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|
package tpm2test
import (
"bytes"
"crypto/sha1"
"crypto/sha256"
"crypto/sha512"
"fmt"
"testing"
. "github.com/google/go-tpm/tpm2"
"github.com/google/go-tpm/tpm2/transport/simulator"
)
func TestPCRs(t *testing.T) {
for i, tc := range []struct {
pcrs []uint
wantSelect []byte
}{
{
pcrs: nil,
wantSelect: []byte{0x00, 0x00, 0x00},
},
{
pcrs: []uint{0},
wantSelect: []byte{0x01, 0x00, 0x00},
},
{
pcrs: []uint{0, 1, 2},
wantSelect: []byte{0x07, 0x00, 0x00},
},
{
pcrs: []uint{0, 7},
wantSelect: []byte{0x81, 0x00, 0x00},
},
{
pcrs: []uint{8},
wantSelect: []byte{0x00, 0x01, 0x00},
},
{
pcrs: []uint{1, 8, 9},
wantSelect: []byte{0x02, 0x03, 0x00},
},
{
pcrs: []uint{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23},
wantSelect: []byte{0xff, 0xff, 0xff},
},
{
pcrs: []uint{255},
wantSelect: []byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80},
},
} {
t.Run(fmt.Sprintf("%v", i), func(t *testing.T) {
selection := PCClientCompatible.PCRs(tc.pcrs...)
if !bytes.Equal(selection, tc.wantSelect) {
t.Errorf("PCRs() = 0x%x, want 0x%x", selection, tc.wantSelect)
}
})
}
}
var extendstpm2 = map[TPMAlgID][]struct {
digest []byte
}{
TPMAlgSHA1: {
{bytes.Repeat([]byte{0x00}, sha1.Size)},
{bytes.Repeat([]byte{0x01}, sha1.Size)},
{bytes.Repeat([]byte{0x02}, sha1.Size)}},
TPMAlgSHA256: {
{bytes.Repeat([]byte{0x00}, sha256.Size)},
{bytes.Repeat([]byte{0x01}, sha256.Size)},
{bytes.Repeat([]byte{0x02}, sha256.Size)}},
TPMAlgSHA384: {
{bytes.Repeat([]byte{0x00}, sha512.Size384)},
{bytes.Repeat([]byte{0x01}, sha512.Size384)},
{bytes.Repeat([]byte{0x02}, sha512.Size384)}},
}
func allZero(s []byte) bool {
for _, v := range s {
if v != 0 {
return false
}
}
return true
}
func TestPCRReset(t *testing.T) {
thetpm, err := simulator.OpenSimulator()
if err != nil {
t.Fatalf("could not connect to TPM simulator: %v", err)
}
defer thetpm.Close()
DebugPCR := uint(16)
cases := []struct {
name string
hashalg TPMAlgID
}{
{"SHA1", TPMAlgSHA1},
{"SHA256", TPMAlgSHA256},
{"SHA384", TPMAlgSHA384},
}
for _, c := range cases {
t.Run(c.name, func(t *testing.T) {
authHandle := AuthHandle{
Handle: TPMHandle(DebugPCR),
Auth: PasswordAuth(nil),
}
pcrRead := PCRRead{
PCRSelectionIn: TPMLPCRSelection{
PCRSelections: []TPMSPCRSelection{
{
Hash: c.hashalg,
PCRSelect: PCClientCompatible.PCRs(DebugPCR),
},
},
},
}
// Extending PCR 16
for _, d := range extendstpm2[c.hashalg] {
pcrExtend := PCRExtend{
PCRHandle: authHandle,
Digests: TPMLDigestValues{
Digests: []TPMTHA{
{
HashAlg: c.hashalg,
Digest: d.digest,
},
},
},
}
if _, err := pcrExtend.Execute(thetpm); err != nil {
t.Fatalf("failed to extend pcr for test %v", err)
}
}
pcrReadRsp, err := pcrRead.Execute(thetpm)
if err != nil {
t.Fatalf("failed to read PCRs")
}
postExtendPCR16 := pcrReadRsp.PCRValues.Digests[0].Buffer
if allZero(postExtendPCR16) {
t.Errorf("postExtendPCR16 not expected to be all Zero: %v", postExtendPCR16)
}
// Resetting PCR 16
pcrReset := PCRReset{
PCRHandle: authHandle,
}
if _, err := pcrReset.Execute(thetpm); err != nil {
t.Fatalf("pcrReset failed: %v", err)
}
if pcrReadRsp, err = pcrRead.Execute(thetpm); err != nil {
t.Fatalf("failed to read PCRs")
}
postResetPCR16 := pcrReadRsp.PCRValues.Digests[0].Buffer
if !allZero(postResetPCR16) {
t.Errorf("postResetPCR16 expected to be all Zero: %v", postExtendPCR16)
}
})
}
}
func TestPCREvent(t *testing.T) {
thetpm, err := simulator.OpenSimulator()
if err != nil {
t.Fatalf("could not connect to TPM simulator: %v", err)
}
defer thetpm.Close()
cases := []struct {
name string
hashalg TPMAlgID
}{
{"SHA1", TPMAlgSHA1},
{"SHA256", TPMAlgSHA256},
{"SHA384", TPMAlgSHA384},
}
// Extend every SRTM PCR with TPM2_PCR_Event
for _, c := range cases {
t.Run(c.name, func(t *testing.T) {
for i := 0; i < 17; i++ {
t.Run(fmt.Sprintf("PCR%02d", i), func(t *testing.T) {
pcrRead := PCRRead{
PCRSelectionIn: TPMLPCRSelection{
PCRSelections: []TPMSPCRSelection{
{
Hash: c.hashalg,
PCRSelect: PCClientCompatible.PCRs(20),
},
},
},
}
pcrEvent := PCREvent{
PCRHandle: TPMHandle(i),
EventData: TPM2BEvent{Buffer: []byte("hello")},
}
if _, err := pcrEvent.Execute(thetpm); err != nil {
t.Fatalf("failed to extend pcr for test %v", err)
}
pcrReadRsp, err := pcrRead.Execute(thetpm)
if err != nil {
t.Fatalf("failed to read PCRs")
}
postExtendPCR16 := pcrReadRsp.PCRValues.Digests[0].Buffer
if allZero(postExtendPCR16) {
t.Errorf("postExtendPCR16 not expected to be all Zero: %v", postExtendPCR16)
}
})
}
})
}
}
|
