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Configura��o do shorewall
=========================
De in�cio, instale o shorewall:
apt-get install shorewall
� necess�rio que o iptables esteja configurado para encaminhar os pacotes de uma porta externa para os vservers. As seguinte diretiva precisa ser alterada na configura��o original no arquivo `/etc/shorewall/shorewall.conf`:
IP_FORWARDING=Yes
O arquivo `/etc/shorewall/interfaces` deve conter a interface de rede:
#ZONE INTERFACE BROADCAST OPTIONS
- eth0 detect tcpflags,blacklist,routefilter,nosmurfs,logmartians,norfc1918
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE
O arquivo `/etc/shorewall/zones` deve conter as zonas da rede:
###############################################################################
#ZONE TYPE OPTIONS IN OUT
# OPTIONS OPTIONS
fw firewall
vm ipv4
net ipv4
#LAST LINE - ADD YOUR ENTRIES ABOVE THIS ONE - DO NOT REMOVE
O arquivo `/etc/shorewall/hosts` associa zonas a subredes:
#ZONE HOST(S) OPTIONS
vm eth0:192.168.0.0/24
net eth0:0.0.0.0/0
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS LINE -- DO NOT REMOVE
O arquivo `/etc/shorewall/policy` define as regras para tr�fego de pacotes:
###############################################################################
#SOURCE DEST POLICY LOG LIMIT:BURST
# LEVEL
vm net ACCEPT
$FW net ACCEPT
$FW vm ACCEPT
net all DROP info
# THE FOLLOWING POLICY MUST BE LAST
all all REJECT info
#LAST LINE -- DO NOT REMOVE
E o arquivo `/etc/shorewall/rules` define exce��es �s regras gerais:
################################################################
#ACTION SOURCE DEST PROTO DEST
SSH/ACCEPT net $FW
Ping/ACCEPT net $FW
HTTP/ACCEPT net $FW
HTTPS/ACCEPT net $FW
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE
Adicionamos m�scaras NAT aos pacotes da rede interna atrav�s do `/etc/shorewall/masq`:
###############################################################################
#INTERFACE SOURCE ADDRESS PROTO PORT(S) IPSEC MARK
eth0:!192.168.0.0/24 192.168.0.0/24
#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE
Habilite o shorewall mudando o valor de startup de `/etc/default/shorewall` para `1`:
startup=1
Finalmente podemos ligar o shorewall:
/etc/init.d/shorewall start
Shorewall e Puppet
==================
Uma vez que um nodo [puppetmaster](../puppet) estiver rodando, o m�dulo [puppet-shorewall](http://git.sarava.org/?p=puppet-shorewall.git;a=summary) poder� ser utilizado para gerenciar o firewall. No entanto, se voc� for substituir o presente procedimento pela sua vers�o via puppet, certifique-se de apagar os arquivos `/etc/shorewall/{masq,policy,zones,rules,interfaces}`.
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