317 lines
11 KiB
Nix
317 lines
11 KiB
Nix
{ config, pkgs, lib, ... }:
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with lib;
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let
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cfg = config.services.bitcoind;
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inherit (config) nix-bitcoin-services;
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pidFile = "${cfg.dataDir}/bitcoind.pid";
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configFile = pkgs.writeText "bitcoin.conf" ''
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${optionalString cfg.testnet "testnet=1"}
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${optionalString (cfg.dbCache != null) "dbcache=${toString cfg.dbCache}"}
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${optionalString (cfg.prune != null) "prune=${toString cfg.prune}"}
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${optionalString (cfg.sysperms != null) "sysperms=${if cfg.sysperms then "1" else "0"}"}
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${optionalString (cfg.disablewallet != null) "disablewallet=${if cfg.disablewallet then "1" else "0"}"}
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# Connection options
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${optionalString (cfg.port != null) "port=${toString cfg.port}"}
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${optionalString (cfg.proxy != null) "proxy=${cfg.proxy}"}
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listen=${if cfg.listen then "1" else "0"}
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# RPC server options
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rpcport=${toString cfg.rpc.port}
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${concatMapStringsSep "\n"
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(rpcUser: "rpcauth=${rpcUser.name}:${rpcUser.passwordHMAC}")
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(attrValues cfg.rpc.users)
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}
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${optionalString (cfg.rpcuser != null) "rpcuser=${cfg.rpcuser}"}
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${optionalString (cfg.rpcpassword != null) "rpcpassword=${cfg.rpcpassword}"}
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# ZMQ options
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${optionalString (cfg.zmqpubrawblock != null) "zmqpubrawblock=${cfg.zmqpubrawblock}"}
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${optionalString (cfg.zmqpubrawtx != null) "zmqpubrawtx=${cfg.zmqpubrawtx}"}
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# Extra config options (from bitcoind nixos service)
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${cfg.extraConfig}
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'';
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cmdlineOptions = concatMapStringsSep " " (arg: "'${arg}'") [
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"-datadir=${cfg.dataDir}"
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"-pid=${pidFile}"
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];
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hexStr = types.strMatching "[0-9a-f]+";
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rpcUserOpts = { name, ... }: {
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options = {
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name = mkOption {
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type = types.str;
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example = "alice";
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description = ''
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Username for JSON-RPC connections.
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'';
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};
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passwordHMAC = mkOption {
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type = with types; uniq (strMatching "[0-9a-f]+\\$[0-9a-f]{64}");
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example = "f7efda5c189b999524f151318c0c86$d5b51b3beffbc02b724e5d095828e0bc8b2456e9ac8757ae3211a5d9b16a22ae";
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description = ''
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Password HMAC-SHA-256 for JSON-RPC connections. Must be a string of the
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format <SALT-HEX>$<HMAC-HEX>.
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'';
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};
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};
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config = {
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name = mkDefault name;
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};
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};
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in {
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options = {
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services.bitcoind = {
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enable = mkEnableOption "Bitcoin daemon";
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package = mkOption {
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type = types.package;
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default = pkgs.nix-bitcoin.bitcoind;
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defaultText = "pkgs.blockchains.bitcoind";
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description = "The package providing bitcoin binaries.";
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};
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extraConfig = mkOption {
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type = types.lines;
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default = "";
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example = ''
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par=16
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rpcthreads=16
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logips=1
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'';
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description = "Additional configurations to be appended to <filename>bitcoin.conf</filename>.";
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};
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dataDir = mkOption {
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type = types.path;
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default = "/var/lib/bitcoind";
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description = "The data directory for bitcoind.";
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};
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configFileOption = mkOption {
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type = types.path;
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default = configFile;
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description = "The data directory for bitcoind.";
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};
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user = mkOption {
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type = types.str;
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default = "bitcoin";
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description = "The user as which to run bitcoind.";
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};
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group = mkOption {
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type = types.str;
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default = cfg.user;
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description = "The group as which to run bitcoind.";
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};
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rpc = {
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port = mkOption {
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type = types.ints.u16;
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default = 8332;
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description = "Port on which to listen for JSON-RPC connections.";
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};
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users = mkOption {
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default = {};
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example = {
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alice.passwordHMAC = "f7efda5c189b999524f151318c0c86$d5b51b3beffbc02b724e5d095828e0bc8b2456e9ac8757ae3211a5d9b16a22ae";
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bob.passwordHMAC = "b2dd077cb54591a2f3139e69a897ac$4e71f08d48b4347cf8eff3815c0e25ae2e9a4340474079f55705f40574f4ec99";
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};
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type = with types; loaOf (submodule rpcUserOpts);
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description = ''
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RPC user information for JSON-RPC connnections.
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'';
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};
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};
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rpcuser = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = "Username for JSON-RPC connections";
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};
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rpcpassword = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = "Password for JSON-RPC connections";
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};
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testnet = mkOption {
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type = types.bool;
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default = false;
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description = "Whether to use the test chain.";
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};
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port = mkOption {
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type = types.nullOr types.ints.u16;
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default = null;
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description = "Override the default port on which to listen for connections.";
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};
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proxy = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = "Connect through SOCKS5 proxy";
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};
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listen = mkOption {
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type = types.bool;
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default = false;
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description = ''
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If enabled, the bitcoin service will listen.
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'';
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};
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sysperms = mkOption {
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type = types.nullOr types.bool;
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default = null;
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description = ''
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Create new files with system default permissions, instead of umask 077 (only effective with disabled wallet functionality)
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'';
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};
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disablewallet = mkOption {
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type = types.nullOr types.bool;
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default = null;
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description = ''
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Do not load the wallet and disable wallet RPC calls
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'';
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};
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dbCache = mkOption {
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type = types.nullOr (types.ints.between 4 16384);
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default = null;
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example = 4000;
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description = "Override the default database cache size in megabytes.";
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};
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prune = mkOption {
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type = types.nullOr (types.coercedTo
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(types.enum [ "disable" "manual" ])
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(x: if x == "disable" then 0 else 1)
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types.ints.unsigned
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);
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default = null;
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example = 10000;
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description = ''
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Reduce storage requirements by enabling pruning (deleting) of old
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blocks. This allows the pruneblockchain RPC to be called to delete
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specific blocks, and enables automatic pruning of old blocks if a
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target size in MiB is provided. This mode is incompatible with -txindex
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and -rescan. Warning: Reverting this setting requires re-downloading
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the entire blockchain. ("disable" = disable pruning blocks, "manual"
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= allow manual pruning via RPC, >=550 = automatically prune block files
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to stay under the specified target size in MiB)
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'';
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};
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zmqpubrawblock = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "tcp://127.0.0.1:28332";
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description = "ZMQ address for zmqpubrawblock notifications";
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};
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zmqpubrawtx = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "tcp://127.0.0.1:28333";
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description = "ZMQ address for zmqpubrawtx notifications";
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};
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cli = mkOption {
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type = types.package;
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readOnly = true;
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default = pkgs.writeScriptBin "bitcoin-cli" ''
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exec ${cfg.package}/bin/bitcoin-cli -datadir='${cfg.dataDir}' "$@"
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'';
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description = "Binary to connect with the bitcoind instance.";
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};
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enforceTor = nix-bitcoin-services.enforceTor;
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};
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};
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config = mkIf cfg.enable {
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environment.systemPackages = [ cfg.package ];
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systemd.services.bitcoind = {
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description = "Bitcoin daemon";
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requires = [ "nix-bitcoin-secrets.target" ];
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after = [ "network.target" "nix-bitcoin-secrets.target" ];
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wantedBy = [ "multi-user.target" ];
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preStart = ''
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if ! test -e ${cfg.dataDir}; then
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mkdir -m 0770 -p '${cfg.dataDir}'
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fi
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if ! test -e ${cfg.dataDir}/blocks; then
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mkdir -m 0770 -p '${cfg.dataDir}/blocks'
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fi
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cp '${cfg.configFileOption}' '${cfg.dataDir}/bitcoin.conf'
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chmod o-rw '${cfg.dataDir}/bitcoin.conf'
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chown -R '${cfg.user}:${cfg.group}' '${cfg.dataDir}'
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echo "rpcpassword=$(cat /secrets/bitcoin-rpcpassword)" >> '${cfg.dataDir}/bitcoin.conf'
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chmod -R g+rX '${cfg.dataDir}/blocks'
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'';
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# Wait until RPC port is open. This usually takes just a few ms.
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postStart = ''
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while ! { exec 3>/dev/tcp/127.0.0.1/${toString cfg.rpc.port}; } &>/dev/null; do
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sleep 0.05
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done
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'';
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serviceConfig = {
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Type = "simple";
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User = "${cfg.user}";
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Group = "${cfg.group}";
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ExecStart = "${cfg.package}/bin/bitcoind ${cmdlineOptions}";
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PIDFile = "${pidFile}";
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Restart = "on-failure";
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# Hardening measures
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PrivateTmp = "true";
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ProtectSystem = "full";
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NoNewPrivileges = "true";
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PrivateDevices = "true";
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MemoryDenyWriteExecute = "true";
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# Permission for preStart
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PermissionsStartOnly = "true";
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} // nix-bitcoin-services.defaultHardening
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// (if cfg.enforceTor
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then nix-bitcoin-services.allowTor
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else nix-bitcoin-services.allowAnyIP)
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// optionalAttrs (cfg.zmqpubrawblock != null || cfg.zmqpubrawtx != null) nix-bitcoin-services.allowAnyProtocol;
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};
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# Use this to update the banlist:
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# wget https://people.xiph.org/~greg/banlist.cli.txt
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systemd.services.bitcoind-import-banlist = {
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description = "Bitcoin daemon banlist importer";
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wantedBy = [ "bitcoind.service" ];
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bindsTo = [ "bitcoind.service" ];
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after = [ "bitcoind.service" ];
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script = ''
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cd ${cfg.cli}/bin
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# Poll until bitcoind accepts commands. This can take a long time.
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while ! ./bitcoin-cli getnetworkinfo &> /dev/null; do
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sleep 1
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done
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echo "Importing node banlist..."
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cat ${./banlist.cli.txt} | while read line; do
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if ! err=$(eval "$line" 2>&1) && [[ $err != *already\ banned* ]]; then
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# unexpected error
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echo "$err"
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exit 1
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fi
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done
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'';
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serviceConfig = {
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User = "${cfg.user}";
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Group = "${cfg.group}";
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} // nix-bitcoin-services.defaultHardening
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// nix-bitcoin-services.allowTor;
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};
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users.users.${cfg.user} = {
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group = cfg.group;
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description = "Bitcoin daemon user";
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home = cfg.dataDir;
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};
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users.groups.${cfg.group} = {};
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users.groups.bitcoinrpc = {};
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nix-bitcoin.secrets.bitcoin-rpcpassword = {
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user = "bitcoin";
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group = "bitcoinrpc";
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};
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};
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}
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