domains)


def createdb(emails, domains, mysql):
    try:
        print('Connecting to DB ' + mysql[3] + '...')
        try:
            db = MySQLdb.connect(Host=mysql[0], user=mysql[1], passwd=mysql[2])
            cursor = db.cursor()
            sql = 'CREATE SCHEMA IF NOT EXISTS ' + mysql[3]
            cursor.execute(sql)
            db.commit()
        except:
            pass
        try:
            db = MySQLdb.connect(Host=mysql[0], user=mysql[1], passwd=mysql[2], db=mysql[3])
            cursor = db.cursor()
        except:
            print('Error connecting to DB ' + mysql[3] + '!')
        print(' Check schemas and tables...')
        sql = ['CREATE TABLE IF NOT EXISTS ' + mysql[3] + '.relay_users (id INT NOT NULL, email LONGTEXT NULL, PRIMARY KEY (id))',
               'CREATE TABLE IF NOT EXISTS ' + mysql[3] + '.relay_domains (id INT NOT NULL, name LONGTEXT NULL, nexthop LONGTEXT NULL, PRIMARY KEY (id))',
               'TRUNCATE ' + mysql[3] + '.relay_users',
               'TRUNCATE ' + mysql[3] + '.relay_domains']
        for i in range(len(sql)):
            cursor.execute(sql[i])
            db.commit()
        print(' Inserting domains...')
        for i in range(len(domains)):
            sql = 'INSERT INTO postfix.relay_domains (id, name, nexthop)' \
                  'VALUES ("' + str(i) + '", "' + domains[i][0] + '", "smtp:[' + domains[i][1] + ']")'
            cursor.execute(sql)
            db.commit()
        print(' Inserting emails...')
        for i in range(len(emails)):
            sql = 'INSERT INTO postfix.relay_users (id, email)' \
                  'VALUES ("' + str(i) + '", "' + emails[i] + '")'
            cursor.execute(sql)
            db.commit()
        db.close()
        print('Connection to DB ' + mysql[3] + ' closed.')
    except:
        print('Error while operating with DB ' + mysql[3] + '!')
        pass

def removedublicates(input):
    seen = set()
    seen_add = seen.add
    return [x for x in input if not (x in seen or seen_add(x))]

if __name__ == '__main__':
    main()

誰かがこれを行う方法を知っているなら、私は感謝します。ありがとう。

3
tiv

この問題のため、あなたの要求は少し複雑です。 Postfixは、設計上、マップからの肯定的な結果に基づいて何かを実行します。たとえば、transport_mapsでは、受信者がマップルックアップの結果が良好な場合、特定のホストに電子メールを送信します。ただし、relay_recipient_mapsルックアップから否定的な結果が出た場合は、何かを実行したい(別のメールボックスにリダイレクトしたい)。マップの種類はハッシュ他に方法はないと思いますマップに負の結果ロジックを実装するためのsql/tcpマップを含まない限り。

SQLソリューションの場合、ここにアイデアがあります:

この例では、sqliteを使用します。 Relay_recipientという名前の1つの列を持つテーブルがあるとします。今クエリ

select ifnull(select relay_recipient from mytable WHERE relay_recipient = %s, '[email protected]')

受信者がrelay_recipient_mapsに存在しない場合は常に、[email protected]を返します。それらのマップをvirtual_aliasパラメーターに配置します。その後、不明なユーザーに電子メールが送信されるたびに、mailboxspam @ example.comにエイリアスされます。

3
tpml7

@ tmpl7の+1は、sqliteを使用してシナリオを実装する方法について素晴らしいアイデアを持っています

ここでの問題は、virtual_alias_mapsパラメーターにifnullのSQLクエリを実装していないことです。まず、virtual_alias_mapsmain.cfを定義します

virtual_alias_maps = mysql:/etc/postfix/redirect2spamlearning

/etc/postfix/redirect2spamlearningの内容

user = postfix
password = postfix
dbname = postfix
query = SELECT IFNULL((SELECT email FROM relay_users WHERE email='%s'), '[email protected]')

ロジックは次のとおりです。SELECT email FROM relay_users WHERE email='%s'がnull値とも呼ばれるものを返さない場合、電子メールは[email protected]にリダイレクトされます。

2
masegaloeh