Brand_image for Kibana branding can be a base64 encoded string

Search Guard
1

This is a post about something I’ve discovered which maybe someone else will see and find useful. The brand_image setting for the Kibana login dialogue as described at

https://docs.search-guard.com/latest/kibana-login-customizing#customizing-the-login-page

doesn’t have to point to an image that you are hosting on a webserver somewhere. If you don’t have anywhere suitable to host such an image you can put a base64 encoded version of it in the configuration file. E.g.

default:
  auth_domains:
  - type: "basic"
    message: "Some words here"
  login_page:
    # base64 of brandlogo.png
    # $ base64 -w 0 brandlogo.png
    brand_image: "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAT4AAABVCAQAAAB6dUCWAAAAIGNIUk0AAHomAACAhAAA+gAAAIDoAAB1MAAA6mAAADqYAAAXandsoonandsoonandsoon"
2

@mikew thank you for bringing this to our attention, it does appear that this option is not outlined in the documentation. We will have this updated shortly.

3

Arguably it’s covered by the documentation saying the value is “An absolute URL”. If one considers a data: URL to be absolute. I don’t think a data: URL can ever be relative. :slight_smile:

4

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