nix-bitcoin/modules/clightning.nix

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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.clightning;
inherit (config) nix-bitcoin-services;
onion-chef-service = (if cfg.announce-tor then [ "onion-chef.service" ] else []);
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configFile = pkgs.writeText "config" ''
network=bitcoin
bitcoin-datadir=${config.services.bitcoind.dataDir}
${optionalString (cfg.proxy != null) "proxy=${cfg.proxy}"}
always-use-proxy=${if cfg.always-use-proxy then "true" else "false"}
${optionalString (cfg.bind-addr != null) "bind-addr=${cfg.bind-addr}:${toString cfg.bindport}"}
${optionalString (cfg.bitcoin-rpcconnect != null) "bitcoin-rpcconnect=${cfg.bitcoin-rpcconnect}"}
bitcoin-rpcuser=${config.services.bitcoind.rpc.users.public.name}
rpc-file-mode=0660
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'';
in {
options.services.clightning = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
If enabled, the clightning service will be installed.
'';
};
autolisten = mkOption {
type = types.bool;
default = false;
description = ''
Bind (and maybe announce) on IPv4 and IPv6 interfaces if no addr,
bind-addr or announce-addr options are specified.
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'';
};
proxy = mkOption {
type = types.nullOr types.str;
default = null;
description = "Set a socks proxy to use to connect to Tor nodes (or for all connections if *always-use-proxy* is set)";
};
always-use-proxy = mkOption {
type = types.bool;
default = false;
description = ''
Always use the *proxy*, even to connect to normal IP addresses (you can still connect to Unix domain sockets manually). This also disables all DNS lookups, to avoid leaking information.
'';
};
bind-addr = mkOption {
type = pkgs.nix-bitcoin.lib.ipv4Address;
default = "127.0.0.1";
description = "Set an IP address or UNIX domain socket to listen to";
};
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bindport = mkOption {
type = types.port;
default = 9735;
description = "Set a Port to listen to locally";
};
announce-tor = mkOption {
type = types.bool;
default = false;
description = "Announce clightning Tor Hidden Service";
};
bitcoin-rpcconnect = mkOption {
type = types.nullOr types.str;
default = null;
description = "The bitcoind RPC host to connect to.";
};
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dataDir = mkOption {
type = types.path;
default = "/var/lib/clightning";
description = "The data directory for clightning.";
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};
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user = mkOption {
type = types.str;
default = "clightning";
description = "The user as which to run clightning.";
};
group = mkOption {
type = types.str;
default = cfg.user;
description = "The group as which to run clightning.";
};
cli = mkOption {
readOnly = true;
default = pkgs.writeScriptBin "lightning-cli"
''
${pkgs.nix-bitcoin.clightning}/bin/lightning-cli --lightning-dir='${cfg.dataDir}' "$@"
'';
description = "Binary to connect with the clightning instance.";
};
enforceTor = nix-bitcoin-services.enforceTor;
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};
config = mkIf cfg.enable {
environment.systemPackages = [ pkgs.nix-bitcoin.clightning (hiPrio cfg.cli) ];
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users.users.${cfg.user} = {
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description = "clightning User";
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group = cfg.group;
extraGroups = [ "bitcoinrpc" ];
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};
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users.groups.${cfg.group} = {};
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systemd.tmpfiles.rules = [
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"d '${cfg.dataDir}' 0770 ${cfg.user} ${cfg.group} - -"
];
services.onion-chef.access.clightning = if cfg.announce-tor then [ "clightning" ] else [];
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systemd.services.clightning = {
description = "Run clightningd";
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 = ''
cp ${configFile} ${cfg.dataDir}/config
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chown -R '${cfg.user}:${cfg.group}' '${cfg.dataDir}'
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# The RPC socket has to be removed otherwise we might have stale sockets
rm -f ${cfg.dataDir}/bitcoin/lightning-rpc
chmod 600 ${cfg.dataDir}/config
echo "bitcoin-rpcpassword=$(cat ${config.nix-bitcoin.secretsDir}/bitcoin-rpcpassword-public)" >> '${cfg.dataDir}/config'
${optionalString cfg.announce-tor "echo announce-addr=$(cat /var/lib/onion-chef/clightning/clightning) >> '${cfg.dataDir}/config'"}
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'';
serviceConfig = nix-bitcoin-services.defaultHardening // {
ExecStart = "${pkgs.nix-bitcoin.clightning}/bin/lightningd --lightning-dir=${cfg.dataDir}";
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User = "${cfg.user}";
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Restart = "on-failure";
RestartSec = "10s";
ReadWritePaths = "${cfg.dataDir}";
} // (if cfg.enforceTor
then nix-bitcoin-services.allowTor
else nix-bitcoin-services.allowAnyIP
);
# Wait until the rpc socket appears
postStart = ''
while [[ ! -e ${cfg.dataDir}/bitcoin/lightning-rpc ]]; do
sleep 0.1
done
# Needed to enable lightning-cli for users with group 'clightning'
chmod g+x ${cfg.dataDir}/bitcoin
'';
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};
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};
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}