mirror of
https://github.com/google/go-attestation.git
synced 2024-12-22 06:17:56 +00:00
262 lines
6.4 KiB
Go
262 lines
6.4 KiB
Go
// Copyright 2019 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy of
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// the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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// +build !localtest !tpm12
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// +build cgo
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// NOTE: simulator requires cgo, hence the build tag.
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package attest
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import (
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"bytes"
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"crypto"
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"testing"
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"github.com/google/go-tpm-tools/simulator"
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)
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func setupSimulatedTPM(t *testing.T) (*simulator.Simulator, *TPM) {
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t.Helper()
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tpm, err := simulator.Get()
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if err != nil {
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t.Fatal(err)
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}
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return tpm, &TPM{tpm: &platformTPM{
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version: TPMVersion20,
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interf: TPMInterfaceKernelManaged,
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sysPath: "/dev/tpmrm0",
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rwc: tpm,
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}}
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}
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func TestSimTPM20EK(t *testing.T) {
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sim, tpm := setupSimulatedTPM(t)
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defer sim.Close()
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eks, err := tpm.EKs()
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if err != nil {
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t.Errorf("EKs() failed: %v", err)
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}
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if len(eks) == 0 || (eks[0].Public == nil) {
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t.Errorf("EKs() = %v, want at least 1 EK with populated fields", eks)
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}
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}
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func TestSimTPM20Info(t *testing.T) {
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sim, tpm := setupSimulatedTPM(t)
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defer sim.Close()
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if _, err := tpm.Info(); err != nil {
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t.Errorf("tpm.Info() failed: %v", err)
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}
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}
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func TestSimTPM20AKCreateAndLoad(t *testing.T) {
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sim, tpm := setupSimulatedTPM(t)
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defer sim.Close()
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ak, err := tpm.NewAK(nil)
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if err != nil {
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t.Fatalf("NewAK() failed: %v", err)
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}
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enc, err := ak.Marshal()
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if err != nil {
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ak.Close(tpm)
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t.Fatalf("ak.Marshal() failed: %v", err)
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}
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if err := ak.Close(tpm); err != nil {
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t.Fatalf("ak.Close() failed: %v", err)
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}
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loaded, err := tpm.LoadAK(enc)
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if err != nil {
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t.Fatalf("LoadKey() failed: %v", err)
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}
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defer loaded.Close(tpm)
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k1, k2 := ak.ak.(*key20), loaded.ak.(*key20)
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if !bytes.Equal(k1.public, k2.public) {
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t.Error("Original & loaded AK public blobs did not match.")
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t.Logf("Original = %v", k1.public)
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t.Logf("Loaded = %v", k2.public)
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}
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}
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func TestSimTPM20ActivateCredential(t *testing.T) {
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sim, tpm := setupSimulatedTPM(t)
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defer sim.Close()
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ak, err := tpm.NewAK(nil)
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if err != nil {
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t.Fatalf("NewAK() failed: %v", err)
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}
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defer ak.Close(tpm)
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EKs, err := tpm.EKs()
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if err != nil {
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t.Fatalf("EKs() failed: %v", err)
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}
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ek := chooseEK(t, EKs)
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ap := ActivationParameters{
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TPMVersion: TPMVersion20,
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AK: ak.AttestationParameters(),
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EK: ek,
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}
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secret, challenge, err := ap.Generate()
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if err != nil {
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t.Fatalf("Generate() failed: %v", err)
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}
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decryptedSecret, err := ak.ActivateCredential(tpm, *challenge)
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if err != nil {
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t.Errorf("ak.ActivateCredential() failed: %v", err)
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}
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if !bytes.Equal(secret, decryptedSecret) {
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t.Error("secret does not match decrypted secret")
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t.Logf("Secret = %v", secret)
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t.Logf("Decrypted secret = %v", decryptedSecret)
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}
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}
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func TestParseAKPublic20(t *testing.T) {
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sim, tpm := setupSimulatedTPM(t)
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defer sim.Close()
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ak, err := tpm.NewAK(nil)
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if err != nil {
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t.Fatalf("NewAK() failed: %v", err)
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}
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defer ak.Close(tpm)
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params := ak.AttestationParameters()
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if _, err := ParseAKPublic(TPMVersion20, params.Public); err != nil {
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t.Errorf("parsing AK public blob: %v", err)
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}
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}
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func TestSimTPM20QuoteAndVerify(t *testing.T) {
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sim, tpm := setupSimulatedTPM(t)
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defer sim.Close()
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ak, err := tpm.NewAK(nil)
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if err != nil {
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t.Fatalf("NewAK() failed: %v", err)
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}
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defer ak.Close(tpm)
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nonce := []byte{1, 2, 3, 4, 5, 6, 7, 8}
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quote, err := ak.Quote(tpm, nonce, HashSHA256)
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if err != nil {
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t.Fatalf("ak.Quote() failed: %v", err)
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}
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// Providing both PCR banks to AKPublic.Verify() ensures we can handle
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// the case where extra PCRs of a different digest algorithm are provided.
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var pcrs []PCR
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for _, alg := range []HashAlg{HashSHA256, HashSHA1} {
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p, err := tpm.PCRs(alg)
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if err != nil {
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t.Fatalf("tpm.PCRs(%v) failed: %v", alg, err)
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}
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pcrs = append(pcrs, p...)
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}
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pub, err := ParseAKPublic(tpm.Version(), ak.AttestationParameters().Public)
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if err != nil {
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t.Fatalf("ParseAKPublic() failed: %v", err)
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}
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if err := pub.Verify(*quote, pcrs, nonce); err != nil {
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t.Errorf("quote verification failed: %v", err)
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}
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}
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func TestSimTPM20AttestPlatform(t *testing.T) {
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sim, tpm := setupSimulatedTPM(t)
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defer sim.Close()
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ak, err := tpm.NewAK(nil)
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if err != nil {
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t.Fatalf("NewAK() failed: %v", err)
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}
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defer ak.Close(tpm)
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nonce := []byte{1, 2, 3, 4, 5, 6, 7, 8}
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attestation, err := tpm.attestPlatform(ak, nonce, nil)
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if err != nil {
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t.Fatalf("AttestPlatform() failed: %v", err)
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}
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pub, err := ParseAKPublic(attestation.TPMVersion, attestation.Public)
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if err != nil {
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t.Fatalf("ParseAKPublic() failed: %v", err)
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}
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for i, q := range attestation.Quotes {
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if err := pub.Verify(q, attestation.PCRs, nonce); err != nil {
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t.Errorf("quote[%d] verification failed: %v", i, err)
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}
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}
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}
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func TestSimTPM20PCRs(t *testing.T) {
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sim, tpm := setupSimulatedTPM(t)
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defer sim.Close()
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PCRs, err := tpm.PCRs(HashSHA256)
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if err != nil {
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t.Fatalf("PCRs() failed: %v", err)
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}
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if len(PCRs) != 24 {
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t.Errorf("len(PCRs) = %d, want %d", len(PCRs), 24)
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}
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for i, pcr := range PCRs {
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if len(pcr.Digest) != pcr.DigestAlg.Size() {
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t.Errorf("PCR %d len(digest) = %d, expected match with digest algorithm size (%d)", pcr.Index, len(pcr.Digest), pcr.DigestAlg.Size())
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}
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if pcr.Index != i {
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t.Errorf("PCR index %d does not match map index %d", pcr.Index, i)
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}
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if pcr.DigestAlg != crypto.SHA256 {
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t.Errorf("pcr.DigestAlg = %v, expected crypto.SHA256", pcr.DigestAlg)
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}
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}
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}
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func TestSimTPM20Persistence(t *testing.T) {
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sim, tpm := setupSimulatedTPM(t)
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defer sim.Close()
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ekHnd, _, err := tpm.tpm.getPrimaryKeyHandle(commonEkEquivalentHandle)
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if err != nil {
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t.Fatalf("getPrimaryKeyHandle() failed: %v", err)
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}
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if ekHnd != commonEkEquivalentHandle {
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t.Fatalf("bad EK-equivalent handle: got 0x%x, wanted 0x%x", ekHnd, commonEkEquivalentHandle)
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}
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ekHnd, p, err := tpm.tpm.getPrimaryKeyHandle(commonEkEquivalentHandle)
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if err != nil {
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t.Fatalf("second getPrimaryKeyHandle() failed: %v", err)
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}
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if ekHnd != commonEkEquivalentHandle {
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t.Fatalf("bad EK-equivalent handle: got 0x%x, wanted 0x%x", ekHnd, commonEkEquivalentHandle)
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}
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if p {
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t.Fatalf("generated a new key the second time; that shouldn't happen")
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}
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}
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