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feat: add remote disk decryption over ssh

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Leon Schwarzäugl 2025-11-17 22:51:14 +01:00 • committed by Leon Schwarzäugl
parent 66a543abf7
commit 3391febda2
6 changed files with 162 additions and 64 deletions
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88
modules/nixos/server/disk-encrypt.nix
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@ -1,34 +1,80 @@
{ self, lib, config, globals, ... }:
{ self, pkgs, lib, config, globals, minimal, ... }:
let
localIp = globals.networks.home.hosts.${config.node.name}.ipv4;
subnetMask = globals.networks.home.subnetMask4;
gatewayIp = globals.hosts.${config.node.name}.defaultGateway4;
hostKeyPath = "/etc/secrets/initrd/ssh_host_ed25519_key";
in
{
options.swarselmodules.server.diskEncryption = lib.mkEnableOption "enable disk encryption config";
options.swarselsystems.networkKernelModules = lib.mkOption {
type = lib.types.listOf lib.types.str;
default = [ ];
};
config = lib.mkIf (config.swarselmodules.server.diskEncryption && config.swarselsystems.isCrypted) {
boot.kernelParams = lib.mkIf (!config.swarselsystems.isLaptop) [ "ip=${localIp}::${gatewayIp}:${subnetMask}:${config.networking.hostName}::none" ];
boot.initrd = {
availableKernelModules = [ "r8169" ];
network = {
enable = true;
udhcpc.enable = lib.mkIf config.swarselsystems.isLaptop true;
flushBeforeStage2 = true;
ssh = {
enable = true;
port = 22;
authorizedKeyFiles = [
(self + /secrets/keys/ssh/yubikey.pub)
(self + /secrets/keys/ssh/magicant.pub)
];
hostKeys = [ "/etc/secrets/initrd/ssh_host_ed25519_key" ];
};
postCommands = ''
echo 'cryptsetup-askpass || echo "Unlock was successful; exiting SSH session" && exit 1' >> /root/.profile
'';
};
system.activationScripts.ensureInitrdHostkey = lib.mkIf (config.swarselprofiles.server || minimal) {
text = ''
[[ -e ${hostKeyPath} ]] || ${pkgs.openssh}/bin/ssh-keygen -t ed25519 -N "" -f ${hostKeyPath}
'';
deps = [ "users" ];
};
environment.persistence."/persist" = lib.mkIf (config.swarselsystems.isImpermanence && (config.swarselprofiles.server || minimal)) {
files = [ hostKeyPath ];
};
boot = lib.mkIf (config.swarselprofiles.server || minimal) {
kernelParams = lib.mkIf (!config.swarselsystems.isLaptop) [
"ip=${localIp}::${gatewayIp}:${subnetMask}:${config.networking.hostName}::none"
];
initrd = {
availableKernelModules = config.swarselsystems.networkKernelModules;
network = {
enable = true;
udhcpc.enable = lib.mkIf config.swarselsystems.isLaptop true;
flushBeforeStage2 = true;
ssh = {
enable = true;
port = 2222; # avoid hostkey changed nag
authorizedKeyFiles = [
(self + /secrets/keys/ssh/yubikey.pub)
(self + /secrets/keys/ssh/magicant.pub)
];
hostKeys = [ hostKeyPath ];
};
# postCommands = ''
# echo 'cryptsetup-askpass || echo "Unlock was successful; exiting SSH session" && exit 1' >> /root/.profile
# '';
};
systemd = {
initrdBin = with pkgs; [
cryptsetup
];
services = {
unlock-luks = {
description = "Unlock LUKS encrypted root device";
wantedBy = [ "initrd.target" ];
after = [ "network-online.target" ];
before = [ "sysroot.mount" ];
path = [ "/bin" ];
# Configure how the service behaves
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
};
# The actual commands to unlock the drive
script = ''
echo "systemctl default >> /root/.profile"
'';
};
};
};
};
};
};
}