Clamav Milter Setup

• Edit /etc/sysconfig/clamav-milter:

CLAMAV_FLAGS="
        --config-file=/etc/clamd.conf
        --force-scan
        --local
        --max-children=5
        --sendmail-cf=
        --outgoing
        --quiet
"
SOCKET_ADDRESS="local:/var/clamav/clmilter.socket"

• Patch the init file to fix socket permissions:

wget http://www.topdog-software.com/files/clamav-milter.patch
patch /etc/init.d/clamav-milter < clamav-milter.patch

MySQL Setup

Basic Config

• Listen only to the localhost, edit /etc/my.cnf under the mysqld section:

bind-address = 127.0.0.1

Set Root Password

• Set the root password:

service mysqld start
mysqladmin -u root password NEWPASSWORD

SpamAssassin Setup

Basic Config

required_hits 5
report_safe 0
rewrite_header Subject [SPAM]

Create MySQL Database

• Create the database:

mysqladmin -p create bayes

• Populate the database:

mysql -p bayes < /usr/share/doc/spamassassin-$(rpm --qf %{VERSION} -q spamassassin)/sql/bayes_mysql.sql

• Create the user:

mysql -p
mysql> GRANT ALL ON bayes.* TO bayes@localhost IDENTIFIED BY 'password';

Configure To Use DB

• Edit the file /etc/mail/spamassassin/local.cf and add:

bayes_store_module  Mail::SpamAssassin::BayesStore::MySQL
bayes_sql_dsn       DBI:mysql:bayes:localhost
bayes_sql_override_username bayes
bayes_sql_username  bayes
bayes_sql_password  password

Configure FuzzyOCR

We will be storing the image hashes in a mysql database to improve on performance such that images that we have already scanned do not get scanned again as OCR is a resource intense activity.

Create MySQL Database

• The sql script creates the database and tables and adds a user fuzzyocr with the password fuzzyocr:

mysql -p < /usr/local/src/devel/FuzzyOcr.mysql

• Change the password:

mysqladmin -u fuzzyocr -p fuzzyocr password

Basic Settings

• Edit /etc/mail/spamassassin/FuzzyOCR.cf and set the basic options:

focr_path_bin /usr/bin:/usr/local/bin
focr_minimal_scanset 1
focr_autosort_scanset 1
focr_enable_image_hashing 3
focr_logfile /tmp/FuzzyOcr.log

Make FuzzyOCR Use The Database

• Edit the file /etc/mail/spamassassin/FuzzyOcr.cf and add:

focr_mysql_db FuzzyOcr
focr_mysql_hash Hash
focr_mysql_safe Safe
focr_mysql_user fuzzyocr
focr_mysql_pass password
focr_mysql_host localhost
focr_mysql_port 3306
focr_mysql_socket /var/lib/mysql/mysql.sock

SARE Rule Updates

• Import the GPG key used to sign the rules:

mkdir /etc/mail/spamassassin/sa-update-keys/
chmod 700 /etc/mail/spamassassin/sa-update-keys/
wget http://daryl.dostech.ca/sa-update/sare/GPG.KEY
sa-update --import GPG.KEY

• Create the channels file /etc/mail/spamassassin/sare-sa-update-channels.txt:

updates.spamassassin.org
72_sare_redirect_post3.0.0.cf.sare.sa-update.dostech.net
70_sare_evilnum0.cf.sare.sa-update.dostech.net
70_sare_bayes_poison_nxm.cf.sare.sa-update.dostech.net
70_sare_html0.cf.sare.sa-update.dostech.net
70_sare_html_eng.cf.sare.sa-update.dostech.net
70_sare_header0.cf.sare.sa-update.dostech.net
70_sare_header_eng.cf.sare.sa-update.dostech.net
70_sare_specific.cf.sare.sa-update.dostech.net
70_sare_adult.cf.sare.sa-update.dostech.net
72_sare_bml_post25x.cf.sare.sa-update.dostech.net
99_sare_fraud_post25x.cf.sare.sa-update.dostech.net
70_sare_spoof.cf.sare.sa-update.dostech.net
70_sare_random.cf.sare.sa-update.dostech.net
70_sare_oem.cf.sare.sa-update.dostech.net
70_sare_genlsubj0.cf.sare.sa-update.dostech.net
70_sare_genlsubj_eng.cf.sare.sa-update.dostech.net
70_sare_unsub.cf.sare.sa-update.dostech.net
70_sare_uri0.cf.sare.sa-update.dostech.net
70_sare_obfu0.cf.sare.sa-update.dostech.net
70_sare_stocks.cf.sare.sa-update.dostech.net

• Create an update script /usr/local/bin/update-sa:

#!/bin/bash
#
#
sa-update -D --channelfile /etc/mail/spamassassin/sare-sa-update-channels.txt --gpgkey 856AA88A &>/var/log/sa-updates.log

• Make it executable and add to cron:

chmod +x /usr/local/bin/update-sa
ln -s /usr/local/bin/update-sa /etc/cron.daily/
ln -s /usr/local/bin/update-sa /etc/cron.hourly/

Spamass-milter Setup

Basic Configuration

• Edit /etc/sysconfig/spamass-milter:

SOCKET=/var/run/spamass.sock
EXTRA_FLAGS="-m -r 8"

Patch

We need to patch the init file to fix the permissions of the socket created such that postfix is able to use the socket.

wget http://www.topdog-software.com/files/spamass-milter.patch
patch /etc/rc.d/init.d/spamass-milter < spamass-milter.patch

Apache Setup

Disable Modules

We will disable some modules that we are not using thus freeing up memory and also improving security.

• Edit /etc/httpd/conf/httpd.conf and comment out the modules as below.

#LoadModule ldap_module modules/mod_ldap.so
#LoadModule authnz_ldap_module modules/mod_authnz_ldap.so
#LoadModule dav_module modules/mod_dav.so
#LoadModule status_module modules/mod_status.so
#LoadModule dav_fs_module modules/mod_dav_fs.so
#LoadModule proxy_module modules/mod_proxy.so
#LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
#LoadModule proxy_ftp_module modules/mod_proxy_ftp.so
#LoadModule proxy_http_module modules/mod_proxy_http.so
#LoadModule proxy_connect_module modules/mod_proxy_connect.so
#LoadModule cache_module modules/mod_cache.so
#LoadModule disk_cache_module modules/mod_disk_cache.so
#LoadModule file_cache_module modules/mod_file_cache.so
#LoadModule mem_cache_module modules/mod_mem_cache.so

• Edit /etc/httpd/conf.d/proxy_ajp.conf and comment out as below:

#LoadModule proxy_ajp_module modules/mod_proxy_ajp.so

Listen To One IP For HTTPS

Apache has to be configured to listed to one address for port 443 as webmin will be using the same port. Edit /etc/httpd/conf.d/ssl:

Listen 192,168.1.6:443

Enable Gzip Compression

We setup gzip compression via the mod_deflate module to improve web server performance and to cut down on bandwidth usage by compressing responses to the client.

SetOutputFilter DEFLATE
BrowserMatch ^Mozilla/4 gzip-only-text/html
BrowserMatch ^Mozilla/4\.0[678] no-gzip
BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
SetEnvIfNoCase Request_URI \
\.(?:gif|jpe?g|png)$ no-gzip dont-vary
Header append Vary User-Agent env=!dont-vary

Set up logging for the deflate module:

DeflateFilterNote deflate_ratio
LogFormat "%v %h %l %u %t \"%r\" %>s %b mod_deflate: %{deflate_ratio}n pct." vhost_with_deflate_info
CustomLog logs/deflate_access_log vhost_with_deflate_info

Increase PHP Max Memory

Edit the file /etc/php.ini and set the following:

memory_limit = 64M

Enable Virtual Hosting

NameVirtualHost *:80

Create Default Virtual Host

This needs to be the first virtual host, it will be the default on the server the equivalent of the server with out virtual hosting.

<VirtualHost *:80>
        Servername localhost.localdomain
        Serveradmin root@localhost.localdomain
</Virtualhost>

Roundcube Webmail Setup

Create Database

• Create the database and add the roundcube user.

mysqladmin -p create roundcube
mysql -p
mysql> GRANT ALL ON roundcube.* TO roundcube@localhost IDENTIFIED BY 'password';

• Initialize the database:

mysql -u roundcube -p roundcube < /usr/share/doc/roundcube-0.1/SQL/mysql5.initial.sql

Basic Config

• Configure database DSN in /var/www/roundcube/config/db.inc.php:

$rcmail_config['db_dsnw'] = 'mysql://roundcube:password@localhost/roundcube';

• Configure roundcube in /var/www/roundcube/config/main.inc.php:

$rcmail_config['default_host'] = 'localhost';
$rcmail_config['default_port'] = 143;
$rcmail_config['virtuser_file'] = '/etc/postfix/virtual';
$rcmail_config['smtp_server'] = 'localhost';
$rcmail_config['smtp_port'] = 25;
$rcmail_config['smtp_helo_host'] = 'localhost';

Set Up Catch All Virtualhost

As we will be providing webmail for all domains that are created on the system we need to setup a catch all virtualhost that can display roundcube when ever a user accesses http://webmail.domainname. Edit /etc/httpd/conf/httpd.conf and append:

<VirtualHost *:80>
ServerName webmail.example.com
ServerAlias webmail.*
DocumentRoot /var/www/roundcube
<Directory /var/www/roundcube>
Options -Indexes IncludesNOEXEC FollowSymLinks
allow from all
</Directory>
</VirtualHost>

Firewall Setup

Introduction

This is a basic firewall it may not suit your needs, firewalling is an art so i recommend to read into it to improve on this basic one.

Basic Config

Add these rules in your configuration file /etc/sysconfig/iptables:

*raw
:PREROUTING ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
COMMIT
*nat
:PREROUTING ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
COMMIT
*mangle
:PREROUTING ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
COMMIT
*filter
:FORWARD DROP [0:0]
:INPUT DROP [0:0]
:OUTPUT DROP [0:0]
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 21 -j ACCEPT
-A INPUT -p tcp -m multiport -j ACCEPT --dports 80,443,25,110,143,53
-A INPUT -p udp -m udp --dport 53 -j ACCEPT
-A INPUT -p icmp -m icmp -m limit --icmp-type 8 --limit 5/min -j ACCEPT
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A OUTPUT -s 127.0.0.1 -j ACCEPT
-A OUTPUT -s 192.168.1.5 -j ACCEPT
-A OUTPUT -s 192.168.1.6 -j ACCEPT
COMMIT

Activate Config

service iptables restart