Custom App for CRL downloads

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Custom App for CRL downloads

L1 Bithead


I am trying to create a custom app that will match CRL downloads, to allow them without any questions ask. Shouldn't be too hard : on a previous web security gateway, I would match a pattern like the following: "http://([^/:])*crl.*\.crl"

When translated to an app signature, I already know I am looking for two patterns, on the following contexts:

  • http-req-host-header
  • http-req-uri-path

Now, my issue is that my pattern are incredibly simple. I am not able to reach the 7 bytes limit with this. One other way would be to match the MIME type in the RSP header I guess... application/pkix-crl or application/x-pkcs7-crl are fine. The issue is with the occasional misconfigured root CAs that still reports text/plain.

So....  Is there anything I can do with this to simply allow CRLs without creating a huge custom category?

Thank you.


Hi There


So are you running the app successfully now in your environment?

I have it deployed on a larger scale now and so far if i add a URL filterping profile with alert for all alloed categories I do see only *.crl files in the URL log hitting. But in traffic Log I have a lot more hits (to the same public IPs) then what I have in the URL log.




There's no home like

Yes, appears to be working ok for us.

L0 Member

I wonder if even the latest version can do that?

L3 Networker

Hi Hebejena


How do you mean "if the latest version can do that" do you mean if there is a app-id or a built in way from Palo Alto to cover this use-case with their latest PAN-OS releases? 



There's no home like

That would be ideal really.  Something that would cover all .crl cases.

L0 Member

shouldn't be all "/" escaped?



like this



Just guessing because it was not working for me.

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