[CentOS-pt-br] Iptables!

João Paulo Ferreira jferreira.ba em gmail.com
Quarta Setembro 7 02:51:26 UTC 2016


iptables -t filter -I FORWARD -d 177.135.260.61 -p tcp -m multiport --dport
3051,5836,5837,725 -j ACCEPT
iptables -t filter -I FORWARD -d 177.135.260.61 -p udp -m multiport --dport
3051,5836,5837,725 -j ACCEPT

Como você não informou o protocolo da camada de transporte estou colocando
a regra para UDP e TCP.

Atenciosamente,

*João Paulo Ferreira*
*B.S. Ciência da Computação* - UNIVERSIDADE SALVADOR
*Esp. Redes de Computadores e Telecomunicações* - UNIVERSIDADE SALVADOR
*Novell Certified Linux Administrator* - NOVELL
*Certified Linux Professional Institute *- LPI
*CompTIA Linux+* - COMPTIA
*Mikrotik Certified Network Associate* - MIKROTIK
Cel.: +55 (71) 9918-1235 VIVO
Cel.: +55 (71) 8837-7080 OI
Skype.: joaopaulo.cf
G-Talk/Mail: jferreira.ba em gmail.com

Em 6 de setembro de 2016 14:03, Glenio Cortes Himmen <
glenio.11622x em aparecida.go.gov.br> escreveu:

> Sou novo com IPTABLES e SQUID, preciso liberar um determinado programa
> para acessar o endereço e portas abaixo relacionados sem passar pelo proxy.
>
> 177.135.260.61:3051
> 177.135.250.61:5836
> 177.135.250.61:5837
> 177.135.250.61:725
>
> As requisições de saída sairão do IP 172.16.0.48/255.255.255.192.
>
> Abaixo o script firewall.sh que utilizo.
>
> #!/bin/bash
> #___________.__________________________      __  _____  .____    .____
> #\_   _____/|   \______   \_   _____/  \    /  \/  _  \ |    |   |    |
> # |    __)  |   ||       _/|    __)_\   \/\/   /  /_\  \|    |   |    |
> # |     \   |   ||    |   \|        \\        /    |    \    |___|    |___
> # \___  /   |___||____|_  /_______  / \__/\  /\____|__  /_______ \_______ \
> #     \/                \/        \/       \/         \/        \/       \/
> #####################################################################
> #                          VARIAVEIS
> #####################################################################
> #   -d ip de destino - rede destino - ip da rede 192.168.2.1
> 192.168.0.0/24
> #   -s ip de origem - rede de origem - ip da internet
> #   --sport NUMERO   porta origem
> #   --dport NUMERO   porta destino
> #   -j ACAO
> LOG_OPTIONS="--log-tcp-sequence --log-ip-options --log-tcp-options
> --log-level info"
> IPT="/sbin/iptables"
> ### INTERFACE DA REDE EXTERNA INTERNET
> IF_EXT="eth0"
>
> ### INTERFACE DA REDE INTERNA LAN
> IF_INT="eth1"
>
> ### REDE INTERNA
> REDE_INTERNA="172.16.0.0/26"
>
> ### PORTAS LIBERADAS TCP INPUT
> PORTAS_REDE_INTERNA="23 25 53 137 443 8080 1194 2928 3128 3389 80"
>
> ### PORTAS LIBERADAS UDP INPUT
> PORTAS_UDP="53 161 3128"
>
> ### Portas liberadas de fora internet para a rede interna
> PORTAS_FORWARD="23 25 53 443 8080 137 1194 2928 3389 3128"
>
> # ======== FORWARD LIBERADO PARA IP EXTERNO
> IP_FORWARD_EXTERNO="
> 189.2.188.173
> 187.5.111.45
> "
> ### FORWARD LIBERADO PARA IP DA REDE INTERNA
> ### Informar os IP's da rede interna que poderão passar sem configurar o
> proxy
> IP_FORWARD_INTERNO="
> 172.16.0.3
> 172.16.0.7
> 172.16.0.25
> 172.16.0.11
> 172.16.0.50
> 172.16.0.47
> 172.16.0.38
> 172.16.0.61
> 172.16.0.24
> 172.16.0.10
> 172.16.0.9
> 172.16.0.49
> 172.16.0.18
> 172.16.0.15
> 172.16.0.36
> 172.16.0.51
> 172.16.0.39
> 172.16.0.45
> 172.16.0.29
> 172.16.0.36
> "
> echo "INICIANDO FIREWALL ...................[OK]"
> #####################################################################
> #                       MODULOS
> #####################################################################
> /sbin/modprobe ip_conntrack
> /sbin/modprobe ip_conntrack_ftp
> /sbin/modprobe ip_nat_ftp
> /sbin/modprobe iptable_nat
> /sbin/modprobe ipt_tos
> /sbin/modprobe ipt_MASQUERADE
>
> echo "LIMPANDO AS REGRAS ...................[OK]"
> ### APAGANDO REGRAS PADRAO
> $IPT -F
> $IPT -t nat -F
> $IPT -t mangle -F
>
> ### APAGANDO CHAINS
> $IPT -X
> $IPT -t nat -X
> $IPT -t mangle -X
>
> ### ZERANDO CONTADORES
> $IPT -Z
> $IPT -t nat -Z
> $IPT -t mangle -Z
>
> echo "APLICADO REGRAS PADRÕES ..............[OK]"
> ######################################################################
> #                       REGRAS PADROES
> ######################################################################
> $IPT -P INPUT DROP
> $IPT -P FORWARD DROP
> $IPT -P OUTPUT ACCEPT
>
> ### HABILITANDO ROTEAMENTO NO KERNEL
> echo "1" > /proc/sys/net/ipv4/ip_forward
>
> ######################################################################
> #                       REGRAS DE NAT
> ######################################################################
> ### COMPARTILHAR INTERNET
>
> #$IPT -t nat -A POSTROUTING -s $REDE_INTERNA -o $IF_EXT -j MASQUERADE
> $IPT -t nat -A POSTROUTING -o $IF_EXT -j MASQUERADE
>
> #Redirecionar 443 para 3128
> #$IPT -t nat -A PREROUTING -p tcp --dport 443 -j REDIRECT --to-ports 3128
>
> ### PROXY TRANSPARENTE
> #$IPT -t nat -A PREROUTING -i $IF_EXT -p tcp --dport 80 -j DNAT --to
> 10.1.1.1:3128
> #$IPT -t nat -A PREROUTING -i $IF_INT -p tcp --dport 80 -j REDIRECT
> --to-port 3128
>
> ### REDIRECIONAR ACESSO EXTERNO RDP PARA HOST INTERNO
> #$IPT -t nat -A PREROUTING -i $IF_EXT -p tcp --dport 3389 -j DNAT
> --to-destination 10.1.1.54:3389
> #$IPT -t filter -A FORWARD -i $IF_EXT -d 10.1.1.54 -p tcp --dport 3389 -j
> ACCEPT
>
> echo "APLICANDO REGRAS MANUAIS .............[OK]"
> #####################################################################
> #                       REGRAS INPUT
> #####################################################################
> $IPT -t filter -A INPUT -p tcp -i lo -j ACCEPT
> $IPT -t filter -A INPUT -p icmp -j ACCEPT
> $IPT -t filter -A INPUT -p tcp --dport 443 -j DROP
>
> for i in $PORTAS_REDE_INTERNA; do
>         $IPT -t filter -A INPUT -p tcp --dport $i -j ACCEPT
> done
>
> for i in $PORTAS_UDP; do
>         $IPT -A INPUT -p udp --dport $i -j ACCEPT
> done
>
> $IPT -t filter -A INPUT -m state --state INVALID,RELATED,ESTABLISHED -j
> ACCEPT
> $IPT -t filter -A INPUT -j LOG $LOG_OPTIONS --log-prefix "LOG_INPUT"
> $IPT -t filter -A INPUT -j DROP
>
> #####################################################################
> #                       REGRAS DE FORWARD
> #####################################################################
> ### PORTAS FORWARD
> for i in $PORTAS_FORWARD; do
>         $IPT -A FORWARD -p tcp --dport $i -j ACCEPT
> done
>
> ### FORWARD EXTERNA INTERNET
> for i in $IP_FORWARD_EXTERNO; do
>         $IPT -A FORWARD -d $i -j ACCEPT
> done
>
> ### FORWARD INTERNO INTERNT
> for i in $IP_FORWARD_INTERNO; do
>         $IPT -A FORWARD -s $i -j ACCEPT
> done
> ###
>
> for i in $PORTAS_UDP; do
>         $IPT -t filter -A FORWARD -p udp --dport $i -j ACCEPT
> done
>
> $IPT -t filter -A FORWARD -m state --state INVALID,RELATED,ESTABLISHED -j
> ACCEPT
> $IPT -t filter -A FORWARD -j LOG $LOG_OPTIONS --log-prefix "LOG_FORWARD"
> $IPT -t filter -A FORWARD -j DROP
>
> echo "FIREWALL INICIADO ....................[OK]"
>
> Gostaria da ajuda para saber o comando e onde colocar.
>
> _______________________________________________
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>
>
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