We create the regexes and match them in a class-map.
For example we want to allow only pages and only uris that contain "/test/". Lets assume that we want to allow only specific websites. Policy-map type inspect http allow-url-policy Match not request header host regex allowex2 The policy map is used for http inspection in another policy-map ( global_policy) and applied with a service-policy.Ĭlass-map type inspect http match-all allow-url-class In other words, if the page you browse is not it will be reset. Then in the policy-map allow-url-policy the connection is reset. The match statement is met the regex is NOT matched by the url. Note that if the match statements is matched the class-map is met. We create the regex and match them (match statement) in a class-map. Service-policy block-user-url-policy interface inside The rest of the users (not matching/denied in the access-list) will be able to go anywhere.Īccess-list user-acl extended deny tcp host 192.168.1.2 any eq wwwĪccess-list user-acl extended permit tcp any any eq www What this policy-map is actually doing is to match on all the users except the unrestricted ones ( class block-user-class) and block them from going to the specified websites ( inspect http block-url-policy. Thus the block-user-url-policy will be applied to an interface with a service-policy. That policy-map will do the http inspection for the allowed websites policy-map block-url-policy (that part is the same as above). It will be matched in a new class-map ( block-user-class) which in turn will be used in a separate policy-map ( block-user-url-policy). This access-list ( user-acl) will match all the users with the exception of the ones that need unrestricted access. We will use approximately the same configuration as in the example above but this time we will need an extra access-list, a class-map and a policy-map. ip address 192.168.1.2) that need access to any website and the rest of the users need to be blocked from specific websites ( Note that you need to understand the example above to be able to follow the process of this example). Policy-map type inspect http block-url-policyĪllow every url for specific hosts, block specific urls for the restįinally lets say that we have a few hosts (administrators, i.e. The policy-map block-url-policy is used for http inspection in another policy-map ( global_policy) and applied with a service-policy.Ĭlass-map type inspect http match-any block-url-class The rest are allowed (not and not uri containing "/test/"). Then in the policy-map block-url-policy whatever meets the class-map ( OR uri containing "/test/") is reset. Note that if ANY regex is matched then the class-map will actually be met. We will create the regexes and match them in a class-map. For example we want to block specific anything under and uris that contain "/test/". Lets assume that we want to block some specific websites. The ASA will not scale being used in an enterprise with large regex matches and large volumes of HTTP traffic.
URL filtering directly on the ASA using regex, should be used only sparsely when broad classifications can be applied, with limited regex patterns. Such web filtering engines can provide much more robust filtering based on classes of sites. NOTE: Though, we need to highlight that for Enterprise URL Filtering, customers should be steered toward using WebSense or N2H2 integration with the ASA. In that way the http inspection action will be applied to the traffic that hits an interface. Then the policy-maps will be applied with an http inspection in another policy-map that will be applied to an interface. These class-maps will be used in policy-maps to define the drop action. We will create regular expressions (regex) that will be matched in class-maps of type http. Examples are or or The mechanism used to apply url filtering is Modular Policy Framework (MPF). In other words, any page path that contains "/test/" will be url filtered. Also, we will allow or block "/test/" in the uri. Such pages would be or /exampledir/page.html. In other words, any user browsing to any page that is behind will be subject to url filtering. From now and onwards we will allow or block the domain. They can be found in the ASA configuration guides. Of course the ASA can match on other things too. In this article we will either block or allow domains in urls and words in the uri.
#Cisco asa websense filter https full
After reading it carefully someone should be able to take full advantage of url filtering and use it for his needs.
#Cisco asa websense filter https how to
This article aims to educate the user on how to use this feature. It can be used to block or allow users from going to certain urls/websites. One of the ASA features is url filtering. Allow every url for specific hosts, allow only specific urls for the rest.Allow every url for specific hosts, block specific urls for the rest.
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