Block specific Client IP if request contains XYZ

[MaxMedov]

Hi, I need help creating the fastest solution (LTM Policy / iRule / other) to do this:
If client IP = X.X.X.X
and request contains = XYZ
Drop the client / or block by WAF message

Thank you!

[Michael_Saleem]

For a very quick solution to match on a single source IP and URI, you could use the following:

when HTTP_REQUEST {
    if { ( ( [IP::addr [IP::client_addr] equals X.X.X.X] ) && ( [string tolower [HTTP::uri]] contains "xyz" ) ) } {
        drop
    }
}

However, if you need need it to be more scalable, I would probably use a data group to hold multiple client IP addresses and then maybe another data group or switch -glob statement to match on multiple URIs.

[CA_Valli]

I'd just advise to avoid using "string tolower" on HTTP uri instruction, since path is case sensitive. 

[Michael_Saleem]

Good point 👍

[MaxMedov]

So what is better?

[CA_Valli]

[HTTP::path] or [HTTP::query] should work just fine for exact matches on path/query parts of the uri 

[Michael_Saleem]

If you are using a mixture of upper and lowercase letters in your URI and you need an exact match on this, then remove the [string tolower]

when HTTP_REQUEST {
    if { ( ( [IP::addr [IP::client_addr] equals X.X.X.X] ) && ( [HTTP::uri] contains "XYZ" ) ) } {
        drop
    }
}

[MaxMedov]

I'll test it thank you!