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Author Ferenc Hernadi

Play With Ingress Authentication

At Banzai Cloud we secure our Kubernetes services using Vault and OAuth2 tokens. This has not always been the case, though we’ve had authentication in our project (even though it was basic) from a very early PoC stage - and we suggest that you do the same.

Usually, inbound connections to Kubernetes cluster services are accessed via Ingress. Just to recap, public services are typically accessed through a loadbalancer service. However, that can be expensive. Ingress gives us a way to route requests to services based on the request host or path, centralizing a number of services into a single entry point. Turning on ingress authentication on Kubernetes is pretty simple and this post is about how to highlight these steps and introduce a small utility that automatically generates ingress passwords. Hopefully, this will make it easier to ramp up a project with a security-centric approach from day one.

Security series:
Authentication and authorization of Pipeline users with OAuth2 and Vault
Dynamic credentials with Vault using Kubernetes Service Accounts
Dynamic SSH with Vault and Pipeline
Secure Kubernetes Deployments with Vault and Pipeline
Policy enforcement on K8s with Pipeline
The Vault swiss-army knife
The Banzai Cloud Vault Operator
Vault unseal flow with KMS
Kubernetes secret management with Pipeline
Container vulnerability scans with Pipeline
Kubernetes API proxy with Pipeline

Set up and configure the Ingress Controller with authentication

Kubernetes easily exposes services through an ingress resource. The simplest way to secure an application is to set up authentication in the Ingress Controller. This feature is accessible with a simple annotation configuration.

The first step is to create authentication credentials via the htpasswd tool.

$htpasswd -nb  user1 SecretPassword42
user1:$apr1$F/4euI1M$v7i/LYuouxfuPyNG.7g.g1

To use it as a Kubernetes secret we have to encode it in base64.

$ echo -n  "user1:$apr1$F/4euI1M$v7i/LYuouxfuPyNG.7g.g1"  |base64
dXNlcjE6LzRldUkxTS9MWXVvdXhmdVB5TkcuN2cuZzE=

Now we can create a Kubernetes secret based on this hash.

$ cat <<EOF | kubectl create -f -
apiVersion: v1
kind: Secret
type: Opaque
metadata:
  name: myingressauthsecret
data:
  auth: dXNlcjE6LzRldUkxTS9MWXVvdXhmdVB5TkcuN2cuZzE=
EOF

Finally, we create the Ingress based on the annotations.

$ cat <<EOF | kubectl create -f -
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: <ingress-name>
  annotations:
    ingress.kubernetes.io/auth-type: basic
    # name of the secret that contains the user/password definitions
    ingress.kubernetes.io/auth-secret: myingressauthsecret
    ingress.kubernetes.io/auth-realm: "Authentication Required - foo"
spec:
  rules:
  - host: <yourchoice>.<cluster-id>.k8s.gigantic.io
    http:
      paths:
      - path: /
        backend:
          serviceName: <service-name>
          servicePort: <service-port>
EOF

The problem with this solution

Great, we now have a very simple, though not extremely secure, functioning authentication. Unfortunately it’s not very practical, making it difficult to manage and to change access. To overcome this problem we created a small application called Ingress Auth Generator that helps manage passwords. It works according to a simple principle. It specifically scans the Ingresses for the auth-secret annotation. After it looks up the secret and finds a username/password field, it generates the correct values instead of the auth attribute. This tool comes in handy when performing a manual release or testing. For example, manually setting the password when deploying a Helm chart

$ helm install --set global.password=example

Auth0

Example Helm chart deployment

Checkout Ingress Auth Generator repository

Auth1

Add Banzai Cloud Helm repository

Auth2

Add Banzai Cloud Helm repo and build the dependencies

Auth3

Install the demo chart with params

Auth4

Test the login

Auth5 Auth6

Conclusion

First, keep in mind that when using Basic authentication https is required. The simplest way of dealing with this in Kubernetes is the Cert-manager. We definitely need a stronger solution for production - check out how we are accomplishing this in Pipeline using OAuth2 and Vault. If you’d like your clusters and deployments to be provisioned on multiple cloud providers and to have their security automatically set up for you, you should consider Pipeline.

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