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|
{
description = "Manage local secrets for Nix configurations";
inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-20.09";
outputs = { self, nixpkgs }:
let
supportedSystems = [ "x86_64-linux" "i686-linux" "aarch64-linux" ];
forAllSystems = f: nixpkgs.lib.genAttrs supportedSystems (system: f system);
in {
nixosModules.localsecrets = import ./modules/localsecrets;
lib = rec {
writeSecret = { pkgs, name, secret }:
let
runtimeDirectory="secret-${name}";
in ''
systemd-run \
--wait \
-p DynamicUser=true \
-p RuntimeDirectory=${runtimeDirectory} \
-p RuntimeDirectoryMode=${secret.mode} \
-p RuntimeDirectoryPreserve=true \
-p WorkingDirectory=/run/${runtimeDirectory} \
-p PrivateTmp=true \
${pkgs.bash}/bin/bash -c '${secret.generator}'
rm -rf "${secret.privateDir}" || true
chown "${secret.user}:${secret.group}" "/run/${runtimeDirectory}/private"
chmod "${secret.mode}" "/run/${runtimeDirectory}/private"
mv "/run/${runtimeDirectory}/private" "${secret.privateDir}"
rm -rf "${secret.publicDir}" || true
mv "/run/${runtimeDirectory}/public" "${secret.publicDir}"
'';
writeSecrets = nixosConfiguration:
let
pkgs = nixosConfiguration.pkgs;
cfg = nixosConfiguration.config.localsecrets;
lib = pkgs.lib;
in pkgs.writeScriptBin "write-secrets" ''
umask 0022
mkdir -p /var/lib/${cfg.stateDir}/public
mkdir -p /var/lib/${cfg.stateDir}/private
${lib.concatStringsSep "\n" (lib.mapAttrsToList
(name: secret: writeSecret {
inherit pkgs name secret;
}) cfg.secrets)}
'';
makeSyncerPackages =
{ nixosConfigurations, sshAccessor }:
forAllSystems (system:
let
pkgs = import nixpkgs { inherit system; };
syncConfig = nixosConfiguration:
let
generator = writeSecrets nixosConfiguration;
in ''
nix copy -s --to ssh://${sshAccessor nixosConfiguration} ${generator}
ssh ${sshAccessor nixosConfiguration} ${generator}/bin/write-secrets
'';
in {
localsecrets-syncer = pkgs.writeScriptBin "localsecrets-syncer" ''
echo "Starting sync..."
${pkgs.lib.concatMapStrings syncConfig nixosConfigurations}
echo "Done"
'';
}
);
};
packages = self.lib.makeSyncerPackages {
nixosConfigurations = builtins.attrValues self.nixosConfigurations;
sshAccessor = nixosConfiguration:
let
host = nixosConfiguration.config.networking.hostName;
in "root@dragon.orbekk.com";
};
checks = forAllSystems (system: {
test =
let
testing = import (nixpkgs + "/nixos/lib/testing-python.nix") {
inherit system;
};
in
testing.makeTest {
nodes.client = { pkgs, lib, ... }: {
imports = [ self.nixosModules.localsecrets ];
localsecrets.enable = true;
localsecrets.secrets.test-secret = {
generator = pkgs.writeScript "test-secret.sh" ''
#! ${pkgs.bash}/bin/bash
PATH=${lib.makeBinPath (with pkgs; [ coreutils ])}
mkdir -p private public
echo hello > private/key.private
echo world > public/key.public
'';
};
};
testScript = ''
start_all()
client.wait_for_unit("multi-user.target")
private = "/var/lib/localsecrets/private/test-secret/key.private"
public = "/var/lib/localsecrets/public/test-secret/key.public"
client.succeed("grep hello {}".format(private))
client.fail("sudo -u nobody cat {}".format(private))
client.succeed("grep world {}".format(public))
client.succeed("sudo -u nobody cat {}".format(public))
'';
};
});
nixosConfigurations.container =
nixpkgs.lib.nixosSystem {
system = "x86_64-linux";
modules = [
self.nixosModules.localsecrets
({lib, pkgs, ...}:
{
localsecrets.secrets.test-secret = {
generator = pkgs.writeScript "test-secret.sh" ''
#! ${pkgs.bash}/bin/bash
PATH=${lib.makeBinPath (with pkgs; [ coreutils ])}
mkdir -p private public
echo hello > private/key.private
echo world > public/key.public
'';
};
boot.isContainer = true;
}
)
];
};
};
}
|
