#!/bin/bash

## VARIÁVEIS QUE VÃO CONTROLAR AS INTERFACES DE ENTRADA E SAÍDA

echo "CARREGANDO FIREWALL"

echo -n "LIMPANDO TUDO........................."

INTERNET="eth0"
REDE_INTERNA="eth1" 

## PORTA PARA INPUT E OUTPUT DE SERVIÇOS ( liberadas )

TCP_PORT="443,80,3128,20,21,1863,33434,25,110,6088,2631,5900,4899,1449"
UDP_PORT="80,443,53,25,110,60712"
VNC="5900" 
RADMIN="4899"
EMULE_TCP="6088" 
EMULE_UDP="60712"
#CAIXA_PORT="2631"
#VPN="1723" 

## CONECTIVIDADE SOCIAL

#BANCO_BRASIL=200.200.200.200
#BANCO_CENTRAL=200.200.200.201
CAIXA_01="200.201.174.204"
CAIXA_02="200.201.174.207"

## PORTA PARA INPUT E OUTPUT DE SERVIÇOS ( bloqueio )

SAMBA_PORT="137,138,139"

### Carregando os modulos 
### fazer NAT de forma que haja compartilhamento na conexao

/sbin/modprobe iptable_nat

### resolvendo problema com ftp

/sbin/modprobe ip_conntrack
/sbin/modprobe ip_conntrack_ftp
/sbin/modprobe ip_nat_ftp

### utlizado nas opções que geram log.

/sbin/modprobe ipt_LOG
/sbin/modprobe ipt_REJECT
/sbin/modprobe ipt_MASQUERADE

### Zerar regras

iptables -F
iptables -X
iptables -F -t nat
iptables -X -t nat
iptables -F -t mangle
iptables -X -t mangle
iptables -t filter -P INPUT DROP
iptables -t filter -P OUTPUT DROP
iptables -t filter -P FORWARD DROP

echo "[OK]"

echo -n "ACEITANDO POLÍTICAS..................."

#### Filtros - DROP nos pacotes TCP indesejáveis
  
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

## Drop proxy 

#iptables -A INPUT -s 192.168.0.0/24 -d 165.228.132.10 -j DROP
#iptables -A OUTPUT -d 192.168.0.0/24 -s 165.228.132.10 -j DROP
#iptables -A FORWARD -s 192.168.0.0/24 -d 165.228.132.10 -j DROP
#iptables -A FORWARD -d 192.168.0.0/24 -s 165.228.132.10 -j DROP


#### ACCEPT (libera) pacotes de retorno da internet

iptables -A INPUT -i ! $INTERNET -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 -m state --state ESTABLISHED,RELATED,NEW -j ACCEPT

### Fechando as portas do samba, caso o servidor samba fique de cara para a internet.
  
iptables -A INPUT -p tcp -s 0/0 -m multiport --dport $SAMBA_PORT -j REJECT 
iptables -A INPUT -p udp -s 0/0 -m multiport --dport $SAMBA_PORT -j REJECT 

### Abrindo as portas do Samba só pra rede Interna

iptables -A INPUT -p tcp -i $REDE_INTERNA -m multiport --dport $SAMBA_PORT -j ACCEPT
iptables -A INPUT -p udp -i $REDE_INTERNA -m multiport --dport $SAMBA_PORT -j ACCEPT
iptables -A INPUT -p tcp -i $REDE_INTERNA --destination-port 139 -j ACCEPT
iptables -A INPUT -p udp -i $REDE_INTERNA --destination-port 139 -j ACCEPT

echo "[OK]"

echo -n "LIBERAR ENTRADA......................."

### Permitir conexão vinda da minha rede interna:" que vem de dentro e quer sair" via vnc, ssh (putty), vpn

iptables -A INPUT -p tcp -s 0/0 -m multiport --dport $TCP_PORT -j ACCEPT
iptables -A OUTPUT -p tcp -d 0/0 -m multiport --sport $TCP_PORT -j ACCEPT
iptables -A INPUT -p udp -s 0/0 -m multiport --dport $UDP_PORT -j ACCEPT
iptables -A OUTPUT -p udp -d 0/0 -m multiport --sport $UDP_PORT -j ACCEPT

# E-MAIL ENVIAR E RECEBER

#iptables -A INPUT -p tcp -s 192.168.0.10 --dport 25 -j ACCEPT
#iptables -A OUTPUT -p tcp -d 192.168.0.10 --sport 25 -j ACCEPT

#iptables -A INPUT -p tcp -s 192.168.0.10 --dport 110 -j ACCEPT
#iptables -A OUTPUT -p tcp -d 192.168.0.10 --sport 110 -j ACCEPT

#iptables -A INPUT -p 47 -s 0/0 -j ACCEPT
#iptables -A OUTPUT -p 47 -d 0/0 -j ACCEPT

iptables -A INPUT -p tcp -s 192.168.0.94 -d $CAIXA_01 -j ACCEPT
iptables -A OUTPUT -p tcp -d $CAIXA_01 -s 192.168.0.94 -j ACCEPT

iptables -A INPUT -p tcp -s 192.168.0.94 -d $CAIXA_02 -j ACCEPT
iptables -A OUTPUT -p tcp -d $CAIXA_02 -s 192.168.0.94 -j ACCEPT

#iptables -A INPUT -p tcp -s 192.168.0.0/24 -d $BANCO_BRASIL -j ACCEPT
#iptables -A OUTPUT -p tcp -d $BANCO_BRASIL -s 192.168.0.0/24 -j ACCEPT


iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT
iptables -A INPUT -p icmp -j ACCEPT
iptables -A OUTPUT -p icmp -j ACCEPT
iptables -A FORWARD -p icmp -j ACCEPT

echo "[OK]"

echo -n "NAT INTERNO..........................."

###  Redireciona portas para a máquina WinXP
### VNC

iptables -A FORWARD -i $REDE_INTERNA -o $REDE_INTERNA -p tcp --dport $VNC -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -i $INTERNET -o $INTERNET -p tcp --dport $VNC -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -i $INTERNET -o $REDE_INTERNA -p tcp --dport $VNC -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -i $REDE_INTERNA -o $INTERNET -p tcp --dport $VNC -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -t nat -A PREROUTING -p tcp -i $INTERNET --dport $VNC -j DNAT --to 192.168.0.50:5900
#iptables -t nat -A PREROUTING -p tcp -i $INTERNET -m multiport --dport $VNC -j DNAT --to 192.168.0.95:5800

### RADMIN

iptables -A FORWARD -i $REDE_INTERNA -o $REDE_INTERNA -p tcp --dport $RADMIN -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -i $INTERNET -o $INTERNET -p tcp --dport $RADMIN -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -i $REDE_INTERNA -o $INTERNET -p tcp --dport $RADMIN -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -i $INTERNET -o $REDE_INTERNA -p tcp --dport $RADMIN -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -t nat -A PREROUTING -p tcp -i $INTERNET --dport $RADMIN -j DNAT --to 192.168.0.50:4899

### EMULE

iptables -A FORWARD -i $REDE_INTERNA -o $REDE_INTERNA -p tcp --dport $EMULE_TCP -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -i $INTERNET -o $INTERNET -p tcp --dport $EMULE_TCP -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -i $REDE_INTERNA -o $INTERNET -p tcp --dport $EMULE_TCP -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -i $INTERNET -o $REDE_INTERNA -p tcp --dport $EMULE_TCP -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -t nat -A PREROUTING -p tcp -i $INTERNET --dport $EMULE_TCP -j DNAT --to 192.168.0.86:6088


iptables -A FORWARD -i $REDE_INTERNA -o $REDE_INTERNA -p tcp --dport $EMULE_UDP -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -i $INTERNET -o $INTERNET -p tcp --dport $EMULE_UDP -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -i $REDE_INTERNA -o $INTERNET -p tcp --dport $EMULE_UDP -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -i $INTERNET -o $REDE_INTERNA -p tcp --dport $EMULE_UDP -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -t nat -A PREROUTING -p tcp -i $INTERNET --dport $EMULE_UDP -j DNAT --to 192.168.0.86:60712

### VPN

#iptables -A FORWARD -i $REDE_INTERNA -o $REDE_INTERNA -p tcp --dport $VPN -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
#iptables -A FORWARD -i $INTERNET -o $INTERNET -p tcp --dport $VPN -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
#iptables -A FORWARD -i $REDE_INTERNA -o $INTERNET -p tcp --dport $VPN -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
#iptables -A FORWARD -i $INTERNET -o $REDE_INTERNA -p tcp --dport $VPN -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
#iptables -t nat -A PREROUTING -p tcp -i $INTERNET --dport $VPN -j DNAT --to 192.168.0.10:1723

echo "[OK]"

echo -n "CONECTIVIDADE SOCIAL.................."

# BANCO_BRASIL

#iptables -A FORWARD -p tcp -s 192.168.0.0/24 -d $BANCO_BRASIL -j ACCEPT
#iptables -A FORWARD -p tcp -d 192.168.0.0/24 -s $BANCO_BRASIL -j ACCEPT

# BANCO_CENTRAL

#iptables -A FORWARD -p tcp -s 192.168.0.0/24 -d $BANCO_CENTRAL -j ACCEPT
#iptables -A FORWARD -p tcp -d 192.168.0.0/24 -s $BANCO_CENTRAL -j ACCEPT



#iptables -A INPUT -s 192.168.0.0/24 -d 165.228.132.10 -j DROP
#iptables -A OUTPUT -d 192.168.0.0/24 -s 165.228.132.10 -j DROP
#iptables -A FORWARD -s 192.168.0.0/24 -d 165.228.132.10 -j DROP
#iptables -A FORWARD -d 192.168.0.0/24 -s 165.228.132.10 -j DROP

# Conectividade Social

#iptables -A FORWARD -i $REDE_INTERNA -o $REDE_INTERNA -p tcp --dport $CAIXA_PORT -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
#iptables -A FORWARD -i $INTERNET -o $INTERNET -p tcp --dport $CAIXA_PORT -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
#iptables -A FORWARD -i $REDE_INTERNA -o $INTERNET -p tcp --dport $CAIXA_PORT -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
#iptables -A FORWARD -i $INTERNET -o $REDE_INTERNA -p tcp --dport $CAIXA_PORT -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
#iptables -t nat -A PREROUTING -p tcp -i $INTERNET --dport $CAIXA_PORT -j DNAT --to 192.168.0.94:2631

# CAIXA
#
iptables -A FORWARD -p tcp -s 192.168.0.94 -d $CAIXA_01 --dport 80 -j ACCEPT
iptables -A FORWARD -p tcp -s 192.168.0.94 -d $CAIXA_02 --dport 80 -j ACCEPT
iptables -A FORWARD -p tcp -s 192.168.0.94 -d $CAIXA_01 --dport 2631 -j ACCEPT
iptables -A FORWARD -p tcp -s 192.168.0.94 -d $CAIXA_02 --dport 2631 -j ACCEPT



# CAIXA
#iptables -t nat -A PREROUTING -i $REDE_INTERNA -d $CAIXA -j ACCEPT

echo "[OK]"

echo -n "INTERNET OK..........................."

### redireciona o trafego da porta 80 para 3128, execeto a estacao 
### com IP 192.168.0.99 pq nessa maquina vai roda o servidor VPN



iptables -t nat -A PREROUTING -i $REDE_INTERNA -s \! 192.168.0.10 -p tcp -m multiport  --dport 80,443 -j REDIRECT --to-ports 3128
iptables -t nat -A PREROUTING -s 192.168.0.10 -d 0.0.0.0/0  -j ACCEPT

### NAT para a rede interna " liberar internet para rede interna"
   
iptables -t nat -A POSTROUTING -o $INTERNET -j MASQUERADE

### Ativando o Roteamento

echo "1" > /proc/sys/net/ipv4/ip_forward

echo "[OK]"

echo "FIREWALL CARREGADO"