Forum Discussion

Nimbostratus

Oct 21, 2020

Solved

IRule for Exact resource access rejection

I would like to know the feasibility of implementing iRules for below scenario, kindly suggest whether it is achievable or not. https://my.domain.com/mrj/home/srt/portal/prtroot/com.dev.net.sen...

Dario_Garrido
Oct 22, 2020
Hello NetWork.
Actually the previous sentence has a mistake. It should be like this.
set uri [getfield [HTTP::uri] "?" 1]
This is used to remove de Query parameter of the URI. For example if you receive something like this:
/mrj/home/srt/portal/prtroot/com.dev.net.sendemail?myuser=john
Taking into account that you need to reject any URI related with
/mrj/home/srt/portal/prtroot/com.dev.net.sendemail*
Then you should use "starts_with" instead of "ends_with", and the sentence before would not be necessary.
Your iRule should be like this:
when HTTP_REQUEST { if { [HTTP::uri] == "/" } { HTTP::redirect "http://[HTTP::host]/mrj" } elseif { [string tolower [HTTP::uri]] starts_with "/mrj/home/srt/portal/prtroot/com.dev.net.sendemail" } { reject } elseif { [string tolower [HTTP::uri]] starts_with "/mrj" or [string tolower [HTTP::uri]] starts_with "/web" or [string tolower [HTTP::uri]] starts_with "/htmlb" } { pool pool-A } elseif { [string tolower [HTTP::uri]] starts_with "/abc" } { pool pool-B } elseif { [string tolower [HTTP::uri]] starts_with "/" } {reject} }
Please, if this was helpful don't forget to mark my answer as 'the best' to help me for the contribution.
Regards,
Dario.

Dario_Garrido

Noctilucent

Oct 22, 2020

Hello NetWork.

Yes, it's feasible. Try this:

when HTTP_REQUEST {
	set uri [getfield [HTTP::uri] "?" 2]
	if { $uri ends_with "/mrj/home/srt/portal/prtroot/com.dev.net.sendemail" } { reject }
}

Regards,

Dario.

NetWork
Nimbostratus
Oct 22, 2020
Hi Dario,

Thanks a lot for your response!

Below is our existing and working iRule:

  when HTTP_REQUEST {
if { [HTTP::uri] == "/" } { HTTP::redirect "http://[HTTP::host]/mrj" }
elseif { [string tolower [HTTP::uri]] starts_with "/mrj" or [string tolower [HTTP::uri]] starts_with "/web" or [string tolower [HTTP::uri]] starts_with "/htmlb" }
     { pool pool-A }
   elseif { [string tolower [HTTP::uri]] starts_with "/abc" }
     { pool pool-B }
   elseif { [string tolower [HTTP::uri]] starts_with "/" }
     {reject}
}

If we modify it as below, will it work?

when HTTP_REQUEST {

set uri [getfield [HTTP::uri] "?" 2]

if { [HTTP::uri] == "/" } { HTTP::redirect "http://[HTTP::host]/mrj" }

elseif { $uri ends_with "/mrj/home/srt/portal/prtroot/com.dev.net.sendemail" }
    { reject }

elseif { [string tolower [HTTP::uri]] starts_with "/mrj" or [string tolower [HTTP::uri]] starts_with "/web" or [string tolower [HTTP::uri]] starts_with "/htmlb" }
     { pool pool-A }

elseif { [string tolower [HTTP::uri]] starts_with "/abc" }
     { pool pool-B }

   elseif { [string tolower [HTTP::uri]] starts_with "/" }
     {reject}
}

Also, can you please help to understand why we need to put "2" in set uri [getfield [HTTP::uri] "?" 2] ??

And, in case if we want to reject anything after sendemail i.e /mrj/home/srt/portal/prtroot/com.dev.net.sendemail*, how that can be achieved.
- Dario_Garrido
  Noctilucent
  Oct 22, 2020
  Hello NetWork.
  Actually the previous sentence has a mistake. It should be like this.
  set uri [getfield [HTTP::uri] "?" 1]
  This is used to remove de Query parameter of the URI. For example if you receive something like this:
  /mrj/home/srt/portal/prtroot/com.dev.net.sendemail?myuser=john
  Taking into account that you need to reject any URI related with
  /mrj/home/srt/portal/prtroot/com.dev.net.sendemail*
  Then you should use "starts_with" instead of "ends_with", and the sentence before would not be necessary.
  Your iRule should be like this:
  when HTTP_REQUEST { if { [HTTP::uri] == "/" } { HTTP::redirect "http://[HTTP::host]/mrj" } elseif { [string tolower [HTTP::uri]] starts_with "/mrj/home/srt/portal/prtroot/com.dev.net.sendemail" } { reject } elseif { [string tolower [HTTP::uri]] starts_with "/mrj" or [string tolower [HTTP::uri]] starts_with "/web" or [string tolower [HTTP::uri]] starts_with "/htmlb" } { pool pool-A } elseif { [string tolower [HTTP::uri]] starts_with "/abc" } { pool pool-B } elseif { [string tolower [HTTP::uri]] starts_with "/" } {reject} }
  Please, if this was helpful don't forget to mark my answer as 'the best' to help me for the contribution.
  Regards,
  Dario.