nix-bitcoin/modules/lnd.nix

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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.lnd;
inherit (config) nix-bitcoin-services;
secretsDir = config.nix-bitcoin.secretsDir;
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bitcoind = config.services.bitcoind;
onion-chef-service = (if cfg.announce-tor then [ "onion-chef.service" ] else []);
mainnetDir = "${cfg.dataDir}/chain/bitcoin/mainnet";
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configFile = pkgs.writeText "lnd.conf" ''
datadir=${cfg.dataDir}
logdir=${cfg.dataDir}/logs
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bitcoin.mainnet=1
tlscertpath=${secretsDir}/lnd-cert
tlskeypath=${secretsDir}/lnd-key
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listen=${toString cfg.listen}:${toString cfg.listenPort}
${lib.concatMapStrings (rpclisten: "rpclisten=${rpclisten}:${toString cfg.rpcPort}\n") cfg.rpclisten}
${lib.concatMapStrings (restlisten: "restlisten=${restlisten}:${toString cfg.restPort}\n") cfg.restlisten}
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bitcoin.active=1
bitcoin.node=bitcoind
tor.active=true
${optionalString (cfg.tor-socks != null) "tor.socks=${cfg.tor-socks}"}
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bitcoind.rpchost=${cfg.bitcoind-host}
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bitcoind.rpcuser=${bitcoind.rpc.users.public.name}
bitcoind.zmqpubrawblock=${bitcoind.zmqpubrawblock}
bitcoind.zmqpubrawtx=${bitcoind.zmqpubrawtx}
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${cfg.extraConfig}
'';
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.";
};
listen = mkOption {
type = pkgs.nix-bitcoin.lib.ipv4Address;
default = "localhost";
description = "Bind to given address to listen to peer connections";
};
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listenPort = mkOption {
type = types.port;
default = 9735;
description = "Bind to given port to listen to peer connections";
};
rpclisten = mkOption {
type = types.listOf types.str;
default = [ "localhost" ];
description = ''
Bind to given address to listen to RPC connections.
'';
};
restlisten = mkOption {
type = types.listOf types.str;
default = [ "localhost" ];
description = ''
Bind to given address to listen to REST connections.
'';
};
rpcPort = mkOption {
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type = types.port;
default = 10009;
description = "Port on which to listen for gRPC connections.";
};
restPort = mkOption {
type = types.port;
default = 8080;
description = "Port on which to listen for REST connections.";
};
bitcoind-host = mkOption {
type = types.str;
default = "127.0.0.1";
description = ''
The host that your local bitcoind daemon is listening on.
'';
};
tor-socks = mkOption {
type = types.nullOr types.str;
default = null;
description = "Set a socks proxy to use to connect to Tor nodes";
};
announce-tor = mkOption {
type = types.bool;
default = false;
description = "Announce LND Tor Hidden Service";
};
macaroons = mkOption {
default = {};
type = with types; attrsOf (submodule {
options = {
user = mkOption {
type = types.str;
description = "User who owns the macaroon.";
};
permissions = mkOption {
type = types.str;
example = ''
{"entity":"info","action":"read"},{"entity":"onchain","action":"read"}
'';
description = "List of granted macaroon permissions.";
};
};
});
description = ''
Extra macaroon definitions.
'';
};
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extraConfig = mkOption {
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type = types.lines;
default = "";
example = ''
autopilot.active=1
'';
description = "Additional configurations to be appended to <filename>lnd.conf</filename>.";
};
package = mkOption {
type = types.package;
default = pkgs.nix-bitcoin.lnd;
defaultText = "pkgs.nix-bitcoin.lnd";
description = "The package providing lnd binaries.";
};
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cli = mkOption {
default = pkgs.writeScriptBin "lncli"
# Switch user because lnd makes datadir contents readable by user only
''
${cfg.cliExec} sudo -u lnd ${cfg.package}/bin/lncli --tlscertpath ${secretsDir}/lnd-cert \
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--macaroonpath '${cfg.dataDir}/chain/bitcoin/mainnet/admin.macaroon' "$@"
'';
description = "Binary to connect with the lnd instance.";
};
inherit (nix-bitcoin-services) cliExec;
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enforceTor = nix-bitcoin-services.enforceTor;
};
config = mkIf cfg.enable {
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assertions = [
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{ assertion = bitcoind.prune == 0;
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message = "lnd does not support bitcoind pruning.";
}
];
environment.systemPackages = [ cfg.package (hiPrio cfg.cli) ];
systemd.tmpfiles.rules = [
"d '${cfg.dataDir}' 0770 lnd lnd - -"
];
services.bitcoind = {
zmqpubrawblock = "tcp://${cfg.bitcoind-host}:28332";
zmqpubrawtx = "tcp://${cfg.bitcoind-host}:28333";
};
services.onion-chef.access.lnd = if cfg.announce-tor then [ "lnd" ] else [];
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systemd.services.lnd = {
description = "Run LND";
path = [ pkgs.nix-bitcoin.bitcoind ];
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wantedBy = [ "multi-user.target" ];
requires = [ "bitcoind.service" ] ++ onion-chef-service;
after = [ "bitcoind.service" ] ++ onion-chef-service;
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preStart = ''
install -m600 ${configFile} '${cfg.dataDir}/lnd.conf'
echo "bitcoind.rpcpass=$(cat ${secretsDir}/bitcoin-rpcpassword-public)" >> '${cfg.dataDir}/lnd.conf'
${optionalString cfg.announce-tor "echo externalip=$(cat /var/lib/onion-chef/lnd/lnd) >> '${cfg.dataDir}/lnd.conf'"}
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'';
serviceConfig = nix-bitcoin-services.defaultHardening // {
RuntimeDirectory = "lnd"; # Only used to store custom macaroons
RuntimeDirectoryMode = "711";
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ExecStart = "${cfg.package}/bin/lnd --configfile=${cfg.dataDir}/lnd.conf";
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User = "lnd";
Restart = "on-failure";
RestartSec = "10s";
ReadWritePaths = "${cfg.dataDir}";
ExecStartPost = let
restPort = toString cfg.restPort;
in [
# Run fully privileged for secrets dir write access
"+${nix-bitcoin-services.script ''
attempts=250
while ! { exec 3>/dev/tcp/127.0.0.1/${restPort} && exec 3>&-; } &>/dev/null; do
((attempts-- == 0)) && { echo "lnd REST service unreachable"; exit 1; }
sleep 0.1
done
mnemonic=${secretsDir}/lnd-seed-mnemonic
if [[ ! -f $mnemonic ]]; then
echo Create lnd seed
umask u=r,go=
${pkgs.curl}/bin/curl -s \
--cacert ${secretsDir}/lnd-cert \
-X GET https://127.0.0.1:${restPort}/v1/genseed | ${pkgs.jq}/bin/jq -c '.cipher_seed_mnemonic' > "$mnemonic"
fi
chown lnd: "$mnemonic"
''}"
"${nix-bitcoin-services.script ''
if [[ ! -f ${mainnetDir}/wallet.db ]]; then
echo Create lnd wallet
${pkgs.curl}/bin/curl -s --output /dev/null --show-error \
--cacert ${secretsDir}/lnd-cert \
-X POST -d "{\"wallet_password\": \"$(cat ${secretsDir}/lnd-wallet-password | tr -d '\n' | base64 -w0)\", \
\"cipher_seed_mnemonic\": $(cat ${secretsDir}/lnd-seed-mnemonic | tr -d '\n')}" \
https://127.0.0.1:${restPort}/v1/initwallet
# Guarantees that RPC calls with cfg.cli succeed after the service is started
echo Wait until wallet is created
while [[ ! -f ${mainnetDir}/admin.macaroon ]]; do
sleep 0.1
done
else
echo Unlock lnd wallet
${pkgs.curl}/bin/curl -s \
-H "Grpc-Metadata-macaroon: $(${pkgs.xxd}/bin/xxd -ps -u -c 99999 '${mainnetDir}/admin.macaroon')" \
--cacert ${secretsDir}/lnd-cert \
-X POST \
-d "{\"wallet_password\": \"$(cat ${secretsDir}/lnd-wallet-password | tr -d '\n' | base64 -w0)\"}" \
https://127.0.0.1:${restPort}/v1/unlockwallet
fi
# Wait until the RPC port is open
while ! { exec 3>/dev/tcp/127.0.0.1/${toString cfg.rpcPort}; } &>/dev/null; do
sleep 0.1
done
''}"
# Run fully privileged for chown
"+${nix-bitcoin-services.script ''
umask ug=r,o=
${lib.concatMapStrings (macaroon: ''
echo "Create custom macaroon ${macaroon}"
macaroonPath="$RUNTIME_DIRECTORY/${macaroon}.macaroon"
${pkgs.curl}/bin/curl -s \
-H "Grpc-Metadata-macaroon: $(${pkgs.xxd}/bin/xxd -ps -u -c 99999 '${mainnetDir}/admin.macaroon')" \
--cacert ${secretsDir}/lnd-cert \
-X POST \
-d '{"permissions":[${cfg.macaroons.${macaroon}.permissions}]}' \
https://127.0.0.1:${restPort}/v1/macaroon |\
${pkgs.jq}/bin/jq -c '.macaroon' | ${pkgs.xxd}/bin/xxd -p -r > "$macaroonPath"
chown ${cfg.macaroons.${macaroon}.user}: "$macaroonPath"
'') (attrNames cfg.macaroons)}
''}"
];
} // (if cfg.enforceTor
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then nix-bitcoin-services.allowTor
else nix-bitcoin-services.allowAnyIP
) // nix-bitcoin-services.allowAnyProtocol; # For ZMQ
};
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users.users.lnd = {
description = "LND User";
group = "lnd";
extraGroups = [ "bitcoinrpc" ];
home = cfg.dataDir; # lnd creates .lnd dir in HOME
};
users.groups.lnd = {};
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nix-bitcoin.operator = {
groups = [ "lnd" ];
sudoUsers = [ "lnd" ];
};
nix-bitcoin.secrets = {
lnd-wallet-password.user = "lnd";
lnd-key.user = "lnd";
lnd-cert.user = "lnd";
lnd-cert.permissions = "0444"; # world readable
};
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};
}