github-to-sops 3.1.1

Standalone script fetches SSH keys of GitHub repository collaborators or specified users and generates SOPS-compatible SSH key files.

github-to-sops integrates SOPS for secret management with github team/user identities. Use sops + github instead of having to operate Hashicorp Vault, AWS Secret Manager or click-managing github action secrets or fighting with GPG.

Why?

I think SOPS is the simplest way to manage secrets for team and individual projects, especially when combined with github as a key distribution mechanism.

This script makes it easy to setup SOPS as a lightweight gitops alternative to AWS Secrets Manager, AWS KMS, Hashicorp Vault.

SOPS is helpful to avoid the push-and-pray (https://dagger.io/ came up with this term and solution for it) pattern where all secrets for github actions are stored in Github Secrets such that nobody can repro stuff locally. With sops one can give github actions a single age private key and share all the development keys with rest of team on equal footing with CI/CD env.

Even though this github-to-sops implementation focuses on github it should be considered as part of a wider secrets-as-code (secrets-in-git + ssh&age) design pattern. It can be generalized for managing encrypted secrets in databases, hosting providers, logs, etc.

Requirements

• sops
• GitHub CLI (gh) for repository collaborator lookup and for the install helper. Run gh auth login before using repository-based imports. If you pass recipients explicitly with --github-users, gh is not required for key import, but it is required for github-to-sops install.
• Python3
• pip

Installation

This tool has two parts that need to be installed: github-to-sops itself, and sops.

Step 1: Install github-to-sops

The preferred way to install github-to-sops is with uv, a fast Python package installer:

uv pip install github-to-sops

As an alternative to installing, uv can also run github-to-sops directly. For example:

uv run github-to-sops -- import-keys > .sops.yaml

Step 2: Install sops

After installing github-to-sops, you need to install sops.

On Mac or Linux, github-to-sops provides a helper command to install sops for you:

github-to-sops install

The install helper uses gh release download to fetch sops release assets from getsops/sops, verifies the binary against the upstream SHA256 checksums file, and then installs it to /usr/local/bin/sops.

For other platforms or for manual installation, please see the official sops installation guide.

Development Setup

For development on a local checkout, use uv to create a virtual environment and install in editable mode. This avoids externally-managed-environment errors on modern OSes.

Create and activate a virtual environment:

uv venv
source .venv/bin/activate

Then install in editable mode:

uv pip install -e .

Alternative: pip Installation

If you prefer not to use uv, you can install github-to-sops using pip:

pip install github-to-sops

Implementation

github-to-sops generates and maintains .sops.yaml file with comments indicating where the keys came from. Has updatekeys command to pull new secrets and re-encrypt files.

Idea for this originated in https://github.com/tarasglek/chatcraft.org/pull/319 after I got sick of devising a secure secret distribution scheme for every small project.

Contributions Welcome

• Tests
• Binary build for python-less environments
• Would be nice to add is ACLs and an integrity check to keys being used.

Examples:

I wrote an indepth explanation and screencasts on my blog post introducing github-to-sops.

GitHub authentication

github-to-sops uses GitHub collaborators for repository-based imports. It does not use GitHub contributors as secret recipients, because commit authors are not necessarily current trusted repository members.

For repository-based imports, install GitHub CLI and authenticate:

gh auth login

Alternatively, bypass repository lookup and pass explicit users:

github-to-sops --github-users alice,bob import-keys

Example workflow for secrets with github

Import all public keys for collaborators from an existing github project

github-to-sops import-keys  > .sops.yaml

of if your repo isn't published to github or you aren't working inside a git checkout

github-to-sops import-keys  --github-url https://github.com/tarasglek/chatcraft.org

lets see

cat .sops.yaml

creation_rules:
  - key_groups:
      - age:
        # Generated by `github-to-sops import-keys` https://github.com/tarasglek/github-to-sops
        - ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIG... user1@host # user1
        - ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQ... user2@host # user2

Put a sample secret in yaml

echo -e "secrets:\n  SECRET_KEY: dontlook" | sops --input-type yaml --output-type yaml  -e /dev/stdin > secrets.enc.yaml

Lets take a peek

head -n 9 secrets.enc.yaml

secrets:
    SECRET_KEY: ENC[AES256_GCM,data:MKKR6B0h1iA=,iv:KegjC62NQxich1dtodVF3aVnchf/fB+KQbtETh+4CaY=,tag:2+5mk4YMKKxLqaCOpZVNSA==,type:str]
sops:
    kms: []
    gcp_kms: []
    azure_kv: []
    hc_vault: []
    age:
        - recipient: age19j4d6v9j7rx5fs629fu387qz4zmlpsqjexa4s08tkfrrmfdl5cwqjlaupd

^ is safe to commit!

sops -i secrets.enc.yaml is useful for interactive editing.

Bulk-updating secrets+keys when someone is added/removed from project

The updatekeys command pulls updated public keys for all team members from GitHub, updates all .sops.yaml files, and then refreshes all *.enc.yaml, *.enc.json, and *.enc.env files with the new keys. This is useful when a team member is added to or removed from the project, or when a team member adds or removes keys.

github-to-sops updatekeys

Usage:

github-to-sops -h
usage: github-to-sops [-h] [--version] [--github-users GITHUB_USERS]
                      {install,updatekeys,import-keys} ...

Manage GitHub SSH keys and generate SOPS-compatible SSH key files.

options:
  -h, --help            show this help message and exit
  --version             show program's version number and exit
  --github-users GITHUB_USERS
                        Comma-separated list of GitHub usernames to fetch keys
                        for. This is a global option that can be used with
                        import-keys and updatekeys.

Commands:
  {install,updatekeys,import-keys}
    install             Install sops binary for supported platforms (Linux and
                        Mac).
    updatekeys          Update team keys and re-encrypt all .sops.yaml and
                        *.enc.{json,yaml,env} files.
    import-keys         Import SSH keys of GitHub repository collaborators or
                        specified github users and output that info into a
                        useful format like sops or ssh authorized_keys

Example invocations:
- `github-to-sops import-keys --github-url https://github.com/tarasglek/chatcraft.org --key-types ssh-ed25519 --format sops`
- `github-to-sops import-keys --github-url https://github.com/tarasglek/chatcraft.org --format authorized_keys`
- `github-to-sops import-keys --local-github-checkout . --format sops --key-types ssh-ed25519`
- `github-to-sops updatekeys`