Add LND support

2019-08-05 10:44:38 +02:00 · 2019-08-05 10:44:38 +02:00 · 9b0753135c
commit 9b0753135c
parent 4acf5cd32c
11 changed files with 261 additions and 17 deletions
--- a/modules/lnd.nix
+++ b/modules/lnd.nix
@ -0,0 +1,128 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  nix-bitcoin-services = pkgs.callPackage ./nix-bitcoin-services.nix { };
+  cfg = config.services.lnd;
+  configFile = pkgs.writeText "lnd.conf" ''
+    datadir=${cfg.dataDir}
+    bitcoin.mainnet=1
+    tlscertpath=/secrets/lnd_cert
+    tlskeypath=/secrets/lnd_key
+
+    bitcoin.active=1
+    bitcoin.node=bitcoind
+
+    tor.active=true
+    tor.v3=true
+    tor.streamisolation=true
+
+    bitcoind.rpcuser=${config.services.bitcoind.rpcuser}
+    bitcoind.zmqpubrawblock=${config.services.bitcoind.zmqpubrawblock}
+    bitcoind.zmqpubrawtx=${config.services.bitcoind.zmqpubrawtx}
+
+    ${cfg.extraConfig}
+  '';
+  init-lnd-wallet-script = pkgs.writeScript "init-lnd-wallet.sh" ''
+#!/bin/sh
+
+set -e
+
+${pkgs.coreutils}/bin/sleep 5
+
+if [ ! -f ${cfg.dataDir}/chain/bitcoin/mainnet/wallet.db ]
+then
+  ${pkgs.coreutils}/bin/echo creating LND wallet
+
+  ${pkgs.curl}/bin/curl -s \
+  --cacert /secrets/lnd_cert \
+  -X GET https://127.0.0.1:8080/v1/genseed | ${pkgs.jq}/bin/jq -c '.cipher_seed_mnemonic' > /secrets/lnd-seed-mnemonic
+
+  ${pkgs.curl}/bin/curl -s \
+  --cacert /secrets/lnd_cert \
+  -X POST -d "{\"wallet_password\": \"$(${pkgs.coreutils}/bin/cat /secrets/lnd-wallet-password | ${pkgs.coreutils}/bin/tr -d '\n' | ${pkgs.coreutils}/bin/base64 -w0)\", \
+  \"cipher_seed_mnemonic\": $(${pkgs.coreutils}/bin/cat /secrets/lnd-seed-mnemonic | ${pkgs.coreutils}/bin/tr -d '\n')}" \
+  https://127.0.0.1:8080/v1/initwallet
+
+  ${pkgs.coreutils}/bin/echo wallet created
+else
+  ${pkgs.coreutils}/bin/echo unlocking wallet
+
+  ${pkgs.curl}/bin/curl -s \
+      -H "Grpc-Metadata-macaroon: $(${pkgs.xxd}/bin/xxd -ps -u -c 1000 ${cfg.dataDir}/chain/bitcoin/mainnet/admin.macaroon)" \
+      --cacert /secrets/lnd_cert \
+      -X POST \
+      -d "{\"wallet_password\": \"$(${pkgs.coreutils}/bin/cat /secrets/lnd-wallet-password | ${pkgs.coreutils}/bin/tr -d '\n' | ${pkgs.coreutils}/bin/base64 -w0)\"}" \
+      https://127.0.0.1:8080/v1/unlockwallet
+
+  ${pkgs.coreutils}/bin/echo wallet unlocked
+fi
+
+exit 0
+'';
+in {
+
+  options.services.lnd = {
+    enable = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        If enabled, the LND service will be installed.
+      '';
+    };
+    dataDir = mkOption {
+      type = types.path;
+      default = "/var/lib/lnd";
+      description = "The data directory for LND.";
+    };
+    extraConfig = mkOption {
+        type = types.lines;
+        default = "";
+        example = ''
+          autopilot.active=1
+        '';
+        description = "Additional configurations to be appended to <filename>lnd.conf</filename>.";
+      };
+    enforceTor =  nix-bitcoin-services.enforceTor;
+  };
+
+  config = mkIf cfg.enable {
+    users.users.lnd = {
+        description = "LND User";
+        group = "lnd";
+        extraGroups = [ "bitcoinrpc" "keys" ];
+        home = cfg.dataDir;
+    };
+    users.groups.lnd = {
+      name = "lnd";
+    };
+
+    systemd.services.lnd = {
+      description = "Run LND";
+      path  = [ pkgs.altcoins.bitcoind ];
+      wantedBy = [ "multi-user.target" ];
+      requires = [ "bitcoind.service" ];
+      after = [ "bitcoind.service" ];
+      preStart = ''
+        mkdir -m 0770 -p ${cfg.dataDir}
+        cp ${configFile} ${cfg.dataDir}/lnd.conf
+        chown -R 'lnd:lnd' '${cfg.dataDir}'
+        chmod u=rw,g=r,o= ${cfg.dataDir}/lnd.conf
+        echo "bitcoind.rpcpass=$(cat /secrets/bitcoin-rpcpassword)" >> '${cfg.dataDir}/lnd.conf'
+      '';
+      serviceConfig = {
+        PermissionsStartOnly = "true";
+        ExecStart = "${pkgs.lnd}/bin/lnd --configfile=${cfg.dataDir}/lnd.conf";
+        ExecStartPost = "${pkgs.bash}/bin/bash ${init-lnd-wallet-script}";
+        User = "lnd";
+        Restart = "on-failure";
+        RestartSec = "10s";
+      } // nix-bitcoin-services.defaultHardening
+        // (if cfg.enforceTor
+          then nix-bitcoin-services.allowTor
+          else nix-bitcoin-services.allowAnyIP
+        ) // nix-bitcoin-services.allowAnyProtocol;  # For ZMQ
+    };
+  };
+}