117 lines
5.0 KiB
Markdown
117 lines
5.0 KiB
Markdown
# Deploying `local-user-authenticator`
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## What is `local-user-authenticator`?
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The `local-user-authenticator` app is an identity provider used for integration testing and demos.
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If you would like to demo Pinniped, but you don't have a compatible identity provider handy,
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you can use Pinniped's `local-user-authenticator` identity provider. Note that this is not recommended for
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production use.
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The `local-user-authenticator` is a Kubernetes Deployment which runs a webhook server that implements the Kubernetes
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[Webhook Token Authentication interface](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#webhook-token-authentication).
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User accounts can be created and edited dynamically using `kubectl` commands (see below).
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## Tools
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This example deployment uses `ytt` and `kapp` from [Carvel](https://carvel.dev/) to template the YAML files
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and to deploy the app.
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Either [install `ytt` and `kapp`](https://carvel.dev/) or use the [container image from Dockerhub](https://hub.docker.com/r/k14s/image/tags).
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As well, this demo requires a tool capable of generating a `bcrypt` hash in order to interact with
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the webhook. The example below uses `htpasswd`, which is installed on most macOS systems, and can be
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installed on some Linux systems via the `apache2-utils` package (e.g., `apt-get install
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apache2-utils`).
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## Procedure
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1. The configuration options are in [values.yml](values.yaml). Fill in the values in that file, or override those values
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using `ytt` command-line options in the command below.
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2. In a terminal, cd to this `deploy-local-user-authenticator` directory
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3. To generate the final YAML files, run: `ytt --file .`
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4. Deploy the generated YAML using your preferred deployment tool, such as `kubectl` or [`kapp`](https://get-kapp.io/).
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For example: `ytt --file . | kapp deploy --yes --app local-user-authenticator --diff-changes --file -`
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## Configuring After Installing
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### Create Users
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Use `kubectl` to create, edit, and delete user accounts by creating a `Secret` for each user account in the same
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namespace where `local-user-authenticator` is deployed. The name of the `Secret` resource is the username.
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Store the user's group membership and `bcrypt` encrypted password as the contents of the `Secret`.
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For example, to create a user named `ryan` with the password `password123`
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who belongs to the groups `group1` and `group2`, use:
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```bash
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kubectl create secret generic ryan \
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--namespace local-user-authenticator \
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--from-literal=groups=group1,group2 \
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--from-literal=passwordHash=$(htpasswd -nbBC 10 x password123 | sed -e "s/^x://")
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```
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### Get the `local-user-authenticator` App's Auto-Generated Certificate Authority Bundle
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Fetch the auto-generated CA bundle for the `local-user-authenticator`'s HTTP TLS endpoint.
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```bash
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kubectl get secret api-serving-cert --namespace local-user-authenticator \
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-o jsonpath={.data.caCertificate} \
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| base64 -d \
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| tee /tmp/local-user-authenticator-ca
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```
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### Configuring Pinniped to Use `local-user-authenticator` as an Identity Provider
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When installing Pinniped on the same cluster, configure `local-user-authenticator` as an Identity Provider for Pinniped
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using the webhook URL `https://local-user-authenticator.local-user-authenticator.svc/authenticate`
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along with the CA bundle fetched by the above command.
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### Optional: Manually Test the Webhook Endpoint
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1. Start a pod from which you can curl the endpoint from inside the cluster.
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```bash
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kubectl run curlpod --image=curlimages/curl --command -- /bin/sh -c "while true; do echo hi; sleep 120; done"
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```
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1. Copy the CA bundle that was fetched above onto the new pod.
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```bash
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kubectl cp /tmp/local-user-authenticator-ca curlpod:/tmp/local-user-authenticator-ca
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```
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1. Run a `curl` command to try to authenticate as the user created above.
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```bash
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kubectl -it exec curlpod -- curl https://local-user-authenticator.local-user-authenticator.svc/authenticate \
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--cacert /tmp/local-user-authenticator-ca \
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-H 'Content-Type: application/json' -H 'Accept: application/json' -d '
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{
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"apiVersion": "authentication.k8s.io/v1beta1",
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"kind": "TokenReview",
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"spec": {
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"token": "ryan:password123"
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}
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}'
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```
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When authentication is successful the above command should return some JSON similar to the following.
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Note that the value of `authenticated` is `true` to indicate a successful authentication.
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```json
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{"apiVersion":"authentication.k8s.io/v1beta1","kind":"TokenReview","status":{"authenticated":true,"user":{"username":"ryan","uid":"19c433ec-8f58-44ca-9ef0-2d1081ccb876","groups":["group1","group2"]}}}
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```
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Trying the above `curl` command again with the wrong username or password in the body of the request
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should result in a JSON response which indicates that the authentication failed.
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```json
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{"apiVersion":"authentication.k8s.io/v1beta1","kind":"TokenReview","status":{"authenticated":false}}
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```
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1. Remove the curl pod.
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```bash
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kubectl delete pod curlpod
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```
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