Firewall bem fechado

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echo "Ativando Firewall"

echo "Ativando Dispositivos"
#-------------------------------------------------
EXTERNA=eth1
INTERNA=eth0
REDELOCAL=192.168.1.0/24


echo "Ativando Módulos"
#--------------------------------------------------
modprobe iptable_nat
modprobe ip_nat_ftp
modprobe ip_conntrack_ftp
modprobe ipt_LOG
modprobe ipt_REJECT
modprobe ipt_MASQUERADE
modprobe iptable_mangle
modprobe iptable_filter
modprobe ipt_TOS


echo "Limpando Regras"
#--------------------------------------------------
iptables -F
iptables -X
iptables -F -t nat
iptables -X -t nat
iptables -F -t mangle
iptables -X -t mangle
iptables -F POSTROUTING -t nat
iptables -F PREROUTING -t nat


echo "Aplicando Regras"
#--------------------------------------------------
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT ACCEPT


echo "Aceitando retorno da internet"
#--------------------------------------------------
iptables -A INPUT -i ! $EXTERNA -j ACCEPT
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A OUTPUT -m state --state ESTABLISHED,RELATED,NEW -j ACCEPT
iptables -A FORWARD -o $INTERNA -m state --state ESTABLISHED,RELATED,NEW -j ACCEPT


echo "Ativando roteamento"
#-------------------------------------------------
echo "1" > /proc/sys/net/ipv4/ip_forward


echo "Ativando Squid Local"
#-------------------------------------------------
iptables -A INPUT -p tcp --dport 3128 -i $INTERNA -j ACCEPT


echo "Mascarando Roteador"
#---------------------------------------------------
iptables -t nat -A POSTROUTING -s $REDELOCAL -o $EXTERNA -j MASQUERADE


echo "Ativando Proxy Transparente"
#---------------------------------------------------
iptables -t nat -A PREROUTING -i $INTERNA -p tcp --dport 80 -j REDIRECT --to-port 3128


echo "Acelerando Conexão"
#--------------------------------------------------
iptables -t mangle -A OUTPUT -p tcp -j TOS --sport 80 --set-tos 0x08
iptables -t mangle -A PREROUTING -p tcp --dport 80 -j TOS  --set-tos 0x08
iptables -t mangle -A OUTPUT -p tcp -j TOS --sport 80 --set-tos 0x10


echo "Abrindo portas externa"
#--------------------------------------------------
iptables -A FORWARD -i $EXTERNA -p tcp --dport https -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p tcp --dport www -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p tcp --dport domain -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p udp --dport domain -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p tcp --dport ftp -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p tcp --dport ftp-data -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p tcp --dport ssh -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p tcp --dport 25 -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p udp --dport 25 -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p tcp --dport 110 -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p udp --dport 110 -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p tcp --dport ntp -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p udp --dport ntp -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p tcp --dport 3389 -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p udp --dport 3389 -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p tcp --dport 143 -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p udp --dport 143 -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p tcp --dport 465 -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p tcp --dport 446 -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p udp --dport 446 -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p tcp --dport 995 -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p tcp --dport 5800:5900 -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p udp --dport 5800:5900 -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p tcp --dport 5801:5901 -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p udp --dport 5801:5901 -j ACCEPT


echo "Abrindo portas internas"
#--------------------------------------------------
iptables -A FORWARD -i $INTERNA -p tcp --dport https -j ACCEPT
iptables -A FORWARD -i $INTERNA -p tcp --dport domain -j ACCEPT
iptables -A FORWARD -i $INTERNA -p udp --dport domain -j ACCEPT
iptables -A FORWARD -i $INTERNA -p tcp --dport ftp -j ACCEPT
iptables -A FORWARD -i $INTERNA -p tcp --dport ftp-data -j ACCEPT
iptables -A FORWARD -i $INTERNA -p tcp --dport ssh -j ACCEPT
iptables -A FORWARD -i $INTERNA -p tcp --dport 25 -j ACCEPT
iptables -A FORWARD -i $INTERNA -p udp --dport 25 -j ACCEPT
iptables -A FORWARD -i $INTERNA -p tcp --dport 110 -j ACCEPT
iptables -A FORWARD -i $INTERNA -p udp --dport 110 -j ACCEPT
iptables -A FORWARD -i $INTERNA -p tcp --dport ntp -j ACCEPT
iptables -A FORWARD -i $INTERNA -p udp --dport ntp -j ACCEPT
iptables -A FORWARD -i $INTERNA -p tcp --dport 3389 -j ACCEPT
iptables -A FORWARD -i $INTERNA -p udp --dport 3389 -j ACCEPT
iptables -A FORWARD -i $INTERNA -p tcp --dport 143 -j ACCEPT
iptables -A FORWARD -i $INTERNA -p udp --dport 143 -j ACCEPT
iptables -A FORWARD -i $INTERNA -p tcp --dport 465 -j ACCEPT
iptables -A FORWARD -i $INTERNA -p tcp --dport 446 -j ACCEPT
iptables -A FORWARD -i $INTERNA -p udp --dport 446 -j ACCEPT
iptables -A FORWARD -i $INTERNA -p tcp --dport 995 -j ACCEPT
iptables -A FORWARD -i $INTERNA -p tcp --dport 5800:5900 -j ACCEPT
iptables -A FORWARD -i $INTERNA -p udp --dport 5800:5900 -j ACCEPT
iptables -A FORWARD -i $INTERNA -p tcp --dport 5801:5901 -j ACCEPT
iptables -A FORWARD -i $INTERNA -p udp --dport 5801:5901 -j ACCEPT
iptables -A FORWARD -i $INTERNA -p tcp --dport 10000 -j ACCEPT
iptables -A FORWARD -i $INTERNA -p udp --dport 10000 -j ACCEPT


echo "Liberando Conectividade Social"
#--------------------------------------------------
iptables -t nat -A PREROUTING -p tcp -d 200.201.0.0/16 -j ACCEPT
iptables -A FORWARD -p tcp -d 200.201.0.0/16 -j ACCEPT


echo "Redirecionando VNC"
#--------------------------------------------------
iptables -A FORWARD -i $EXTERNA -p tcp --dport 5800:5900 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -i $EXTERNA -p udp --dport 5800:5900 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -t nat -A PREROUTING -p tcp -i $EXTERNA --dport 5800:5900 -j DNAT --to 192.168.1.4:5800-5900
iptables -t nat -A PREROUTING -p udp -i $EXTERNA --dport 5800:5900 -j DNAT --to 192.168.1.4:5800-5900

iptables -A FORWARD -i $INTERNA -p tcp --dport 5800:5900 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -i $INTERNA -p udp --dport 5800:5900 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -t nat -A PREROUTING -p tcp -i $INTERNA --dport 5800:5900 -j DNAT --to 192.168.1.4:5800-5900
iptables -t nat -A PREROUTING -p udp -i $INTERNA --dport 5900:5900 -j DNAT --to 192.168.1.4:5800-5900


echo "Aplicando Proteção contra Spoofing"
#--------------------------------------------------
for i in /proc/sys/net/ipv4/conf/*/rp_filter; do
echo "1" > $i
done


echo "Aplicando Proteção contra Syn-flood e ataque DoS"
#--------------------------------------------------
iptables -A FORWARD -p tcp --syn -m limit --limit 1/s -j ACCEPT


echo "Aplicando Proteção contra ping da morte"
#--------------------------------------------------
iptables -A FORWARD -p icmp --icmp-type echo-request -m limit --limit 1/s -j ACCEPT
iptables -A FORWARD -p icmp --icmp-type echo-request -j DROP
echo "0" > /proc/sys/net/ipv4/icmp_echo_ignore_all


echo "Aplicando Proteção contra ataques"
#--------------------------------------------------
iptables -A INPUT -m state --state INVALID -j DROP


echo "Aplicando Proteção contra pacotes danificados"
#--------------------------------------------------
iptables -A INPUT -p icmp -s 192.168.1.1/24 -j DROP


echo "Aplicando proteção nos pacotes TCP indesejaveis"
#---------------------------------------------------
iptables -A FORWARD -p tcp ! --syn -m state --state NEW -j LOG --log-level 6 --log-prefix "FIREWALL: NEW sem syn: "
iptables -A FORWARD -p tcp ! --syn -m state --state NEW -j DROP


echo "Bloqueando Point-to-Point"
#--------------------------------------------------
#--> AIM
iptables -A FORWARD -d login.oscar.aol.com -j DROP

#--> ICQ
iptables -A FORWARD -p TCP --dport 5190 -j DROP
iptables -A FORWARD -d login.icq.com -j DROP

#--> MSN
iptables -A FORWARD -p tcp --dport 1863 -j DROP
iptables -A FORWARD -d 64.4.13.0/24 -j DROP
iptables -A FORWARD -p tcp -d 65.54.239.0/24 -j DROP

#--> Bittorrent
iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 6881:6889 -j DNAT --to-dest 192.168.1.1
iptables -A FORWARD -p TCP -i eth1 --dport 6881:6889 -d 192.168.1.1 -j DROP

#--> iMesh
iptables -A FORWARD -d 216.35.208.0/24 -j DROP

#--> BearShare ToadNode
iptables -A FORWARD -p TCP --dport 6346 -j DROP

#--> WinMX
iptables -A FORWARD -d 209.61.186.0/24 -j DROP
iptables -A FORWARD -d 64.49.201.0/24 -j DROP

#--> Napigator
iptables -A FORWARD -d 209.25.178.0/24 -j DROP

#--> Morpheus
iptables -A FORWARD -s 0/0 -d 206.142.53.0/24 -j DROP
iptables -A FORWARD -s 0/0 -p TCP --dport 1214 -j DROP
iptables -A INPUT -s 0/0 -d 206.142.53.0/24 -j DROP
iptables -A INPUT -s 0/0 -p TCP --dport 1214 -j DROP
iptables -A OUTPUT -s 0/0 -d 206.142.53.0/24 -j DROP
iptables -A OUTPUT -s 0/0 -p TCP --dport 1214 -j DROP

#--> Kazaa
iptables -A FORWARD -s 192.168.1.0/24 -d 213.248.112.0/24 -j DROP
iptables -A FORWARD -s 192.168.1.0/24 -p TCP --dport 1214 -j DROP
iptables -A INPUT -s 192.168.1.0/24 -d 213.248.112.0/24 -j DROP
iptables -A INPUT -s 192.168.1.0/24 -p TCP --dport 1214 -j DROP
iptables -A OUTPUT -s 192.168.1.0/24 -d 213.248.112.0/24 -j DROP
iptables -A OUTPUT -s 192.168.1.0/24 -p TCP --dport 1214 -j DROP

#--> Limewire
iptables -A FORWARD -p TCP --dport 6346 -j DROP

#--> Audiogalaxy
iptables -A FORWARD -d 64.245.58.0/23 -j DROP

#--> Shareaza
iptables -A FORWARD -s 192.168.1.0/24 -p tcp --dport 6346 -j DROP
iptables -A FORWARD -s 192.168.1.0/24 -p udp --dport 6346 -j DROP
iptables -A INPUT -s 192.168.1.0/24 -p tcp --dport 6346 -j DROP
iptables -A INPUT -s 192.168.1.0/24 -p udp --dport 6346 -j DROP
iptables -A OUTPUT -s 192.168.1.0/24 -p tcp --dport 6346 -j DROP
iptables -A OUTPUT -s 192.168.1.0/24 -p udp --dport 6346 -j DROP


echo "Trocando Portas"
#--------------------------------------------------
PORT_INI=61000
PORT_FIM=65095
echo $PORT_INI $PORT_FIM > /proc/sys/net/ipv4/ip_local_port_range


echo "Bloqueando pocotes não liberados"
#---------------------------------------------------
iptables -A FORWARD -j DROP
iptables -A INPUT -j DROP

echo
echo "Firewall Ativo!"

Gerenciamento de espaço em disco

Validar memória RAM e swap

Configurando CISCO por Shell Script

Verifica quais ports necessitam de atualização

Troca de link em caso de queda de Internet (FAILOVER)

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