Echo

This is a very simple container image used to test the $flag$ generation and injection functions of CdsCTF.

Usage

Make sure that the Object returned by the generate() function of checker has a field with the key FLAG (which is usually the default).

pub async fn generate(operator_id) {
    Ok(#{
        FLAG: Flag::new().with_prefix("flag").with_content("4_1nj3ct3d_fl4g").format(),
    })
}

Then use ghcr.io/cdsctf/echo:latest as the image for your challenge, and remember to expose port 9999/tcp.

After starting the challenge environment, connect to the container via Netcat or Telnet to obtain the $flag$.