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Preet_pk's avatar
Preet_pk
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3 years ago

Prevent Banner grabbing in F5 via irule

Hi, We have multiple web applications running on a single Virtual server with host/domain based pool routing. For eg: red.lab.ae blue.labe.ae irule: when HTTP_REQUEST { switch [string tolower ...
application delivery
JoshBecigneul's avatar
JoshBecigneul
Icon for MVP rankMVP
3 years ago

Hi Preet_pk 

If I'm understanding your question correctly, one option could be to add a default branch to the switch statement and then call either the drop or reject commands. Another way would be to use HTTP::respond and send back a 404 Not Found which might be better for troubleshooting purposes.

Thanks,
Josh

  • Preet_pk's avatar
    Preet_pk
    Icon for Cirrus rankCirrus
    3 years ago

    Hi,

    Can you share complete irule syntax so as to test it.

    • JoshBecigneul's avatar
      JoshBecigneul
      Icon for MVP rankMVP
      3 years ago

      Hi Preet_pk 

      That would look something like this with the addition of the default option. I commented the other two options. More info on the switch operator is here: https://clouddocs.f5.com/api/irules/switch.html

      when HTTP_REQUEST {
  switch [string tolower [HTTP::host]] {
    red.lab.ae {
        pool Red_Pool1
    }
    green.lab.ae {
        pool Green_Pool1
    }
    default {
        drop
        # reject
        # HTTP::respond 404 content "Not Found" noserver
    }
  }
}