Pessoal
Boa tarde !
Estou enfrentando um pequeno problema em minha estrutura.
Configurei o firewall e o proxy (squid3) na mesma máquina. Porem quando
tento receber e-mail pelo outlook ou mesmo pelo thunderbird nao funciona.
Detalhes:
- o firewall está todo accept nao está bloqueando nada.
- se tirar o proxy funciona
Irei postar meu squid.conf e o meu firewall tb, se alguem puder me dar
alguam dica.
Abraços a todos
# cat firewall
#!/bin/bash
echo "#################################################################"
echo "## Iniciando o IPTables... ##"
echo "#################################################################"
echo
#######################################################################
## Variáveis ##
#######################################################################
echo "Criando variaveis ...";
echo
vIth_net='eth0'; # interface de rede responsável por receber link Embratel
vIth_adm='eth1'; # interface de rede direcionada a rede interna
vIth_dmz='eth2'; # interface de rede direcionada a rede DMZ
vIptables='/sbin/iptables'; # caminho do executável do comando iptables
vModprobe='/sbin/modprobe'; # caminho do execitável do comamdo modprobe
vPortWorms=31337,33270,1234,6711,16660,60001,12345,12346,1524,27665,27444,31335,6000,6001,6002
# portas sujeitas ao ataque de trojan
vPortasAltas=1024:65535
vIp_net='200.243.63.139'; # IP configurado na interface eth0 - IP embratel
vIp_dmz='192.168.217.1'; # IP configurado na interface eth1 - recebe do
servidor dhcp - gateway da rede iterna
vIp_adm='192.168.217.33'; # IP configurado na interface eth1 - gateway da
rede DMZ
vLan_lfwl='192.168.217.0/27'; # sub-rede firewall
vLan_ldmz='192.168.217.32/27'; # sub-rede DMZ
vLan_lsti='192.168.217.64/27'; # sub-rede TI ( Segurança e Tecnologia da
Informação )
vLan_ladm='192.168.217.96/27'; # Sub-rede administração
vLan_lsup='192.168.217.128/27'; # sub-rede suporte
vLan_lpro='192.168.217.160/27'; # sub-rede produção
vLan_lcon='192.168.217.192/27'; # sub-rede convidada
vLan_lwir='192.168.217.224/27'; # sub-rede wireless
vIP_SMB='192.168.200.34' # IP ativo no Servidor de Arquivos
vIP_WEB='192.168.200.35' # IP ativo no Servidor WEB
vIP_APL='192.168.200.36' # IP ativo no Servidor de Aplicação
vIP_SDB='192.168.200.37' # IP ativo no Servidor de Banco de Dados
#######################################################################
## Limpa todas as regras ##
#######################################################################
echo "Limpando as regras ...";
echo
fClearRules()
{
$vIptables -F
$vIptables -X
$vIptables -t nat -F
$vIptables -F INPUT
$vIptables -F OUTPUT
$vIptables -F FORWARD
$vIptables -Z
$vIptables -t nat -F PREROUTING
$vIptables -t nat -F OUTPUT
$vIptables -t nat -F POSTROUTING
$vIptables -Z -t nat
}
fClearRules
#################################################################
## Habilita roteamento entre placas ##
#################################################################
echo "Habilita roteamento entre placas ...";
echo
fIpForward()
{
echo "1" > /proc/sys/net/ipv4/ip_forward
}
fIpForward
#######################################################################
## Carrega arrega os módulos ##
#######################################################################
echo "Carregando modulos..."
echo
fModprobe()
{
$vModprobe iptable_nat
$vModprobe ip_conntrack_ftp
$vModprobe ip_nat_ftp
$vModprobe ip_conntrack
$vModprobe ip_conntrack_irc
$vModprobe ip_nat_irc
$vModprobe ipt_state
$vModprobe ip_tables
$vModprobe ipt_REDIRECT
$vModprobe ipt_LOG
$vModprobe ipt_REJECT
$vModprobe ipt_MASQUERADE
$vModprobe ipt_limit
}
fModprobe
#######################################################################
## Cria Politica Padrão ##
#######################################################################
echo "Criando Politica Padrao ...";
echo
fDefaulPolicy ()
{
$vIptables -P INPUT ACCEPT
$vIptables -P FORWARD ACCEPT
$vIptables -P OUTPUT ACCEPT
$vIptables -A INPUT -i lo -j ACCEPT
}
fDefaultPolicy
#######################################################################
## SNAT - Altera endereço e porta de origem ##
#######################################################################
echo "Habilitando Internet ..."
echo
$vIptables -v -t nat -A POSTROUTING -s $vLan_lfwl -o $vIth_net -j SNAT --to
$vIp_net
$vIptables -v -t nat -A POSTROUTING -s $vLan_ldmz -o $vIth_net -j SNAT --to
$vIp_net
$vIptables -v -t nat -A POSTROUTING -s $vLan_lsti -o $vIth_net -j SNAT --to
$vIp_net
*$vIptables -v -t nat -A POSTROUTING -s $vLan_ladm -o $vIth_net -j SNAT --to
$vIp_net*
$vIptables -v -t nat -A POSTROUTING -s $vLan_lsup -o $vIth_net -j SNAT --to
$vIp_net
$vIptables -v -t nat -A POSTROUTING -s $vLan_lpro -o $vIth_net -j SNAT --to
$vIp_net
$vIptables -v -t nat -A POSTROUTING -s $vLan_lcon -o $vIth_net -j SNAT --to
$vIp_net
$vIptables -v -t nat -A POSTROUTING -s $vLan_lwir -o $vIth_net -j SNAT --to
$vIp_net
echo "Estabilizando conexões ...";
echo
$vIptables -v -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
$vIptables -v -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
#######################################################################
## Politicas ACCEPT ##
#######################################################################
echo "Politicas ACCEPT - lfwl - Firewall ..."
# Web 80/8080/8081
$vIptables -A FORWARD -p tcp -s $vLan_lfwl -d 0/0 --dport 80 -j ACCEPT
$vIptables -A FORWARD -p tcp -s $vLan_lfwl -d 0/0 --dport 8080 -j ACCEPT
$vIptables -A FORWARD -p tcp -s $vLan_lfwl -d 0/0 --dport 8081 -j ACCEPT
# DNS 53
$vIptables -A FORWARD -p tcp -s $vLan_lfwl -d 0/0 --dport 53 -j ACCEPT
$vIptables -A FORWARD -p udp -s $vLan_lfwl -d 0/0 --dport 53 -j ACCEPT
$vIptables -A INPUT -s $vLan_lsti -d $vLan_lfwl -j ACCEPT
echo "Politicas ACCEPT - ldmz - DMZ ..."
# Web 80/8080/8081
$vIptables -A FORWARD -p tcp -s $vLan_ldmz -d 0/0 --dport 80 -j ACCEPT
$vIptables -A FORWARD -p tcp -s $vLan_ldmz -d 0/0 --dport 8080 -j ACCEPT
$vIptables -A FORWARD -p tcp -s $vLan_ldmz -d 0/0 --dport 8081 -j ACCEPT
# DNS 53
$vIptables -A FORWARD -p tcp -s $vLan_ldmz -d 0/0 --dport 53 -j ACCEPT
$vIptables -A FORWARD -p udp -s $vLan_ldmz -d 0/0 --dport 53 -j ACCEPT
*
echo "Politicas ACCEPT - ladm - Administração ..."
# Web 80/8080/8081
$vIptables -v -A FORWARD -p tcp -s $vLan_ladm -d 0/0 --dport 80 -j ACCEPT
$vIptables -v -A FORWARD -p tcp -s $vLan_ladm -d 0/0 --dport 8080 -j ACCEPT
$vIptables -v -A FORWARD -p tcp -s $vLan_ladm -d 0/0 --dport 8081 -j ACCEPT
# WEB SSl 443
$vIptables -v -A FORWARD -p tcp -s $vLan_ladm -d 0/0 --dport 443 -j ACCEPT
# DNS 53
$vIptables -v -A FORWARD -p tcp -s $vLan_ladm -d 0/0 --dport 53 -j ACCEPT
$vIptables -v -A FORWARD -p udp -s $vLan_ladm -d 0/0 --dport 53 -j ACCEPT
# Email 25 110 587 993 995
$vIptables -v -A FORWARD -p tcp -s $vLan_ladm -d 0/0 --dport 25 -j ACCEPT
$vIptables -v -A FORWARD -p tcp -s $vLan_ladm -d 0/0 --dport 110 -j ACCEPT
$vIptables -v -A FORWARD -p tcp -s $vLan_ladm -d 0/0 --dport 587 -j ACCEPT
$vIptables -v -A FORWARD -p tcp -s $vLan_ladm -d 0/0 --dport 993 -j ACCEPT
$vIptables -v -A FORWARD -p tcp -s $vLan_ladm -d 0/0 --dport 995 -j ACCEPT
$vIptables -v -A FORWARD -p tcp --sport 25 -j ACCEPT
$vIptables -v -A FORWARD -p tcp --sport 110 -j ACCEPT
$vIptables -v -A FORWARD -p tcp --sport 587 -j ACCEPT
$vIptables -v -A FORWARD -p tcp --sport 993 -j ACCEPT
$vIptables -v -A FORWARD -p tcp --sport 995 -j ACCEPT*
# Servidor de arquivos SAMBA 137 138 139 445
$vIptables -v -A FORWARD -p tcp -s $vLan_ladm -d $vIP_SMB -m multiport
--dport 137,138,139,445 -j ACCEPT
**********************************************************************************************************************************************************************************************
# cat /etc/squid3/squid.conf
# Configuracao Squid3
# identificacao host_ip e porta
http_port 192.168.217.1:3128
# Nome atribuido ao proxy
visible_hostname firewall
icp_port 3130
hierarchy_stoplist cgi-bin ?
# Definindo o cache que será armazenado em memoria
cache_mem 1024 MB
# Define o tamanho max de um arquivo em memoria
maximum_object_size_in_memory 128 KB
# Define tamanho max do arquivo armazenado
maximum_object_size 512 MB
# Define tamanho min do arquivo em cache
minimum_object_size 0 KB
# Define o percentual em que o squid iniciara o descarte de arquivos
# mais antigos.
cache_swap_low 90
cache_swap_high 95
# Ajustando o cache em disco : Iremos especificar 512Mb de cache, com 128
#diretorios e 256 subdiretorios.
cache_dir ufs /var/spool/squid3 1024 128 256
# Atualizacao do cache
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern . 0 20% 4320
#O cache pode ser configurado para continuar com o download de requisições
abortadas
quick_abort_min 0 KB
quick_abort_max 0 KB
quick_abort_pct 100
# Inicio da politica de filtragem
acl all_network src 0.0.0.0/0.0.0.0
acl manager proto cache_object
acl to_localhost dst 127.0.0.0/8
acl SSl_ports port 443
acl Safe_ports port 80 # http
acl Safe_ports port 443 # https
acl Safe_ports port 70 # gopher
acl Safe_ports port 210 # wais
acl Safe_ports port 1025-65535 # unregistered ports
acl Safe_ports port 280 # http-mgmt
acl Safe_ports port 488 # gss-http
acl Safe_ports port 591 # filemaker
acl Safe_ports port 777 # multiling http
acl Safe_ports port 901 # swat
acl Safe_ports port 3389 # TsMicrosoft
acl Safe_ports port 993 # gmail
acl Safe_ports port 995 # gmail
acl Safe_ports port 587 # gmail
acl Safe_ports port 110 # smtp
acl Safe_ports port 25 # pop
acl Safe_ports port 137 # pop
acl Safe_ports port 138 # pop
acl purge method PURGE
acl CONNECT method CONNECT
# ---- Cache do Windows Update ----
#refresh_pattern au.download.windowsupdate.com/.*\.(cab|exe|msi) 10080 100%
43200 reload-into-ims
#refresh_pattern download.microsoft.com/.*\.(cab|exe|msi) 10080 100% 43200
reload-into-ims
#refresh_pattern msgruser.dlservice.microsoft.com/.*\.(cab|exe|msi) 10080
100% 43200 reload-into-ims
#refresh_pattern windowsupdate.com/.*\.(cab|exe|msi) 10080 100% 43200
reload-into-ims
#refresh_pattern www.microsoft.com/.*\.(cab|exe|msi) 10080 100% 43200
reload-into-ims
http_access allow Safe_ports
http_access allow manager to_localhost
http_access deny manager
http_access allow purge to_localhost
http_access deny purge
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
# Definindo as redes que seram liberada para acesso ao proxy
acl acl_ldmz src "/etc/squid3/acl/lan_dmz.acl"
acl acl_lsti src "/etc/squid3/acl/lan_sti.acl"
acl acl_ladm src "/etc/squid3/acl/lan_adm.acl"
acl acl_lsup src "/etc/squid3/acl/lan_sup.acl"
acl acl_lpro src "/etc/squid3/acl/lan_pro.acl"
acl acl_lcon src "/etc/squid3/acl/lan_con.acl"
acl acl_lwir src "/etc/squid3/acl/lan_wir.acl"
# Definindo acl de filtragem para urls
acl url_bloqueadas dstdomain "/etc/squid3/acl/url_bloqueadas.acl"
acl url_liberadas dstdomain "/etc/squid3/acl/url_liberadas.acl"
acl url_trabalho dstdomain "/etc/squid3/acl/url_trabalho.acl"
# Definindo bloqueio de palavras
acl palavras_bloqueadas dstdom_regex -i
"/etc/squid3/acl/palavras_bloqueadas.acl"
acl extensoes_bloqueadas url_regex -i
"/etc/squid3/acl/extensoes_bloqueadas.acl"
# Definindo horario de acesso
acl almoco time 12:05-13:25
acl url_libera_almoco dstdomain "/etc/squid3/acl/url_horario.acl"
http_access allow almoco url_libera_almoco
http_access allow url_trabalho !url_bloqueadas
http_access allow url_liberadas !url_bloqueadas
http_access deny palavras_bloqueadas
http_access deny url_bloqueadas
http_access deny extensoes_bloqueadas
http_access allow !palavras_bloqueadas !url_bloqueadas
http_access allow acl_ldmz
http_access allow acl_lsti
http_access allow acl_ladm
http_access allow acl_lsup
http_access allow acl_lpro
http_access allow acl_lcon
http_access allow acl_lwir
# Parâmetros para controle de banda
# IPs cadastrados para download 70k
acl ip_download_70 src "/etc/squid3/acl/ip_download_70.acl"
delay_pools 2
delay_class 1 2
delay_access 1 allow ip_download_70
delay_class 2 2
delay_access 2 allow acl_lsti
delay_parameters 1 -1/-1 70000/70000
delay_parameters 2 -1/-1 32000/32000
#bloqueia acesso para demais redes
#http_access deny all_network
coredump_dir /var/spool/squid3
# Direcionando para página de saida
# E-mail do administrador
cache_mgr [email protected]
# Definindo localizacao de armazenamento dos LOGs de acesso
cache_access_log /var/log/squid3/access.log
error_directory /usr/share/squid3/errors/Portuguese
--
--------------------------------------------------
°v° Flávio Alexandre dos Reis
/( )\ [email protected]
^ ^ LPIC-1
Linux user #481115
Ubuntu user #24388
Juiz de Fora - MG
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