Le dépôt des secrets | Guide Deuxfleurs

We use pass, 'the standard unix password manager', to manage our key store securely at Deuxfleurs. Getting access to our production involves publishing one's GPG key (through Gitea) and importing/verifying/signing every other sysadmin's key, before setting up pass. Lastly, you will be able to set your shell password on the desired cluster (prod or staging, at the time of writing).

Our process was adapted from this Medium article — thanks, David!

You are new and want to access the secrets repository

You need a GPG key to start with. If you do not already have one, you can generate a new one with:

gpg2 --expert --full-gen-key
# Personnaly I use `9) ECC and ECC`, `1) Curve 25519`, and `5y`
# Pour le nom, il vous identifie vous, vous pouvez l'utiliser pour signer des mails par exemple.

(Il se peut que vous n'ayez que la commande gpg sur votre PC parce qu'il est moderne. Faites gpg --version pour vérifier.)

In any case, you need to export your public key. Upload the output (public key) of the following command to your Gitea account.

gpg2 --export --armor <your email address>

It is now publicly accessible at https://git.deuxfleurs.fr/<your_gitea_username>.gpg

Inform the other sysadmins that you have published your key

Download the secrets repository:

mkdir -p ~/.password-store
cd ~/.password-store
git clone git@git.deuxfleurs.fr:Deuxfleurs/secrets.git deuxfleurs

Get the <hexa_of_your_gpg_key>, which you can get with gpg --list-keys --keyid-format 0xLONG . It's in the format 0x0123456789ABCDEF. Beware to take the key of your main key (line begins with pub, not with sub).

Add your key address to the Import keys section of the repo's README.md:

curl https://git.deuxfleurs.fr/<your_gitea_username>.gpg | gpg2 --import    # <hexa_of_your_gpg_key>

Also add your <hexa_of_your_gpg_key> to the .gpg-id file.
In your Gitea settings, ensure your User visibility is Public.

Now git commit/pull/push, and tell yo' friends that you're all set.

Import/verify/sign every other sysadmin's key into your keychain

You now need to import and sign every other sysadmin's GPG key. For example, import Quentin's key to your keychain as follow:

gpg2 --import <(curl https://git.deuxfleurs.fr/quentin.gpg)
gpg2 --list-keys
# pub   ed25519/0xE9602264D639FF68 2022-04-19 [SC] [expire : 2027-04-18]
#  Empreinte de la clef = 8023 E27D F1BB D52C 559B  054C E960 2264 D639 FF68
# uid                  [  ultime ] Quentin Dufour <quentin@deuxfleurs.fr>
# sub   cv25519/0xA40574404FF72851 2022-04-19 [E] [expire : 2027-04-18]

How to read this snippet:- the key id: E9602264D639FF68

the key fingerprint: 8023 E27D F1BB D52C 559B 054C E960 2264 D639 FF68

To perform the check, you need another communication channel (ideally physically, otherwise through the phone, Matrix if you already trusted the other person, or else). Compare the signature you read with the sysadmin's. If they match, you good.

Now that you have verified the key, sign it:

gpg --edit-key quentin@deuxfleurs.fr # by email
# or
gpg --edit-key E9602264D639FF68 # by key id
# gpg> lsign
# (say yes, maybe several times)
# gpg> save

Once you signed every sysadmin, ask an administrator to add your key to the secrets keystore. They will need to Add a sysadmin.

Once your fellow admin has finished their job, you are ready to install pass:

sudo apt-get install pass # Debian + Ubuntu
sudo yum install pass # Fedora + RHEL
sudo zypper in password-store # OpenSUSE
sudo emerge -av pass # Gentoo
sudo pacman -S pass # Arch Linux
brew install pass # macOS
pkg install password-store # FreeBSD

Go to passwordstore.org for more information about pass.

Finally check that everything works:

pass deuxfleurs/nix_priv_key

If you see an output of the form nix.web.deuxfleurs.fr:xxxxxx then it worked! You are now able to decrypt all the secrets. You can do the following command to list them:

pass show deuxfleurs

The next step is to setup SSH to be able to connect to computers of the clusters.

With great power comes great responsibility.

You are a sysadmin and want to operate the secrets repository

Initialise the pass store

These instructions are for bootstrapping the pass store. Don't do it on Deuxfleurs' secrets repository (don't be like ADRN). You would override the existing sysadmins and generally have a bad time.

Generate a new password store named deuxfleurs for you:

pass init -p deuxfleurs you@example.com

Add a password in this store, it will be encrypted with your gpg key:

pass generate deuxfleurs/backup_nextcloud 20
# or
pass insert deuxfleurs/backup_nextcloud

Add a sysadmin

Make sure that you trust the keys of your new sysadmin:

$ gpg --edit-key jane@example.com
gpg> lsign
gpg> y
gpg> save

Now re-encrypt the secrets and push your modifications:

pass init -p deuxfleurs $(cat ~/.password-store/deuxfleurs/.gpg-id)
cd ~/.password-store/deuxfleurs
git commit
git push

They will now be able to decrypt any password:

pass deuxfleurs/backup_nextcloud

To create the repo on bootstrap exclusively:

cd ~/.password-store/deuxfleurs
git init
git add .
git commit -m "Initial commit"
# Set up remote
git push

To retrieve the repo:

mkdir -p ~/.password-store
cd ~/.password-store
git clone https://git.example.com/org/repo.git deuxfleurs