kustomize-sopssecretgenerator

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kustomize-sopssecretgenerator

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Kustomize generator plugin that generates Secrets from sops-encrypted files

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# kustomize-sopssecretgenerator

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SecretGenerator ❤ sops

## Why use this?

[Kustomize](https://github.com/kubernetes-sigs/kustomize) is a great tool for implementing a [GitOps](https://www.weave.works/blog/gitops-operations-by-pull-request) workflow. When a repository describes the entire system state, it often contains secrets that need to be encrypted at rest. Mozilla's [sops](https://github.com/mozilla/sops) is a simple and flexible tool that is very suitable for that task.

This Kustomize plugin allows you to create Secrets transparently from sops-encrypted files during resource generation. It is explicitly modeled after the builtin [SecretGenerator](https://github.com/kubernetes-sigs/kustomize/blob/master/docs/plugins/builtins.md#secretgenerator) plugin. Because it is an exec plugin, it is not tied to the specific compilation of Kustomize, [like Go plugins are](https://github.com/kubernetes-sigs/kustomize/blob/master/docs/plugins/goPluginCaveats.md).

Since version 1.5.0, the plugin can be used as a [KRM Function](https://github.com/kubernetes-sigs/kustomize/blob/master/cmd/config/docs/api-conventions/functions-spec.md).

Credit goes to [Seth Pollack](https://github.com/sethpollack) for the [Kustomize Secret Generator Plugins KEP](https://github.com/kubernetes/enhancements/blob/master/keps/sig-cli/kustomize-secret-generator-plugins.md) and subsequent implementation that made this possible.

## Installation

SopsSecretGenerator is available as a binary, or as a Docker image.

### Binary

Download the `SopsSecretGenerator` binary for your platform from the [GitHub releases page](https://github.com/goabout/kustomize-sopssecretgenerator/releases) and make it executable.

For example, to install version 1.6.0 on Linux:
```bash
VERSION=1.6.0 PLATFORM=linux ARCH=amd64
curl -Lo SopsSecretGenerator "https://github.com/goabout/kustomize-sopssecretgenerator/releases/download/v${VERSION}/SopsSecretGenerator_${VERSION}_${PLATFORM}_${ARCH}"
chmod +x SopsSecretGenerator
```

You do not need to install the `sops` binary for the plugin to work. The plugin includes and calls sops internally.

### Docker image

See the [goabout/kustomize-sopssecretgenerator](https://hub.docker.com/repository/docker/goabout/kustomize-sopssecretgenerator) image at Docker Hub.

## Usage

Create some encrypted values using `sops`:
```bash
echo FOO=secret >secret-vars.env
sops -e -i secret-vars.env

echo secret >secret-file.txt
sops -e -i secret-file.txt
```

### Exec KRM Function

Although the generator can run in a Docker container, any real usage requires to access to local resources such as the filesystem or a PGP socket. This example calls the binary directly.

Add a generator to your kustomization:
```bash
cat <<. >kustomization.yaml
generators:
  - generator.yaml
.

cat <<. >generator.yaml
apiVersion: goabout.com/v1beta1
kind: SopsSecretGenerator
metadata:
  annotations:
   config.kubernetes.io/function: |
      exec:
        path: ./SopsSecretGenerator
  name: my-secret
envs:
  - secret-vars.env
files:
  - secret-file.txt
.
```

(Change the path to the `SopsSecretGenerator` binary to suit your installation. Kustomize will use the binary search path, `$PATH`, if you use a bare command.)

Run `kustomize build` with the `--enable-alpha-plugins` and `--enable-exec` flags:

```bash
kustomize build --enable-alpha-plugins --enable-exec
```
    
The output is a Kubernetes secret containing the decrypted data:
```yaml
apiVersion: v1
data:
  FOO: J3NlY3JldCc=
  secret-file.txt: c2VjcmV0Cg==
kind: Secret
metadata:
  name: my-secret-6d2fchb89d
```

### Legacy Plugin

First, install the plugin to `$XDG_CONFIG_HOME`: (By default, `$XDG_CONFIG_HOME` points to `$HOME/.config` on Linux and OS X, and `%LOCALAPPDATA%` on Windows.)
```bash
mkdir -p "${XDG_CONFIG_HOME:-$HOME/.config}/kustomize/plugin/goabout.com/v1beta1/sopssecretgenerator"
mv SopsSecretGenerator "${XDG_CONFIG_HOME:-$HOME/.config}/kustomize/plugin/goabout.com/v1beta1/sopssecretgenerator"
```

Add a generator to your kustomization:
```bash
cat <<. >kustomization.yaml
generators:
  - generator.yaml
.

cat <<. >generator.yaml
apiVersion: goabout.com/v1beta1
kind: SopsSecretGenerator
metadata:
  name: my-secret
envs:
  - secret-vars.env
files:
  - secret-file.txt
.
```

### Generator Options

Like SecretGenerator, SopsSecretGenerator supports the [generatorOptions](https://kubernetes-sigs.github.io/kustomize/api-reference/kustomization/generatoroptions/) fields. Additionally, labels and annotations are copied over to the Secret. Data key-values ("envs") can be read from dotenv, INI, YAML and JSON files. If the data is a file and the Secret data key needs to be different from the filename, you can specify the key by adding `desiredKey=filename` instead of just the filename.

An example showing all options:

apiVersion: goabout.com/v1beta1
    kind: SopsSecretGenerator
    metadata:
      name: my-secret
      labels:
        app: my-app
      annotations:
        create-by: me
    behavior: create
    disableNameSuffixHash: true
    envs:
      - secret-vars.env
      - secret-vars.ini
      - secret-vars.yaml
      - secret-vars.json
    files:
      - secret-file1.txt
      - secret-file2.txt=secret-file2.sops.txt
    type: Opaque

## Using SopsSecretsGenerator with ArgoCD

SopsSecretGenerator can be added to ArgoCD by [patching](./docs/argocd.md) an initContainer into the ArgoCD provided `install.yaml`.

## Alternatives

There are a number of other plugins that can serve the same function:

* [viaduct-ai/kustomize-sops](https://github.com/viaduct-ai/kustomize-sops)
* [Agilicus/kustomize-sops](https://github.com/Agilicus/kustomize-sops)
* [barlik/kustomize-sops](https://github.com/barlik/kustomize-sops)
* [monopole/sopsencodedsecrets](https://github.com/monopole/sopsencodedsecrets)
* [omninonsense/kustomize-sopsgenerator](https://github.com/omninonsense/kustomize-sopsgenerator)
* [whatever-company/secretgen](https://github.com/whatever-company/secretgen)

Additionally, there are other ways to use sops-encrypted secrets in Kubernetes:

* [isindir/sops-secrets-operator](https://github.com/isindir/sops-secrets-operator)
* [craftypath/sops-operator](https://github.com/craftypath/sops-operator)
* [jkroepke/helm-secrets](https://github.com/jkroepke/helm-secrets)
* [dschniepp/sealit](https://github.com/dschniepp/sealit)

Most of these projects are in constant development. I invite you to check them out and pick the project that best fits your goals.

## Development

You will need [Go](https://golang.org) 1.17 or higher to develop and build the plugin.

### Test

Run all tests:

make test

In order to create encrypted test data, you need to import the secret key from `testdata/keyring.gpg` into your GPG keyring once:

cd testdata
    gpg --import keyring.gpg
    
You can then use `sops` to create encrypted files:

sops -e -i newfile.txt

### Build

Create a binary for your system:

make
    
The resulting executable will be named `SopsSecretGenerator`.

### Release

This project uses GitHub Actions and [goreleaser](https://goreleaser.com) to publish releases on GitHub.

First, don't forget to update the documentation for the new version you are going to release.

Then create a Git tag for the release:

VERSION=X.X.X
    git tag -a v$VERSION -m "Version $VERSION"

And push it to GitHub:

git push

The GitHub Actions workflow will build and release the binaries automatically.

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