Forum Discussion

Cirrostratus

Apr 18, 2023

Block specific Client IP if request contains XYZ

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! ...

security

Michael_Saleem

MVP

Apr 18, 2023

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
MVP
Apr 18, 2023
I'd just advise to avoid using "string tolower" on HTTP uri instruction, since path is case sensitive.
- Michael_Saleem
  MVP
  Apr 18, 2023
  Good point 👍
- MaxMedov
  Cirrostratus
  Apr 18, 2023
  So what is better?
  - CA_Valli
    MVP
    Apr 18, 2023
    [HTTP::path] or [HTTP::query] should work just fine for exact matches on path/query parts of the uri