Cisco ASA 5505 - Manual (Page 1285)

60-17
Cisco ASA 5500 Series Configuration Guide using the CLI
Chapter 60 Configuring the ASA CSC Module
Configuration Examples for the CSC SSM
• The second policy, csc_in_policy, is applied to the outside interface and uses the csc_in access list
to ensure that requests for SMTP and HTTP originating on the outside interface and destined for the
DMZ network are scanned by the CSC SSM. Scanning HTTP requests protects the web server from
HTTP file uploads.
hostname(config)# access-list csc_out permit tcp 192.168.10.0 255.255.255.0 any eq 21
hostname(config)# access-list csc_out deny tcp 192.168.10.0 255.255.255.0 192.168.20.0
255.255.255.0 eq 80
hostname(config)# access-list csc_out permit tcp 192.168.10.0 255.255.255.0 any eq 80
hostname(config)# access-list csc_out permit tcp 192.168.10.0 255.255.255.0 any eq 110
hostname(config)# class-map csc_outbound_class
hostname(config-cmap)# match access-list csc_out
hostname(config-cmap)# policy-map csc_out_policy
hostname(config-pmap)# class csc_outbound_class
hostname(config-pmap-c)# csc fail-close
hostname(config-pmap-c)# service-policy csc_out_policy interface inside
hostname(config)# access-list csc_in permit tcp any 192.168.20.0 255.255.255.0 eq 25
hostname(config)# access-list csc_in permit tcp any 192.168.20.0 255.255.255.0 eq 80
hostname(config)# class-map csc_inbound_class
hostname(config-cmap)# match access-list csc_in
hostname(config-cmap)# policy-map csc_in_policy
hostname(config-pmap)# class csc_inbound_class
hostname(config-pmap-c)# csc fail-close
hostname(config-pmap-c)# service-policy csc_in_policy interface outside
The following example shows how to use an access list to exempt the traffic from being matched by the
policy map and prevent the ASA from sending traffic to the CSC SSM:
hostname(config)# access-list csc_out permit tcp 192.168.10.0 255.255.255.0 any eq 21
hostname(config)# access-list csc_out deny tcp 192.168.10.0 255.255.255.0 192.168.20.0
255.255.255.0 eq 80
hostname(config)# access-list csc_out permit tcp 192.168.10.0 255.255.255.0 any eq 80
hostname(config)# access-list csc_out permit tcp 192.168.10.0 255.255.255.0 any eq 110
The following example shows how to add an ACE to the csc_out access list to exclude HTTP connections
between the trusted external web server and inside hosts from being scanned by the CSC SSM:
hostname(config)# access-list csc_out deny tcp 192.168.10.0 255.255.255.0 209.165.201.7
255.255.255.255 eq 80
The following example shows how to use the access list on the service policy applied to the outside
interface:
hostname(config)# access-list csc_in permit tcp any 192.168.20.0 255.255.255.0 eq 25
The following example shows how to add an ACE to the csc_in access list to use the CSC SSM to protect
the web server on a DMZ network from infected files uploaded by HTTP from external hosts:
hostname(config)# access-list csc_in permit tcp any 192.168.20.0 255.255.255.0 eq 80