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The following sections will discuss the configuration of RTSP inspection For in-depth inspection policies, you might need to create a layer 7 policy map and, possibly, a layer 7 class map The following sections will discuss how to create these, as well as how to enable RTSP inspection in a layer 3/4 policy map
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RTSP Layer 7 Class Maps
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Here are the commands to create a layer 7 class map for RTSP inspection:
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ciscoasa(config)# class-map type inspect rtsp [match-all] L7_class_map_name ciscoasa(config-cmap)# description string ciscoasa(config-cmap)# match [not] request-method method_name ciscoasa(config-cmap)# match [not] url-filter regex {class regex_class_name | regex_name}
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The request-method parameter allows you to match on commands seen or unseen within the signaling connection (port 554) The commands you can include are announce, describe, get_parameter, options, pause, play, record, redirect, setup, set_parameter, and teardown The url-filter parameter allows you to match on one or more URLs in RTSP control messages
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RTSP Layer 7 Policy Maps
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Here are the commands to create a layer 7 policy map for RTSP inspection:
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ciscoasa(config)# policy-map type inspect rtsp L7_policy_map_name ciscoasa(config-pmap)# description string ciscoasa(config-pmap)# match L7_class_map_parameters ciscoasa(config-pmap-c)# {[drop-connection [log] | rate-limit #_of_messages} ciscoasa(config-pmap-c)# exit ciscoasa(config-pmap)# class L7_class_map_name ciscoasa(config-pmap-c)# {[drop-connection [log] | rate-limit #_of_messages} ciscoasa(config-pmap-c)# exit ciscoasa(config-pmap)# parameters ciscoasa(config-pmap-p)# reserve-port-protect ciscoasa(config-pmap-p)# url-length-limit length
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Instead of creating an application layer class map, you can also reference these values within the layer 7 policy map with the match command The advantage of using layer 7 class maps is that you can apply different policies to different classes (class maps) Either you can have the appliance drop the connection and/or log the match if you are matching on a URL, or you can rate-limit the RTSP commands depending upon what you are matching on in an associated class map or match command Within the parameters section in a layer 7 policy map, you can restrict usage on the reserve port when performing multimedia negotiations (reserve-port-protect command) and restrict the limit of URLs, in bytes, in RTSP control messages (urllength-limit command) The length can be from 0 to 6,000 bytes
RTSP Layer 3/4 Policy Maps
If all you are interested in is dynamically adding the two UDP multimedia connections to the conn table and fixing embedded addressing information, then you do not need to implement a layer 7 policy for RTSP inspection However, if you need to implement a layer 7 RTSP policy, you must have a corresponding layer 3/4 policy map that references it:
ciscoasa(config)# policy-map L3/4_policy_map_name ciscoasa(config-pmap)# class L3/4_class_map_name ciscoasa(config-pmap-c)# inspect rtsp [L7_policy_map_name]
NOTE By default RTSP inspection is enabled in the global policy, which is activated on all interfaces on the appliance
14:
Multimedia and Policies
RTSP Example Configuration
Let s look at a configuration example that implements RTSP inspection:
ciscoasa(config)# regex badurl_1 "+\[Aa][Vv][Ii]" ciscoasa(config)# regex badurl_2 "+\[Rr][Mm]" ciscoasa(config)# regex badurl_3 "+\[Aa][Ss][Pp]" ciscoasa(config)# class-map type regex badurls ciscoasa(config-cmap)# match regex badurl_1 ciscoasa(config-cmap)# match regex badurl_2 ciscoasa(config-cmap)# match regex badurl_3 ciscoasa(config)# policy-map type inspect rtsp L7-rtsp-policy ciscoasa(config-pmap)# match url-filter regex class badurls ciscoasa(config-pmap-p)# drop-connection log ciscoasa(config)# policy-map global_policy ciscoasa(config-pmap)# class inspection_default ciscoasa(config-pmap-c)# inspect rtsp L7-rtsp-policy ciscoasa(config)# service-policy global_policy global
At the top of the example, three regular expressions are looking for URLs that end in avi , rm , or asp , in upper- or lowercase These are included in a regular expression class map The layer 7 policy map (L7-rtsp-policy) will drop and log any RTSP connections that reference the URLs in the regular expression class map This layer 7 policy is then referenced in the default layer 3/4 class and policy map configuration across all appliance interfaces
H323 INSPECTION
H323 is an ITU-T standard for the bi-directional exchange of voice, video, and data H323 is somewhat of a hybrid protocol in that it supports both video and audio connections As you will see in the following sections, H323, like most multimedia applications, is a more difficult protocol to deal with than simple VoIP connections, or even RTSP Unlike SIP, Skinny, RTSP, or FTP, an H323 application can have many connections that are set up between two devices The following sections will cover the components of H323, how connections are set up, how the application inspection feature for H323 on the appliances functions, and how to configure application inspection NOTE H323 was actually the first VoIP protocol to use RTP (which everyone now uses) All other VoIP protocols are basically a collection of other protocols, but typically rely on RTP for the actual voice connections
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