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configure-3rdparty-repos-access.md

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Configure Access to 3rd Party Chart Repositories in Openshift Console.

Default Chart Repository

Openshift console by default lists Helm charts from RedHat Helm chart repository.

Replace Default with 3rd-party Repository

Instances of HelmChartRepository CRD capture the details required for accessing a Helm chart repository.

Basic structure of HelmChartRepository CR

apiVersion: helm.openshift.io/v1beta1
kind: HelmChartRepository
metadata:
  name: NAME
spec:
 # optional name that might be used by console
 # name: CHART_DISPLAY_NAME
  connectionConfig:
    url: HELM_CHART_REPO_URL

Add Azure Sample Chart Repository

$ cat <<EOF | kubectl apply -f -
apiVersion: helm.openshift.io/v1beta1
kind: HelmChartRepository
metadata:
  name: azure-sample-repo
spec:
  connectionConfig:
    url: https://raw.githubusercontent.com/Azure-Samples/helm-charts/master/docs
EOF

Configure CA certificates

If accessing chart repository requires usage of a custom CA certificate, its content (PEM encoded) needs be stored under key ca-bundle.crt within the configmap in openshift-config namespace. The configmap name is referred in spec.connectionConfig.ca.name field.

spec:
  connectionConfig:
    url: https://my-private-repo.foo.local
    ca:
      name: helm-ca-cert

Configmaps can be added through UI:

or from CLI:

kubectl create configmap helm-ca-cert \
  --from-file=ca-bundle.crt=/path/to/certs/ca.crt \
  -n openshift-config

Configure Client TLS Configurations

Similarly, client certificate and key can be provided for cases when the repo requires them. These should be in pem encoded format and stored under key tls.crt and tls.key respectively, within a secret in openshift-config namespace. The secret name is referred in spec.connectionConfig.tlsClientConfig.name field.

spec:
  connectionConfig:
    url: https://my-private-repo.foo.local
    tlsClientConfig:
      name: helm-tls-configs

Secrets can be added through UI:

or from CLI:

kubectl create secret generic helm-tls-configs \
  --from-file=tls.crt=/path/to/certs/client.crt \
  --from-file=tls.key=/path/to/certs//client.key \
  -n openshift-config

Disable Helm chart repository

We can disable listing helm charts in the catalog by adding disabled flag.

spec:
  connectionConfig:
    url: https://my-private-repo.foo.local
  disabled: true

By adding disabled flag in the CR, we are disabling helm chart listing from https://my-private-repo.foo.local repository.

Multiple Chart Repository Support

Adding multiple instances of HelmChartRepository is supported. As the result, /api/helm/charts/index.yaml endpoint returns combined chart list, containing charts from all accessible repositories.

Access Control

When requesting repo index through /api/helm/charts/index.yaml endpoint, HelmChartRepository CRs and corresponding configmaps and secrets are read on behalf of logged UI user. By default, only admins have proper rights. Without that, users see only charts from the default repo. Admins might allow others to browse configured repo by adding appropriate roles to the cluster.

Example: allow all regular users to browse repos:

$ cat <<EOF | kubectl apply -f -
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: helm-chartrepos-viewer
rules:
  - verbs:
      - get
      - list
    apiGroups:
      - helm.openshift.io
    resources:
      - helmchartrepositories
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: helm-chartrepos-view
subjects:
  - kind: Group
    apiGroup: rbac.authorization.k8s.io
    name: 'system:authenticated'
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: helm-chartrepos-viewer
EOF

In case when certificates are needed, additional appropriate roles must be added in openshift-config namespace.

Following the previous example, regular users need to get read access to helm-ca-cert configmap and helm-tls-configs secret.

$ cat << EOF | kubectl apply -f -
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  namespace: openshift-config
  name: helm-chartrepos-tls-conf-viewer
rules:
- apiGroups: [""]
  resources: ["configmaps"]
  resourceNames: ["helm-ca-cert"]
  verbs: ["get"]
- apiGroups: [""]
  resources: ["secrets"]
  resourceNames: ["helm-tls-configs"]
  verbs: ["get"]
---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  namespace: openshift-config
  name: helm-chartrepos-tls-conf-viewer
subjects:
  - kind: Group
    apiGroup: rbac.authorization.k8s.io
    name: 'system:authenticated'
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: helm-chartrepos-tls-conf-viewer
EOF

Applying carefully crafted roles, an admin can really fine tune access to declared repos, even achieve different views for appropriate user groups, etc.