dadrus/heimdall repository overview

⁠Heimdall

⁠Background

Heimdall is inspired by the ZeroTrust idea and tries to adopt it to some extent to web applications.

⁠Heimdall's Promise

Heimdall authenticates and authorizes incoming HTTP requests as well as enriches these with further contextual information and finally transforms resulting subject information into a format, required by the upstream services. And all of that can be controlled by each and every backend service individually.

It is supposed to be used either as

• a Reverse Proxy in front of your upstream API or web server that rejects unauthorized requests and forwards authorized ones to your end points, or as
• a Decision Service, which integrates with your API Gateway (Kong, NGNIX, Envoy, Traefik, etc.) and then acts as a Policy Decision Point.

⁠Reference

• Documentation⁠ - Checkout the documentation for more details.
• GitHub⁠ - Visit heimdall on GitHub.

⁠Image Variants

As of today heimdall is built as a multi-platform image for the following platforms:

• linux/amd64
• linux/arm64
• linux/arm/v7

If you need support for other platforms, don't hesitate to file an issue at GitHub. Contributions are very welcome as well!

All images adhere to the following patterns:

• For stable, respectively released versions, image tags have the suffix of the corresponding version and have the dadrus/heimdall:<version> form. E.g. an image tagged with dadrus/heimdall:0.17.18 is the image for the released 0.17.18 version of heimdall. In addition, there is a dadrus/heimdall:latest tag referencing the latest released version as well.

• Development images are created from the main branch by heimdall's continuous integration and are tagged with the dev and with the dev-<SHA> suffix, where the SHA is the commit in heimdall main from which it was created. For example, after a build at commit 730b2206, an image will be created for dadrus/heimdall:dev-730b2206fdfc688ca42bcdf0e344d8fa6bfba232 and the image dadrus/heimdall:dev will be tagged to it until the next build.

Each published image is signed using Cosign⁠. The signatures are located in the same repository and have the tag pattern sha256-<SHA256>.sig. An SBOM is attached to each image as an attestation, created via Cosign as well. These objects are also present in this repository with tags adhering to the sha256-<SHA256>.att name pattern. Both, the images and the SBOM attestations are signed using keyless signing feature⁠. Please refer to heimdall's Documentation⁠ on how to verify both and extract the SBOM.

⁠License

Heimdall is licensed under Apache-2.0⁠ license.