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nixos/endlessh: init module

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Azat Bahawi 2022-10-22 15:53:35 +03:00
parent 5040cb7657
commit 76ccbea152
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7 changed files with 170 additions and 3 deletions

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@ -314,6 +314,13 @@
<link linkend="opt-services.alps.enable">services.alps</link>.
</para>
</listitem>
<listitem>
<para>
<link xlink:href="https://github.com/skeeto/endlessh">endlessh</link>,
an SSH tarpit. Available as
<link linkend="opt-services.endlessh.enable">services.endlessh</link>.
</para>
</listitem>
<listitem>
<para>
<link xlink:href="https://github.com/shizunge/endlessh-go">endlessh-go</link>,

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@ -114,6 +114,8 @@ In addition to numerous new and upgraded packages, this release has the followin
- [alps](https://git.sr.ht/~migadu/alps), a simple and extensible webmail. Available as [services.alps](#opt-services.alps.enable).
- [endlessh](https://github.com/skeeto/endlessh), an SSH tarpit. Available as [services.endlessh](#opt-services.endlessh.enable).
- [endlessh-go](https://github.com/shizunge/endlessh-go), an SSH tarpit that exposes Prometheus metrics. Available as [services.endlessh-go](#opt-services.endlessh-go.enable).
- [netbird](https://netbird.io), a zero configuration VPN.

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@ -1009,6 +1009,7 @@
./services/security/certmgr.nix
./services/security/cfssl.nix
./services/security/clamav.nix
./services/security/endlessh.nix
./services/security/endlessh-go.nix
./services/security/fail2ban.nix
./services/security/fprintd.nix

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@ -0,0 +1,99 @@
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.endlessh;
in
{
options.services.endlessh = {
enable = mkEnableOption (mdDoc "endlessh service");
port = mkOption {
type = types.port;
default = 2222;
example = 22;
description = mdDoc ''
Specifies on which port the endlessh daemon listens for SSH
connections.
Setting this to `22` may conflict with {option}`services.openssh`.
'';
};
extraOptions = mkOption {
type = with types; listOf str;
default = [ ];
example = [ "-6" "-d 9000" "-v" ];
description = mdDoc ''
Additional command line options to pass to the endlessh daemon.
'';
};
openFirewall = mkOption {
type = types.bool;
default = false;
description = lib.mdDoc ''
Whether to open a firewall port for the SSH listener.
'';
};
};
config = mkIf cfg.enable {
systemd.services.endlessh = {
description = "SSH tarpit";
requires = [ "network.target" ];
wantedBy = [ "multi-user.target" ];
serviceConfig =
let
needsPrivileges = cfg.port < 1024;
capabilities = [ "" ] ++ optionals needsPrivileges [ "CAP_NET_BIND_SERVICE" ];
rootDirectory = "/run/endlessh";
in
{
Restart = "always";
ExecStart = with cfg; concatStringsSep " " ([
"${pkgs.endlessh}/bin/endlessh"
"-p ${toString port}"
] ++ extraOptions);
DynamicUser = true;
RootDirectory = rootDirectory;
BindReadOnlyPaths = [ builtins.storeDir ];
InaccessiblePaths = [ "-+${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" "~@resources" "~@privileged" ];
};
};
networking.firewall.allowedTCPPorts = with cfg;
optionals openFirewall [ port ];
};
meta.maintainers = with maintainers; [ azahi ];
}

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@ -180,6 +180,7 @@ in {
ejabberd = handleTest ./xmpp/ejabberd.nix {};
elk = handleTestOn ["x86_64-linux"] ./elk.nix {};
emacs-daemon = handleTest ./emacs-daemon.nix {};
endlessh = handleTest ./endlessh.nix {};
endlessh-go = handleTest ./endlessh-go.nix {};
engelsystem = handleTest ./engelsystem.nix {};
enlightenment = handleTest ./enlightenment.nix {};

43
nixos/tests/endlessh.nix Normal file
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@ -0,0 +1,43 @@
import ./make-test-python.nix ({ lib, pkgs, ... }:
{
name = "endlessh";
meta.maintainers = with lib.maintainers; [ azahi ];
nodes = {
server = { ... }: {
services.endlessh = {
enable = true;
openFirewall = true;
};
specialisation = {
unprivileged.configuration.services.endlessh.port = 2222;
privileged.configuration.services.endlessh.port = 22;
};
};
client = { pkgs, ... }: {
environment.systemPackages = with pkgs; [ curl netcat ];
};
};
testScript = ''
def activate_specialisation(name: str):
server.succeed(f"/run/booted-system/specialisation/{name}/bin/switch-to-configuration test >&2")
start_all()
with subtest("Unprivileged"):
activate_specialisation("unprivileged")
server.wait_for_unit("endlessh.service")
server.wait_for_open_port(2222)
client.succeed("nc -dvW5 server 2222")
with subtest("Privileged"):
activate_specialisation("privileged")
server.wait_for_unit("endlessh.service")
server.wait_for_open_port(22)
client.succeed("nc -dvW5 server 22")
'';
})

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@ -1,4 +1,10 @@
{ lib, stdenv, fetchFromGitHub }:
{ lib
, stdenv
, fetchFromGitHub
, testers
, endlessh
, nixosTests
}:
stdenv.mkDerivation rec {
pname = "endlessh";
@ -8,17 +14,25 @@ stdenv.mkDerivation rec {
owner = "skeeto";
repo = pname;
rev = version;
sha256 = "0ziwr8j1frsp3dajr8h5glkm1dn5cci404kazz5w1jfrp0736x68";
hash = "sha256-yHQzDrjZycDL/2oSQCJjxbZQJ30FoixVG1dnFyTKPH4=";
};
makeFlags = [ "PREFIX=$(out)" ];
passthru.tests = {
inherit (nixosTests) endlessh;
version = testers.testVersion {
package = endlessh;
command = "endlessh -V";
};
};
meta = with lib; {
description = "SSH tarpit that slowly sends an endless banner";
homepage = "https://github.com/skeeto/endlessh";
changelog = "https://github.com/skeeto/endlessh/releases/tag/${version}";
license = licenses.unlicense;
maintainers = [ maintainers.marsam ];
maintainers = with maintainers; [ azahi marsam ];
platforms = platforms.unix;
};
}