99 lines
2.9 KiB
Nix
99 lines
2.9 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.endlessh;
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in
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{
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options.services.endlessh = {
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enable = mkEnableOption "endlessh service";
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port = mkOption {
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type = types.port;
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default = 2222;
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example = 22;
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description = ''
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Specifies on which port the endlessh daemon listens for SSH
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connections.
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Setting this to `22` may conflict with {option}`services.openssh`.
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'';
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};
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extraOptions = mkOption {
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type = with types; listOf str;
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default = [ ];
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example = [ "-6" "-d 9000" "-v" ];
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description = ''
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Additional command line options to pass to the endlessh daemon.
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'';
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};
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openFirewall = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to open a firewall port for the SSH listener.
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'';
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};
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};
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config = mkIf cfg.enable {
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systemd.services.endlessh = {
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description = "SSH tarpit";
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requires = [ "network.target" ];
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wantedBy = [ "multi-user.target" ];
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serviceConfig =
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let
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needsPrivileges = cfg.port < 1024;
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capabilities = [ "" ] ++ optionals needsPrivileges [ "CAP_NET_BIND_SERVICE" ];
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rootDirectory = "/run/endlessh";
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in
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{
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Restart = "always";
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ExecStart = with cfg; concatStringsSep " " ([
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"${pkgs.endlessh}/bin/endlessh"
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"-p ${toString port}"
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] ++ extraOptions);
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DynamicUser = true;
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RootDirectory = rootDirectory;
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BindReadOnlyPaths = [ builtins.storeDir ];
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InaccessiblePaths = [ "-+${rootDirectory}" ];
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RuntimeDirectory = baseNameOf rootDirectory;
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RuntimeDirectoryMode = "700";
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AmbientCapabilities = capabilities;
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CapabilityBoundingSet = capabilities;
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UMask = "0077";
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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 = !needsPrivileges;
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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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ProtectSystem = "strict";
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ProtectProc = "noaccess";
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ProcSubset = "pid";
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RemoveIPC = true;
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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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SystemCallArchitectures = "native";
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SystemCallFilter = [ "@system-service" "~@resources" "~@privileged" ];
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};
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};
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networking.firewall.allowedTCPPorts = with cfg;
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optionals openFirewall [ port ];
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};
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meta.maintainers = with maintainers; [ azahi ];
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}
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