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|
{ 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 "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";
};
};
};
}
|