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kustomize+age

This is a demo repository to demonstrate how we could encrypt data with age in a kustomization git repository and have kustomize decrypt them at build time.

The age.key file is here for the demo, in real life it SHOULD ABSOLUTELY NOT be checked in the repository otherwise all secrecy purposes would be defeated.

By default kustomize and age look for ssh keys to use as identities in ~/.ssh/id_rsa and ~/.ssh/id_ed25519. If those files exists kustomize will try to use them to decrypt data so you don't need to specify anything in ageIdentities if the data have been encrypted with one of these keys' public key.

Binaries

You'll find binaries of age with YAML support and kustomize with age support at https://github.com/sylr/kustomize-age/releases.

Pull requests

Kustomization

---
apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
configMapGenerator:
- name: myconfig
  files:
  - assets/config.yaml.age # reference to the encrypted yaml
  ageIdentities:
  - ./age.key

Example

Encrypt YAML with age

# assets/config.yaml will be crypted with 2 keys
$ age-darwin-amd64-d3cd2ad5 -R ~/.ssh/id_ed25519.pub -R ./age.pub -y assets/config.yaml | tee assets/config.yaml.age
this-is-a-config: hehehe
this-is-a-credential: !crypto/age:NoTag |-
  -----BEGIN AGE ENCRYPTED FILE-----
  YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IHNzaC1lZDI1NTE5IGYxc1ZMQSBlbTVY
  NFBhZmpOazZFN1VWdEwyVkRwME9ZT2NlOU5XTlZlcm1SY0JXZWdJCnJxZlZGQ05j
  b0NuWkpFTzNiNW5nVmNiVi9YWGdSc0dOd2xFNnRlMDNvQTgKLT4gWDI1NTE5IHRk
  L1ZwSDlmZzJzVm9CeFFrTWgzRnUrUTdqTjJUdXVITWRBZ09VRk14a2sKZVArMTRz
  amhUM0x4Q0RYMU55SmxJbW1aWkVubm94UHZhYklyUHZZZ3hUSQotLS0gbm5TejNm
  MGtHckg3VHBTa1ovbHp5dUtnMXdPU1NQTGxMTWJOZnJjc1VZZwpQJ4yennXD9GU5
  9RR9cIiTeQ7wr5eAQwTqoUcy2tTI7y9AykCzaA72Z06ruBrC+0gPeJrq2ZOFna4Y
  uAVOmxQG7p8i0hZWFFe2dHLz/r0=
  -----END AGE ENCRYPTED FILE-----
this-is-another-config: hahaha

Decrypt YAML with age

# assets/config.yaml.age is decrypted using ~/.ssh/id_ed25519
$ age-darwin-amd64-d3cd2ad5 -d -y assets/config.yaml.age
Enter passphrase for "/Users/sylr/.ssh/id_ed25519":
this-is-a-config: hehehe
this-is-a-credential: MyVerySecretPasswordWhichShouldNotBeClearInGit
this-is-another-config: hahaha

Kustomize build

$ kustomize-darwin-amd64-9cf05d72 build .
Enter passphrase for "/Users/s.rabot/.ssh/id_ed25519":
apiVersion: v1
data:
  config.yaml: |
    this-is-a-config: hehehe
    this-is-a-credential: MyVerySecretPasswordWhichShouldNotBeClearInGit
    this-is-another-config: hahaha
kind: ConfigMap
metadata:
  name: myconfig-f5m5dh6844

Re-key age encrypted file with a different set of keys

# assets/config.yaml.age is decrypted using ~/.ssh/id_ed25519 and then recrypted
# using only the ./age.pub key
$ age-darwin-amd64-d3cd2ad5 -d -y --yaml-discard-notag assets/config.yaml.age | \
    age-darwin-amd64-d3cd2ad5 -R ./age.pub -y
Enter passphrase for "/Users/sylr/.ssh/id_ed25519":
this-is-a-config: hehehe
this-is-a-credential: !crypto/age:NoTag |-
  -----BEGIN AGE ENCRYPTED FILE-----
  YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSAybVI4ZEl2eVIxUnNRU2w1
  N2xIdnhiWlVXR1hrcTlHRUI5d2d6ZVRwWlNzCjMzQzJFdGtQaUdwR3hUSUphOUhP
  TXFmaWJacVR4SFQrYXByREp4ay9WNEkKLS0tIERNWFRvLytzUUhEaTl3WThPTDVJ
  MTVwYmhqYzhsby9zZmY1b1hlSGJnR2MKd8nAjUkEovGVZoEtlBfe30H8zxeEY6Rd
  FUfgKGWqjX/Zr6eOAncTKDR6Oaoyeb4PBbvS0SoBfBcBh4sbozf8YHUIuwTvkFOZ
  fvaicZmG
  -----END AGE ENCRYPTED FILE-----
this-is-another-config: hahaha