Ya tienes Linux funcionando y puedes entrar a las paginas de internet pero….. alguien mas podría entrar a mi maquina ….. aquí tenemos una forma simple de instalar un firewall.
Vamos a explicar la manera fácil y rápida de poder poner tu firewall a funcionar en tan solo 1 minuto.
Primero verifica si tienes {es:iptables} instalado, si no lo tienes usas este código para instalarlo abres el Terminal y escribes:
sudo apt-get install iptables
Después usando el editor de tu preferencia (nano, pico, vi, gedit etc.) harás un script y lo pondrás en “/opt/scripts” y lo vas a llamar “iptables.script”
por ejemplo:
sudo gedit /opt/scripts/iptables.script
El código que pondrás sera:
#!/bin/bash
# descarga todos los enlaces
iptables -F# prepara las reglas de cada enlase pre-definido
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD DROP# permite coneccion establecidas por paquetes que vienen de otras computadoras
iptables -A INPUT -m state –state RELATED,ESTABLISHED -j ACCEPT# no permite que nada mas entre
iptables -A INPUT -i eth+ -p udp -j DROP
iptables -A INPUT -i eth+ -p tcp -m tcp –syn -j DROP# acepta todo de localhost
iptables -A INPUT -i lo -j ACCEPT
Después que este guardado activas el iptables y sabrás si esta funcionando usando:
sudo iptables -L -V
Después generas otro pequeño “init script” para poder activarlo en “/etc/init.d/firewall” este sera el comando que pondras:
sudo gedit /etc/init.d/firewall
Dentro de este archivo colocas el siguiente codigo:
#!/bin/bash
if [[ $1 == start ]] ; then
sudo /opt/scripts/iptables.script
else
sudo iptables -F
fi
Por ultimo lo sincronizas con /etc/rc.* usando las herramientas de “update-rc.d” para que el firewall se active antes que el network:
update-rc.d firewall start 20 2 3 4 5 . stop 99 0 1 6
Y aquí tendrás un firewall simple para que tu computadora este mas segura (no es recomendable para los servidores ya que no dejara que ningún paquete entre).
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