Skip to content

home-manager: create a prototype module for user secret decryption #58

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
wants to merge 3 commits into from
Closed

home-manager: create a prototype module for user secret decryption #58

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
65e1a9a
home-manager: create a prototype module for user secret decryption
RaitoBezarius Sep 12, 2021
8926dcc
hm: cleanup root/non-root stuff for Home Manager module
RaitoBezarius Oct 10, 2021
1c11ad7
hm: remove sshAskpass
RaitoBezarius Oct 10, 2021
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
1 change: 1 addition & 0 deletions flake.nix
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@
in {

nixosModules.age = import ./modules/age.nix;
homeManagerModules.age = import ./modules/hm-age.nix;

overlay = import ./overlay.nix;

Expand Down
109 changes: 109 additions & 0 deletions modules/hm-age.nix
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,109 @@
{ config, options, lib, pkgs, ... }:

with lib;

let
cfg = config.age;

# we need at least rage 0.5.0 to support ssh keys
rage =
if lib.versionOlder pkgs.rage.version "0.5.0"
then pkgs.callPackage ../pkgs/rage.nix { }
else pkgs.rage;
ageBin = "${rage}/bin/rage";

identities = builtins.concatStringsSep " " (map (path: "-i ${path}") cfg.sshKeyPaths);

installSecret = secretType: ''
echo "decrypting ${secretType.file} to ${secretType.path}..."
TMP_FILE="${secretType.path}.tmp"
$DRY_RUN_CMD mkdir $VERBOSE_ARG -p $(dirname ${secretType.path})
(
$DRY_RUN_CMD umask u=r,g=,o=
$DRY_RUN_CMD ${ageBin} --decrypt ${identities} -o "$TMP_FILE" "${secretType.file}"
)
$DRY_RUN_CMD chmod $VERBOSE_ARG ${secretType.mode} "$TMP_FILE"
$DRY_RUN_CMD chown $VERBOSE_ARG ${secretType.owner}:${secretType.group} "$TMP_FILE"
$DRY_RUN_CMD mv $VERBOSE_ARG -f "$TMP_FILE" "${secretType.path}"
'';

installSecrets = builtins.concatStringsSep "\n" (["echo '[agenix] decrypting user secrets...'" ] ++ (map installSecret cfg.secrets));

secretType = types.submodule ({ config, ... }: {
options = {
name = mkOption {
type = types.str;
default = config._module.args.name;
description = ''
Name of the file used in /run/user/<uid>/secrets
'';
};
file = mkOption {
type = types.path;
description = ''
Age file the secret is loaded from.
'';
};
path = mkOption {
type = types.str;
default = "/run/user/$UID/secrets/${config.name}";
description = ''
Path where the decrypted secret is installed.
'';
};
mode = mkOption {
type = types.str;
default = "0400";
description = ''
Permissions mode of the in octal.
'';
};
owner = mkOption {
type = types.str;
default = "$UID";
description = ''
User of the file.
'';
};
group = mkOption {
type = types.str;
default = "$(id -g)";
description = ''
Group of the file.
'';
};
};
});
in
{
options.age = {
secrets = mkOption {
type = types.attrsOf secretType;
default = { };
description = ''
Attrset of secrets.
'';
};
sshKeyPaths = mkOption {
type = types.listOf types.path;
default = [];
#if config.services.openssh.enable then
# map (e: e.path) (lib.filter (e: e.type == "rsa" || e.type == "ed25519") config.services.openssh.hostKeys)
#else [ ];
description = ''
Path to SSH keys to be used as identities in age decryption.
'';
};
};
config = mkIf (cfg.secrets != { }) (mkMerge [

{
assertions = [{
assertion = cfg.sshKeyPaths != [ ];
message = "age.sshKeyPaths must be set.";
}];

home.activation.agenix = hm.dag.entryAfter [ "writeBoundary" ] installSecrets;
}
]);
}