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Authentication with Keycloak

In this guide we walk through the process of configuring a Nessie Server to authenticate clients against a local Keycloak server. Docker is use at the runtime environments for both servers.

Setting up Keycloak

For the purposes of this guide we will only do use a simple Keycloak configuration, that is still sufficient to demonstrate how OpenID authentication works in Nessie servers.

First, start a Keycloak container using its latest Docker image.

docker run -p 8080:8080 -e KEYCLOAK_USER=admin -e KEYCLOAK_PASSWORD=admin \
  --name keycloak

Note the admin username and password. Those values will be required to log into the Keycloak Administration Console that should now be available at http://localhost:8080/auth/admin/

The default realm is called Master. On the left-hand pane find the Manage > Users page and click Add User on the right side of the (initially empty) users table.

Enter the username “nessie” and click Save. Now, under the Credentials tab of the nessie user page set password to nessie and turn off the Temporary flag. Click Set Password.

For the sake of convenience let’s increase the default token expiration time. Goto Clients > admin-cli > Advanced Settings. Set Access Token Lifespan to 1 day and click Save.

Now we are ready to generate an access_token for the nessie user. Use the following command to obtain a token. Then, store it in the NESSIE_AUTH_TOKEN environment variable. It will be required to access Nessie APIs later.

curl -X POST \
  http://localhost:8080/auth/realms/master/protocol/openid-connect/token \
  --user admin-cli:none \
  -d 'username=nessie' \
  -d 'password=nessie' \
  -d 'grant_type=password'
export NESSIE_AUTH_TOKEN=$(curl -X POST \
  http://localhost:8080/auth/realms/master/protocol/openid-connect/token \
  --user admin-cli:none \
  -d 'username=nessie' \
  -d 'password=nessie' \
  -d 'grant_type=password' |jq -r .access_token

Setting up Nessie Server

Start the Nessie server container from the projectnessie/nessie Docker image in authenticated mode, using the Keycloak server for validating user credentials.

docker run -p 19120:19120 \
  -e QUARKUS_OIDC_AUTH_SERVER_URL=http://localhost:8080/auth/realms/master \
  -e QUARKUS_OIDC_CLIENT_ID=projectnessie \
  --network host projectnessie/nessie-unstable:0.9.3-SNAPSHOT

Note: this example uses a snapshot build. When Nessie 1.0 is released, the latest stable image will be usable with the instructions from this guide.

Using Nessie CLI

Now that the Nessie server runs in authenticated mode with a Keycloak, clients have to provide credentials in the form of bearer authentication tokens. For example:

nessie --auth-token $NESSIE_AUTH_TOKEN remote show

Note: since the name of the NESSIE_AUTH_TOKEN variable matches Nessie CLI configuration naming conventions, the client can automatically find it in the environment, and it does not have to be specified as a command line option. All nessie CLI command will automatically use that token for authenticating their requests. For example:

nessie log