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|
{ config, options, pkgs, lib, ... }:
with lib;
let
cfg = config.services.aesmd;
opt = options.services.aesmd;
sgx-psw = pkgs.sgx-psw.override { inherit (cfg) debug; };
configFile = with cfg.settings; pkgs.writeText "aesmd.conf" (
concatStringsSep "\n" (
optional (whitelistUrl != null) "whitelist url = ${whitelistUrl}" ++
optional (proxy != null) "aesm proxy = ${proxy}" ++
optional (proxyType != null) "proxy type = ${proxyType}" ++
optional (defaultQuotingType != null) "default quoting type = ${defaultQuotingType}" ++
# Newline at end of file
[ "" ]
)
);
in
{
options.services.aesmd = {
enable = mkEnableOption "Intel's Architectural Enclave Service Manager (AESM) for Intel SGX";
debug = mkOption {
type = types.bool;
default = false;
description = "Whether to build the PSW package in debug mode.";
};
settings = mkOption {
description = "AESM configuration";
default = { };
type = types.submodule {
options.whitelistUrl = mkOption {
type = with types; nullOr str;
default = null;
example = "http://whitelist.trustedservices.intel.com/SGX/LCWL/Linux/sgx_white_list_cert.bin";
description = "URL to retrieve authorized Intel SGX enclave signers.";
};
options.proxy = mkOption {
type = with types; nullOr str;
default = null;
example = "http://proxy_url:1234";
description = "HTTP network proxy.";
};
options.proxyType = mkOption {
type = with types; nullOr (enum [ "default" "direct" "manual" ]);
default = if (cfg.settings.proxy != null) then "manual" else null;
defaultText = literalExpression ''
if (config.${opt.settings}.proxy != null) then "manual" else null
'';
example = "default";
description = ''
Type of proxy to use. The <literal>default</literal> uses the system's default proxy.
If <literal>direct</literal> is given, uses no proxy.
A value of <literal>manual</literal> uses the proxy from
<option>services.aesmd.settings.proxy</option>.
'';
};
options.defaultQuotingType = mkOption {
type = with types; nullOr (enum [ "ecdsa_256" "epid_linkable" "epid_unlinkable" ]);
default = null;
example = "ecdsa_256";
description = "Attestation quote type.";
};
};
};
};
config = mkIf cfg.enable {
assertions = [{
assertion = !(config.boot.specialFileSystems."/dev".options ? "noexec");
message = "SGX requires exec permission for /dev";
}];
hardware.cpu.intel.sgx.provision.enable = true;
# Make sure the AESM service can find the SGX devices until
# https://github.com/intel/linux-sgx/issues/772 is resolved
# and updated in nixpkgs.
hardware.cpu.intel.sgx.enableDcapCompat = mkForce true;
systemd.services.aesmd =
let
storeAesmFolder = "${sgx-psw}/aesm";
# Hardcoded path AESM_DATA_FOLDER in psw/ae/aesm_service/source/oal/linux/aesm_util.cpp
aesmDataFolder = "/var/opt/aesmd/data";
aesmStateDirSystemd = "%S/aesmd";
in
{
description = "Intel Architectural Enclave Service Manager";
wantedBy = [ "multi-user.target" ];
after = [
"auditd.service"
"network.target"
"syslog.target"
];
environment = {
NAME = "aesm_service";
AESM_PATH = storeAesmFolder;
LD_LIBRARY_PATH = storeAesmFolder;
};
# Make sure any of the SGX application enclave devices is available
unitConfig.AssertPathExists = [
# legacy out-of-tree driver
"|/dev/isgx"
# DCAP driver
"|/dev/sgx/enclave"
# in-tree driver
"|/dev/sgx_enclave"
];
serviceConfig = rec {
ExecStartPre = pkgs.writeShellScript "copy-aesmd-data-files.sh" ''
set -euo pipefail
whiteListFile="${aesmDataFolder}/white_list_cert_to_be_verify.bin"
if [[ ! -f "$whiteListFile" ]]; then
${pkgs.coreutils}/bin/install -m 644 -D \
"${storeAesmFolder}/data/white_list_cert_to_be_verify.bin" \
"$whiteListFile"
fi
'';
ExecStart = "${sgx-psw}/bin/aesm_service --no-daemon";
ExecReload = ''${pkgs.coreutils}/bin/kill -SIGHUP "$MAINPID"'';
Restart = "on-failure";
RestartSec = "15s";
DynamicUser = true;
Group = "sgx";
SupplementaryGroups = [
config.hardware.cpu.intel.sgx.provision.group
];
Type = "simple";
WorkingDirectory = storeAesmFolder;
StateDirectory = "aesmd";
StateDirectoryMode = "0700";
RuntimeDirectory = "aesmd";
RuntimeDirectoryMode = "0750";
# Hardening
# chroot into the runtime directory
RootDirectory = "%t/aesmd";
BindReadOnlyPaths = [
builtins.storeDir
# Hardcoded path AESM_CONFIG_FILE in psw/ae/aesm_service/source/utils/aesm_config.cpp
"${configFile}:/etc/aesmd.conf"
];
BindPaths = [
# Hardcoded path CONFIG_SOCKET_PATH in psw/ae/aesm_service/source/core/ipc/SocketConfig.h
"%t/aesmd:/var/run/aesmd"
"%S/aesmd:/var/opt/aesmd"
];
# PrivateDevices=true will mount /dev noexec which breaks AESM
PrivateDevices = false;
DevicePolicy = "closed";
DeviceAllow = [
# legacy out-of-tree driver
"/dev/isgx rw"
# DCAP driver
"/dev/sgx rw"
# in-tree driver
"/dev/sgx_enclave rw"
"/dev/sgx_provision rw"
];
# Requires Internet access for attestation
PrivateNetwork = false;
RestrictAddressFamilies = [
# Allocates the socket /var/run/aesmd/aesm.socket
"AF_UNIX"
# Uses the HTTP protocol to initialize some services
"AF_INET"
"AF_INET6"
];
# True breaks stuff
MemoryDenyWriteExecute = false;
# needs the ipc syscall in order to run
SystemCallFilter = [
"@system-service"
"~@aio"
"~@chown"
"~@clock"
"~@cpu-emulation"
"~@debug"
"~@keyring"
"~@memlock"
"~@module"
"~@mount"
"~@privileged"
"~@raw-io"
"~@reboot"
"~@resources"
"~@setuid"
"~@swap"
"~@sync"
"~@timer"
];
SystemCallArchitectures = "native";
SystemCallErrorNumber = "EPERM";
CapabilityBoundingSet = "";
KeyringMode = "private";
LockPersonality = true;
NoNewPrivileges = true;
NotifyAccess = "none";
PrivateMounts = true;
PrivateTmp = true;
PrivateUsers = true;
ProcSubset = "pid";
ProtectClock = true;
ProtectControlGroups = true;
ProtectHome = true;
ProtectHostname = true;
ProtectKernelLogs = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
ProtectProc = "invisible";
ProtectSystem = "strict";
RemoveIPC = true;
RestrictNamespaces = true;
RestrictRealtime = true;
RestrictSUIDSGID = true;
UMask = "0066";
};
};
};
}
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