Adds per volume encryption with Vault integration

- adds proposal document for PVC encryption from PR448
- adds per-volume encription by generating encryption passphrase
  for each volume and storing it in a KMS
- adds HashiCorp Vault integration as a KMS for encryption passphrases
- avoids encrypting volume second time if it was already encrypted but
  no file system created
- avoids unnecessary checks if volume is a mapped device when encryption
  was not requested
- prevents resizing encrypted volumes (it is not currently supported)
- prevents creating snapshots from encrypted volumes to prevent attack
  on encryption key (security guard until re-encryption of volumes
  implemented)

Signed-off-by: Vasyl Purchel vasyl.purchel@workday.com
Signed-off-by: Andrea Baglioni andrea.baglioni@workday.com

Fixes #420
Fixes #744

charts/ceph-csi-rbd/templates/encryptionkms-configmap.yaml

@@ -0,0 +1,14 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ .Values.kmsConfigMapName | quote }}
+  namespace: {{ .Release.Namespace }}
+  labels:
+    app: {{ include "ceph-csi-rbd.name" . }}
+    chart: {{ include "ceph-csi-rbd.chart" . }}
+    component: {{ .Values.nodeplugin.name }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
+data:
+  config.json: |-
+{{ toJson .Values.encryptionKMSConfig | indent 4 -}}

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

@@ -121,6 +121,8 @@ spec:
               readOnly: true
             - name: ceph-csi-config
               mountPath: /etc/ceph-csi-config/
+            - name: ceph-csi-encryption-kms-config
+              mountPath: /etc/ceph-csi-encryption-kms-config/
             - name: plugin-dir
               mountPath: /var/lib/kubelet/plugins
               mountPropagation: "Bidirectional"
@@ -189,6 +191,9 @@ spec:
         - name: ceph-csi-config
           configMap:
             name: {{ .Values.configMapName | quote }}
+        - name: ceph-csi-encryption-kms-config
+          configMap:
+            name: {{ .Values.kmsConfigMapName | quote }}
         - name: keys-tmp-dir
           emptyDir: {
             medium: "Memory"

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

@@ -148,6 +148,8 @@ spec:
               readOnly: true
             - name: ceph-csi-config
               mountPath: /etc/ceph-csi-config/
+            - name: ceph-csi-encryption-kms-config
+              mountPath: /etc/ceph-csi-encryption-kms-config/
             - name: keys-tmp-dir
               mountPath: /tmp/csi/keys
           resources:
@@ -193,6 +195,9 @@ spec:
         - name: ceph-csi-config
           configMap:
             name: {{ .Values.configMapName | quote }}
+        - name: ceph-csi-encryption-kms-config
+          configMap:
+            name: {{ .Values.kmsConfigMapName | quote }}
         - name: keys-tmp-dir
           emptyDir: {
             medium: "Memory"