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| Filter RDP access http://www.steveshipway.org/forum/viewtopic.php?f=22&t=2017 |
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| Author: | zygolux [ Wed Apr 29, 2009 3:22 am ] |
| Post subject: | Filter RDP access |
Hi all, I would like to filter RDP accesses on some servers. It worked pretty well until I found that RDP and Citrix accesses are almost recorded the same way in the event log So, I read dozen of pages on regexp, but I am still not able to achieve what I want ... I would like to filter Audit Sucess with event ID 528 - no problem there. Plus I added the following regexp in the field "Match string (regexp)": .*Logon.*Type.*10.*(?!(127.0.0.1)).* My understanding (which is for sure wrong as it does not work) is: keep strings where there is something, then the word "Logon", then something, then "Type", then something, then "10" then something which does not contains 127.0.0.1. I tried as well :.*Logon.*Type.*10.*(?!(.*127.0.0.1.*)).* - Same result Actually I would to filter all messages containing "Logon Type:10" but not "127.0.0.1". What I got so far is all messages containing "Logon Type:10". The negative string seems to be ignored. Any help will be appreciated Julien. |
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| Author: | stevesh [ Wed Apr 29, 2009 11:15 am ] |
| Post subject: | Re: Filter RDP access |
Nope, thats not a valid regexp. '.*' matches anything, but '?!' is not valid (I think it may be an extended regexp but not 'standard' regexp) Here's one way to do it, using 2 filters Make the first filter match eventid: 528 regexp: Logon.*Type.*10.*127\.0\.0\.1 and have an action of 'None' (IE dont send any alert). The next filter matches eventid: 528 regexp: Logon.*Type.*10 and sends the alert. Therefore, if it is a 127.0.0.1 message, the first filter matches, and nothing is done. Otherwise, it will fall through to the second filter and match that. Remember only the FIRST matching filter is actioned, and v1.9.1 allows the 'none' target, so it should work... |
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| Author: | zygolux [ Wed Apr 29, 2009 9:50 pm ] |
| Post subject: | Re: Filter RDP access |
Thanks a lot for the help. I installed 1.9.2 version as I previously ran 1.8.3 and created the filters like you suggested. Now, I understand better the way filters work and how they are processed When you say action "none", I assume it means "Service Status= (4) ignore", right ? |
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| Author: | stevesh [ Thu Apr 30, 2009 10:48 am ] |
| Post subject: | Re: Filter RDP access |
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