333 lines
11 KiB
Nix
333 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, a Lightning Network implementation in Go";
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address = mkOption {
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type = types.str;
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default = "localhost";
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description = mdDoc "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 = mdDoc "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 = mdDoc "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 = mdDoc "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 = mdDoc "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 = mdDoc "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 = mdDoc "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 = mdDoc "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.tor.proxy then config.nix-bitcoin.torClientAddressWithPort else null;
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description = mdDoc "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 = mdDoc "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 = mdDoc "List of granted macaroon permissions.";
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};
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};
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});
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description = mdDoc ''
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Extra macaroon definitions.
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'';
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};
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certificate = {
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extraIPs = mkOption {
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type = with types; listOf str;
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default = [];
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example = [ "60.100.0.1" ];
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description = mdDoc ''
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Extra `subjectAltName` IPs added to the certificate.
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This works the same as lnd option {option}`tlsextraip`.
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'';
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};
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extraDomains = mkOption {
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type = with types; listOf str;
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default = [];
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example = [ "example.com" ];
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description = mdDoc ''
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Extra `subjectAltName` domain names added to the certificate.
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This works the same as lnd option {option}`tlsextradomain`.
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'';
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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 = mdDoc ''
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Extra lines appended to {file}`lnd.conf`.
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See here for all available options:
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https://github.com/lightningnetwork/lnd/blob/master/sample-lnd.conf
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'';
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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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defaultText = "config.nix-bitcoin.pkgs.lnd";
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description = mdDoc "The package providing lnd binaries.";
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};
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cli = mkOption {
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default = pkgs.writers.writeBashBin "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' "$@"
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'';
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defaultText = "(See source)";
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description = mdDoc "Binary to connect with the lnd instance.";
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};
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getPublicAddressCmd = mkOption {
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type = types.str;
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default = "";
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description = mdDoc ''
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Bash expression which outputs the public service address to announce to peers.
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If left empty, no address is announced.
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'';
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};
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user = mkOption {
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type = types.str;
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default = "lnd";
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description = mdDoc "The user as which to run LND.";
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};
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group = mkOption {
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type = types.str;
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default = cfg.user;
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description = mdDoc "The group as which to run LND.";
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};
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certPath = mkOption {
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readOnly = true;
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default = "${secretsDir}/lnd-cert";
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description = mdDoc "LND TLS certificate path.";
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};
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tor = nbLib.tor;
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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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lndinit = "${config.nix-bitcoin.pkgs.lndinit}/bin/lndinit";
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bitcoind = config.services.bitcoind;
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bitcoindRpcAddress = nbLib.address bitcoind.rpc.address;
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networkDir = cfg.networkDir;
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configFile = pkgs.writeText "lnd.conf" ''
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datadir=${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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${optionalString (cfg.tor.proxy) "tor.active=true"}
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${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.${rpcUser}.name}
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bitcoind.zmqpubrawblock=${zmqHandleSpecialAddress bitcoind.zmqpubrawblock}
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bitcoind.zmqpubrawtx=${zmqHandleSpecialAddress bitcoind.zmqpubrawtx}
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wallet-unlock-password-file=${secretsDir}/lnd-wallet-password
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${cfg.extraConfig}
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'';
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zmqHandleSpecialAddress = builtins.replaceStrings [ "0.0.0.0" "[::]" ] [ "127.0.0.1" "[::1]" ];
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isPruned = bitcoind.prune > 0;
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# When bitcoind pruning is enabled, lnd requires non-public RPC commands `getpeerinfo`, `getnodeaddresses`
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# to fetch missing blocks from peers (implemented in btcsuite/btcwallet/chain/pruned_block_dispatcher.go)
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rpcUser = if isPruned then "lnd" else "public";
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in {
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inherit options;
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config = mkIf cfg.enable (mkMerge [ {
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assertions = [
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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 = mkDefault "tcp://${bitcoindRpcAddress}:28332";
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zmqpubrawtx = mkDefault "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} ${cfg.group} - -"
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];
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services.lnd.certificate.extraIPs = mkIf (cfg.rpcAddress != "localhost") [ "${cfg.rpcAddress}" ];
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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 ${secretsDir}/bitcoin-rpcpassword-${rpcUser})"
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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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if [[ ! -f ${networkDir}/wallet.db ]]; then
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seed='${cfg.dataDir}/lnd-seed-mnemonic'
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if [[ ! -f "$seed" ]]; then
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echo "Create lnd seed"
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(umask u=r,go=; ${lndinit} gen-seed > "$seed")
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fi
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echo "Create lnd wallet"
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${lndinit} -v init-wallet \
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--file.seed="$seed" \
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--file.wallet-password='${secretsDir}/lnd-wallet-password' \
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--init-file.output-wallet-dir='${cfg.networkDir}'
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fi
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'';
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serviceConfig = nbLib.defaultHardening // {
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Type = "notify";
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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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curl = "${pkgs.curl}/bin/curl -fsS --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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# Setting macaroon permissions 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}: "$macaroonPath"
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'') (attrNames cfg.macaroons)}
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'';
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} // nbLib.allowedIPAddresses cfg.tor.enforce;
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};
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users.users.${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.${cfg.group} = {};
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nix-bitcoin.operator = {
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groups = [ cfg.group ];
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allowRunAsUsers = [ cfg.user ];
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};
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nix-bitcoin.secrets = {
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lnd-wallet-password.user = cfg.user;
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lnd-key.user = cfg.user;
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lnd-cert.user = cfg.user;
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lnd-cert.permissions = "444"; # world readable
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};
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# Advantages of manually pre-generating certs:
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# - Reduces dynamic state
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# - Enables deployment of a mesh of server plus client nodes with predefined certs
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nix-bitcoin.generateSecretsCmds.lnd = ''
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makePasswordSecret lnd-wallet-password
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makeCert lnd '${nbLib.mkCertExtraAltNames cfg.certificate}'
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'';
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}
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(mkIf isPruned {
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services.bitcoind.rpc.users.lnd = {
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passwordHMACFromFile = true;
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rpcwhitelist = bitcoind.rpc.users.public.rpcwhitelist ++ [
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"getpeerinfo"
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"getnodeaddresses"
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];
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};
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nix-bitcoin.secrets = {
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bitcoin-rpcpassword-lnd.user = cfg.user;
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bitcoin-HMAC-lnd.user = bitcoind.user;
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};
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nix-bitcoin.generateSecretsCmds.lndBitcoinRPC = ''
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makeBitcoinRPCPassword lnd
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'';
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}) ]);
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}
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