nix-bitcoin/modules/joinmarket.nix

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2020-04-23 09:18:47 -07:00
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.joinmarket;
inherit (config) nix-bitcoin-services;
secretsDir = config.nix-bitcoin.secretsDir;
torAddress = builtins.head (builtins.split ":" config.services.tor.client.socksListenAddress);
configFile = builtins.toFile "config" ''
# Based on https://github.com/JoinMarket-Org/joinmarket-clientserver/blob/master/jmclient/jmclient/configure.py
[DAEMON]
no_daemon = 0
daemon_port = 27183
daemon_host = localhost
use_ssl = false
[BLOCKCHAIN]
blockchain_source = bitcoin-rpc
network = mainnet
rpc_host = ${builtins.elemAt config.services.bitcoind.rpcbind 0}
rpc_port = 8332
rpc_user = ${config.services.bitcoind.rpc.users.privileged.name}
@@RPC_PASSWORD@@
[MESSAGING:server1]
host = darksci3bfoka7tw.onion
channel = joinmarket-pit
port = 6697
usessl = true
socks5 = true
socks5_host = ${torAddress}
socks5_port = 9050
[MESSAGING:server2]
host = ncwkrwxpq2ikcngxq3dy2xctuheniggtqeibvgofixpzvrwpa77tozqd.onion
channel = joinmarket-pit
port = 6667
usessl = false
socks5 = true
socks5_host = ${torAddress}
socks5_port = 9050
[LOGGING]
console_log_level = INFO
color = false
[POLICY]
segwit = true
native = false
merge_algorithm = default
tx_fees = 3
absurd_fee_per_kb = 350000
tx_broadcast = self
minimum_makers = 4
max_sats_freeze_reuse = -1
taker_utxo_retries = 3
taker_utxo_age = 5
taker_utxo_amtpercent = 20
accept_commitment_broadcasts = 1
commit_file_location = cmtdata/commitments.json
'';
# The jm scripts create a 'logs' dir in the working dir,
# so run them inside dataDir.
cli = pkgs.runCommand "joinmarket-cli" {} ''
mkdir -p $out/bin
jm=${pkgs.nix-bitcoin.joinmarket}/bin
cd $jm
for bin in jm-*; do
{
echo "#!${pkgs.bash}/bin/bash";
echo "cd '${cfg.dataDir}' && ${cfg.cliExec} sudo -u ${cfg.user} $jm/$bin --datadir='${cfg.dataDir}' \"\$@\"";
} > $out/bin/$bin
done
chmod -R +x $out/bin
'';
in {
options.services.joinmarket = {
enable = mkEnableOption "JoinMarket";
yieldgenerator = {
enable = mkEnableOption "yield generator bot";
customParameters = mkOption {
type = types.str;
default = "";
example = ''
txfee = 200
cjfee_a = 300
'';
description = ''
Python code to define custom yield generator parameters, as described in
https://github.com/JoinMarket-Org/joinmarket-clientserver/blob/master/docs/YIELDGENERATOR.md
'';
};
};
dataDir = mkOption {
type = types.path;
default = "/var/lib/joinmarket";
description = "The data directory for JoinMarket.";
};
user = mkOption {
type = types.str;
default = "joinmarket";
description = "The user as which to run JoinMarket.";
};
group = mkOption {
type = types.str;
default = cfg.user;
description = "The group as which to run JoinMarket.";
};
cli = mkOption {
default = cli;
};
inherit (nix-bitcoin-services) cliExec;
};
config = mkIf cfg.enable (mkMerge [{
environment.systemPackages = [
(hiPrio cfg.cli)
];
users.users.${cfg.user} = {
description = "joinmarket User";
group = "${cfg.group}";
home = cfg.dataDir;
};
users.groups.${cfg.group} = {};
systemd.tmpfiles.rules = [
"d '${cfg.dataDir}' 0770 ${cfg.user} ${cfg.group} - -"
];
services.bitcoind.disablewallet = false;
# Joinmarket is TOR-only
services.tor = {
enable = true;
client.enable = true;
};
systemd.services.joinmarket = {
description = "JoinMarket Daemon";
wantedBy = [ "multi-user.target" ];
requires = [ "bitcoind.service" ];
after = [ "bitcoind.service" ];
path = [ pkgs.sudo ];
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serviceConfig = nix-bitcoin-services.defaultHardening // {
ExecStartPre = nix-bitcoin-services.privileged ''
install -o '${cfg.user}' -g '${cfg.group}' -m 640 ${configFile} ${cfg.dataDir}/joinmarket.cfg
sed -i \
"s|@@RPC_PASSWORD@@|rpc_password = $(cat ${secretsDir}/bitcoin-rpcpassword-privileged)|" \
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'${cfg.dataDir}/joinmarket.cfg'
'';
ExecStartPost = nix-bitcoin-services.privileged ''
walletname=wallet.jmdat
pw=$(cat "${secretsDir}"/jm-wallet-password)
mnemonic=${secretsDir}/jm-wallet-seed
if [[ ! -f ${cfg.dataDir}/wallets/$walletname ]]; then
echo Create joinmarket wallet
# Use bash variables so commands don't proceed on previous failures
# (like with pipes)
cd ${cfg.dataDir} && \
out=$(sudo -u ${cfg.user} \
${pkgs.nix-bitcoin.joinmarket}/bin/jm-genwallet \
--datadir=${cfg.dataDir} $walletname $pw)
recoveryseed=$(echo "$out" | grep 'recovery_seed')
echo "$recoveryseed" | cut -d ':' -f2 > $mnemonic
fi
'';
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ExecStart = "${pkgs.nix-bitcoin.joinmarket}/bin/joinmarketd";
WorkingDirectory = "${cfg.dataDir}"; # The service creates 'commitmentlist' in the working dir
User = "${cfg.user}";
Restart = "on-failure";
RestartSec = "10s";
ReadWritePaths = "${cfg.dataDir}";
} // nix-bitcoin-services.allowTor;
};
}
(mkIf cfg.yieldgenerator.enable {
nix-bitcoin.secrets.jm-wallet-password.user = cfg.user;
systemd.services.joinmarket-yieldgenerator = let
ygDefault = "${pkgs.nix-bitcoin.joinmarket}/bin/jm-yg-privacyenhanced";
ygBinary = if cfg.yieldgenerator.customParameters == "" then
ygDefault
else
pkgs.runCommand "jm-yieldgenerator-custom" {
inherit (cfg.yieldgenerator) customParameters;
} ''
substitute ${ygDefault} $out \
--replace "# end of settings customization" "$customParameters"
chmod +x $out
'';
in {
description = "CoinJoin maker bot to gain privacy and passively generate income";
wantedBy = [ "joinmarket.service" ];
requires = [ "joinmarket.service" ];
after = [ "joinmarket.service" ];
preStart = let
start = ''
exec ${ygBinary} --datadir='${cfg.dataDir}' --wallet-password-stdin wallet.jmdat
'';
in ''
pw=$(cat "${secretsDir}"/jm-wallet-password)
echo "echo -n $pw | ${start}" > $RUNTIME_DIRECTORY/start
'';
serviceConfig = nix-bitcoin-services.defaultHardening // rec {
RuntimeDirectory = "joinmarket-yieldgenerator"; # Only used to create start script
RuntimeDirectoryMode = "700";
WorkingDirectory = "${cfg.dataDir}"; # The service creates dir 'logs' in the working dir
ExecStart = "${pkgs.bash}/bin/bash /run/${RuntimeDirectory}/start";
User = "${cfg.user}";
ReadWritePaths = "${cfg.dataDir}";
} // nix-bitcoin-services.allowTor;
};
})
]);
}