{ config, lib, pkgs, ... }: with lib; let cfg = config.services.envoy; format = pkgs.formats.json { }; conf = format.generate "envoy.json" cfg.settings; validateConfig = file: pkgs.runCommand "validate-envoy-conf" { } '' ${pkgs.envoy}/bin/envoy --log-level error --mode validate -c "${file}" cp "${file}" "$out" ''; in { options.services.envoy = { enable = mkEnableOption (lib.mdDoc "Envoy reverse proxy"); settings = mkOption { type = format.type; default = { }; example = literalExpression '' { admin = { access_log_path = "/dev/null"; address = { socket_address = { protocol = "TCP"; address = "127.0.0.1"; port_value = 9901; }; }; }; static_resources = { listeners = []; clusters = []; }; } ''; description = lib.mdDoc '' Specify the configuration for Envoy in Nix. ''; }; }; config = mkIf cfg.enable { environment.systemPackages = [ pkgs.envoy ]; systemd.services.envoy = { description = "Envoy reverse proxy"; after = [ "network-online.target" ]; requires = [ "network-online.target" ]; wantedBy = [ "multi-user.target" ]; serviceConfig = { ExecStart = "${pkgs.envoy}/bin/envoy -c ${validateConfig conf}"; DynamicUser = true; Restart = "no"; CacheDirectory = "envoy"; LogsDirectory = "envoy"; AmbientCapabilities = "CAP_NET_BIND_SERVICE"; CapabilityBoundingSet = "CAP_NET_BIND_SERVICE"; RestrictAddressFamilies = "AF_UNIX AF_INET AF_INET6 AF_NETLINK AF_XDP"; SystemCallArchitectures = "native"; LockPersonality = true; RestrictNamespaces = true; RestrictRealtime = true; PrivateUsers = false; # breaks CAP_NET_BIND_SERVICE PrivateDevices = true; ProtectClock = true; ProtectControlGroups = true; ProtectHome = true; ProtectKernelLogs = true; ProtectKernelModules = true; ProtectKernelTunables = true; ProtectProc = "ptraceable"; ProtectHostname = true; ProtectSystem = "strict"; UMask = "0066"; SystemCallFilter = "~@clock @module @mount @reboot @swap @obsolete @cpu-emulation"; }; }; }; }