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Credential Server

The Credential Server serves the User Service, which is defined in an OpenAPI 3.0 spec and lives in /openapi/user.yaml.

Usage

First-time setup

Make sure you have Bazel installed. For more detailed instructions on some of the tools we use and how we use them, check out the Silicon Ally Developer Handbook.

Once that's done, make sure the cmd/server/configs/local.conf is relevant for your setup. Specifically:

  • secret_azure_ad_* configuration parameters are only required if use_local_jwts is false
  • secret_auth_private_key_data is the Ed25519 private key used for JWT signing (and the public key is used for validation in the testcreds endpoint).

    • To generate a new key you can run:

       bazel run //scripts:run_keygen

      Which will create test_server.{pub,key} files in the root of the project. From there it can be copied into the config, be careful to replace newlines with \n.

Running the Credential Server

To run the Credential Server, run:

# Run the backend 
bazel run //scripts:run_server

# Note: If you want to use Azure instead of local JWTs, run
# bazel run //scripts:run_server -- --use_azure_auth

Once all dependencies are installed and the server actually starts, you'll see something that looks like:

         █▀▄░█▄█░▀█▀
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░█▀▀░█▀▄░█▀▀░█▀▄░█▀▀░█▀▄░█░█
░█░░░█▀▄░█▀▀░█░█░▀▀█░█▀▄░▀▄▀
░▀▀▀░▀░▀░▀▀▀░▀▀░░▀▀▀░▀░▀░░▀░

At this point, the server is running and accessible at localhost:8080.

Calling the service

The User API exists to exchange end-user credentials from an auth service (in this case, Azure AD B2C) for RMI-specific credentials. When testing locally, there are two different ways to test things out:

  1. Using the web frontend - This repo contains a basic web frontend in the frontend/ directory, check out the README.md there for set up and running instructions. The frontend integrates with Microsoft's MSAL.js to do the full authentication flow + credential exchange.
  • Make sure to run the server with the --use_azure_auth flag.
  1. Using genjwt - The genjwt tool uses your local keypair to generate JWTs. It can generate both the source JWTs (which would normally be issued by Azure AD et al) and apikey JWTs, which are usually the result of the credential exchange
bazel run //scripts:run_genjwt

# This will output something like:
# Token: <header>.<payload>.<sig>

You can take that token from above and exchange it for API credentials, like:

# Be wary of storing sensitive credentials in your Bash (or similar) history.
APIKEY='<token from above>'
curl -H "Authorization: BEARER $APIKEY" -X POST localhost:8080/login/apikey

# This will output something like:
# {"id":"key123","key":"<another token>"}

You can use this new token to query an RMI API:

APIKEY='<the new token>'
# Check the credentials with the Test API
curl -H "Authorization: BEARER $APIKEY" -X POST localhost:8080/credentials:check

Building and running the Docker container locally

To build and run the image locally:

# Build the image
bazel build --@io_bazel_rules_go//go/config:pure //cmd/server:image_tarball

# Load it into Docker. This will print out something like:
# Loaded image ID: sha256:<image SHA>
docker load < bazel-bin/cmd/server/image_tarball/tarball.tar

docker run --rm -it sha256:<image SHA from previous step> --config=/configs/local.conf

If you get an error like:

/server: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.32' not found (required by /server)
/server: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.34' not found (required by /server)

Make sure you included the --@io_bazel_rules_go//go/config:pure flag in bazel build, see pure docs. The problem is that without it, the compiled binary dynamically links glibc against your system, which may use a different version of glibc than the Docker container, which currently uses Debian 11 + glibc 2.28