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Mike_59458's avatar
Mike_59458
Icon for Nimbostratus rankNimbostratus
Oct 25, 2011

Rule not working as expected

I have installed this rule on a virtual server for a Exchange 2010 Client Access Server. I am trying to block access to OWA on this VS. Code is below:

 

 

(code)

 

when HTTP_REQUEST {

 

HTTP::enable

 

if {[string tolower [HTTP::uri]] eq "/owa" } {

 

HTTP::respond 401

 

}

 

}

 

(end code)

 

 

I get to the login screen but it will not let me log in. I was hoping that the HTTP::respond 401 would send a 401 error screen if the /owa URI was at the end of the URL. Am I missing something?

 

 

Mike

 

application delivery
dev
devops
iRules

5 Replies

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  • nitass's avatar
    nitass
    Icon for Employee rankEmployee
    Oct 25, 2011
    I was hoping that the HTTP::respond 401 would send a 401 error screen if the /owa URI was at the end of the URL.should we use ends_with instead of eq?

    e.g. 

    [root@iris:Active] config  b virtual bar list
virtual bar {
   snat automap
   pool foo
   destination 172.28.17.33:http
   ip protocol tcp
   rules myrule
   profiles {
      http {}
      tcp {}
   }
}

[root@iris:Active] config  b rule myrule list
rule myrule {
   when HTTP_REQUEST {
        if {[string tolower [HTTP::uri]] ends_with "/owa"} {
                HTTP::respond 401
        }
}
}

[root@iris:Active] config  curl -i http://172.28.17.33/test/owa
HTTP/1.0 401 Unauthorized
WWW-Authenticate: Basic realm=""
Server: BigIP
Connection: Keep-Alive
Content-Length: 0
  • Michael_Yates's avatar
    Michael_Yates
    Icon for Nimbostratus rankNimbostratus
    Oct 25, 2011
    Most instances of OWA that I have seen use it has http://owa.domain.com/owa

     

     

    So you might want to use "starts_with".

     

     

    eq / equals is absolute, so if the HTTP::uri contains anything else (upto and including a trailing slash on the owa "/owa/", then it would not qualify as a match.

     

     

    Hope this helps.
  • Bayan_El_Ameen1's avatar
    Bayan_El_Ameen1
    Icon for Nimbostratus rankNimbostratus
    Oct 26, 2011
    Add that you can drop the connection totally by using the "drop" keyword instead of using "HTTP::respond 401"
  • Michael_Yates's avatar
    Michael_Yates
    Icon for Nimbostratus rankNimbostratus
    Oct 26, 2011
    Hi Bayan,

     

     

    Reset might be a better alternative to drop.

     

     

    Reset sends a connection reset for the protocol of the request.

     

    http://devcentral.f5.com/wiki/iRules.reject.ashx

     

     

    Drop / Discard will just drop it and the connection will go into a wait status until it times out.

     

    http://devcentral.f5.com/wiki/iRules.drop.ashx