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Extend tutorial section

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@ -244,14 +244,15 @@ e.g. inside your `flake.nix` file:
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";
@ -267,17 +268,32 @@ e.g. inside your `flake.nix` file:
"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 = {
@ -286,9 +302,22 @@ e.g. inside your `flake.nix` file:
};
}
```
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