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|
{
config,
lib,
pkgs,
...
}:
let
cfg = config.services.envoy;
format = pkgs.formats.json { };
conf = format.generate "envoy.json" cfg.settings;
validateConfig =
required: file:
pkgs.runCommand "validate-envoy-conf" { } ''
${cfg.package}/bin/envoy --log-level error --mode validate -c "${file}" ${
lib.optionalString (!required) "|| true"
}
cp "${file}" "$out"
'';
in
{
options.services.envoy = {
enable = lib.mkEnableOption "Envoy reverse proxy";
package = lib.mkPackageOption pkgs "envoy" { };
requireValidConfig = lib.mkOption {
type = lib.types.bool;
default = true;
description = ''
Whether a failure during config validation at build time is fatal.
When the config can't be checked during build time, for example when it includes
other files, disable this option.
'';
};
settings = lib.mkOption {
type = format.type;
default = { };
example = lib.literalExpression ''
{
admin = {
access_log_path = "/dev/null";
address = {
socket_address = {
protocol = "TCP";
address = "127.0.0.1";
port_value = 9901;
};
};
};
static_resources = {
listeners = [];
clusters = [];
};
}
'';
description = ''
Specify the configuration for Envoy in Nix.
'';
};
};
config = lib.mkIf cfg.enable {
environment.systemPackages = [ cfg.package ];
systemd.services.envoy = {
description = "Envoy reverse proxy";
after = [ "network-online.target" ];
requires = [ "network-online.target" ];
wantedBy = [ "multi-user.target" ];
serviceConfig = {
ExecStart = "${cfg.package}/bin/envoy -c ${validateConfig cfg.requireValidConfig conf}";
CacheDirectory = [ "envoy" ];
LogsDirectory = [ "envoy" ];
Restart = "no";
# Hardening
AmbientCapabilities = [ "CAP_NET_BIND_SERVICE" ];
CapabilityBoundingSet = [ "CAP_NET_BIND_SERVICE" ];
DeviceAllow = [ "" ];
DevicePolicy = "closed";
DynamicUser = true;
LockPersonality = true;
MemoryDenyWriteExecute = false; # at least wasmr needs WX permission
PrivateDevices = true;
PrivateUsers = false; # breaks CAP_NET_BIND_SERVICE
ProcSubset = "pid";
ProtectClock = true;
ProtectControlGroups = true;
ProtectHome = true;
ProtectHostname = true;
ProtectKernelLogs = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
ProtectProc = "ptraceable";
ProtectSystem = "strict";
RestrictAddressFamilies = [
"AF_UNIX"
"AF_INET"
"AF_INET6"
"AF_NETLINK"
"AF_XDP"
];
RestrictNamespaces = true;
RestrictRealtime = true;
SystemCallArchitectures = "native";
SystemCallErrorNumber = "EPERM";
SystemCallFilter = [
"@system-service"
"~@privileged"
"~@resources"
];
UMask = "0066";
};
};
};
}
|
