Forum Discussion

veredgf_96123's avatar
veredgf_96123
Icon for Nimbostratus rankNimbostratus
May 22, 2018

irule to limit parameter and it's values on certain URL

Hi,

 

I need help with an iRule for the following situation -

 

This specific ASM policy has no URL limits (set to WC), but there is a certain URL that we need to have enabled only for the following situation - a single parameter with two values. I need to disable all other options for this URL - i.e., to disallow all other parameters and for that specific parameter to enable only these two values.

 

I have a prepared ASM violation that I want to raise for this particular event.

 

Any ideas?

 

Thanks :-D

 

Vered

 

ASM Advanced WAF
disable
iRules
parameters
security
specific
url
values
  • Yann_Desmarest's avatar
    Yann_Desmarest
    Icon for Cirrus rankCirrus
    Sep 28, 2018

    Hi,

    You can insert an irule within HTTP or ASM events to make sure that your requirement is respected : 

    when HTTP_REQUEST {
    if { [HTTP::path] eq "/x/y/z" } {
        set param1 [URI::query [HTTP::uri] param1]
        set param_array [split [regsub -all {&=|&$} [URI::decode [URI::query [HTTP::uri]]] {}] "&"]
        set param_count [llength $param_array]
        if { !(($param1 eq "value1" or $param1 eq "value2") and ($param_count == 1)) } {
             drop, reject, generate ASM violation, ...
        }
    } 
}

    Regards

    Yann