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|
{ config, pkgs, lib, ... }:
with lib;
let
cfg = config.services.bitcoind;
pidFile = "${cfg.dataDir}/bitcoind.pid";
configFile = pkgs.writeText "bitcoin.conf" ''
${optionalString cfg.testnet "testnet=1"}
${optionalString (cfg.dbCache != null) "dbcache=${toString cfg.dbCache}"}
${optionalString (cfg.prune != null) "prune=${toString cfg.prune}"}
# Connection options
${optionalString (cfg.port != null) "port=${toString cfg.port}"}
# RPC server options
${optionalString (cfg.rpc.port != null) "rpcport=${toString cfg.rpc.port}"}
${concatMapStringsSep "\n"
(rpcUser: "rpcauth=${rpcUser.name}:${rpcUser.passwordHMAC}")
(attrValues cfg.rpc.users)
}
# Extra config options (from bitcoind nixos service)
${cfg.extraConfig}
'';
cmdlineOptions = escapeShellArgs [
"-conf=${cfg.configFile}"
"-datadir=${cfg.dataDir}"
"-pid=${pidFile}"
];
rpcUserOpts = { name, ... }: {
options = {
name = mkOption {
type = types.str;
example = "alice";
description = ''
Username for JSON-RPC connections.
'';
};
passwordHMAC = mkOption {
type = with types; uniq (strMatching "[0-9a-f]+\\$[0-9a-f]{64}");
example = "f7efda5c189b999524f151318c0c86$d5b51b3beffbc02b724e5d095828e0bc8b2456e9ac8757ae3211a5d9b16a22ae";
description = ''
Password HMAC-SHA-256 for JSON-RPC connections. Must be a string of the
format <SALT-HEX>$<HMAC-HEX>.
'';
};
};
config = {
name = mkDefault name;
};
};
in {
options = {
services.bitcoind = {
enable = mkEnableOption "Bitcoin daemon";
package = mkOption {
type = types.package;
default = pkgs.bitcoind;
defaultText = "pkgs.bitcoind";
description = "The package providing bitcoin binaries.";
};
configFile = mkOption {
type = types.path;
default = configFile;
example = "/etc/bitcoind.conf";
description = "The configuration file path to supply bitcoind.";
};
extraConfig = mkOption {
type = types.lines;
default = "";
example = ''
par=16
rpcthreads=16
logips=1
'';
description = "Additional configurations to be appended to <filename>bitcoin.conf</filename>.";
};
dataDir = mkOption {
type = types.path;
default = "/var/lib/bitcoind";
description = "The data directory for bitcoind.";
};
user = mkOption {
type = types.str;
default = "bitcoin";
description = "The user as which to run bitcoind.";
};
group = mkOption {
type = types.str;
default = cfg.user;
description = "The group as which to run bitcoind.";
};
rpc = {
port = mkOption {
type = types.nullOr types.port;
default = null;
description = "Override the default port on which to listen for JSON-RPC connections.";
};
users = mkOption {
default = {};
example = literalExample ''
{
alice.passwordHMAC = "f7efda5c189b999524f151318c0c86$d5b51b3beffbc02b724e5d095828e0bc8b2456e9ac8757ae3211a5d9b16a22ae";
bob.passwordHMAC = "b2dd077cb54591a2f3139e69a897ac$4e71f08d48b4347cf8eff3815c0e25ae2e9a4340474079f55705f40574f4ec99";
}
'';
type = with types; loaOf (submodule rpcUserOpts);
description = ''
RPC user information for JSON-RPC connnections.
'';
};
};
testnet = mkOption {
type = types.bool;
default = false;
description = "Whether to use the test chain.";
};
port = mkOption {
type = types.nullOr types.port;
default = null;
description = "Override the default port on which to listen for connections.";
};
dbCache = mkOption {
type = types.nullOr (types.ints.between 4 16384);
default = null;
example = 4000;
description = "Override the default database cache size in megabytes.";
};
prune = mkOption {
type = types.nullOr (types.coercedTo
(types.enum [ "disable" "manual" ])
(x: if x == "disable" then 0 else 1)
types.ints.unsigned
);
default = null;
example = 10000;
description = ''
Reduce storage requirements by enabling pruning (deleting) of old
blocks. This allows the pruneblockchain RPC to be called to delete
specific blocks, and enables automatic pruning of old blocks if a
target size in MiB is provided. This mode is incompatible with -txindex
and -rescan. Warning: Reverting this setting requires re-downloading
the entire blockchain. ("disable" = disable pruning blocks, "manual"
= allow manual pruning via RPC, >=550 = automatically prune block files
to stay under the specified target size in MiB)
'';
};
};
};
config = mkIf cfg.enable {
environment.systemPackages = [ cfg.package ];
systemd.tmpfiles.rules = [
"d '${cfg.dataDir}' 0770 '${cfg.user}' '${cfg.group}' - -"
"L '${cfg.dataDir}/bitcoin.conf' - - - - '${cfg.configFile}'"
];
systemd.services.bitcoind = {
description = "Bitcoin daemon";
after = [ "network.target" ];
wantedBy = [ "multi-user.target" ];
serviceConfig = {
User = cfg.user;
Group = cfg.group;
ExecStart = "${cfg.package}/bin/bitcoind ${cmdlineOptions}";
Restart = "on-failure";
# Hardening measures
PrivateTmp = "true";
ProtectSystem = "full";
NoNewPrivileges = "true";
PrivateDevices = "true";
MemoryDenyWriteExecute = "true";
};
};
users.users.${cfg.user} = {
name = cfg.user;
group = cfg.group;
description = "Bitcoin daemon user";
home = cfg.dataDir;
isSystemUser = true;
};
users.groups.${cfg.group} = {
name = cfg.group;
};
};
}
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