Problemas com IPFW (Basico)

[Valois]

Pessoal,

Sou novo em firewall e estou tendo problemas em abrir determinadas portas depois que carrego o firewall.

Depois que carrego o script abaixo, não consigo mais pingar para o micro e para fora do micro nem usar os serviços de ssh, pop, www, etc

Alguém pode me ajudar? estou usando o freebsd 4.10

Segue um exemplo do script:

# set these to your outside interface network and netmask and ip
oif="vr0:"
onet="192.168.0.0"
omask="255.255.255.0"
oip="192.168.0.230"

# set these to your inside interface network and netmask and ip
iif="fxp0:"
inet="192.168.1.0"
imask="255.255.255.0"
iip="192.168.1.1"

setup_loopback

# Stop spoofing
${fwcmd} add deny all from ${inet}:${imask} to any in via ${oif}
${fwcmd} add deny all from ${onet}:${omask} to any in via ${iif}

# Stop RFC1918 nets on the outside interface
${fwcmd} add deny all from any to 10.0.0.0/8 via ${oif}
${fwcmd} add deny all from any to 172.16.0.0/12 via ${oif}
${fwcmd} add deny all from any to 192.168.0.0/16 via ${oif}

# Stop draft-manning-dsua-03.txt (1 May 2000) nets (includes RESERVED-1,
# DHCP auto-configuration, NET-TEST, MULTICAST (class D), and class E)
# on the outside interface
${fwcmd} add deny all from any to 0.0.0.0/8 via ${oif}
${fwcmd} add deny all from any to 169.254.0.0/16 via ${oif}
${fwcmd} add deny all from any to 192.0.2.0/24 via ${oif}
${fwcmd} add deny all from any to 224.0.0.0/4 via ${oif}
${fwcmd} add deny all from any to 240.0.0.0/4 via ${oif}

# Network Address Translation. This rule is placed here deliberately
# so that it does not interfere with the surrounding address-checking
# rules. If for example one of your internal LAN machines had its IP
# address set to 192.0.2.1 then an incoming packet for it after being
# translated by natd(8) would match the `deny' rule above. Similarly
# an outgoing packet originated from it before being translated would
# match the `deny' rule below.
case ${natd_enable} in
[Yy][Ee][Ss])
if [ -n "${natd_interface}" ]; then
${fwcmd} add divert natd all from any to any via ${natd_
interface}
fi
;;
esac

# Stop RFC1918 nets on the outside interface
${fwcmd} add deny all from 10.0.0.0/8 to any via ${oif}
${fwcmd} add deny all from 172.16.0.0/12 to any via ${oif}
${fwcmd} add deny all from 192.168.0.0/16 to any via ${oif}

# Stop draft-manning-dsua-03.txt (1 May 2000) nets (includes RESERVED-1,
# DHCP auto-configuration, NET-TEST, MULTICAST (class D), and class E)
# on the outside interface
${fwcmd} add deny all from 0.0.0.0/8 to any via ${oif}
${fwcmd} add deny all from 169.254.0.0/16 to any via ${oif}
${fwcmd} add deny all from 192.0.2.0/24 to any via ${oif}
${fwcmd} add deny all from 224.0.0.0/4 to any via ${oif}
${fwcmd} add deny all from 240.0.0.0/4 to any via ${oif}

# Allow TCP through if setup succeeded
${fwcmd} add pass tcp from any to any established

#Checa o estado da conexao
${fwcmd} add check-state
${fwcmd} add allow tcp from ${inet}:${imask} to any setup

${fwcmd} add allow udp from ${inet}:${imask} to any

#Permite requisicoes DNS pelo localhost
${fwcmd} add allow tcp rfom 127.0.0.1 to any 53
${fwcmd} add allow tcp from any to 127.0.0.1 53

# Allow IP fragments to pass through
${fwcmd} add pass all from any to any frag

#Permite qualquer tr\xe1fego para ou de minha rede
${fwcmd} add allow all from ${iip} to ${inet}:${imask}
${fwcmd} add allow all from ${iip} to ${onet}:${omask}
${fwcmd} add allow all from ${inet}:${imask} to ${oip}
${fwcmd} add allow all from ${inet}:${imask} to ${iip}
${fwcmd} add allow all from ${inet}:${imask} to any

#Permite passar SSH internet e rede local
${fwcmd} add pass tcp from any to 192.168.0.250 22 setup
${fwcmd} add pass tcp from any to 192.168.0.250 22
${fwcmd} add pass tcp from any to ${oip} 22 setup
${fwcmd} add pass tcp from any to ${iip} 22 setup
${fwcmd} add pass tcp from ${oip} to any 22
${fwcmd} add pass tcp from ${iip} to any 22

#Allow ICMP through
${fwcmd} add pass icmp from 192.168.0.0/24 to ${iip}
${fwcmd} add pass icmp from 192.168.0.0/24 to ${oip}
${fwcmd} add pass icmp from ${inet}:${imask} to ${iip}
${fwcmd} add pass icmp from ${inet}:${imask} to ${oip}
${fwcmd} add pass icmp from ${inet}:${imask} to any via ${iip}
${fwcmd} add pass icmp from ${inet}:${imask} to any via ${oip}



${fwcmd} add pass icmp from any to ${oip} via ${oif} icmptypes 0,3,4,8,11,12
${fwcmd} add pass icmp from any to ${oip} via ${iif} icmptypes 0,3,4,8,11,12
${fwcmd} add pass icmp from any to ${iip} via ${oif} icmptypes 0,3,4,8,11,12
${fwcmd} add pass icmp from any to ${iip} via ${iif} icmptypes 0,3,4,8,11,12

# Allow setup of incoming email
${fwcmd} add pass tcp from any to ${oip} 25 setup
${fwcmd} add pass tcp from any to ${iip} 25 setup
${fwcmd} add pass udp from any to ${oip} 25
${fwcmd} add pass udp from any to ${iip} 25
#Permite o checagem de POP3
${fwcmd} add pass tcp from any to ${oip} 110 setup
${fwcmd} add pass tcp from any to ${iip} 110 setup


# Allow access to our DNS
${fwcmd} add pass tcp from any to any 53
${fwcmd} add pass udp from any to any 53
${fwcmd} add pass tcp from any to ${oip} 53 setup
${fwcmd} add pass udp from any to ${oip} 53
${fwcmd} add pass udp from ${oip} 53 to any

${fwcmd} add pass tcp from any to ${iip} 53 setup
${fwcmd} add pass udp from any to ${iip} 53
${fwcmd} add pass udp from ${iip} 53 to any

# Allow access to our WWW via fdx0
${fwcmd} add pass tcp from any to ${oip} 80 setup
${fwcmd} add pass udp from any to ${oip} 80
${fwcmd} add pass tcp from any to ${iip} 80 setup
${fwcmd} add pass tcp from any to ${iip} 80


# Reject&Log all setup of incoming connections from the outside
${fwcmd} add deny log tcp from any to any in via ${oif} setup

# Allow setup of any other TCP connection
${fwcmd} add pass tcp from any to any setup

# Allow DNS queries out in the world
${fwcmd} add pass udp from ${oip} to any 53 keep-state

# Allow NTP queries out in the world
${fwcmd} add pass udp from ${oip} to any 123 keep-state

# Everything else is denied by default, unless the
# IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel
# config file.
;;

[irado]

essas configurações de placa (vr0, fx0) correspondem às suas placas mesmo? Se não corresponderem, nada funciona.

um basicão bem basicão:

IGNORE (em termos) tudo o que está ANTES do check-state, concentre-se no que está depois..

esse é um fwll fechado por natureza, então vc deve ter qualquer coisa assim como:

add allow from any to any port xx setup keep-state

para cada um dos serviços que vc quer que trafeguem

${fwcmd} add allow all from ${iip} to ${inet}:${imask}

aqui há um preciosismo meio exagerado, uma vez que define que o que vier da rede interna pode seguir para ip/mascara..

melhor revisar suas regras.. essas aí são complexas demais pra nós, principiantes, o que não quer dizer que sejam melhores. Procure na lista do fugsp-br (http://www4.fugspbr.org/lista/cgi-bi...mal&sort=score)

e procure entender o que é que a galera tá falando lá
:twisted:

divirta-se