Forum Discussion

Bastien_8356's avatar
Bastien_8356
Icon for Nimbostratus rankNimbostratus
Jun 07, 2011

iRule to block user coming from 1 URL

Hi there,

 

 

I'd like to block any http request to any user coming from a particular website.

 

 

It's going on a web server that is behind the F5 and already have a public IP address. It's not a node though, not load balanced nor behind a VIP.

 

 

I came up with this:

 

 

 

when HTTP_REQUEST {

 

if { ([HTTP::header "Referer"] eq "http://blahblah/") }

 

{ drop

 

}

 

}

 

 

Then I tried creating a VIP with the same public IP address and with the iRule, but the apache stop responding.

 

edit: I forgot to create associate it with a pool with this single node, that's how I have to do it ?

 

 

 

Can you help me please ? Many thanks.

 

application delivery
dev
devops
iRules
  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Jun 07, 2011
    Hi Bastien,

    That looks right if you wanted to drop all requests coming into the virtual server with a Referer header of http://blahblah/. Can you test this on a test virtual server and add logging to see what was happening? 

    when HTTP_REQUEST {

   if { ([HTTP::header "Referer"] eq "http://blahblah/") } {
      log local0. "[IP::client_addr]:[TCP::client_port]: Dropping [HTTP::method] to [HTTP::host][HTTP::uri] with Referer [HTTP::header Referer]"
      drop
   } else {
      log local0. "[IP::client_addr]:[TCP::client_port]: Allowing [HTTP::method] to [HTTP::host][HTTP::uri] with Referer [HTTP::header Referer]"
   }
}

    Aaron
  • Bastien_8356's avatar
    Bastien_8356
    Icon for Nimbostratus rankNimbostratus
    Jun 07, 2011
    Hey hoolio, thx I'll give a try, but I didn't succeed in creating a VIP with my webserver as the only node. It's stop responding.

     

    This webserver has 2 public IP, one for https, one for http (that's the one i'm interested in).

     

     

    So I created a VIP with this same IP, profile http, I created a pool with this server. As soon I created the VIP, it stops working :(
  • Michael_Yates's avatar
    Michael_Yates
    Icon for Nimbostratus rankNimbostratus
    Jun 07, 2011
    When you say:

     

     

    So I created a VIP with this same IP

     

     

    The Virtual Server does not have the same IP Address that belongs to the server does it?
  • Bastien_8356's avatar
    Bastien_8356
    Icon for Nimbostratus rankNimbostratus
    Jun 07, 2011
    That's what I did, probably why it didn't work ?

     

     

    I can't change the public IP as it's on the DNS.

     

     

    I would need to use this public IP as the VIP, and change the ip of the server for a private one (and also update my apache config) correct ?
  • Michael_Yates's avatar
    Michael_Yates
    Icon for Nimbostratus rankNimbostratus
    Jun 08, 2011
    If your DNS is pointed to that IP Address, then you could change ownership of the IP Address.

     

     

    Assign the IP Address to the BIG-IP and assign a different IP Address on the server. That way the traffic will flow through the Load Balancer and then to the server (after whatever manipulation you want to do with your iRules.

     

     

    You cannot have the same IP Address on two devices, it creates an IP Address Conflict.

     

     

    DNS -> F5 Virtual Server -> Pool (containing your server IP Address and Port).

     

     

  • Bastien_8356's avatar
    Bastien_8356
    Icon for Nimbostratus rankNimbostratus
    Jun 10, 2011
    I got you, thx ! I can't do this now but I'll up this thread if I have issue with the iRule !
  • trx's avatar
    trx
    Jun 10, 2011
    Hello ,

    Is there another function that can drop the request and stop going through the other IRules?

     

     

     

    Thanks.

     

     

     

    Regards,

     

    TRX

     

  • Colin_Walker_12's avatar
    Colin_Walker_12
    Historic F5 Account
    Jun 10, 2011
    If you want to both drop the request and stop all iRules, try: 

    
drop
event disable all

    Colin
  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Jun 10, 2011
    Hi TRX,

     

     

    I replied to your other post here:

     

     

    [iRules - v4.x]: RE: How do I detect a web dav request?

     

    http://devcentral.f5.com/Forums/tabid/53/aff/16/afv/topic/aft/1179140/afc/1250449/Default.aspx

     

     

    If you're asking about v9 or v10 iRules, you might want to post in this forum instead to get more relevant views of your post.

     

     

    Aaron