Olá comunidade, eu estou com um problema, implementei um firewall com proxy ( squid ) no Fedora, a net está ok, o proxy também, só que não consigo receber e-mails e nem enviar, e as portas no firewall estão abertas para isso. esse é o meu firewall, se alguém puder me ajudar, eu agradeço... Vamos criar uma lista de pessoas que queiram conversar via Google Talk para tirar dúvidas? o meu é brunorodeiro@gmail.com abraços... #!/bin/bash
stop () { echo "0" > /proc/sys/net/ipv4/ip_forward iptables -F iptables -X }
start () {
############################# Limpar as regras primeiro /usr/sbin/iptables -F /usr/sbin/iptables -t nat -F /usr/sbin/iptables -F -t mangle /usr/sbin/iptables -X -t mangle
############################# Insere os modulos kernel /sbin/modprobe iptable_nat /sbin/modprobe iptable_mangle /sbin/modprobe ipt_conntrack /sbin/modprobe ip_conntrack_ftp /sbin/modprobe ip_nat_ftp /sbin/modprobe ipt_multiport /sbin/modprobe ipt_LOG /sbin/modprobe ipt_mark /sbin/modprobe ipt_MARK
echo 1 > /proc/sys/net/ipv4/ip_forward
echo "0" > /proc/sys/net/ipv4/tcp_ecn
########################################### #/usr/sbin/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE /usr/sbin/iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE
########### LOGS ###################### /usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 5190 -j LOG --log-prefix "LOG ICQ: " /usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 1863 -j LOG --log-prefix "LOG MSN: " /usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 22 -j LOG --log-prefix "Serviço SSH: " /usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 21 -j LOG --log-prefix "Serviço FTP: "
##################################### # PROTECAO EXTRA #####################################
############## Brute Force ############ /usr/sbin/iptables -A INPUT -p tcp --syn --dport 22 -m recent --name sshattack --set /usr/sbin/iptables -A INPUT -p tcp --dport 22 --syn -m recent --name sshattack --rcheck --seconds 60 --hitcount 3 -j LOG --log-prefix 'SSH REJECT: ' /usr/sbin/iptables -A INPUT -p tcp --dport 22 --syn -m recent --name sshattack --rcheck --seconds 60 --hitcount 3 -j REJECT --reject-with tcp-reset /usr/sbin/iptables -A FORWARD -p tcp --syn --dport 22 -m recent --name sshattack --set /usr/sbin/iptables -A FORWARD -p tcp --dport 22 --syn -m recent --name sshattack --rcheck --seconds 60 --hitcount 3 -j LOG --log-prefix 'SSH REJECT: ' /usr/sbin/iptables -A FORWARD -p tcp --dport 22 --syn -m recent --name sshattack --rcheck --seconds 60 --hitcount 3 -j REJECT --reject-with tcp-reset
############# Proteção contra trojans ################ /usr/sbin/iptables -N TROJAN /usr/sbin/iptables -A TROJAN -m limit --limit 15/m -j LOG --log-level 6 --log-prefix "FIREWALL: trojan: " /usr/sbin/iptables -A TROJAN -j DROP /usr/sbin/iptables -A INPUT -p TCP -i eth0 --dport 666 -j TROJAN /usr/sbin/iptables -A INPUT -p TCP -i eth0 --dport 666 -j TROJAN /usr/sbin/iptables -A INPUT -p TCP -i eth0 --dport 4000 -j TROJAN /usr/sbin/iptables -A INPUT -p TCP -i eth0 --dport 6000 -j TROJAN /usr/sbin/iptables -A INPUT -p TCP -i eth0 --dport 6006 -j TROJAN /usr/sbin/iptables -A INPUT -p TCP -i eth0 --dport 16660 -j TROJAN
############## Proteção contra worms ################# /usr/sbin/iptables -A FORWARD -p tcp --dport 135 -i eth0 -j REJECT
############## SYN-flood ############ /usr/sbin/iptables -A FORWARD -p tcp --syn -m limit --limit 1/s -j ACCEPT
############## ping da morte ######## /usr/sbin/iptables -A FORWARD -p icmp --icmp-type echo-request -m limit --limit 1/s -j ACCEPT
########### Port Scanners ########### /usr/sbin/iptables -A FORWARD -p tcp --tcp-flags SYN,ACK,FIN,RST RST -m limit --limit 1/s -j DROP
########## IP Spoofing ############## /usr/sbin/iptables -N syn-flood /usr/sbin/iptables -A INPUT -i eth0 -p tcp --syn -j syn-flood /usr/sbin/iptables -A INPUT -s 10.0.0.0/8 -i eth0 -j DROP /usr/sbin/iptables -A INPUT -s 172.16.0.0/16 -i eth0 -j DROP /usr/sbin/iptables -A INPUT -s 192.168.0.0/24 -i eth0 -j DROP
######## anomalias de pacotes ####### /usr/sbin/iptables -A FORWARD -m unclean -j DROP
################### CEF ######################## /usr/sbin/iptables -t nat -A PREROUTING -p tcp -d 200.201.174.0/16 -j ACCEPT /usr/sbin/iptables -A FORWARD -p tcp -d 200.201.174.0/16 -j ACCEPT /usr/sbin/iptables -t nat -A PREROUTING -p tcp -d 200.201.166.0/16 -j ACCEPT /usr/sbin/iptables -A FORWARD -p tcp -d 200.201.166.0/16 -j ACCEPT
############################# Redirecionar 80, 3128 -> 3128
#/usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 2100 -j DNAT --to-destination 192.168.0.1:3128 #/usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 80 -s 192.168.0.0/24 -j DNAT --to-destination 192.168.0.1:3128 iptables -t nat -A PREROUTING -i eth1 -p tcp -m multiport -s 192.168.0.0/24 --dport 80,443,563 -j REDIRECT --to-port 3128
############################# Aceitar lista de portas padrao /usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 21 -j ACCEPT /usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 22 -j ACCEPT /usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 23 -j ACCEPT -s 192.168.0.145 /usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 25 -j ACCEPT -s 192.168.0.0/24 /usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 53 -j ACCEPT /usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 80 -j ACCEPT -s 192.168.0.0/24 /usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 110 -j ACCEPT -s 192.168.0.0/24 /usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 443 -j ACCEPT /usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 465 -j ACCEPT /usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 500 -j ACCEPT /usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 587 -j ACCEPT /usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 995 -j ACCEPT /usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 3306 -j ACCEPT -s 192.168.0.0/24 /usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 2100 -j ACCEPT -s 192.168.0.0/24 /usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 8080 -j ACCEPT -s 192.168.0.0/24 /usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 5017 -j ACCEPT -s 192.168.0.0/24
########## ICQ ################ /usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 5190 -j ACCEPT -s 192.168.0.50
########### MSN ####################### /usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 1863 -j ACCEPT -s 192.168.0.128
###################################### # Filtros de portas udp ###################################### /usr/sbin/iptables -t nat -A PREROUTING -p udp --dport 53 -j ACCEPT /usr/sbin/iptables -t nat -A PREROUTING -p tcp --dport 53 -j ACCEPT
########### Apos feitas as regras rejeitar todos os outros pacotes /usr/sbin/iptables -t nat -p tcp -A PREROUTING -j DROP /usr/sbin/iptables -t nat -p udp -A PREROUTING -j DROP
}
case $1 in start) echo -n Starting Firewall... add_rules echo "Done" ;; stop) echo -n Stoping Firewall... flush_rules echo "Done" ;; restart) echo -n Restarting Firewall... flush_rules add_rules echo "Done" ;; status) echo "============================ Firewall rules:" iptables -L -n echo "============================ Masquerade tables:" iptables -t nat -L -n echo "============================ Mangle table:" iptables -t mangle -L -n ;; *) echo Usar: "$0 { status | start | stop | restart }" ;; esac
Seu servidor de email fica dentro da rede?
Em 27/11/06, Bruno Yahoobrunoce10@yahoo.com.br escreveu:
Olá comunidade, eu estou com um problema, implementei um firewall com proxy ( squid ) no Fedora, a net está ok, o proxy também, só que não consigo receber e-mails e nem enviar, e as portas no firewall estão abertas para isso. esse é o meu firewall, se alguém puder me ajudar, eu agradeço... Vamos criar uma lista de pessoas que queiram conversar via Google Talk para tirar dúvidas? o meu é brunorodeiro@gmail.com abraços... #!/bin/bash
stop () { echo "0" > /proc/sys/net/ipv4/ip_forward iptables -F iptables -X }
start () {
############################# Limpar as regras primeiro
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