Cisco 500 Series, Руководство по настройке

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Cisco Security Appliance Command Line Configuration Guide
OL-12172-03
Chapter 25 Configuring Application Layer Protocol Inspection
HTTP Inspection
Where the field is the predefined message header keyword. The regex regex_name argument is the
regular expression you created in Step 1 . The class regex_class_name is the regular expression class
map you created in Step 2 . The length gt max_bytes is the maximum message body length in bytes.
The count gt max_count is the maximum number of header fields.
k. (Optional) To match text found in the HTTP response message status line, enter the following
command:
hostname(config-cmap)# match [ not ] response status-line { regex [ regex_name | class
regex_class_name ]}
Where the regex regex_name argument is the regular expression you created in Step 1 . The class
regex_class_name is the regular expression class map you created in Step 2 .
Step 4 Create an HTTP inspection policy map, enter the following command:
hostname(config)# policy-map type inspect http policy_map_name
hostname(config-pmap)#
Where the policy_map_name is the name of the policy map. The CLI enters policy-map configuration
mode.
Step 5 (Optional) To add a description to the policy map, enter the following command:
hostname(config-pmap)# description string
Step 6
To apply actions to matching traffic, perform the following steps.
a. Specify the traffic on which you want to perform actions using one of the following methods:
•
Specify the HTTP class map that you created in Step 3 by entering the following command:
hostname(config-pmap)# class class_map_name
hostname(config-pmap-c)#
• Specify traffic directly in the policy map using one of the match commands described in Step 3 .
If you use a match not command, then any traffic that does not match the criterion in the match
not command has the action applied.
b.
Specify the action you want to perform on the matching traffic by entering the following command:
hostname(config-pmap-c)# {[
drop
[
send-protocol-error
] |
drop-connection [ send-protocol-error ]| mask | reset ] [ log ] | rate-limit
message_rate
}
Not all options are available for each match or class command. See the CLI help or the Cisco
Security Appliance Command Reference for the exact options available.
The drop keyword drops all packets that match.
The send-protocol-error keyword sends a protocol error message.
The drop-connection keyword drops the packet and closes the connection.
The mask keyword masks out the matching portion of the packet.
The reset keyword drops the packet, closes the connection, and sends a TCP reset to the server
and/or client.
The log keyword, which you can use alone or with one of the other keywords, sends a system log
message.
The rate-limit message_rate argument limits the rate of messages.
You can specify multiple class or match commands in the policy map. For information about the order
of class and match commands, see the “Defining Actions in an Inspection Policy Map” section on
page 21-11 .