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|
package tcp
import (
"bytes"
"errors"
"flag"
"testing"
"github.com/google/go-tpm/tpm2"
)
var (
cmdAddr = flag.String("cmd_addr", "", "command port (e.g., 'localhost:2321')")
platAddr = flag.String("plat_addr", "", "platform port (e.g., 'localhost:2322')")
)
// The tests in this file are skipped unless the flags above are provided.
// To run the tests:
// Fetch the TPM reference code at https://github.com/trustedcomputinggroup/tpm
// Build the simulator per the instructions for your platform
// In one shell, run the simulator, e.g., TPMCmd/Simulator/src/tpm2-simulator
// In the other, run the tests, e.g.:
// go test --cmd_addr localhost:2321 --plat_addr localhost:2322
// Helper to open the TPM based on command-line flags passed to the test, or skip.
func getTPM(t *testing.T, powerOnStartUp bool) *TPM {
t.Helper()
flag.Parse()
if *cmdAddr == "" || *platAddr == "" {
t.Skipf("TPM simulator not provided, skipping test")
}
tpm, err := Open(Config{
CommandAddress: *cmdAddr,
PlatformAddress: *platAddr,
})
if err != nil {
t.Fatalf("Open() = %v", err)
}
if err := tpm.PowerOff(); err != nil {
t.Fatalf("PowerOff() = %v", err)
}
if powerOnStartUp {
if err := tpm.PowerOn(); err != nil {
t.Fatalf("PowerOn() = %v", err)
}
_, err := tpm2.Startup{
StartupType: tpm2.TPMSUClear,
}.Execute(tpm)
if err != nil {
t.Fatalf("Startup() = %v", err)
}
}
return tpm
}
// Helper to let us easily test that closing the TPM doesn't return any errors.
func closeTPM(t *testing.T, tpm *TPM) {
t.Helper()
if err := tpm.Close(); err != nil {
t.Fatalf("Close() = %v", err)
}
}
func TestPowerOnOff(t *testing.T) {
tpm := getTPM(t, false)
defer closeTPM(t, tpm)
// The simulator starts out powered off, but maybe the simulator was
// running before we started this test.
// Ensure it is off at the start of the test.
if err := tpm.PowerOff(); err != nil {
t.Fatalf("PowerOff() = %v", err)
}
// Check that we return the expected error for a powered-off TPM.
_, err := tpm2.Startup{
StartupType: tpm2.TPMSUClear,
}.Execute(tpm)
if !errors.Is(err, ErrEmptyResponse) {
t.Fatalf("Startup() before PowerOn() = %v, want %v", err, ErrEmptyResponse)
}
// Power on the TPM.
if err := tpm.PowerOn(); err != nil {
t.Fatalf("PowerOn() = %v", err)
}
// Check that the TPM now reports it needs to be started up.
_, err = tpm2.GetRandom{
BytesRequested: 16,
}.Execute(tpm)
if !errors.Is(err, tpm2.TPMRCInitialize) {
t.Errorf("GetRandom() = %v, want %v", err, tpm2.TPMRCInitialize)
}
_, err = tpm2.Startup{
StartupType: tpm2.TPMSUClear,
}.Execute(tpm)
if err != nil {
t.Errorf("Startup() = %v", err)
}
rnd, err := tpm2.GetRandom{
BytesRequested: 16,
}.Execute(tpm)
if err != nil {
t.Errorf("GetRandom() = %v", err)
}
if bytes.Equal(rnd.RandomBytes.Buffer, make([]byte, 16)) {
t.Errorf("GetRandom() = %x, expected random bytes", rnd.RandomBytes.Buffer)
}
}
// Helper to perform a restart ("warm reboot") or reset ("cold reboot") of the TPM.
func rebootTPM(t *testing.T, tpm *TPM, shutdownType tpm2.TPMSU) {
t.Helper()
_, err := tpm2.Shutdown{
ShutdownType: shutdownType,
}.Execute(tpm)
if err != nil {
t.Fatalf("Shutdown() = %v", err)
}
if err := tpm.Reset(); err != nil {
t.Fatalf("Reset() = %v", err)
}
_, err = tpm2.Startup{
StartupType: shutdownType,
}.Execute(tpm)
if err != nil {
t.Fatalf("Startup() = %v", err)
}
}
func TestResetRestart(t *testing.T) {
tpm := getTPM(t, true)
defer closeTPM(t, tpm)
clock1, err := tpm2.ReadClock{}.Execute(tpm)
if err != nil {
t.Fatalf("ReadClock() = %v", err)
}
// Perform a TPM Restart (SU_STATE)
rebootTPM(t, tpm, tpm2.TPMSUState)
clock2, err := tpm2.ReadClock{}.Execute(tpm)
if err != nil {
t.Fatalf("ReadClock() = %v", err)
}
// Perform a TPM Reset (SU_CLEAR)
rebootTPM(t, tpm, tpm2.TPMSUClear)
clock3, err := tpm2.ReadClock{}.Execute(tpm)
if err != nil {
t.Fatalf("ReadClock() = %v", err)
}
// Restart should increment restartCount and leave resetCount alone.
if clock2.CurrentTime.ClockInfo.RestartCount != clock1.CurrentTime.ClockInfo.RestartCount+1 {
t.Errorf("restartCount after Restart was %v, want %v",
clock2.CurrentTime.ClockInfo.RestartCount,
clock1.CurrentTime.ClockInfo.RestartCount+1)
}
if clock2.CurrentTime.ClockInfo.ResetCount != clock1.CurrentTime.ClockInfo.ResetCount {
t.Errorf("resetCount after Restart was %v, want %v",
clock2.CurrentTime.ClockInfo.ResetCount,
clock1.CurrentTime.ClockInfo.ResetCount)
}
// Reset should reset restartCount to 0 and increment resetCount.
if clock3.CurrentTime.ClockInfo.RestartCount != 0 {
t.Errorf("restartCount after Reset was %v, want 0",
clock3.CurrentTime.ClockInfo.RestartCount)
}
if clock3.CurrentTime.ClockInfo.ResetCount != clock2.CurrentTime.ClockInfo.ResetCount+1 {
t.Errorf("resetCount after Reset was %v, want %v",
clock3.CurrentTime.ClockInfo.ResetCount,
clock2.CurrentTime.ClockInfo.ResetCount+1)
}
}
|
