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TIP Based on the processing of match and class commands in a layer 7 policy map, your log policies should appear before your drop and reset policies The remainder chapters in this part will cover these components in much more depth for each of the applications that supported advanced protocol inspection
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To use a layer 7 policy map, you must reference it in your inspection rule that s defined in a layer 3/4 policy map, like this:
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ciscoasa(config)# policy-map layer_3/4_policy_map_name ciscoasa(config-pmap)# class layer_3/4_class_map_name ciscoasa(config-pmap-c)# inspect application_name layer_7_policy_map_name
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To give you a basic idea how layer 7 and layer 3/4 policy maps are used, examine the following example:
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ciscoasa(config)# regex url_cisco1 cisco1\com ciscoasa(config)# regex url_cisco2 cisco2\com ciscoasa(config)# class-map type regex match-any MYURLs ciscoasa(config-cmap)# match regex cisco1 ciscoasa(config-cmap)# match regex cisco2 ciscoasa(config-cmap)# exit ciscoasa(config)# class-map type inspect http match-all L7-http-class ciscoasa(config-cmap)# match req-resp content-type mismatch ciscoasa(config-cmap)# match request body length gt 1100 ciscoasa(config-cmap)# match not request uri regex class MYURLs ciscoasa(config-cmap)# exit ciscoasa(config)# policy-map type inspect http L7-http-map ciscoasa(config-pmap)# class L7-http-class ciscoasa(config-pmap-c)# drop-connection log ciscoasa(config-pmap-c)# exit ciscoasa(config-pmap)# match req-resp content-type mismatch ciscoasa(config-pmap-c)# reset log ciscoasa(config-pmap-c)# exit ciscoasa(config-pmap)# parameters ciscoasa(config-pmap-p)# protocol-violation action log ciscoasa(config-pmap-p)# exit ciscoasa(config-pmap)# exit ciscoasa(config)# access-list Web_Server_ACL permit tcp any host 192111 eq 80
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ciscoasa(config)# class-map L3_Web_Server ciscoasa(config-cmap)# match access-list Web_Server_ACL ciscoasa(config-cmap)# exit ciscoasa(config)# policy-map L3-web-policy-map ciscoasa(config-pmap)# class L3_Web_Server ciscoasa(config-pmap-c)# inspect http L7-http-map
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Again, I don t want to focus on the complete preceding configuration and all the specific commands, since many of these are discussed in 12 for layer 7 policies Instead I want to focus on how all class and policy maps work together and how they re referenced In this example, it is probably easier to work through the example in reverse, starting at the bottom I ve highlighted the map names and how they are referenced to make it a little bit easier to understand how all these components work together A layer 3/4 policy map called L3-web-policy-map includes a layer 3/4 class map called L3_Web_Server, which includes TCP port 80 traffic being sent to the web server (192111) Notice that the policy for this traffic is to perform application layer inspection for HTTP, but the inspection rule is qualified with a layer 7 policy map, L7-http-map This layer 7 policy map includes a layer 7 class map called L7-http-class, which is looking for certain things in the payload, that, if seen, will drop and log the connections Notice that the class map references a regular expression class map, MYURLs, which includes two regular expressions (a URL that contains cisco1com or cisco2com ) An additional match and parameter command defines more policies for information found in the payload of HTTP connections TIP As you can see from this example, configuring policies can be a very complex process If you are a novice with the appliances, I recommend that you do not use the CLI to configure policies Instead use ASDM, since it has a wizard-driven process to set this up You can then look at the commands the appliance creates to help you learn how it is configured from the CLI ASDM is discussed in 27
SERVICE POLICIES
A service policy is basically the activation of your layer 3/4 policy maps The following sections will show you how to activate and verify the policies on your appliance
Activating a Layer 3/4 Policy Map
You can activate a layer 3/4 policy map globally (all interfaces) or on a specific interface; however, you can only have one policy map applied per location In the case where there is a global policy and an interface policy, the interface policy overrides the global policy settings Here is the syntax to activate a layer 3/4 policy map:
ciscoasa(config)# service-policy layer_3/4_policy_map_name {global | interface logical_if_name}
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