[Ubuntu-BR] Firewall Ubuntu 10.04
Wilson Bom
wilson_bom em yahoo.com.br
Quinta Março 22 12:54:01 UTC 2012
Bom dia Pessoal,
achei um site ( grc.com ) que testa as portas:
www.grc.com
ShieldsUP
ShieldsUP
Proceed
Common Ports
O resultado foi este:
GRC Port Authority Report created on UTC: 2012-03-22 at 12:50:48
Results from scan of ports: 0, 21-23, 25, 79, 80, 110, 113,
119, 135, 139, 143, 389, 443, 445,
1002, 1024-1030, 1720, 5000
1 Ports Open
0 Ports Closed
25 Ports Stealth
---------------------
26 Ports Tested
NO PORTS were found to be CLOSED.
The port found to be OPEN was: 22
Other than what is listed above, all ports are STEALTH.
TruStealth: FAILED - NOT all tested ports were STEALTH,
- NO unsolicited packets were received,
- NO Ping reply (ICMP Echo) was received.
Este servidor esta de cara com a internet. Você acham que ele esta seguro ?
Obrigado
Wilson Bom
Em 20-03-2012 10:58, Wilson Bom escreveu:
> Bom dia Jeferson,
>
> sim, ja fiz um teste colocando em /etc/init.d
>
> Me parece que esta funcionando legal, mas não sei fazer testes de
> ataques para verificar a funcionalidade.
>
> []s
>
>> Bom dia Wilson,
>>
>> Você vai colocar no /etc/init.d/ o script?
>>
>> Abraços
>>
>> Em 20 de março de 2012 11:18, Wilson Bom<wilson_bom em yahoo.com.br>
>> escreveu:
>>
>>> Bom dia Pessoal,
>>>
>>> Estou tentando instalar firewall e gostaria da opinião dos senhores a
>>> respeito do script abaixo.
>>>
>>> ------------------------------**--------
>>>
>>>
>>> #! /bin/bash
>>>
>>> case "$1" in
>>> start)
>>>
>>> ###############
>>> # TITULO ABRE #
>>> ###############
>>> echo "Iniciando a Configuração do Firewall"
>>>
>>> ########################
>>> # Zera todas as Regras #
>>> ########################
>>> echo "Regras Zeradas"
>>> iptables -F
>>>
>>> ##############################**##########
>>> # Bloqueia tudo, nada entra e nada sai #
>>> ##############################**##########
>>> echo "Fechando tudo"
>>> iptables -P INPUT DROP
>>> iptables -P FORWARD DROP
>>> iptables -P OUTPUT DROP
>>>
>>> ##############################**##############################**
>>> ################
>>> # Impede ataques DoS a maquina limitando a quantidade de
>>> respostas do
>>> ping #
>>> ##############################**##############################**
>>> ################
>>> #echo "Previne ataques DoS"
>>> # iptables -A INPUT -p icmp --icmp-type echo-request -m limit
>>> --limit
>>> 1/s -j ACCEPT
>>>
>>> ##############################**###
>>> # Bloqieia completamente o ping #
>>> ##############################**###
>>> echo "Bloqueia o pings"
>>> iptables -A INPUT -p icmp --icmp-type echo-request -j DROP
>>>
>>> ##########################
>>> # Politicas de segurança #
>>> ##########################
>>> echo "Implementação de politicas de segurança"
>>> echo 0> /proc/sys/net/ipv4/conf/all/**accept_source_route #
>>> Impede
>>> falsear pacote
>>> echo 0> /proc/sys/net/ipv4/conf/all/**accept_redirects #
>>> Perigo de
>>> descobrimento de rotas de roteamento (desativar em roteador)
>>> echo 1> /proc/sys/net/ipv4/icmp_echo_**ignore_broadcasts #
>>> Risco de
>>> DoS
>>> echo 1> /proc/sys/net/ipv4/tcp_**syncookies # Só inicia a
>>> conexão
>>> quando recebe a confirmação, diminuindo a banda gasta
>>> echo 1> /proc/sys/net/ipv4/conf/**default/rp_filter # Faz o
>>> firewall responder apenas a placa de rede que recebeu o pacote
>>> iptables -A INPUT -m state --state INVALID -j DROP # Elimina os
>>> pacotes invalidos
>>>
>>> ##############################**###
>>> # Libera conexoes estabelecidas #
>>> ##############################**###
>>> echo "Liberando conexões estabelecidas"
>>> iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
>>> iptables -A FORWARD -m state --state RELATED,ESTABLISHED,NEW
>>> -j ACCEPT
>>> iptables -A OUTPUT -m state --state RELATED,ESTABLISHED,NEW -j
>>> ACCEPT
>>> iptables -A INPUT -i lo -j ACCEPT
>>>
>>> ##############################**##############################**
>>> ###########################
>>> # Libera o acesso via SSH e Limita o número de tentativas de
>>> acesso a 4
>>> a cada minuto #
>>> ##############################**##############################**
>>> ###########################
>>> echo "Liberando o SSH"
>>> iptables -I INPUT -p tcp --dport 22 -i eth0 -m state --state
>>> NEW -m
>>> recent --update --seconds 60 --hitcount 4 -j DROP
>>> iptables -A INPUT -p tcp --dport 22 -j ACCEPT
>>> iptables -A INPUT -p udp --dport 22 -j ACCEPT
>>>
>>> ##################
>>> # Libera o Samba #
>>> ##################
>>> echo "Liberando o Samba"
>>> iptables -A INPUT -p tcp --dport 137:139 -j ACCEPT
>>> iptables -A INPUT -p udp --dport 137:139 -j ACCEPT
>>>
>>> ###################
>>> # Libera o Apache #
>>> ###################
>>> echo "Liberando o Apache"
>>> iptables -A INPUT -p tcp --dport 80 -j ACCEPT
>>>
>>> ################
>>> # TITULO FECHA #
>>> ################
>>> echo "Configuração do Firewall Concluida."
>>>
>>> ;;
>>>
>>> stop)
>>> echo "Finalizando o Firewall"
>>> rm -rf /var/lock/subsys/firewall
>>>
>>> # ------------------------------**------------------------------**
>>> -----
>>> # Remove todas as regras existentes
>>> # ------------------------------**------------------------------**
>>> -----
>>> iptables -F
>>> iptables -X
>>> iptables -t mangle -F
>>> # ------------------------------**------------------------------**
>>> -----
>>> # Reseta as politicas padrões, aceitar tudo
>>> # ------------------------------**------------------------------**
>>> -----
>>> iptables -P INPUT ACCEPT
>>> iptables -P OUTPUT ACCEPT
>>> iptables -P FORWARD ACCEPT
>>>
>>> ;;
>>>
>>> restart|reload)
>>> $0 stop
>>> $0 start
>>> ;;
>>>
>>> *)
>>> echo "Selecione uma opção valida
>>> {start|stop|status|restart|**reload}"
>>> exit 1
>>>
>>> esac
>>>
>>> exit 0
>>>
>>>
>>> --
>>>
>>> Wilson Bom
>>>
>>>
>>> Serprodata Informática Ltda.
>>> Av. Marcelino Pires, 1405 - Sala 216
>>> 79800-004 - Dourados - MS
>>> (067) 3421-3343 - 8407-4808 - 8407-8808
>>>
>>> Messenger: serprodata em hotmail.com
>>>
>>> E-mail...: serprodata em hotmail.com
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>>> wilson.bom em gmail.com
>>>
>>>
>>>
>>> Ubuntu Lucid Lynx 10.04 - 2.6.32-25 #44
>>> Linux Counter: 292553
>>> Dataflex 3.2 Linux - Dataflex 3.2 MS-Dos
>>>
>>>
>>>
>>>
>>>
>>> --
>>> Mais sobre o Ubuntu em português:
>>> http://www.ubuntu-br.org/**comece<http://www.ubuntu-br.org/comece>
>>>
>>> Lista de discussão Ubuntu Brasil
>>> Histórico, descadastramento e outras opções:
>>> https://lists.ubuntu.com/**mailman/listinfo/ubuntu-br<https://lists.ubuntu.com/mailman/listinfo/ubuntu-br>
>>>
>>>
>
>
--
Wilson Bom
Serprodata Informática Ltda.
Av. Marcelino Pires, 1405 - Sala 216
79800-004 - Dourados - MS
(067) 3421-3343 - 8407-4808 - 8407-8808
Messenger: serprodata em hotmail.com
E-mail...: serprodata em hotmail.com
wilson_bom em hotmail.com
wilson_bom em yahoo.com.br
wilson.bom em gmail.com
Ubuntu Lucid Lynx 10.04 - 2.6.32-25 #44
Linux Counter: 292553
Dataflex 3.2 Linux - Dataflex 3.2 MS-Dos
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