1-16
Cisco ASA Series CLI Configuration Guide
Chapter 1 Configuring Inspection of Basic Internet Protocols
HTTP Inspection
The latter two features are configured in conjunction with the
filter
command. For more information
about filtering, see
Chapter 1, “Configuring Filtering Services.”
The enhanced HTTP inspection feature, which is also known as an application firewall and is available
when you configure an HTTP map (see
“Configuring an HTTP Inspection Policy Map for Additional
), can help prevent attackers from using HTTP messages for circumventing network
security policy. It verifies the following for all HTTP messages:
•
Conformance to RFC 2616
•
Use of RFC-defined methods only.
•
Compliance with the additional criteria.
Configuring an HTTP Inspection Policy Map for Additional Inspection
Control
To specify actions when a message violates a parameter, create an HTTP inspection policy map. You can
then apply the inspection policy map when you enable HTTP inspection.
Note
When you enable HTTP inspection with an inspection policy map, strict HTTP inspection with the action
reset and log is enabled by default. You can change the actions performed in response to inspection
failure, but you cannot disable strict inspection as long as the inspection policy map remains enabled.
To create an HTTP inspection policy map, perform the following steps:
Step 1
(Optional) Add one or more regular expressions for use in traffic matching commands according to the
“Creating a Regular Expression” section on page 1-14
. See the types of text you can match in the
match
.
Step 2
(Optional) Create one or more regular expression class maps to group regular expressions according to
the
“Creating a Regular Expression Class Map” section on page 1-17
Step 3
(Optional) Create an HTTP inspection class map by performing the following steps.
A class map groups multiple traffic matches. Traffic must match
all
of the
match
commands to match
the class map. You can alternatively identify
match
commands directly in the policy map. The difference
between creating a class map and defining the traffic match directly in the inspection policy map is that
the class map lets you create more complex match criteria, and you can reuse class maps.
To specify traffic that should not match the class map, use the
match not
command. For example, if the
match not
command specifies the string “example.com,” then any traffic that includes “example.com”
does not match the class map.
For the traffic that you identify in this class map, you can specify actions such as drop, drop-connection,
reset, mask, set the rate limit, and/or log the connection in the inspection policy map.
If you want to perform different actions for each
match
command, you should identify the traffic directly
in the policy map.
a.
Create the class map by entering the following command:
hostname(config)#
class-map type
inspect
http
[
match-all
|
match-any
]
class_map_name
hostname(config-cmap)#
Summary of Contents for 5505 - ASA Firewall Edition Bundle
Page 28: ...Glossary GL 24 Cisco ASA Series CLI Configuration Guide ...
Page 61: ...P A R T 1 Getting Started with the ASA ...
Page 62: ......
Page 219: ...P A R T 2 Configuring High Availability and Scalability ...
Page 220: ......
Page 403: ...P A R T 2 Configuring Interfaces ...
Page 404: ......
Page 499: ...P A R T 2 Configuring Basic Settings ...
Page 500: ......
Page 533: ...P A R T 2 Configuring Objects and Access Lists ...
Page 534: ......
Page 601: ...P A R T 2 Configuring IP Routing ...
Page 602: ......
Page 745: ...P A R T 2 Configuring Network Address Translation ...
Page 746: ......
Page 845: ...P A R T 2 Configuring AAA Servers and the Local Database ...
Page 846: ......
Page 981: ...P A R T 2 Configuring Access Control ...
Page 982: ......
Page 1061: ...P A R T 2 Configuring Service Policies Using the Modular Policy Framework ...
Page 1062: ......
Page 1093: ...P A R T 2 Configuring Application Inspection ...
Page 1094: ......
Page 1191: ...P A R T 2 Configuring Unified Communications ...
Page 1192: ......
Page 1333: ...P A R T 2 Configuring Connection Settings and QoS ...
Page 1334: ......
Page 1379: ...P A R T 2 Configuring Advanced Network Protection ...
Page 1380: ......
Page 1475: ...P A R T 2 Configuring Modules ...
Page 1476: ......
Page 1549: ...P A R T 2 Configuring VPN ...
Page 1550: ......
Page 1965: ...P A R T 2 Configuring Logging SNMP and Smart Call Home ...
Page 1966: ......
Page 2059: ...P A R T 2 System Administration ...
Page 2060: ......
Page 2098: ...1 8 Cisco ASA Series CLI Configuration Guide Chapter 1 Troubleshooting Viewing the Coredump ...
Page 2099: ...P A R T 2 Reference ...
Page 2100: ......