GitHub Action — Decrypt Secrets

This GitHub Action (written in JavaScript) allows you to leverage GitHub Actions to decrypt secrets from a JSON file using gpg. For more information, see the "gpg manpage." Common workflows are:

• A central secrets repository
• Environment based secrets

Note: This currently does not support a JSON file that is more than one level deep.

Usage

Pre-requisites

Create a workflow .yml file in your .github/workflows directory. Example workflows are available below. For more information, reference the GitHub Help Documentation for Creating a workflow file.

Inputs

All of these inputs are required. For more information on these inputs, see the Workflow syntax for GitHub Actions

• secrets_file: The gpg file. For example, .github/workflows/secrets.json.gpg
• map: Describes the map between the environment variables and secret keys. For example, SECRET_PASSWORD=PASSWORD,PASSPHRASE=passphrase

Additionally, you must set the GPG_PASSPHRASE environment variable to decrypt the JSON file.

Outputs

None. The secrets are exported as environment variables through the map input. For more information, see the Environment variables documentation

Common workflows

On any workflow you will need to do the following:

1. Store your secrets in a JSON file. Warning: Do not commit this in your repository.
2. Encrypt your JSON file to gpg using a long alphanumeric passphrase. For example:

gpg --symmetric --cipher-algo AES256 secrets.json 

3. Place and commit the generated gpg file (e.g., secrets.json.gpg) in your repository. The recommended location is .github/workflows/secrets.json.gpg or .github/workflows/secrets/beta.json.gpg.

A central secrets repository

Instead of manually setting all of your secrets in GitHub's settings, you can simply store the passphrase you used when encrypting the JSON file using gpg. For example:

{
    "PASSWORD": "cSHS4mE&vDRJqKaPO&Fi{g@JCyv3|#Y><>Mp{8KP2m<#H0DL*F",
    "passphrase": "7heGrecgc<7oYLURMR%y6y#)fEl2zWF%j%PiL$E5s$za4PtxlC",
}

on: push

name: Continuous Integration

jobs:
  build:
    name: Example
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v2
      - name: Decrypt secrets
        uses: zgosalvez/github-actions-decrypt-secrets@v2
        with:
            secrets_file: .github/workflows/secrets.json.gpg
            map: 'SECRET_PASSWORD=PASSWORD,PASSPHRASE=passphrase'
        env:
            GPG_PASSPHRASE: ${{ secrets.SECRETS_PASSPHRASE }}
      - name: Test (Do not expose your actual secrets!)
        run: |
          echo $SECRET_PASSWORD
          echo $PASSPHRASE

Environment-based secrets

Another common scenario is when you need the same environment variable with a different value that depends on the environment. For example, you may have two JSON files: beta and production.

on:
  push:
    - beta
    - production

name: Continuous Deployment

jobs:
  build:
    name: Example
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v2
      - name: Determine environment
        id: determine_environment
        run: echo "::set-output name=environment::${GITHUB_REF#refs/heads/}"
      - name: Decrypt ${{ steps.determine_environment.outputs.environment }} secrets
        uses: zgosalvez/github-actions-decrypt-secrets@v2
        with:
            secrets_file: .github/workflows/secrets/${{ steps.determine_environment.outputs.environment }}.json.gpg
            map: 'SECRET_PASSWORD=PASSWORD,PASSPHRASE=passphrase'
        env:
            GPG_PASSPHRASE: ${{ secrets.SECRETS_PASSPHRASE }}
      - name: Test (Do not expose your actual secrets!)
        run: |
          echo $SECRET_PASSWORD
          echo $PASSPHRASE

License

The scripts and documentation in this project are released under the MIT License