File squirrelmail.conf24 of Package squirrelmail-beta
<Directory "/srv/www/htdocs/squirrelmail">
php_admin_flag register_globals Off
php_admin_flag magic_quotes_gpc Off
php_admin_flag allow_url_include Off
php_admin_flag allow_url_fopen Off
php_admin_flag session.use_only_cookies On
php_admin_flag session.cookie_httponly On
php_admin_value open_basedir "/srv/www/htdocs/squirrelmail:/var/lib/squirrelmail:/usr/share/php5/PEAR:/tmp"
php_admin_value upload_tmp_dir /var/lib/squirrelmail/attach/
</Directory>
<Directory "/srv/www/htdocs/squirrelmail/class">
Require all denied
</Directory>
<Directory "/srv/www/htdocs/squirrelmail/config">
Require all denied
</Directory>
<Directory "/srv/www/htdocs/squirrelmail/data">
Require all denied
</Directory>
<Directory "/srv/www/htdocs/squirrelmail/doc">
Require ip 127.0.0.0/8
Require ip 10.0.0.0/8
Require ip 192.0.0.0/8
</Directory>
<Directory "/srv/www/htdocs/squirrelmail/functions">
Require all denied
</Directory>
<Directory "/srv/www/htdocs/squirrelmail/help">
Require all denied
</Directory>
<Directory "/srv/www/htdocs/squirrelmail/include">
Require all denied
</Directory>
<Directory "/srv/www/htdocs/squirrelmail/locale">
Require all denied
</Directory>
<Directory "/srv/www/htdocs/squirrelmail/po">
Require all denied
</Directory>
<Directory "/srv/www/htdocs/squirrelmail/themes">
Require all denied
</Directory>
<Directory "/srv/www/htdocs/squirrelmail/themes/css">
Require all granted
</Directory>