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credstash-operator

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A Kubernetes Controller for using Credstash Secrets in Kubernetes

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# credstash-operator

## Overview

credstash-operator is a Kubernetes operator that creates Kubernetes secrets from [credstash](https://github.com/fugue/credstash) secrets.

This controller will go and fetch credstash keys as specified in the CRD spec and then go and manage a Kubernetes Secret that contains their values.

* The controller will use the name and the latest versionof the credstash key by default in the underlying managed Secret unless specified otherwise in the CredstashSecret CRD.
* The controller can use one or more Credstash Secrets in the same CRD allowing you to have a Kubernetes Secret from multiple Credstash Secrets.
* If a CredstashSecret CRD gets updated, the controller will update the underlying managed Secret.
* If a CredstashSecret CRd gets deleted, the controller will delete the underlying managed Secret.

### Using the operator

Once configured submitting a CredstashSecret custom resource like below will create a secret from the credstash keys specified
```yaml
apiVersion: credstash.ouzi.tech/v1alpha1
kind: CredstashSecret
metadata:
  name: very-secret
  namespace: test
spec:
  # Name of the target secret (Optional. Defaults to the CR name)
  name: example
  # List of secrets from credstash to add to the body of the secret 
  secrets:
      # key: the key in credstash to fetch. (Required)
    - key: test-secret
      # name: the name of the resulting data element in the k8s secret (Optional. Defaults to the credstash key)
      name: renamed-test-secret
      # table: the dynamoDB table that contains the credstash secrets (Optional. Defaults to credential-store)
      table: credential-store
      # version: the version of the secret in credstash for the provided key (Optional. Defaults to the latest version)
      version: 1
      # context: key value pairs to the encryption context (Optional)
      context:
        key1: value1
        key2: value2
  # type: the type of the resulting kubernetes secret (Optional. Defaults to Opaque)
  type: Opaque
```

To see the credstash secrets in the cluster, just run:
`kubectl get credstashsecrets --all-namespaces`
and you will get a list of the credstash secrets and the kubernetes secret being managed

```
NAMESPACE        NAME                                           SECRET
cert-manager     clouddns-dns01-solver-svc-acct                 clouddns-dns01-solver-svc-acct
oauth-proxy      github-oauth-secret                            github-oauth-secret
prow-test-pods   aws-ouzi-creds                                 aws-ouzi-creds
prow-test-pods   gcs-credentials                                gcs-credentials
prow-test-pods   github-ssh-key                                 github-ssh-key
prow-test-pods   github-token                                   github-token
prow-test-pods   ouzi-bot-dockerconfig                          ouzi-bot-dockerconfig
prow-test-pods   ouzidev-cannon-prow-gcloud-service-account     ouzidev-cannon-prow-gcloud-service-account
prow-test-pods   ouzidev-cannon-prow-gke-kubeconfig             ouzidev-cannon-prow-gke-kubeconfig
prow-test-pods   terraform-ouzidev-aws-service-account          terraform-ouzidev-aws-service-account
prow             github-ssh-key                                 github-ssh-key
prow             github-token                                   github-token
prow             oauth-config                                   oauth-config
prow             prow-bucket-gcs-credentials                    prow-bucket-gcs-credentials-2
prow             slack-token                                    slack-token  
```

#### Custom secret types
If you want to create a secret that is not of type `Opaque`, provide a different secret type in .spec.type
For example a dockerconfigjson secret would look as follows:
```yaml
apiVersion: credstash.ouzi.tech/v1alpha1
kind: CredstashSecret
metadata:
  name: dockerconfigjson
  namespace: test
spec:
  # Name of the target secret (Optional. Defaults to the CR name)
  name: dockerconfigjson
  # List of secrets from credstash to add to the body of the secret 
  secrets:
      # key: the key in credstash to fetch. (Required)
    - key: docker_secret
      # name: the name of the resulting data element in the k8s secret (Optional. Defaults to the credstash key)
      name: .dockerconfigjson
      # table: the dynamoDB table that contains the credstash secrets (Optional. Defaults to credential-store)
      table: credential-store
      # context: key value pairs to the encryption context (Optional)
      context:
        key1: value1
        key2: value2
  # type: the type of the resulting kubernetes secret (Optional. Defaults to Opaque)
  type: kubernetes.io/dockerconfigjson
```

## Deployment
### Prerequisites

The controller requires AWS credentials to be set before deploying it. This is accomplished by creating a secret with name `aws-credentials` in the controller namespace with the following keys:
* AWS_ACCESS_KEY_ID
* AWS_SECRET_ACCESS_KEY
* AWS_REGION

For example running the following will create an appropriate secret in the `credstash` namespace:
```
kubectl create secret generic aws-credentials --from-literal=AWS_ACCESS_KEY_ID=access_key --from-literal=AWS_SECRET_ACCESS_KEY=secret_access_key --from-literal=AWS_REGION=us-west-2 --namespace=credstash
```

The IAM policy required that will enable the operator to work is:
```
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": [
                "kms:Decrypt"
            ],
            "Effect": "Allow",
            "Resource": "${kms_key_arn}"
        },
        {
            "Action": [
                "dynamodb:GetItem",
                "dynamodb:Query",
                "dynamodb:Scan"
            ],
            "Effect": "Allow",
            "Resource": "${dynamodb_table_arn}"
        }
    ]
}
```
where:
* kms_key_arn is the KMS Key ARN used for credstash
* dynamodb_table_arn is the DynamoDb table ARN that the secrets are stored in

### Deploy the operator

Deploy the operator dependencies:
```
kubectl apply -f deploy/crds/credstash.ouzi.tech_credstashsecrets_crd.yaml
kubectl apply -f deploy/service_account.yaml -n credstash
kubectl apply -f deploy/role.yaml -n credstash
kubectl apply -f deploy/role_binding.yaml -n credstash
```

Deploy the operator:
```
kubectl apply -f deploy/deployment.yaml -n credstash
```

### Deploying via helm chart

#### Without existing credentials secret
```
helm upgrade --install credstash https://github.com/ouzi-dev/credstash-operator/releases/download/${VERSION}/credstash-operator-${VERSION}.tgz \
    -n credstash \
    --set awsCredentials.create=true \
    --set awsCredentials.awsAccessKeyId=access_key \
    --set awsCredentials.awsSecretAccessKey=secret_access_key \
    --set awsCredentials.awsRegion=region
```
Where ${VERSION} is the version you want to install
#### With existing credentials secret
```
helm upgrade --install credstash https://github.com/ouzi-dev/credstash-operator/releases/download/${VERSION}/credstash-operator-${VERSION}.tgz \
    -n credstash \
    --set awsCredentials.secretName=aws-credentials
``` 
Where ${VERSION} is the version you want to install

#### Using the Ouzi helm repo
```
helm repo add ouzi https://charts.ouzi.io
helm repo update
helm upgrade --install credstash ouzi/credstash-operator \
    --version ${VERSION}
    -n credstash \
    --set awsCredentials.secretName=aws-credentials
```
### Multi-Tenancy

The operator can monitor CRDs that have:
* a specific label with `operatorInstance=SOMETHING`
* are within a specific namespace
 
This allows you to have multiple instances of the operator running even within the same namespace.

A use case for that is that you wish to fetch secrets from different AWS Accounts within a specific namespace.

To do that, set the `operatorInstance` and `namespaceToWatch` fields in helm. 
The operator will only watch CredstashSecrets that have labels with `operatorInstance=SOMETHING` and are in the specific namespace specified.

**Note that if you deploy the operator without either `operatorInstance` or `namespaceToWatch` then it will process all CRDs.**

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