159 lines
4.2 KiB
Nix
159 lines
4.2 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.nats;
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format = pkgs.formats.json { };
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configFile = format.generate "nats.conf" cfg.settings;
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in {
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### Interface
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options = {
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services.nats = {
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enable = mkEnableOption "NATS messaging system";
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user = mkOption {
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type = types.str;
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default = "nats";
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description = "User account under which NATS runs.";
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};
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group = mkOption {
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type = types.str;
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default = "nats";
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description = "Group under which NATS runs.";
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};
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serverName = mkOption {
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default = "nats";
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example = "n1-c3";
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type = types.str;
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description = ''
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Name of the NATS server, must be unique if clustered.
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'';
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};
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jetstream = mkEnableOption "JetStream";
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port = mkOption {
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default = 4222;
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example = 4222;
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type = types.port;
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description = ''
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Port on which to listen.
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'';
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};
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dataDir = mkOption {
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default = "/var/lib/nats";
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type = types.path;
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description = ''
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The NATS data directory. Only used if JetStream is enabled, for
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storing stream metadata and messages.
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If left as the default value this directory will automatically be
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created before the NATS server starts, otherwise the sysadmin is
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responsible for ensuring the directory exists with appropriate
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ownership and permissions.
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'';
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};
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settings = mkOption {
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default = { };
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type = format.type;
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example = literalExample ''
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{
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jetstream = {
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max_mem = "1G";
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max_file = "10G";
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};
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};
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'';
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description = ''
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Declarative NATS configuration. See the
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<link xlink:href="https://docs.nats.io/nats-server/configuration">
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NATS documentation</link> for a list of options.
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'';
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};
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};
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};
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### Implementation
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config = mkIf cfg.enable {
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services.nats.settings = {
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server_name = cfg.serverName;
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port = cfg.port;
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jetstream = optionalAttrs cfg.jetstream { store_dir = cfg.dataDir; };
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};
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systemd.services.nats = {
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description = "NATS messaging system";
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wantedBy = [ "multi-user.target" ];
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after = [ "network.target" ];
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serviceConfig = mkMerge [
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(mkIf (cfg.dataDir == "/var/lib/nats") {
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StateDirectory = "nats";
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StateDirectoryMode = "0750";
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})
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{
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Type = "simple";
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ExecStart = "${pkgs.nats-server}/bin/nats-server -c ${configFile}";
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ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
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ExecStop = "${pkgs.coreutils}/bin/kill -SIGINT $MAINPID";
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Restart = "on-failure";
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User = cfg.user;
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Group = cfg.group;
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# Hardening
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CapabilityBoundingSet = "";
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LimitNOFILE = 800000; # JetStream requires 2 FDs open per stream.
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LockPersonality = true;
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MemoryDenyWriteExecute = true;
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NoNewPrivileges = true;
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PrivateDevices = true;
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PrivateTmp = true;
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PrivateUsers = true;
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ProcSubset = "pid";
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ProtectClock = true;
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ProtectControlGroups = true;
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ProtectHome = true;
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ProtectHostname = true;
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ProtectKernelLogs = true;
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ProtectKernelModules = true;
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ProtectKernelTunables = true;
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ProtectProc = "invisible";
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ProtectSystem = "strict";
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ReadOnlyPaths = [ ];
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ReadWritePaths = [ cfg.dataDir ];
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RestrictAddressFamilies = [ "AF_INET" "AF_INET6" ];
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RestrictNamespaces = true;
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RestrictRealtime = true;
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RestrictSUIDSGID = true;
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SystemCallFilter = [ "@system-service" "~@privileged" "~@resources" ];
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UMask = "0077";
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}
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];
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};
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users.users = mkIf (cfg.user == "nats") {
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nats = {
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description = "NATS daemon user";
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isSystemUser = true;
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group = cfg.group;
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home = cfg.dataDir;
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};
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};
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users.groups = mkIf (cfg.group == "nats") { nats = { }; };
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};
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}
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