使用加密金鑰解密 Kubernetes 秘密

Question

我有一個玩具 Kubernetes 集群，使用提供者啟用了靜態加密abs-256-cbc；我在這裡沒有使用任何保險庫來kms模擬問題。這意味著加密金鑰位於主節點上的純文字檔案中。

apiVersion: apiserver.config.k8s.io/v1
kind: EncryptionConfiguration
resources:
  - resources:
      - secrets
    providers:
      - aescbc:
          keys:
            - name: key1
              secret: c2VjcmV0IGlzIHNlY3VyZQ==
      - identity: {}

假設加密金鑰c2VjcmV0IGlzIHNlY3VyZQ==洩露，是否有機會解密儲存在etcd?

例子：

秘密創作：

k create secret generic secret1-no-encryption --from-literal foo="admin@123"
secret/secret1-no-encryption created

etcd從何時開始讀取秘密不是加密：

sudo ETCDCTL_API=3 etcdctl --endpoints https://192.168.122.191:2379 --cert=/etc/ssl/etcd/ssl/node-test-kube-controller-1.pem --key=/etc/ssl/etcd/ssl/node-test-kube-controller-1-key.pem --cacert=/etc/ssl/etcd/ssl/ca.pem get /registry/secrets/default/secret1-no-encryption
/registry/secrets/default/secret1-no-encryption
k8s

v1Secret▒
▒
secret1-no-encryptiondefault"*$3d45ddaa-2e34-4605-92d2-ad2ad31592692▒▒▒▒`
kubectl-createUpdatev▒▒▒FieldsV1:,
*{"f:data":{".":{},"f:foo":{}},"f:type":{}}B
foo     admin@123Opaque"

當 etcd 已加密時嘗試讀取機密：

sudo ETCDCTL_API=3 etcdctl --endpoints https://192.168.122.191:2379 --cert=/etc/ssl/etcd/ssl/node-test-kube-controller-1.pem --key=/etc/ssl/etcd/ssl/node-test-kube-controller-1-key.pem --cacert=/etc/ssl/etcd/ssl/ca.pem get /registry/secrets/default/secret2-with-encryption
/registry/secrets/default/secret2-with-encryption
k8s:enc:aescbc:v1:key1:n%-▒▒▒▒▒Ԩ▒qB▒x'V▒F▒y`l▒_X▒n
                                                  8#EEg▒!▒▒Mnk▒S▒▒KQ▒▒F▒NyJ▒$▒J▒▒Q`▒3m▒▒_▒▒U▒!7ZP▒bm▒x▒▒▒\▒{▒)e▒4▒Q-L▒#▒▒▒ձ▒<8▒▒ndd}Ҏ▒|1k▒▒>▒▒▒J▒R▒.▒▒c▒mɹ▒Q