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Merge pull request #192 from malteneuss/extend_documentation 

Extend documentation to make it more NixOS beginner friendly.
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@ -1,6 +1,14 @@
# agenix - [age](https://github.com/FiloSottile/age)-encrypted secrets for NixOS
`agenix` is a commandline tool for managing secrets encrypted with your existing SSH keys. This project also includes the NixOS module `age` for adding encrypted secrets into the Nix store and decrypting them.
`agenix` is a small and convenient Nix library for securely managing and deploying secrets using common public-private SSH key pairs:
You can encrypt a secret (password, access-token, etc.) on a source machine using a number of public SSH keys,
and deploy that encrypted secret to any another target machine that has the corresponding private SSH key of one of those public keys.
This project contains two parts:
1. An `agenix` commandline app (CLI) to encrypt secrets into secured `.age` files that can be copied into the Nix store.
2. An `agenix` NixOS module to conveniently
* add those encrypted secrets (`.age` files) into the Nix store so that they can be deployed like any other Nix package using `nixos-rebuild` or similar tools.
* automatically decrypt on a target machine using the private SSH keys on that machine
* automatically mount these decrypted secrets on a well known path like `/run/agenix/...` to be consumed.
## Contents
@ -191,13 +199,14 @@ To install the `agenix` binary:
#### Install CLI via Flakes
You don't need to install it,
You can run the CLI tool ad-hoc without installing it:
```ShellSession
nix run github:ryantm/agenix -- --help
```
but, if you want to (change the system based on your system):
But you can also add it permanently into a [NixOS module](https://nixos.wiki/wiki/NixOS_modules)
(replace system "x86_64-linux" with your system):
```nix
{
@ -205,6 +214,28 @@ but, if you want to (change the system based on your system):
}
```
e.g. inside your `flake.nix` file:
```nix
{
inputs.agenix.url = "github:ryantm/agenix";
# ...
outputs = { self, nixpkgs, agenix }: {
# change `yourhostname` to your actual hostname
nixosConfigurations.yourhostname = nixpkgs.lib.nixosSystem {
system = "x86_64-linux";
modules = [
# ...
{
environment.systemPackages = [ agenix.packages.${system}.default ];
}
];
};
};
}
```
</details>
## Tutorial
@ -213,14 +244,15 @@ but, if you want to (change the system based on your system):
have `sshd` running on it so that it has generated SSH host keys in
`/etc/ssh/`.
2. Make a directory to store secrets and `secrets.nix` file for listing secrets and their public keys (This file is **not** imported into your NixOS configuration. It is only used for the `agenix` CLI.):
2. Make a directory to store secrets and `secrets.nix` file for listing secrets and their public keys:
```ShellSession
$ mkdir secrets
$ cd secrets
$ touch secrets.nix
```
3. Add public keys to `secrets.nix` file (hint: use `ssh-keyscan` or GitHub (for example, https://github.com/ryantm.keys)):
This `secrets.nix` file is **not** imported into your NixOS configuration.
It's only used for the `agenix` CLI tool (example below) to know which public keys to use for encryption.
3. Add public keys to your `secrets.nix` file:
```nix
let
user1 = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIL0idNvgGiucWgup/mP78zyC23uFjYq0evcWdjGQUaBH";
@ -236,17 +268,32 @@ but, if you want to (change the system based on your system):
"secret2.age".publicKeys = users ++ systems;
}
```
4. Edit secret files (these instructions assume your SSH private key is in ~/.ssh/):
These are the users and systems that will be able to decrypt the `.age` files later with their corresponding private keys.
You can obtain the public keys from
* your local computer usually in `~/.ssh`, e.g. `~/.ssh/id_ed25519.pub`.
* from a running target machine with `ssh-keyscan`:
```ShellSession
$ ssh-keyscan <user>@<ip-address>
... ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIKzxQgondgEYcLpcPdJLrTdNgZ2gznOHCAxMdaceTUT1
...
```
* from GitHub like https://github.com/ryantm.keys.
4. Create a secret file:
```ShellSession
$ agenix -e secret1.age
```
It will open a temporary file in the app configured in your $EDITOR environment variable.
When you save that file its content will be encrypted with all the public keys mentioned in the `secrets.nix` file.
5. Add secret to a NixOS module config:
```nix
{
age.secrets.secret1.file = ../secrets/secret1.age;
}
```
6. Use the secret in your config:
When the `age.secrets` attribute set contains a secret, the `agenix` NixOS module will later automatically decrypt and mount that secret under the default path `/run/agenix/secret1`.
Here the `secret1.age` file becomes part of your NixOS deployment, i.e. moves into the Nix store.
6. Reference the secrets' mount path in your config:
```nix
{
users.users.user1 = {
@ -255,9 +302,22 @@ but, if you want to (change the system based on your system):
};
}
```
7. NixOS rebuild or use your deployment tool like usual.
You can reference the mount path to the (later) unencrypted secret already in your other configuration.
So `config.age.secrets.secret1.path` will contain the path `/run/agenix/secret1` by default.
7. Use `nixos-rebuild` or [another deployment tool](https://nixos.wiki/wiki/Applications#Deployment") of choice as usual.
The secret will be decrypted to the value of `config.age.secrets.secret1.path` (`/run/agenix/secret1` by default).
The `secret1.age` file will be copied over to the target machine like any other Nix package.
Then it will be decrypted and mounted as described before.
8. Edit secret files:
```ShellSession
$ agenix -e secret1.age
```
It assumes your SSH private key is in `~/.ssh/`.
In order to decrypt and open a `.age` file for editing you need the private key of one of the public keys
it was encrypted with. You can pass the private key you want to use explicitly with `-i`, e.g.
```ShellSession
$ agenix -e secret1.age -i ~/.ssh/id_ed25519
```
## Reference