rbd: add aws-sts-metdata encryption type

With Amazon STS and kubernetes cluster is configured with
OIDC identity provider, credentials to access Amazon KMS
can be fetched using oidc-token(serviceaccount token).
Each tenant/namespace needs to create a secret with aws region,
role and CMK ARN.
Ceph-CSI will assume the given role with oidc token and access
aws KMS, with given CMK to encrypt/decrypt DEK which will stored
in the image metdata.

Refer: https://docs.aws.amazon.com/STS/latest/APIReference/welcome.html
Resolves: #2879

Signed-off-by: Rakshith R <rar@redhat.com>

charts/ceph-csi-rbd/templates/nodeplugin-daemonset.yaml

@@ -133,6 +133,9 @@ spec:
               mountPath: /tmp/csi/keys
             - name: ceph-logdir
               mountPath: /var/log/ceph
+            - name: oidc-token
+              mountPath: /var/run/secrets/tokens
+              readOnly: true
           resources:
 {{ toYaml .Values.nodeplugin.plugin.resources | indent 12 }}
 {{- if .Values.nodeplugin.httpMetrics.enabled }}
@@ -221,6 +224,13 @@ spec:
           emptyDir: {
             medium: "Memory"
           }
+        - name: oidc-token
+          projected:
+            sources:
+              - serviceAccountToken:
+                  path: oidc-token
+                  expirationSeconds: 3600
+                  audience: ceph-csi-kms
 {{- if .Values.nodeplugin.affinity }}
       affinity:
 {{ toYaml .Values.nodeplugin.affinity | indent 8 -}}

charts/ceph-csi-rbd/templates/provisioner-deployment.yaml

@@ -183,6 +183,9 @@ spec:
               mountPath: /etc/ceph-csi-encryption-kms-config/
             - name: keys-tmp-dir
               mountPath: /tmp/csi/keys
+            - name: oidc-token
+              mountPath: /var/run/secrets/tokens
+              readOnly: true
           resources:
 {{ toYaml .Values.nodeplugin.plugin.resources | indent 12 }}
 {{- if .Values.provisioner.deployController }}
@@ -271,6 +274,13 @@ spec:
           emptyDir: {
             medium: "Memory"
           }
+        - name: oidc-token
+          projected:
+            sources:
+              - serviceAccountToken:
+                  path: oidc-token
+                  expirationSeconds: 3600
+                  audience: ceph-csi-kms
 {{- if .Values.provisioner.affinity }}
       affinity:
 {{ toYaml .Values.provisioner.affinity | indent 8 -}}