100 lines
2.9 KiB
Nix
100 lines
2.9 KiB
Nix
{ config, pkgs, lib, ... }:
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let
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cfg = config.remoteLuksUnlock;
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in
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{
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options.remoteLuksUnlock = {
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enable = lib.mkEnableOption "enable luks root remote decrypt over ssh/tor";
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enableTorUnlock = lib.mkOption {
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type = lib.types.bool;
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default = cfg.enable;
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description = "Make machine accessable over tor for ssh boot unlock";
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};
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sshHostKeys = lib.mkOption {
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type = lib.types.listOf (lib.types.either lib.types.str lib.types.path);
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default = [
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"/secret/ssh_host_rsa_key"
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"/secret/ssh_host_ed25519_key"
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];
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};
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sshAuthorizedKeys = lib.mkOption {
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type = lib.types.listOf lib.types.str;
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default = config.users.users.googlebot.openssh.authorizedKeys.keys;
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};
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onionConfig = lib.mkOption {
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type = lib.types.path;
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default = /secret/onion;
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};
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kernelModules = lib.mkOption {
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type = lib.types.listOf lib.types.str;
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default = [ "e1000" "e1000e" "virtio_pci" "r8169" ];
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};
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};
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config = lib.mkIf cfg.enable {
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# boot.initrd.luks.devices.${cfg.device.name} = {
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# device = cfg.device.path;
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# allowDiscards = cfg.device.allowDiscards;
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# };
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# Unlock LUKS disk over ssh
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boot.initrd.network.enable = true;
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boot.initrd.kernelModules = cfg.kernelModules;
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boot.initrd.network.ssh = {
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enable = true;
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port = 22;
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hostKeys = cfg.sshHostKeys;
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authorizedKeys = cfg.sshAuthorizedKeys;
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};
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boot.initrd.postDeviceCommands = ''
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echo 'waiting for root device to be opened...'
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mkfifo /crypt-ramfs/passphrase
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echo /crypt-ramfs/passphrase >> /dev/null
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'';
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boot.initrd.secrets = lib.mkIf cfg.enableTorUnlock {
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"/etc/tor/onion/bootup" = cfg.onionConfig;
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};
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boot.initrd.extraUtilsCommands = lib.mkIf cfg.enableTorUnlock ''
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copy_bin_and_libs ${pkgs.tor}/bin/tor
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copy_bin_and_libs ${pkgs.haveged}/bin/haveged
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'';
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boot.initrd.network.postCommands = lib.mkMerge [
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(
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''
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# Add nice prompt for giving LUKS passphrase over ssh
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echo 'read -s -p "Unlock Passphrase: " passphrase && echo $passphrase > /crypt-ramfs/passphrase && exit' >> /root/.profile
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''
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)
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(
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let torRc = (pkgs.writeText "tor.rc" ''
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DataDirectory /etc/tor
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SOCKSPort 127.0.0.1:9050 IsolateDestAddr
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SOCKSPort 127.0.0.1:9063
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HiddenServiceDir /etc/tor/onion/bootup
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HiddenServicePort 22 127.0.0.1:22
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''); in
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lib.mkIf cfg.enableTorUnlock ''
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echo "tor: preparing onion folder"
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# have to do this otherwise tor does not want to start
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chmod -R 700 /etc/tor
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echo "make sure localhost is up"
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ip a a 127.0.0.1/8 dev lo
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ip link set lo up
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echo "haveged: starting haveged"
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haveged -F &
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echo "tor: starting tor"
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tor -f ${torRc} --verify-config
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tor -f ${torRc} &
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''
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)
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];
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};
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}
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