S TP e inspeção de conexões ESMTP com exemplo de configuração do Cisco IOS Firewall

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Atualizado:3 de Março de 2006

ID do documento:69309

Sobre a tradução

Sobre esta tradução

A Cisco traduziu este documento com a ajuda de tecnologias de tradução automática e humana para oferecer conteúdo de suporte aos seus usuários no seu próprio idioma, independentemente da localização. Observe que mesmo a melhor tradução automática não será tão precisa quanto as realizadas por um tradutor profissional. A Cisco Systems, Inc. não se responsabiliza pela precisão destas traduções e recomenda que o documento original em inglês (link fornecido) seja sempre consultado.

Índice

Introdução

Pré-requisitos

Requisitos

Componentes Utilizados

Convenções

Informações de Apoio

Configurar

Diagrama de Rede

Configurações

Verificar

Troubleshooting

Informações Relacionadas

Introdução

Este documento fornece uma configuração de exemplo para a inspeção de conexões de entrada do Simple Mail Transfer Protocol (SMTP) ou do Extended Simple Mail Transfer Protocol (ESMTP) utilizando o Cisco IOS® Firewall no Cisco IOS. Tal inspeção é similar à característica MailGuard encontrada nos Cisco PIX 500 Series Security Appliances.

Pré-requisitos

Requisitos

Não existem requisitos específicos para este documento.

Componentes Utilizados

As informações neste documento são baseadas nestas versões de software e hardware:

Cisco IOS Software Release 12.3(4)T ou Mais Recente
Cisco 3640 Router

As informações neste documento foram criadas a partir de dispositivos em um ambiente de laboratório específico. Todos os dispositivos utilizados neste documento foram iniciados com uma configuração (padrão) inicial. Se a sua rede estiver ativa, certifique-se de que entende o impacto potencial de qualquer comando.

Convenções

Consulte as Convenções de Dicas Técnicas da Cisco para obter mais informações sobre convenções de documentos.

Informações de Apoio

A inspeção de SMTP causa comandos S TP ser inspecionado para comandos ilegais. Os pacotes com comandos ilegais são alterados a um teste padrão de “xxxx” e enviados ao server. Este processo faz com que o server envie uma resposta negativa, que force o cliente a emitir um comando válido. Um comando ilegal S TP é comando any à exceção destes comandos:

DADOS
HELO
AJUDA
CORREIO
NOOP
SAIR

RCPT
RSET
SAML
ENVIE
SOML
VRFY

A inspeção de ESMTP opera-se da mesma forma que a inspeção de SMTP faz. Os pacotes com comandos ilegais são alterados a um teste padrão “xxxx” e enviados ao server, que provoca uma resposta negativa. Um comando ilegal ESMTP é comando any à exceção destes comandos:

AUTH
DADOS
EHLO
ETRN
HELO
AJUDA
AJUDA
CORREIO

NOOP
SAIR
RCPT
RSET
SAML
ENVIE
SOML
VRFY

A inspeção de ESMTP igualmente examina estes Ramais através de uma inspeção mais profunda do comando:

Declaração do tamanho de mensagem (TAMANHO)
Fila remota que processa a declaração (ETRN)
O binário MIMICA (BINARYMIME)
Encanamento do comando
Autenticação
Notificação de Status de entrega (DSN)
Código de status aumentado (ENHANCEDSTATUSCODE)
MIMEtransport de 8 bits (8BITMIME)

Nota: O S TP e a inspeção de ESMTP não podem ser configurados simultaneamente. Uma tentativa de configurar ambos os resultados em um Mensagem de Erro.

Nota: No Cisco IOS Software Release 12.3(4)T e Mais Recente, o Cisco IOS Firewall já não cria entradas de lista de acesso dinâmico para permitir o tráfego. O Cisco IOS Firewall mantém agora uma tabela do estado de sessão para controlar a segurança de conexões inspecionadas.

Configurar

Nesta seção, você encontrará informações para configurar os recursos descritos neste documento.

Nota: Use a Command Lookup Tool (somente clientes registrados) para obter mais informações sobre os comandos usados nesta seção.

Diagrama de Rede

Este documento utiliza a seguinte configuração de rede:

Configurações

Este documento utiliza esta configuração:

3640 Router
3640-123#show running-config Building configuration... Current configuration : 1432 bytes ! version 12.3 service config service timestamps debug datetime msec service timestamps log datetime msec service password-encryption ! hostname 3640-123 ! boot-start-marker boot-end-marker ! enable password 7 02050D4808095E731F ! no aaa new-model ! resource policy ! voice-card 3 ! ip subnet-zero ! ! ip cef no ip dhcp use vrf connected ! ! !--- This is the Cisco IOS Firewall configuration. !--- IN-OUT is the inspection rule for traffic that flows !--- from the inside interface of the router to the outside interface. ip inspect name IN-OUT tcp ip inspect name IN-OUT udp ip inspect name IN-OUT ftp ip inspect name IN-OUT http ip inspect name IN-OUT icmp !--- OUT-IN is the inspection rule for traffic that flows !--- from the outside interface of the router to the inside interface. !--- This rule is where SMTP/ESMTP inspection is specified. ip inspect name OUT-IN smtp ! no ip ips deny-action ips-interface ! no ftp-server write-enable ! ! ! ! controller T1 3/0 framing sf linecode ami ! ! ! ! ! !--- The outside interface. interface Ethernet2/0 ip address 172.22.1.16 255.255.255.0 !--- Apply the access list to permit SMTP/ESMTP connections !--- to the mail server. This also allows Cisco IOS Firewall !--- to inspect SMTP or ESMTP commands. ip access-group 101 in ip nat outside !--- Apply the inspection rule OUT-IN inbound on this interface. This is !--- the rule that defines SMTP/ESMTP inspection. ip inspect OUT-IN in ip virtual-reassembly half-duplex ! interface Serial2/0 no ip address shutdown ! !--- The inside interface. interface Ethernet2/1 ip address 10.10.10.1 255.255.255.0 ip nat inside !--- Apply the inspection rule IN-OUT inbound on this interface. ip inspect IN-OUT in ip virtual-reassembly half-duplex ! ip http server no ip http secure-server ip classless ip route 0.0.0.0 0.0.0.0 172.22.1.1 ! ! !--- The static translation for the mail server. ip nat inside source static 10.10.10.2 172.22.1.110 ip nat inside source static 10.10.10.5 172.22.1.111 ! !--- The access list to permit SMTP and ESMTP to the mail server. !--- Cisco IOS Firewall inspects permitted traffic. access-list 101 permit tcp any host 172.22.1.110 eq smtp ! ! ! control-plane ! ! ! voice-port 1/0/0 ! voice-port 1/0/1 ! voice-port 1/1/0 ! voice-port 1/1/1 ! ! ! ! ! ! ! ! line con 0 line aux 0 line vty 0 4 password 7 121A0C0411045D5679 login ! ! end

3640 Router

3640-123#show running-config
Building configuration...

Current configuration : 1432 bytes
!
version 12.3
service config
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname 3640-123
!
boot-start-marker
boot-end-marker
!
enable password 7 02050D4808095E731F
!
no aaa new-model
!
resource policy
!
voice-card 3
!
ip subnet-zero
!
!
ip cef
no ip dhcp use vrf connected
!
!

!--- This is the Cisco IOS Firewall configuration.


!--- IN-OUT is the inspection rule for traffic that flows !--- from the inside interface of the router to the outside interface.

ip inspect name IN-OUT tcp
ip inspect name IN-OUT udp
ip inspect name IN-OUT ftp
ip inspect name IN-OUT http
ip inspect name IN-OUT icmp


!--- OUT-IN is the inspection rule for traffic that flows !--- from the outside interface of the router to the inside interface. !--- This rule is where SMTP/ESMTP inspection is specified.

ip inspect name OUT-IN smtp
!
no ip ips deny-action ips-interface
!
no ftp-server write-enable
!
!
!
!
controller T1 3/0
 framing sf
 linecode ami
!
!
!
!
!

!--- The outside interface.

interface Ethernet2/0
 ip address 172.22.1.16 255.255.255.0


!--- Apply the access list to permit SMTP/ESMTP connections !--- to the mail server. This also allows Cisco IOS Firewall !--- to inspect SMTP or ESMTP commands.

 ip access-group 101 in
 ip nat outside


!--- Apply the inspection rule OUT-IN inbound on this interface. This is !--- the rule that defines SMTP/ESMTP inspection.

 ip inspect OUT-IN in
 ip virtual-reassembly
 half-duplex
!
interface Serial2/0
 no ip address
 shutdown
!

!--- The inside interface.

interface Ethernet2/1
 ip address 10.10.10.1 255.255.255.0
 ip nat inside


!--- Apply the inspection rule IN-OUT inbound on this interface.

 ip inspect IN-OUT in
 ip virtual-reassembly
 half-duplex
!
ip http server
no ip http secure-server
ip classless
ip route 0.0.0.0 0.0.0.0 172.22.1.1
!
!

!--- The static translation for the mail server.

ip nat inside source static 10.10.10.2 172.22.1.110
ip nat inside source static 10.10.10.5 172.22.1.111
!

!--- The access list to permit SMTP and ESMTP to the mail server. !--- Cisco IOS Firewall inspects permitted traffic.

access-list 101 permit tcp any host 172.22.1.110 eq smtp
!
!
!
control-plane
!
!
!
voice-port 1/0/0
!
voice-port 1/0/1
!
voice-port 1/1/0
!
voice-port 1/1/1
!
!
!
!
!
!
!
!
line con 0
line aux 0
line vty 0 4
 password 7 121A0C0411045D5679
 login
!
!
end

Verificar

Use esta seção para confirmar se a sua configuração funciona corretamente.

A Output Interpreter Tool (apenas para clientes registrados) (OIT) suporta determinados comandos show. Use a OIT para exibir uma análise da saída do comando show.

a mostra IP inspeciona tudo — Verifica a configuração de regras da inspeção do Cisco IOS Firewall e de seu aplicativo às relações.

3640-123#show ip inspect all
Session audit trail is disabled
Session alert is enabled
one-minute (sampling period) thresholds are [400:500] connections
max-incomplete sessions thresholds are [400:500]
max-incomplete tcp connections per host is 50. Block-time 0 minute.
tcp synwait-time is 30 sec -- tcp finwait-time is 5 sec
tcp idle-time is 3600 sec -- udp idle-time is 30 sec
dns-timeout is 5 sec
Inspection Rule Configuration
 Inspection name IN-OUT
    tcp alert is on audit-trail is off timeout 3600
    udp alert is on audit-trail is off timeout 30
    ftp alert is on audit-trail is off timeout 3600
    http alert is on audit-trail is off timeout 3600
    icmp alert is on audit-trail is off timeout 10
 Inspection name OUT-IN
    smtp max-data 20000000 alert is on audit-trail is off timeout 3600

Interface Configuration
 Interface Ethernet2/1
  Inbound inspection rule is IN-OUT
    tcp alert is on audit-trail is off timeout 3600
    udp alert is on audit-trail is off timeout 30
    ftp alert is on audit-trail is off timeout 3600
    http alert is on audit-trail is off timeout 3600
    icmp alert is on audit-trail is off timeout 10
  Outgoing inspection rule is not set
  Inbound access list is not set
  Outgoing access list is not set
 Interface Ethernet2/0
  Inbound inspection rule is OUT-IN
    smtp max-data 20000000 alert is on audit-trail is off timeout 3600
  Outgoing inspection rule is not set
  Inbound access list is 101
  Outgoing access list is not set

smtp do debug ip inspect — Indica mensagens sobre eventos da inspeção de SMTP do Cisco IOS Firewall.

Nota: Consulte Informações Importantes sobre Comandos de Depuração antes de usar comandos debug.

ausnml-3600-02#debug ip inspect smtp
INSPECT SMTP Inspection debugging is on
ausnml-3600-02#
*Oct 18 21:51:35.886: CBAC SMTP: reply_type OTHERS 
*Oct 18 21:51:35.886: CBAC SMTP: OTHER REPLY - Reply len: 64, match_len:64, reply_re_state:18
*Oct 18 21:51:35.886: CBAC SMTP: OTHER REPLY match id:13
*Oct 18 21:51:35.886: CBAC SMTP: OTHER REPLY match id:10
*Oct 18 21:51:35.886: CBAC SMTP: End Of Reply Line - index:0 ,len:64


!--- The client issues a command.

*Oct 18 21:51:40.810: CBAC SMTP: VERB - Cmd len:1, match_len:1, cmd_re_state:9
*Oct 18 21:51:40.994: CBAC SMTP: VERB - Cmd len:2, match_len:1, cmd_re_state:24
*Oct 18 21:51:41.190: CBAC SMTP: VERB - Cmd len:3, match_len:1, cmd_re_state:40
*Oct 18 21:51:41.390: CBAC SMTP: VERB - Cmd len:4, match_len:1, cmd_re_state:56
*Oct 18 21:51:41.390: CBAC SMTP: VERB - match id:5
*Oct 18 21:51:42.046: CBAC SMTP: CMD PARAM - Cmd len:5, match_len:1, cmd_re_state:7
*Oct 18 21:51:43.462: CBAC SMTP: CMD PARAM - Cmd len:6, match_len:1, cmd_re_state:2
*Oct 18 21:51:43.594: CBAC SMTP: CMD PARAM - Cmd len:7, match_len:1, cmd_re_state:2
*Oct 18 21:51:43.794: CBAC SMTP: CMD PARAM - Cmd len:9, match_len:2, cmd_re_state:2
*Oct 18 21:51:43.994: CBAC SMTP: CMD PARAM - Cmd len:10, match_len:1, cmd_re_state:2
*Oct 18 21:51:44.194: CBAC SMTP: CMD PARAM - Cmd len:12, match_len:2, cmd_re_state:3
*Oct 18 21:51:44.194: CBAC SMTP: CMD PARAM - match id:6
*Oct 18 21:51:44.194: CBAC SMTP: End Of Command Line - index:1, len:12


!--- The server replies.

*Oct 18 21:51:44.198: CBAC SMTP: reply_type OTHERS 
*Oct 18 21:51:44.198: CBAC SMTP: OTHER REPLY - Reply len: 11, match_len:11, reply_re_state:18
*Oct 18 21:51:44.198: CBAC SMTP: OTHER REPLY match id:13
*Oct 18 21:51:44.198: CBAC SMTP: OTHER REPLY match id:10
*Oct 18 21:51:44.198: CBAC SMTP: End Of Reply Line - index:1 ,len:11


!--- The client issues a command.

*Oct 18 21:51:49.482: CBAC SMTP: VERB - Cmd len:1, match_len:1, cmd_re_state:3
*Oct 18 21:51:50.222: CBAC SMTP: VERB - Cmd len:2, match_len:1, cmd_re_state:15
*Oct 18 21:51:50.618: CBAC SMTP: VERB - Cmd len:3, match_len:1, cmd_re_state:31
*Oct 18 21:51:50.954: CBAC SMTP: VERB - Cmd len:4, match_len:1, cmd_re_state:46
*Oct 18 21:51:50.954: CBAC SMTP: VERB - match id:15
*Oct 18 21:51:51.642: CBAC SMTP: CMD PARAM - Cmd len:5, match_len:1, cmd_re_state:7
*Oct 18 21:51:51.914: CBAC SMTP: CMD PARAM - Cmd len:6, match_len:1, cmd_re_state:2
*Oct 18 21:51:52.106: CBAC SMTP: CMD PARAM - Cmd len:7, match_len:1, cmd_re_state:2
*Oct 18 21:51:54.754: CBAC SMTP: CMD PARAM - Cmd len:8, match_len:1, cmd_re_state:4
*Oct 18 21:51:55.098: CBAC SMTP: CMD PARAM - Cmd len:9, match_len:1, cmd_re_state:2
*Oct 18 21:51:55.322: CBAC SMTP: CMD PARAM - Cmd len:11, match_len:2, cmd_re_state:3
*Oct 18 21:51:55.322: CBAC SMTP: CMD PARAM - match id:6
*Oct 18 21:51:55.322: CBAC SMTP: End Of Command Line - index:2, len:11


!--- The server replies.

*Oct 18 21:51:55.326: CBAC SMTP: reply_type OTHERS 
*Oct 18 21:51:55.326: CBAC SMTP: OTHER REPLY - Reply len: 19, match_len:19, reply_re_state:3
*Oct 18 21:51:55.326: CBAC SMTP: OTHER REPLY match id:13
*Oct 18 21:51:55.326: CBAC SMTP: End Of Reply Line - index:2 ,len:19

*Oct 18 21:51:57.070: CBAC SMTP: VERB - Cmd len:1, match_len:1, cmd_re_state:3
*Oct 18 21:51:57.402: CBAC SMTP: VERB - Cmd len:2, match_len:1, cmd_re_state:15
*Oct 18 21:51:58.162: CBAC SMTP: VERB - Cmd len:3, match_len:1, cmd_re_state:31
*Oct 18 21:51:58.462: CBAC SMTP: VERB - Cmd len:4, match_len:1, cmd_re_state:46
*Oct 18 21:51:58.466: CBAC SMTP: VERB - match id:15
*Oct 18 21:51:58.746: CBAC SMTP: CMD PARAM - Cmd len:5, match_len:1, cmd_re_state:7
*Oct 18 21:51:59.006: CBAC SMTP: CMD PARAM - Cmd len:6, match_len:1, cmd_re_state:2
*Oct 18 21:51:59.234: CBAC SMTP: CMD PARAM - Cmd len:7, match_len:1, cmd_re_state:2
*Oct 18 21:51:59.418: CBAC SMTP: CMD PARAM - Cmd len:9, match_len:2, cmd_re_state:2
*Oct 18 21:51:59.618: CBAC SMTP: CMD PARAM - Cmd len:10, match_len:1, cmd_re_state:2
*Oct 18 21:51:59.818: CBAC SMTP: CMD PARAM - Cmd len:12, match_len:2, cmd_re_state:3
*Oct 18 21:51:59.818: CBAC SMTP: CMD PARAM - match id:6
*Oct 18 21:51:59.818: CBAC SMTP: End Of Command Line - index:3, len:12

*Oct 18 21:51:59.818: CBAC SMTP: reply_type OTHERS 
*Oct 18 21:51:59.818: CBAC SMTP: OTHER REPLY - Reply len: 19, match_len:19, reply_re_state:3
*Oct 18 21:51:59.822: CBAC SMTP: OTHER REPLY match id:13
*Oct 18 21:51:59.822: CBAC SMTP: End Of Reply Line - index:3 ,len:19

*Oct 18 21:52:04.974: CBAC SMTP: VERB - Cmd len:1, match_len:1, cmd_re_state:9
*Oct 18 21:52:05.170: CBAC SMTP: VERB - Cmd len:2, match_len:1, cmd_re_state:24
*Oct 18 21:52:05.326: CBAC SMTP: VERB - Cmd len:3, match_len:1, cmd_re_state:40
*Oct 18 21:52:05.526: CBAC SMTP: VERB - Cmd len:4, match_len:1, cmd_re_state:55
*Oct 18 21:52:05.526: CBAC SMTP: VERB - match id:6
*Oct 18 21:52:05.742: CBAC SMTP: CMD PARAM - Cmd len:6, match_len:2, cmd_re_state:3
*Oct 18 21:52:05.742: CBAC SMTP: CMD PARAM - match id:6
*Oct 18 21:52:05.742: CBAC SMTP: End Of Command Line - index:4, len:6

*Oct 18 21:52:05.746: CBAC SMTP: reply_type OTHERS 
*Oct 18 21:52:05.746: CBAC SMTP: OTHER REPLY - Reply len: 54, match_len:54, reply_re_state:3
*Oct 18 21:52:05.746: CBAC SMTP: OTHER REPLY match id:13
*Oct 18 21:52:05.746: CBAC SMTP: End Of Reply Line - index:4 ,len:54

*Oct 18 21:52:05.746: CBAC SMTP: reply_type OTHERS 
*Oct 18 21:52:05.746: CBAC SMTP: OTHER REPLY - Reply len: 15, match_len:15, reply_re_state:3
*Oct 18 21:52:05.746: CBAC SMTP: OTHER REPLY match id:13
*Oct 18 21:52:05.746: CBAC SMTP: End Of Reply Line - index:5 ,len:15

*Oct 18 21:52:05.746: CBAC SMTP: reply_type OTHERS 
*Oct 18 21:52:05.746: CBAC SMTP: OTHER REPLY - Reply len: 15, match_len:15, reply_re_state:3
*Oct 18 21:52:05.746: CBAC SMTP: OTHER REPLY match id:13
*Oct 18 21:52:05.746: CBAC SMTP: End Of Reply Line - index:6 ,len:15

*Oct 18 21:52:05.746: CBAC SMTP: reply_type OTHERS 
*Oct 18 21:52:05.750: CBAC SMTP: OTHER REPLY - Reply len: 6, match_len:6, reply_re_state:3
*Oct 18 21:52:05.750: CBAC SMTP: OTHER REPLY match id:13
*Oct 18 21:52:05.750: CBAC SMTP: End Of Reply Line - index:7 ,len:6

*Oct 18 21:52:05.750: CBAC SMTP: reply_type OTHERS 
*Oct 18 21:52:05.750: CBAC SMTP: OTHER REPLY - Reply len: 19, match_len:19, reply_re_state:3
*Oct 18 21:52:05.750: CBAC SMTP: OTHER REPLY match id:13
*Oct 18 21:52:05.750: CBAC SMTP: End Of Reply Line - index:8 ,len:19

*Oct 18 21:52:05.750: CBAC SMTP: reply_type OTHERS 
*Oct 18 21:52:05.750: CBAC SMTP: OTHER REPLY - Reply len: 17, match_len:17, reply_re_state:3
*Oct 18 21:52:05.750: CBAC SMTP: OTHER REPLY match id:13
*Oct 18 21:52:05.750: CBAC SMTP: End Of Reply Line - index:9 ,len:17

*Oct 18 21:52:05.750: CBAC SMTP: reply_type OTHERS 
*Oct 18 21:52:05.750: CBAC SMTP: OTHER REPLY - Reply len: 6, match_len:6, reply_re_state:3
*Oct 18 21:52:05.750: CBAC SMTP: OTHER REPLY match id:13
*Oct 18 21:52:05.754: CBAC SMTP: End Of Reply Line - index:10 ,len:6

*Oct 18 21:52:05.754: CBAC SMTP: reply_type OTHERS 
*Oct 18 21:52:05.754: CBAC SMTP: OTHER REPLY - Reply len: 6, match_len:6, reply_re_state:3
*Oct 18 21:52:05.754: CBAC SMTP: OTHER REPLY match id:13
*Oct 18 21:52:05.754: CBAC SMTP: End Of Reply Line - index:11 ,len:6

*Oct 18 21:52:05.754: CBAC SMTP: reply_type OTHERS 
*Oct 18 21:52:05.754: CBAC SMTP: OTHER REPLY - Reply len: 6, match_len:6, reply_re_state:3
*Oct 18 21:52:05.754: CBAC SMTP: OTHER REPLY match id:13
*Oct 18 21:52:05.754: CBAC SMTP: End Of Reply Line - index:12 ,len:6

*Oct 18 21:52:05.754: CBAC SMTP: reply_type OTHERS 
*Oct 18 21:52:05.754: CBAC SMTP: OTHER REPLY - Reply len: 3, match_len:3, reply_re_state:3
*Oct 18 21:52:05.754: CBAC SMTP: OTHER REPLY match id:13
*Oct 18 21:52:05.754: CBAC SMTP: End Of Reply Line - index:13 ,len:3

*Oct 18 21:52:15.646: CBAC SMTP: VERB - Cmd len:1, match_len:1, cmd_re_state:6
*Oct 18 21:52:15.838: CBAC SMTP: VERB - Cmd len:3, match_len:2, cmd_re_state:37
*Oct 18 21:52:16.206: CBAC SMTP: VERB - Cmd len:4, match_len:1, cmd_re_state:52
*Oct 18 21:52:16.206: CBAC SMTP: VERB - match id:9
*Oct 18 21:52:18.954: CBAC SMTP: CMD PARAM - Cmd len:6, match_len:2, cmd_re_state:3
*Oct 18 21:52:18.958: CBAC SMTP: CMD PARAM - match id:6
*Oct 18 21:52:18.958: CBAC SMTP: End Of Command Line - index:5, len:6

*Oct 18 21:52:18.958: CBAC SMTP: reply_type OTHERS 
*Oct 18 21:52:18.958: CBAC SMTP: OTHER REPLY - Reply len: 21, match_len:21, reply_re_state:18
*Oct 18 21:52:18.958: CBAC SMTP: OTHER REPLY match id:13
*Oct 18 21:52:18.958: CBAC SMTP: OTHER REPLY match id:10
*Oct 18 21:52:18.958: CBAC SMTP: End Of Reply Line - index:14 ,len:21