mongodb-operator-scram-sha-1-mutatingadmissionwebhook

MongoDB Operator SCRAM-SHA-1 MutatingAdmissionWebhook

A Kubernetes Mutating Admission Webhook, using Go.
This is a solution to the lack of SCRAM-SHA-1 support in MongoDB's Community Operator.
The operator writes the authentication method options to the mongodb-config Secret, which this webhook changes.
Related issue on the Operator GitHub: https://github.com/mongodb/mongodb-kubernetes-operator/issues/217

This is proof of concept code, make sure to review carefully before using in a production system.
Reused some code from https://github.com/orangeglasses/k8s-mutate-registry

Run tests

Sadly we don't have tests for now :(

$ go test ./...

Build

$ go build .
$ docker build .

Deploy

Define shell env:

$ export CONTAINER_REPO=<CONTAINER_REPO>
$ export NAMESPACE=mongodb

Deploy to K8s cluster

$ cd deploy
$ ./deploy.sh -a scram-256-webhook -n mongodb -i <CONTAINER_IMAGE>

Test example

$ kubectl create secret generic testsecret --from-literal cluster-config.json="[\"SCRAM-SHA-256\"]"
$ kubectl get secret testsecret -o "jsonpath={.data['cluster-config\.json']}" | base64 -D | jq
# The output should be:
[
  "SCRAM-SHA-256",
  "SCRAM-SHA-1"
]

You can now validate the mongodb-config secret as well:

$ kubectl get secret mongodb-config -o "jsonpath={.data['cluster-config\.json']}" | base64 -D | jq

We successfully mutated our secret spec and added SCRAM-SHA-1 in there, yay !