310 lines
11 KiB
Nix
310 lines
11 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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options.services.lnd = {
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enable = mkEnableOption "Lightning Network Daemon";
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address = mkOption {
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type = types.str;
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default = "localhost";
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description = "Address to listen for peer connections";
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};
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port = mkOption {
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type = types.port;
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default = 9735;
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description = "Port to listen for peer connections";
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};
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rpcAddress = mkOption {
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type = types.str;
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default = "localhost";
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description = "Address to listen for RPC connections.";
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};
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rpcPort = mkOption {
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type = types.port;
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default = 10009;
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description = "Port to listen for gRPC connections.";
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};
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restAddress = mkOption {
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type = types.str;
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default = "localhost";
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description = "Address to listen for REST connections.";
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};
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restPort = mkOption {
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type = types.port;
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default = 8080;
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description = "Port to listen for REST connections.";
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};
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dataDir = mkOption {
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type = types.path;
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default = "/var/lib/lnd";
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description = "The data directory for LND.";
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};
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networkDir = mkOption {
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readOnly = true;
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default = "${cfg.dataDir}/chain/bitcoin/${bitcoind.network}";
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description = "The network data directory.";
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};
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tor-socks = mkOption {
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type = types.nullOr types.str;
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default = if cfg.enforceTor then config.nix-bitcoin.torClientAddressWithPort else null;
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description = "Socks proxy for connecting to Tor nodes";
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};
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macaroons = mkOption {
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default = {};
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type = with types; attrsOf (submodule {
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options = {
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user = mkOption {
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type = types.str;
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description = "User who owns the macaroon.";
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};
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permissions = mkOption {
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type = types.str;
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example = ''
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{"entity":"info","action":"read"},{"entity":"onchain","action":"read"}
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'';
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description = "List of granted macaroon permissions.";
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};
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};
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});
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description = ''
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Extra macaroon definitions.
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'';
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};
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extraConfig = mkOption {
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type = types.lines;
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default = "";
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example = ''
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autopilot.active=1
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'';
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description = "Extra lines appended to <filename>lnd.conf</filename>.";
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};
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package = mkOption {
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type = types.package;
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default = config.nix-bitcoin.pkgs.lnd;
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description = "The package providing lnd binaries.";
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};
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cli = mkOption {
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default = pkgs.writeScriptBin "lncli"
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# Switch user because lnd makes datadir contents readable by user only
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''
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${runAsUser} ${cfg.user} ${cfg.package}/bin/lncli \
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--rpcserver ${cfg.rpcAddress}:${toString cfg.rpcPort} \
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--tlscertpath '${cfg.certPath}' \
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--macaroonpath '${networkDir}/admin.macaroon' "$@"
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'';
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description = "Binary to connect with the lnd instance.";
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};
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getPublicAddressCmd = mkOption {
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type = types.str;
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default = "";
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description = ''
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Bash expression which outputs the public service address to announce to peers.
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If left empty, no address is announced.
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'';
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};
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user = mkOption {
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type = types.str;
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default = "lnd";
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description = "The user as which to run LND.";
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};
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group = mkOption {
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type = types.str;
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default = cfg.user;
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description = "The group as which to run LND.";
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};
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certPath = mkOption {
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readOnly = true;
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default = "${secretsDir}/lnd-cert";
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description = "LND TLS certificate path.";
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};
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inherit (nbLib) enforceTor;
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};
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cfg = config.services.lnd;
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nbLib = config.nix-bitcoin.lib;
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secretsDir = config.nix-bitcoin.secretsDir;
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runAsUser = config.nix-bitcoin.runAsUserCmd;
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bitcoind = config.services.bitcoind;
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bitcoindRpcAddress = nbLib.address bitcoind.rpc.address;
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networkDir = cfg.networkDir;
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configFile = pkgs.writeText "lnd.conf" ''
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datadir=${cfg.dataDir}
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logdir=${cfg.dataDir}/logs
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tlscertpath=${cfg.certPath}
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tlskeypath=${secretsDir}/lnd-key
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listen=${toString cfg.address}:${toString cfg.port}
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rpclisten=${cfg.rpcAddress}:${toString cfg.rpcPort}
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restlisten=${cfg.restAddress}:${toString cfg.restPort}
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bitcoin.${bitcoind.network}=1
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bitcoin.active=1
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bitcoin.node=bitcoind
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${optionalString (cfg.enforceTor) "tor.active=true"}
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${optionalString (cfg.tor-socks != null) "tor.socks=${cfg.tor-socks}"}
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bitcoind.rpchost=${bitcoindRpcAddress}:${toString bitcoind.rpc.port}
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bitcoind.rpcuser=${bitcoind.rpc.users.public.name}
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bitcoind.zmqpubrawblock=${bitcoind.zmqpubrawblock}
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bitcoind.zmqpubrawtx=${bitcoind.zmqpubrawtx}
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${cfg.extraConfig}
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'';
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in {
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inherit options;
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config = mkIf cfg.enable {
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assertions = [
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{ assertion = bitcoind.prune == 0;
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message = "lnd does not support bitcoind pruning.";
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}
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{ assertion =
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!(config.services ? clightning)
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|| !config.services.clightning.enable
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|| config.services.clightning.port != cfg.port;
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message = ''
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LND and clightning can't both bind to lightning port 9735. Either
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disable LND/clightning or change services.clightning.port or
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services.lnd.port to a port other than 9735.
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'';
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}
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];
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services.bitcoind = {
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enable = true;
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# Increase rpc thread count due to reports that lightning implementations fail
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# under high bitcoind rpc load
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rpc.threads = 16;
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zmqpubrawblock = "tcp://${bitcoindRpcAddress}:28332";
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zmqpubrawtx = "tcp://${bitcoindRpcAddress}:28333";
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};
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environment.systemPackages = [ cfg.package (hiPrio cfg.cli) ];
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systemd.tmpfiles.rules = [
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"d '${cfg.dataDir}' 0770 ${cfg.user} ${cfg.group} - -"
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];
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systemd.services.lnd = {
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wantedBy = [ "multi-user.target" ];
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requires = [ "bitcoind.service" ];
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after = [ "bitcoind.service" ];
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preStart = ''
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install -m600 ${configFile} '${cfg.dataDir}/lnd.conf'
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{
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echo "bitcoind.rpcpass=$(cat ${secretsDir}/bitcoin-rpcpassword-public)"
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${optionalString (cfg.getPublicAddressCmd != "") ''
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echo "externalip=$(${cfg.getPublicAddressCmd})"
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''}
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} >> '${cfg.dataDir}/lnd.conf'
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'';
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serviceConfig = nbLib.defaultHardening // {
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RuntimeDirectory = "lnd"; # Only used to store custom macaroons
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RuntimeDirectoryMode = "711";
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ExecStart = "${cfg.package}/bin/lnd --configfile=${cfg.dataDir}/lnd.conf";
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User = cfg.user;
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TimeoutSec = "15min";
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Restart = "on-failure";
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RestartSec = "10s";
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ReadWritePaths = cfg.dataDir;
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ExecStartPost = let
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# Retrying is necessary because it can happen that the lnd socket is
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# existing, but the RPC service isn't yet, which results in error
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# "waiting to start, RPC services not available".
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curl = "${pkgs.curl}/bin/curl -s --show-error --retry 10 --cacert ${cfg.certPath}";
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restUrl = "https://${nbLib.addressWithPort cfg.restAddress cfg.restPort}/v1";
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in [
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(nbLib.script "lnd-create-wallet" ''
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attempts=250
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while ! {
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exec 3>/dev/tcp/${nbLib.address cfg.restAddress}/${toString cfg.restPort} && exec 3>&-
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} &>/dev/null; do
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((attempts-- == 0)) && { echo "lnd REST service unreachable"; exit 1; }
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sleep 0.1
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done
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if [[ ! -f ${networkDir}/wallet.db ]]; then
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mnemonic="${cfg.dataDir}/lnd-seed-mnemonic"
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if [[ ! -f "$mnemonic" ]]; then
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echo "Create lnd seed"
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umask u=r,go=
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${curl} -X GET ${restUrl}/genseed | ${pkgs.jq}/bin/jq -c '.cipher_seed_mnemonic' > "$mnemonic"
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fi
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echo "Create lnd wallet"
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${curl} --output /dev/null \
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-X POST -d "{\"wallet_password\": \"$(cat ${secretsDir}/lnd-wallet-password | tr -d '\n' | base64 -w0)\", \
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\"cipher_seed_mnemonic\": $(cat "$mnemonic" | tr -d '\n')}" \
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${restUrl}/initwallet
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# Guarantees that RPC calls with cfg.cli succeed after the service is started
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echo "Wait until wallet is created"
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while [[ ! -f ${networkDir}/admin.macaroon ]]; do
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sleep 0.1
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done
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else
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echo "Unlock lnd wallet"
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${curl} \
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-H "Grpc-Metadata-macaroon: $(${pkgs.xxd}/bin/xxd -ps -u -c 99999 '${networkDir}/admin.macaroon')" \
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-X POST \
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-d "{\"wallet_password\": \"$(cat ${secretsDir}/lnd-wallet-password | tr -d '\n' | base64 -w0)\"}" \
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${restUrl}/unlockwallet
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fi
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# Wait until the wallet has been unlocked and RPC is fully active
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while [[ $(${curl} -d '{}' -X POST ${restUrl}/state | ${pkgs.jq}/bin/jq -r '.state') != RPC_ACTIVE ]]; do
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sleep 0.1
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done
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'')
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# Setting macaroon permission for other users needs root permissions
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(nbLib.rootScript "lnd-create-macaroons" ''
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umask ug=r,o=
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${lib.concatMapStrings (macaroon: ''
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echo "Create custom macaroon ${macaroon}"
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macaroonPath="$RUNTIME_DIRECTORY/${macaroon}.macaroon"
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${curl} \
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-H "Grpc-Metadata-macaroon: $(${pkgs.xxd}/bin/xxd -ps -u -c 99999 '${networkDir}/admin.macaroon')" \
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-X POST \
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-d '{"permissions":[${cfg.macaroons.${macaroon}.permissions}]}' \
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${restUrl}/macaroon |\
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${pkgs.jq}/bin/jq -c '.macaroon' | ${pkgs.xxd}/bin/xxd -p -r > "$macaroonPath"
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chown ${cfg.macaroons.${macaroon}.user}: "$macaroonPath"
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'') (attrNames cfg.macaroons)}
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'')
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];
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} // nbLib.allowedIPAddresses cfg.enforceTor;
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};
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users.users.${cfg.user} = {
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isSystemUser = true;
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group = cfg.group;
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extraGroups = [ "bitcoinrpc-public" ];
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home = cfg.dataDir; # lnd creates .lnd dir in HOME
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};
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users.groups.${cfg.group} = {};
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nix-bitcoin.operator = {
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groups = [ cfg.group ];
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allowRunAsUsers = [ cfg.user ];
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};
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nix-bitcoin.secrets = {
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lnd-wallet-password.user = cfg.user;
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lnd-key.user = cfg.user;
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lnd-cert.user = cfg.user;
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lnd-cert.permissions = "444"; # world readable
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};
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# Advantages of manually pre-generating certs:
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# - Reduces dynamic state
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# - Enables deployment of a mesh of server plus client nodes with predefined certs
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nix-bitcoin.generateSecretsCmds.lnd = ''
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makePasswordSecret lnd-wallet-password
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makeCert lnd '${optionalString (cfg.rpcAddress != "localhost") "IP:${cfg.rpcAddress}"}'
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'';
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};
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}
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