Upgraded to 3.1, URL wildcards not working
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Upgraded to 3.1, URL wildcards not working

L4 Transporter

Just upgraded to 3.1.0 from 3.0.6.

I had the following URL filtering profile that I used on an inbound rule with SSL decryption so that people could only connect to valid Exchange/Outlook Web Access URLs:

webmail.ourdomain.co.uk/favicon.ico

webmail.ourdomain.co.uk/Exchange

webmail.ourdomain.co.uk/Exchweb

webmail.ourdomain.co.uk/Microsoft-Server*

webmail.ourdomain.co.uk/OMA

webmail.ourdomain.co.uk/public

webmail.ourdomain.co.uk/rpc

When I upgraded that rule stopped working, which I found is because the wildcard syntax has changed in 3.1.

The issue is that it seems the PAN truncates the entire URL that is fed to the Exchange server so I can't filter on the full length virtual directory name which is /Microsoft-Server-Activesync, if I add that to my URL policy I see blocks in the URL logs for:

URL: webmail.ourdomain.co.uk/microsoft-server-activesync?user=joe&devic

URL: webmail.ourdomain.co.uk/microsoft-server-activedeviceid=imei35766301

How do I fix this please?
4 REPLIES 4

L5 Sessionator

In the change in 3.1.x  wildcards need to be preceeded or followed by the following separators:

      .

     /

     ?

     &

     =

     ;

     +

Every substring that is separated by the characters listed above is considered a token.  A token can be any number of ASCII characters that does not contain any separator character or *.  For example, the following patterns are valid:

*.yahoo.com   (tokens are *,  yahoo, and com)

www.*.com   (tokens are www, *, and com)

www.yahoo.com/search=*    (tokens are www, yahoo, com, search, * )

*webmail.ourdomain.co.uk/Microsoft-Server** is invalid because "*" is not the only character in the token  ie "*webail" and "Server**".  Without valid separators you filter won't work. 

Thanks for the reply.

I had read that, the problem is that the PAN won't recognize the true URL it seems to truncate it.

The actual virtual Exchange directory would be "webmail.ourdomain.com/Microsoft-Server-Activesync" but if I enter that I see blocks because as per the log entry that I posted, the PAN seems to truncate the entire URL.

I could simply list webmail.ourdomain.com but the whole idea here is that I want to only allow access to the legitimate Outlook/Exchange Virtual Directories in IIS.

Its possible that this is a bug because it shouldn't be truncating.  Please open a case with your support on this one.

Have done (Vadition).  Presumably there are other customers using a PAN to reverse proxy Exchange/OWA?  I can't imagine I'm trying to do anything unusual so if anyone's reading who is doing this, be interested to know your config.

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