138 lines
4 KiB
Nix
138 lines
4 KiB
Nix
{ config, lib, pkgs, ... }:
|
|
|
|
with lib;
|
|
|
|
let
|
|
cfg = config.services.endlessh-go;
|
|
in
|
|
{
|
|
options.services.endlessh-go = {
|
|
enable = mkEnableOption "endlessh-go service";
|
|
|
|
listenAddress = mkOption {
|
|
type = types.str;
|
|
default = "0.0.0.0";
|
|
example = "[::]";
|
|
description = ''
|
|
Interface address to bind the endlessh-go daemon to SSH connections.
|
|
'';
|
|
};
|
|
|
|
port = mkOption {
|
|
type = types.port;
|
|
default = 2222;
|
|
example = 22;
|
|
description = ''
|
|
Specifies on which port the endlessh-go daemon listens for SSH
|
|
connections.
|
|
|
|
Setting this to `22` may conflict with {option}`services.openssh`.
|
|
'';
|
|
};
|
|
|
|
prometheus = {
|
|
enable = mkEnableOption "Prometheus integration";
|
|
|
|
listenAddress = mkOption {
|
|
type = types.str;
|
|
default = "0.0.0.0";
|
|
example = "[::]";
|
|
description = ''
|
|
Interface address to bind the endlessh-go daemon to answer Prometheus
|
|
queries.
|
|
'';
|
|
};
|
|
|
|
port = mkOption {
|
|
type = types.port;
|
|
default = 2112;
|
|
example = 9119;
|
|
description = ''
|
|
Specifies on which port the endlessh-go daemon listens for Prometheus
|
|
queries.
|
|
'';
|
|
};
|
|
};
|
|
|
|
extraOptions = mkOption {
|
|
type = with types; listOf str;
|
|
default = [ ];
|
|
example = [ "-conn_type=tcp4" "-max_clients=8192" ];
|
|
description = ''
|
|
Additional command line options to pass to the endlessh-go daemon.
|
|
'';
|
|
};
|
|
|
|
openFirewall = mkOption {
|
|
type = types.bool;
|
|
default = false;
|
|
description = ''
|
|
Whether to open a firewall port for the SSH listener.
|
|
'';
|
|
};
|
|
};
|
|
|
|
config = mkIf cfg.enable {
|
|
systemd.services.endlessh-go = {
|
|
description = "SSH tarpit";
|
|
requires = [ "network.target" ];
|
|
wantedBy = [ "multi-user.target" ];
|
|
serviceConfig =
|
|
let
|
|
needsPrivileges = cfg.port < 1024 || cfg.prometheus.port < 1024;
|
|
capabilities = [ "" ] ++ optionals needsPrivileges [ "CAP_NET_BIND_SERVICE" ];
|
|
rootDirectory = "/run/endlessh-go";
|
|
in
|
|
{
|
|
Restart = "always";
|
|
ExecStart = with cfg; concatStringsSep " " ([
|
|
"${pkgs.endlessh-go}/bin/endlessh-go"
|
|
"-logtostderr"
|
|
"-host=${listenAddress}"
|
|
"-port=${toString port}"
|
|
] ++ optionals prometheus.enable [
|
|
"-enable_prometheus"
|
|
"-prometheus_host=${prometheus.listenAddress}"
|
|
"-prometheus_port=${toString prometheus.port}"
|
|
] ++ extraOptions);
|
|
DynamicUser = true;
|
|
RootDirectory = rootDirectory;
|
|
BindReadOnlyPaths = [ builtins.storeDir ];
|
|
InaccessiblePaths = [ "-+${rootDirectory}" ];
|
|
RuntimeDirectory = baseNameOf rootDirectory;
|
|
RuntimeDirectoryMode = "700";
|
|
AmbientCapabilities = capabilities;
|
|
CapabilityBoundingSet = capabilities;
|
|
UMask = "0077";
|
|
LockPersonality = true;
|
|
MemoryDenyWriteExecute = true;
|
|
NoNewPrivileges = true;
|
|
PrivateDevices = true;
|
|
PrivateTmp = true;
|
|
PrivateUsers = !needsPrivileges;
|
|
ProtectClock = true;
|
|
ProtectControlGroups = true;
|
|
ProtectHome = true;
|
|
ProtectHostname = true;
|
|
ProtectKernelLogs = true;
|
|
ProtectKernelModules = true;
|
|
ProtectKernelTunables = true;
|
|
ProtectSystem = "strict";
|
|
ProtectProc = "noaccess";
|
|
ProcSubset = "pid";
|
|
RemoveIPC = true;
|
|
RestrictAddressFamilies = [ "AF_INET" "AF_INET6" ];
|
|
RestrictNamespaces = true;
|
|
RestrictRealtime = true;
|
|
RestrictSUIDSGID = true;
|
|
SystemCallArchitectures = "native";
|
|
SystemCallFilter = [ "@system-service" "~@privileged" ];
|
|
};
|
|
};
|
|
|
|
networking.firewall.allowedTCPPorts = with cfg;
|
|
optionals openFirewall [ port prometheus.port ];
|
|
};
|
|
|
|
meta.maintainers = with maintainers; [ azahi ];
|
|
}
|