Merge #107: Add LND support

9d029fd1af Remove lnd explicit tor onion service config (Ștefan D. Mihăilă)
1f407ef22c Remove lnd user from onion-chef (Ștefan D. Mihăilă)
5880023158 Increase xxd column size (Ștefan D. Mihăilă)
101ae3c370 Instruct user to backup channel.backup (Ștefan D. Mihăilă)
fccd91972a Fix "value is a list [...]" error when lnd is not enabled (Ștefan D. Mihăilă)
700fdf6feb Add logdir and tor.privatekeypath to lnd.conf (Ștefan D. Mihăilă)
5a2517b926 Check for existing secrets and create them  more granularly (Ștefan D. Mihăilă)
d6f961db89 Reuse lnd seed (Ștefan D. Mihăilă)
9b0753135c Add LND support (Ștefan D. Mihăilă)
4acf5cd32c Remove unused nginx.csr file (Ștefan D. Mihăilă)
19b971f21f Rename nginx certificate files (Ștefan D. Mihăilă)

Pull request description:

ACKs for top commit:
  jonasnick:
    ACK 9d029fd1af

Tree-SHA512: 58ee80bcab6c3a1c4642a5d40b94e10d28311557ae7c69539fee90d6f252a6afc70b8066cc7d7ddc0a45e2675978718a369b0341c518f8ce7590cbde1403eaeb

configuration.nix

@@ -30,6 +30,19 @@
   # default nix-bitcoin nodes offer outgoing connectivity.
   # services.clightning.autolisten = true;
 
+  ### LND
+  # Disable clightning and uncomment the following line in order to enable lnd,
+  # a lightning implementation written in Go.
+  # services.lnd.enable = assert (!config.services.clightning.enable); true;
+  ## WARNING
+  # If you use lnd, you should manually backup your wallet mnemonic
+  # seed. This will allow you to recover on-chain funds. You can run the
+  # following command after the lnd service starts:
+  # nixops scp --from bitcoin-node /secrets/lnd-seed-mnemonic ./secrets/lnd-seed-mnemonic
+  # You should also backup your channel state after opening new channels.
+  # This will allow you to recover off-chain funds, by force-closing channels.
+  # nixops scp --from bitcoin-node /var/lib/lnd/chain/bitcoin/mainnet/channel.backup /my-backup-path/channel.backup
+
   ### SPARK WALLET
   # Enable this module to use spark-wallet, a minimalistic wallet GUI for
   # c-lightning, accessible over the web or through mobile and desktop apps.

modules/bitcoind.nix

@@ -193,6 +193,18 @@ in {
           to stay under the specified target size in MiB)
         '';
       };
+      zmqpubrawblock = mkOption {
+        type = types.nullOr types.string;
+        default = null;
+        example = "tcp://127.0.0.1:28332";
+        description = "ZMQ address for zmqpubrawblock notifications";
+      };
+      zmqpubrawtx = mkOption {
+        type = types.nullOr types.string;
+        default = null;
+        example = "tcp://127.0.0.1:28333";
+        description = "ZMQ address for zmqpubrawtx notifications";
+      };
       enforceTor =  nix-bitcoin-services.enforceTor;
     };
   };
@@ -239,7 +251,7 @@ in {
         // (if cfg.enforceTor
           then nix-bitcoin-services.allowTor
           else nix-bitcoin-services.allowAnyIP
-        );
+        ) // optionalAttrs config.services.lnd.enable nix-bitcoin-services.allowAnyProtocol;  # FOR ZMQ
     };
     systemd.services.bitcoind-import-banlist = {
       description = "Bitcoin daemon banlist importer";

modules/default.nix

@@ -11,4 +11,5 @@
   nix-bitcoin-webindex = ./nix-bitcoin-webindex.nix;
   spark-wallet = ./spark-wallet.nix;
   recurring-donations = ./recurring-donations.nix;
+  lnd = ./lnd.nix;
 }

modules/electrs.nix

@@ -106,8 +106,8 @@ in {
             listen ${toString config.services.electrs.nginxport} ssl;
             proxy_pass electrs;
 
-            ssl_certificate /secrets/ssl_certificate;
-            ssl_certificate_key /secrets/ssl_certificate_key;
+            ssl_certificate /secrets/nginx_cert;
+            ssl_certificate_key /secrets/nginx_key;
             ssl_session_cache shared:SSL:1m;
             ssl_session_timeout 4h;
             ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;

modules/lnd.nix

@@ -0,0 +1,132 @@
+{ 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=${cfg.dataDir}
+    logdir=${cfg.dataDir}/logs
+    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
+    tor.privatekeypath=${cfg.dataDir}/v3_onion_private_key
+
+    bitcoind.rpcuser=${config.services.bitcoind.rpcuser}
+    bitcoind.zmqpubrawblock=${config.services.bitcoind.zmqpubrawblock}
+    bitcoind.zmqpubrawtx=${config.services.bitcoind.zmqpubrawtx}
+
+    ${cfg.extraConfig}
+  '';
+  init-lnd-wallet-script = pkgs.writeScript "init-lnd-wallet.sh" ''
+#!/bin/sh
+
+set -e
+umask 377
+
+${pkgs.coreutils}/bin/sleep 5
+
+if [ ! -f /secrets/lnd-seed-mnemonic ]
+then
+  ${pkgs.coreutils}/bin/echo Creating lnd seed
+
+  ${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
+fi
+
+if [ ! -f ${cfg.dataDir}/chain/bitcoin/mainnet/wallet.db ]
+then
+  ${pkgs.coreutils}/bin/echo Creating lnd wallet
+
+  ${pkgs.curl}/bin/curl -s \
+  --cacert /secrets/lnd_cert \
+  -X POST -d "{\"wallet_password\": \"$(${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
+else
+  ${pkgs.coreutils}/bin/echo Unlocking lnd wallet
+
+  ${pkgs.curl}/bin/curl -s \
+      -H "Grpc-Metadata-macaroon: $(${pkgs.xxd}/bin/xxd -ps -u -c 99999 ${cfg.dataDir}/chain/bitcoin/mainnet/admin.macaroon)" \
+      --cacert /secrets/lnd_cert \
+      -X POST \
+      -d "{\"wallet_password\": \"$(${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
+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
+    };
+  };
+}

modules/nix-bitcoin-pkgs.nix

@@ -15,5 +15,6 @@ in {
     bitcoin = nixpkgs-unstable.bitcoin.override { miniupnpc = null; };
     altcoins.bitcoind = nixpkgs-unstable.altcoins.bitcoind.override { miniupnpc = null; };
     clightning = nixpkgs-unstable.clightning.override { };
+    lnd = nixpkgs-unstable.lnd.override { };
   };
 }

modules/nix-bitcoin.nix

@@ -28,6 +28,7 @@ in {
     ./onion-chef.nix
     ./recurring-donations.nix
     ./hardware-wallets.nix
+    ./lnd.nix
   ];
 
   options.services.nix-bitcoin = {
@@ -46,6 +47,8 @@ in {
     # Tor
     services.tor.enable = true;
     services.tor.client.enable = true;
+    # LND uses ControlPort to create onion services
+    services.tor.controlPort = if config.services.lnd.enable then 9051 else null;
 
     # Tor SSH service
     services.tor.hiddenServices.sshd = {
@@ -64,12 +67,16 @@ in {
     services.bitcoind.enforceTor = true;
     services.bitcoind.port = 8333;
     services.bitcoind.rpcuser = "bitcoinrpc";
+    services.bitcoind.zmqpubrawblock = "tcp://127.0.0.1:28332";
+    services.bitcoind.zmqpubrawtx = "tcp://127.0.0.1:28333";
     services.bitcoind.extraConfig = ''
       assumevalid=0000000000000000000726d186d6298b5054b9a5c49639752294b322a305d240
       addnode=ecoc5q34tmbq54wl.onion
       discover=0
       addresstype=bech32
       changetype=bech32
+      ${optionalString (config.services.lnd.enable) "zmqpubrawblock=${config.services.bitcoind.zmqpubrawblock}"}
+      ${optionalString (config.services.lnd.enable) "zmqpubrawtx=${config.services.bitcoind.zmqpubrawtx}"}
     '';
     services.bitcoind.prune = 0;
     services.bitcoind.dbCache = 1000;
@@ -96,11 +103,15 @@ in {
       version = 3;
     };
 
+    # lnd
+    services.lnd.enforceTor = true;
+
     # Create user operator which can use bitcoin-cli and lightning-cli
     users.users.operator = {
       isNormalUser = true;
       extraGroups = [ config.services.bitcoind.group ]
         ++ (if config.services.clightning.enable then [ "clightning" ] else [ ])
+        ++ (if config.services.lnd.enable then [ "lnd" ] else [ ])
         ++ (if config.services.liquidd.enable then [ config.services.liquidd.group ] else [ ])
         ++ (if (config.services.hardware-wallets.ledger || config.services.hardware-wallets.trezor)
           then [ config.services.hardware-wallets.group ] else [ ]);
@@ -111,17 +122,26 @@ in {
 
     environment.interactiveShellInit = ''
       alias bitcoin-cli='bitcoin-cli -datadir=${config.services.bitcoind.dataDir}'
-      alias lightning-cli='sudo -u clightning lightning-cli --lightning-dir=${config.services.clightning.dataDir}'
-    '' + (if config.services.liquidd.enable then ''
-      alias elements-cli='elements-cli -datadir=${config.services.liquidd.dataDir}'
-      alias liquidswap-cli='liquidswap-cli -c ${config.services.liquidd.dataDir}/elements.conf'
-    '' else "");
+      ${optionalString (config.services.clightning.enable) ''
+        alias lightning-cli='sudo -u clightning lightning-cli --lightning-dir=${config.services.clightning.dataDir}'
+      ''}
+      ${optionalString (config.services.lnd.enable) ''
+        alias lncli='sudo -u lnd lncli --tlscertpath /secrets/lnd_cert --macaroonpath ${config.services.lnd.dataDir}/chain/bitcoin/mainnet/admin.macaroon'
+      ''}
+      ${optionalString (config.services.liquidd.enable) ''
+        alias elements-cli='elements-cli -datadir=${config.services.liquidd.dataDir}'
+        alias liquidswap-cli='liquidswap-cli -c ${config.services.liquidd.dataDir}/elements.conf'
+      ''}
+    '';
     # Unfortunately c-lightning doesn't allow setting the permissions of the rpc socket
     # https://github.com/ElementsProject/lightning/issues/1366
     security.sudo.configFile = (
       if config.services.clightning.enable then ''
         operator    ALL=(clightning) NOPASSWD: ALL
       ''
+      else if config.services.lnd.enable then ''
+        operator    ALL=(lnd) NOPASSWD: ALL
+      ''
       else ""
     );
 
@@ -176,6 +196,7 @@ in {
       qrencode
     ]
     ++ optionals config.services.clightning.enable [clightning]
+    ++ optionals config.services.lnd.enable [lnd]
     ++ optionals config.services.lightning-charge.enable [lightning-charge]
     ++ optionals config.services.nanopos.enable [nanopos]
     ++ optionals config.services.nix-bitcoin-webindex.enable [nginx]

network/network.nix

@@ -7,6 +7,13 @@ let
     group = "bitcoinrpc";
     permissions = "0440";
   };
+  lnd-wallet-password = {
+    text = secrets.lnd-wallet-password;
+    destDir = "/secrets/";
+    user = "lnd";
+    group = "lnd";
+    permissions = "0440";
+  };
   lightning-charge-api-token = {
     text = "API_TOKEN=" + secrets.lightning-charge-api-token;
     destDir = "/secrets/";
@@ -36,20 +43,34 @@ let
     group = "clightning";
     permissions = "0440";
   };
-  ssl_certificate_key = {
-    keyFile = ../secrets/ssl_certificate_key.key;
+  nginx_key = {
+    keyFile = ../secrets/nginx.key;
     destDir = "/secrets/";
     user = "nginx";
     group = "root";
     permissions = "0440";
   };
-  ssl_certificate = {
-    keyFile = ../secrets/ssl_certificate.crt;
+  nginx_cert = {
+    keyFile = ../secrets/nginx.cert;
     destDir = "/secrets/";
     user = "nginx";
     group = "root";
     permissions = "0440";
   };
+  lnd_key = {
+    keyFile = ../secrets/lnd.key;
+    destDir = "/secrets/";
+    user = "lnd";
+    group = "lnd";
+    permissions = "0440";
+  };
+  lnd_cert = {
+    keyFile = ../secrets/lnd.cert;
+    destDir = "/secrets/";
+    user = "lnd";
+    group = "lnd";
+    permissions = "0440";
+  };
 in {
   network.description = "Bitcoin Core node";
 
@@ -61,10 +82,11 @@ in {
       deployment.keys = {
         inherit bitcoin-rpcpassword;
       }
+      // (if (config.services.lnd.enable) then { inherit lnd-wallet-password lnd_key lnd_cert; } else { })
       // (if (config.services.lightning-charge.enable) then { inherit lightning-charge-api-token; } else { })
       // (if (config.services.nanopos.enable) then { inherit lightning-charge-api-token-for-nanopos; } else { })
       // (if (config.services.liquidd.enable) then { inherit liquid-rpcpassword; } else { })
       // (if (config.services.spark-wallet.enable) then { inherit spark-wallet-login; } else { })
-      // (if (config.services.electrs.enable) then { inherit ssl_certificate_key ssl_certificate; } else { });
+      // (if (config.services.electrs.enable) then { inherit nginx_key nginx_cert; } else { });
     } // (bitcoin-node { inherit config pkgs; });
 }

pkgs/nodeinfo/nodeinfo.sh

@@ -2,14 +2,21 @@ set -e
 set -o pipefail
 
 BITCOIND_ONION="$(cat /var/lib/onion-chef/operator/bitcoind)"
-CLIGHTNING_NODEID=$(sudo -u clightning lightning-cli --lightning-dir=/var/lib/clightning getinfo | jq -r '.id')
-CLIGHTNING_ONION="$(cat /var/lib/onion-chef/operator/clightning)"
-CLIGHTNING_ID="$CLIGHTNING_NODEID@$CLIGHTNING_ONION:9735"
-
 echo BITCOIND_ONION="$BITCOIND_ONION"
-echo CLIGHTNING_NODEID="$CLIGHTNING_NODEID"
-echo CLIGHTNING_ONION="$CLIGHTNING_ONION"
-echo CLIGHTNING_ID="$CLIGHTNING_ID"
+
+if [ -x "$(command -v clightning)" ]; then
+    CLIGHTNING_NODEID=$(sudo -u clightning lightning-cli --lightning-dir=/var/lib/clightning getinfo | jq -r '.id')
+    CLIGHTNING_ONION="$(cat /var/lib/onion-chef/operator/clightning)"
+    CLIGHTNING_ID="$CLIGHTNING_NODEID@$CLIGHTNING_ONION:9735"
+    echo CLIGHTNING_NODEID="$CLIGHTNING_NODEID"
+    echo CLIGHTNING_ONION="$CLIGHTNING_ONION"
+    echo CLIGHTNING_ID="$CLIGHTNING_ID"
+fi
+
+if [ -x "$(command -v lncli)" ]; then
+    LND_NODEID=$(sudo -u lnd lncli --tlscertpath /secrets/lnd_cert --macaroonpath /var/lib/lnd/chain/bitcoin/mainnet/admin.macaroon getinfo | jq -r '.uris[0]')
+    echo LND_NODEID="$LND_NODEID"
+fi
 
 NGINX_ONION_FILE=/var/lib/onion-chef/operator/nginx
 if [ -e "$NGINX_ONION_FILE" ]; then

secrets/generate_secrets.sh

@@ -2,24 +2,40 @@
 
 SECRETSFILE=secrets/secrets.nix
 
-if [ -e "$SECRETSFILE" ]; then
-    echo $SECRETSFILE already exists. No new secrets were generated.
-    exit 1
+if [ ! -e "$SECRETSFILE" ]; then
+    echo Write secrets to $SECRETSFILE
+    {
+        echo \{
+        echo "  bitcoinrpcpassword = \"$(apg -m 20 -x 20 -M Ncl -n 1)\";"
+        echo "  lnd-wallet-password = \"$(apg -m 20 -x 20 -M Ncl -n 1)\";"
+        echo "  lightning-charge-api-token = \"$(apg -m 20 -x 20 -M Ncl -n 1)\";"
+        echo "  liquidrpcpassword = \"$(apg -m 20 -x 20 -M Ncl -n 1)\";"
+        echo "  spark-wallet-password = \"$(apg -m 20 -x 20 -M Ncl -n 1)\";"
+        echo \}
+    } >> $SECRETSFILE
+    echo Done
+else
+    echo $SECRETSFILE already exists. Skipping.
 fi
 
-echo Write secrets to $SECRETSFILE
-{
-    echo \{
-    echo "  bitcoinrpcpassword = \"$(apg -m 20 -x 20 -M Ncl -n 1)\";"
-    echo "  lightning-charge-api-token = \"$(apg -m 20 -x 20 -M Ncl -n 1)\";"
-    echo "  liquidrpcpassword = \"$(apg -m 20 -x 20 -M Ncl -n 1)\";"
-    echo "  spark-wallet-password = \"$(apg -m 20 -x 20 -M Ncl -n 1)\";"
-    echo \}
-} >> $SECRETSFILE
-echo Done
+if [ ! -e secrets/nginx.key ] || [ ! -e secrets/nginx.cert ]; then
+    echo Generate Nginx Self-Signed Cert
+    openssl genrsa -out secrets/nginx.key 2048
+    openssl req -new -key secrets/nginx.key -out secrets/nginx.csr -subj "/C=KN"
+    openssl x509 -req -days 1825 -in secrets/nginx.csr -signkey secrets/nginx.key -out secrets/nginx.cert
+    rm secrets/nginx.csr
+    echo Done
+else
+    echo Nginx Cert already exists. Skipping.
+fi
 
-echo Generate Self-Signed Cert
-openssl genrsa -out secrets/ssl_certificate_key.key 2048
-openssl req -new -key secrets/ssl_certificate_key.key -out secrets/ssl_certificate.csr -subj "/C=KN"
-openssl x509 -req -days 1825 -in secrets/ssl_certificate.csr -signkey secrets/ssl_certificate_key.key -out secrets/ssl_certificate.crt
-echo Done
+if [ ! -e secrets/lnd.key ] || [ ! -e secrets/lnd.cert ]; then
+    echo Generate LND compatible TLS Cert
+    openssl ecparam -genkey -name prime256v1 -out secrets/lnd.key
+    openssl req -config secrets/openssl.cnf -new -sha256 -key secrets/lnd.key -out secrets/lnd.csr -subj '/CN=localhost/O=lnd'
+    openssl req -config secrets/openssl.cnf -x509 -sha256 -days 1825 -key secrets/lnd.key -in secrets/lnd.csr -out secrets/lnd.cert
+    rm secrets/lnd.csr
+    echo Done
+else
+    echo LND cert already exists. Skipping.
+fi

secrets/openssl.cnf

@@ -0,0 +1,32 @@
+[ req ]
+#default_bits		= 2048
+#default_md		= sha256
+#default_keyfile 	= privkey.pem
+distinguished_name	= req_distinguished_name
+attributes		= req_attributes
+x509_extensions         = v3_ca
+
+[ req_distinguished_name ]
+countryName			= Country Name (2 letter code)
+countryName_min			= 2
+countryName_max			= 2
+stateOrProvinceName		= State or Province Name (full name)
+localityName			= Locality Name (eg, city)
+0.organizationName		= Organization Name (eg, company)
+organizationalUnitName		= Organizational Unit Name (eg, section)
+commonName			= Common Name (eg, fully qualified host name)
+commonName_max			= 64
+emailAddress			= Email Address
+emailAddress_max		= 64
+
+[ req_attributes ]
+challengePassword		= A challenge password
+challengePassword_min		= 4
+challengePassword_max		= 20
+
+[ v3_ca ]
+subjectAltName			= @alt_names
+
+[ alt_names ]
+IP.1 = 127.0.0.1
+DNS.1 = localhost