Standalone (no-dependencies beyond Python) script fetches SSH keys of GitHub repository contributors and generates SOPS-compatible SSH key files.
Project description
This script enables one to use github as a trusted public key distribution mechanism. SOPS enables git as a secret vault.
Why?
I needed github-to-sops to make SOPS easier to use for my https://deepstructure.io and https://chatcraft.org projects.
This 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.
Requirements
- Python3
- pip
- https://github.com/Mic92/ssh-to-age/ (until the SOPS ssh backend lands).
Installation
The latest version of github-to-sops can be cloned locally or installed using pip:
pip install github-to-sops
On Mac or Linux you can install sops, ssh-to-age using:
github-to-sops install-binaries
Implementation
This generates a nice .sops.yaml file with comments indicating where the keys came from to make key rotation easier.
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.
Env vars:
- GITHUB_TOKEN: optional github token which helps avoid rate limiting.
I tried to make the code work without github tokens, but github requires them for private repos and does aggressive rate-limiting without them. See github docs on how to obtain GITHUB_TOKEN https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/managing-your-personal-access-tokens
Example workflow for secrets with github
Import all public keys for contributors from 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:
- age19j4d6v9j7rx5fs629fu387qz4zmlpsqjexa4s08tkfrrmfdl5cwqjlaupd # humphd
- age13runq29jhy9kfpaegczrzttykerswh0qprq59msgd754yermtfmsa3hwg2 # tarasglek
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!
Decrypting secrets using ssh keys
export SOPS_AGE_KEY=$(ssh-to-age -private-key < ~/.ssh/id_ed25519)
Lets extract our secret in a way that's useful for automation
sops --extract '["secrets"]["SECRET_KEY"]' -d secrets.env.yaml
dontlook
sops -i secrets.env.yaml
is useful for interactive editing.
Bulk-updating secrets+keys when someone is added/removed from project
github-to-sops refresh-secrets
Usage:
./github-to-sops -h
usage: github-to-sops [-h] {import-keys,refresh-secrets} ...
Manage GitHub SSH keys and generate SOPS-compatible SSH key files.
options:
-h, --help show this help message and exit
Commands:
{import-keys,refresh-secrets}
import-keys Import SSH keys of GitHub repository contributors or specified github users and output that info into a useful format like sops or ssh authorized_keys
refresh-secrets Find all .sops.yaml files in the repo that are managed by git and run `import-keys --inplace-edit .sops.yaml` on them.
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 --known-hosts ~/.ssh/known_hosts --key-types ssh-ed25519`
- `./github-to-sops refresh-secrets`
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