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attestation_unittest.cc
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attestation_unittest.cc
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// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cryptohome/attestation.h"
#include <string>
#include <vector>
#include <base/files/file_path.h>
#include <base/strings/string_number_conversions.h>
#include <base/strings/string_util.h>
#include <brillo/data_encoding.h>
#include <brillo/http/http_transport_fake.h>
#include <brillo/mime_utils.h>
#include <brillo/secure_blob.h>
#include <crypto/scoped_openssl_types.h>
#include <gmock/gmock.h>
#include <google/protobuf/util/message_differencer.h>
#include <gtest/gtest.h>
#include <openssl/rsa.h>
#include <openssl/x509.h>
#include "cryptohome/crypto.h"
#include "cryptohome/cryptolib.h"
#include "cryptohome/mock_install_attributes.h"
#include "cryptohome/mock_keystore.h"
#include "cryptohome/mock_platform.h"
#include "cryptohome/mock_tpm.h"
#include "cryptohome/mock_tpm_init.h"
#include "attestation.pb.h" // NOLINT(build/include)
using base::FilePath;
using brillo::Blob;
using brillo::SecureBlob;
using google::protobuf::util::MessageDifferencer;
using ::testing::_;
using ::testing::DoAll;
using ::testing::Invoke;
using ::testing::NiceMock;
using ::testing::Return;
using ::testing::SetArgPointee;
using ::testing::StartsWith;
using ::testing::WithArgs;
namespace cryptohome {
static const char* kTestPath = "/tmp/attestation_test.epb";
static const char* kTestUser = "test_user";
static const char kABEData[] =
"2eac34fa74994262b907c15a3a1462e349e5108ca0d0e807f4b1a3ee741a5594";
static const char kDEN[] =
"865cc962ffe14b3638b2d1f860e77b531644a3aba67e52e49e1f6c0a31d81daf";
static const char kEID[] =
"809c6c9f425c59b86e551f4e8fdccd5a2200b08fe3250c4971f40d8bbcf7820a";
class AttestationBaseTest : public testing::Test {
public:
AttestationBaseTest() : crypto_(&platform_), attestation_() {
crypto_.set_tpm(&tpm_);
crypto_.set_use_tpm(true);
}
virtual ~AttestationBaseTest() {}
void SetUpAttestation(Attestation* attestation) {
attestation->set_database_path(kTestPath);
attestation->set_key_store(&key_store_);
}
void SetUp() override {
SetUpAttestation(&attestation_);
http_transport_ = std::make_shared<brillo::http::fake::Transport>();
attestation_.set_http_transport(http_transport_);
// Fake up a single file by default.
ON_CALL(platform_,
WriteStringToFileAtomicDurable(
Property(&FilePath::value, StartsWith(kTestPath)), _, _))
.WillByDefault(
WithArgs<1>(Invoke(this, &AttestationBaseTest::WriteDB)));
ON_CALL(
platform_,
ReadFileToString(Property(&FilePath::value, StartsWith(kTestPath)), _))
.WillByDefault(WithArgs<1>(Invoke(this, &AttestationBaseTest::ReadDB)));
// Configure a TPM that is ready.
ON_CALL(tpm_, IsEnabled()).WillByDefault(Return(true));
ON_CALL(tpm_, IsOwned()).WillByDefault(Return(true));
ON_CALL(tpm_, IsBeingOwned()).WillByDefault(Return(false));
Initialize();
}
virtual void Initialize() {
attestation_.Initialize(&tpm_, &tpm_init_, &platform_, &crypto_,
&install_attributes_,
brillo::SecureBlob() /* abe_data */,
false /* retain_endorsement_data */);
}
virtual bool WriteDB(const std::string& db) {
serialized_db_.assign(db);
return true;
}
virtual bool ReadDB(std::string* db) {
if (serialized_db_.empty()) {
return false;
}
db->assign(serialized_db_);
return true;
}
virtual bool ComputeEnterpriseEnrollmentId(brillo::SecureBlob* blob) {
return attestation_.ComputeEnterpriseEnrollmentId(blob);
}
virtual std::string GetValidEndorsementKey() {
const std::string hex_ek =
"3082010A0282010100D3EE9D14FAC4C42B35FEDC87363CC29807A3F39D3E45D2"
"49586F620C6425CE981E8619DCE50D964E934A1F1FD2C1066418DD75D8916D85"
"DD9E82C27C82A8C2C9BC76BA914B5A43F7535AEAA2F7BD985F46A46C92334643"
"C89F5598ABD191AA5439088778774DB3B07FD08F019997893BEC1A87571AC95F"
"66ADE2F3631A2C9CF8EF0B94D2CA62E81F1FF9CC71339838E229E63CA59E0BB6"
"4D2134C3AF705BCF0F614E58DF848897454FFA2FA42073F80174C1D3D0C54D5B"
"DC45747FE662D6D321AEA5375F0AE489DF6ABB018D5D11707E546E8487641290"
"F9F9B3CC3A1F8631FB0F3486A875F6005D3539A5823F7618B007779FB31CFB7F"
"E36A1C2D9DEFD8F5030203010001";
std::vector<uint8_t> ek_bytes;
base::HexStringToBytes(hex_ek, &ek_bytes);
return std::string(ek_bytes.begin(), ek_bytes.end());
}
protected:
std::string serialized_db_;
// TODO(crbug.com/891630): Use a StrictMock<MockTpm> and fix tests.
NiceMock<MockTpm> tpm_;
NiceMock<MockTpmInit> tpm_init_;
NiceMock<MockPlatform> platform_;
Crypto crypto_;
NiceMock<MockKeyStore> key_store_;
NiceMock<MockInstallAttributes> install_attributes_;
std::shared_ptr<brillo::http::fake::Transport> http_transport_;
Attestation attestation_;
crypto::ScopedRSA rsa_; // Access with rsa().
bool is_enterprise_setup_ = false;
RSA* rsa() {
if (!rsa_) {
crypto::ScopedBIGNUM e(BN_new());
CHECK(e);
EXPECT_TRUE(BN_set_word(e.get(), 65537));
rsa_.reset(RSA_new());
CHECK(rsa_);
EXPECT_TRUE(RSA_generate_key_ex(rsa_.get(), 2048, e.get(), nullptr));
}
return rsa_.get();
}
virtual void SetUpEnterprise() {
if (!is_enterprise_setup_) {
crypto::ScopedBIGNUM e(BN_new());
CHECK(e);
EXPECT_TRUE(BN_set_word(e.get(), 65537));
crypto::ScopedRSA rsa_def_sign(RSA_new());
crypto::ScopedRSA rsa_def_enc(RSA_new());
crypto::ScopedRSA rsa_test_sign(RSA_new());
crypto::ScopedRSA rsa_test_enc(RSA_new());
CHECK(rsa_def_sign);
CHECK(rsa_def_enc);
CHECK(rsa_test_sign);
CHECK(rsa_test_enc);
EXPECT_TRUE(
RSA_generate_key_ex(rsa_def_sign.get(), 2048, e.get(), nullptr));
EXPECT_TRUE(
RSA_generate_key_ex(rsa_def_enc.get(), 2048, e.get(), nullptr));
EXPECT_TRUE(
RSA_generate_key_ex(rsa_test_sign.get(), 2048, e.get(), nullptr));
EXPECT_TRUE(
RSA_generate_key_ex(rsa_test_enc.get(), 2048, e.get(), nullptr));
attestation_.set_enterprise_test_keys(Attestation::kDefaultVA,
rsa_def_sign.release(), rsa_def_enc.release());
attestation_.set_enterprise_test_keys(Attestation::kTestVA,
rsa_test_sign.release(), rsa_test_enc.release());
is_enterprise_setup_ = true;
}
}
RSA* enterprise_signing_rsa(Attestation::VAType va_type) {
SetUpEnterprise();
return attestation_.GetEnterpriseSigningKey(va_type);
}
RSA* enterprise_encryption_rsa(Attestation::VAType va_type) {
SetUpEnterprise();
return attestation_.GetEnterpriseEncryptionKey(va_type);
}
SecureBlob GetEnrollBlob() {
AttestationEnrollmentResponse pb;
pb.set_status(OK);
pb.set_detail("");
pb.mutable_encrypted_identity_credential()->set_asym_ca_contents("1234");
pb.mutable_encrypted_identity_credential()->set_sym_ca_attestation("5678");
std::string tmp;
pb.SerializeToString(&tmp);
return SecureBlob(tmp.begin(), tmp.end());
}
SecureBlob GetCertRequestBlob(const SecureBlob& request) {
AttestationCertificateRequest request_pb;
CHECK(request_pb.ParseFromArray(request.data(), request.size()));
AttestationCertificateResponse pb;
pb.set_message_id(request_pb.message_id());
pb.set_status(OK);
pb.set_detail("");
pb.set_certified_key_credential("response_cert");
pb.set_intermediate_ca_cert("response_ca_cert");
std::string tmp;
pb.SerializeToString(&tmp);
return SecureBlob(tmp.begin(), tmp.end());
}
SecureBlob GetCertifiedKeyBlob(const std::string& payload,
bool include_ca_cert) {
CertifiedKey pb;
pb.set_certified_key_credential("stored_cert");
if (include_ca_cert)
pb.set_intermediate_ca_cert("stored_ca_cert");
pb.set_public_key(GetPKCS1PublicKey().to_string());
pb.set_payload(payload);
std::string tmp;
pb.SerializeToString(&tmp);
return SecureBlob(tmp.begin(), tmp.end());
}
bool CompareBlob(const SecureBlob& blob, const std::string& str) {
return (blob.to_string() == str);
}
std::string EncodeCertChain(const std::string& cert1,
const std::string& cert2) {
std::string chain = "-----BEGIN CERTIFICATE-----\n";
chain += brillo::data_encoding::Base64EncodeWrapLines(cert1);
chain += "-----END CERTIFICATE-----";
if (!cert2.empty()) {
chain += "\n-----BEGIN CERTIFICATE-----\n";
chain += brillo::data_encoding::Base64EncodeWrapLines(cert2);
chain += "-----END CERTIFICATE-----";
}
return chain;
}
SecureBlob GetPKCS1PublicKey() {
unsigned char* buffer = nullptr;
int length = i2d_RSAPublicKey(rsa(), &buffer);
if (length <= 0)
return SecureBlob();
SecureBlob tmp(buffer, buffer + length);
OPENSSL_free(buffer);
return tmp;
}
SecureBlob GetX509PublicKey() {
unsigned char* buffer = nullptr;
int length = i2d_RSA_PUBKEY(rsa(), &buffer);
if (length <= 0)
return SecureBlob();
SecureBlob tmp(buffer, buffer + length);
OPENSSL_free(buffer);
return tmp;
}
bool VerifySimpleChallenge(const SecureBlob& response,
const std::string& challenge,
const std::string& signature) {
SignedData signed_data;
if (!signed_data.ParseFromArray(response.data(), response.size()))
return false;
if (signed_data.data().find(challenge) != 0 ||
signed_data.data() == challenge)
return false;
if (signed_data.signature() != signature)
return false;
return true;
}
bool VerifyEnterpriseVaChallenge(Attestation::VAType va_type,
const SecureBlob& response,
KeyType key_type,
const std::string& domain,
const std::string& device_id,
const std::string& cert_chain,
const std::string& signature) {
SignedData signed_data;
if (!signed_data.ParseFromArray(response.data(), response.size()))
return false;
ChallengeResponse response_pb;
if (!response_pb.ParseFromString(signed_data.data()))
return false;
std::string expected_challenge = GetEnterpriseVaChallenge(
va_type, "EnterpriseKeyChallenge", false).to_string();
if (response_pb.challenge().data() != expected_challenge)
return false;
std::string key_info;
if (!DecryptEnterpriseData(va_type, response_pb.encrypted_key_info(),
&key_info))
return false;
KeyInfo key_info_pb;
if (!key_info_pb.ParseFromString(key_info))
return false;
if (key_info_pb.domain() != domain ||
key_info_pb.device_id() != device_id ||
key_info_pb.key_type() != key_type ||
key_info_pb.certificate() != cert_chain)
return false;
if (signed_data.signature() != signature)
return false;
return true;
}
SecureBlob GetEnterpriseVaChallenge(Attestation::VAType va_type,
const std::string& prefix,
bool sign) {
Challenge challenge;
challenge.set_prefix(prefix);
challenge.set_nonce("nonce");
challenge.set_timestamp(123456789);
std::string serialized;
challenge.SerializeToString(&serialized);
if (sign) {
unsigned char buffer[256];
unsigned int length = 0;
SecureBlob digest = CryptoLib::Sha256(SecureBlob(serialized));
RSA_sign(NID_sha256,
digest.data(), digest.size(),
buffer, &length,
enterprise_signing_rsa(va_type));
SignedData signed_challenge;
signed_challenge.set_data(serialized);
signed_challenge.set_signature(buffer, length);
signed_challenge.SerializeToString(&serialized);
}
return SecureBlob(serialized);
}
bool DecryptEnterpriseData(Attestation::VAType va_type,
const EncryptedData& input,
std::string* output) {
// Unwrap the AES key.
unsigned char* wrapped_key_buffer = reinterpret_cast<unsigned char*>(
const_cast<char*>(input.wrapped_key().data()));
unsigned char buffer[256];
int length = RSA_private_decrypt(input.wrapped_key().size(),
wrapped_key_buffer,
buffer,
enterprise_encryption_rsa(va_type),
RSA_PKCS1_OAEP_PADDING);
if (length != 32)
return false;
SecureBlob aes_key(buffer, buffer + length);
// Decrypt the blob.
SecureBlob decrypted;
brillo::SecureBlob encrypted(input.encrypted_data().begin(),
input.encrypted_data().end());
SecureBlob aes_iv = SecureBlob(input.iv());
if (!CryptoLib::AesDecryptSpecifyBlockMode(encrypted, 0, encrypted.size(),
aes_key, aes_iv,
CryptoLib::kPaddingStandard,
CryptoLib::kCbc,
&decrypted))
return false;
*output = decrypted.to_string();
return true;
}
// Returns a copy of the database as it exists on 'disk'.
AttestationDatabase GetPersistentDatabase() {
AttestationDatabase db;
attestation_.DecryptDatabase(serialized_db_, &db);
return db;
}
// Returns a mutable reference to the current database instance. If a test is
// verifying database changes it should use GetPersistentDatabase() so it will
// also verify that the changes are written to disk correctly.
AttestationDatabase& GetMutableDatabase() {
return attestation_.database_pb_;
}
// Verify Privacy CA-related data, including the default CA's identity
// credential.
void VerifyPCAData(const AttestationDatabase& db,
const char* default_identity_credential) {
ASSERT_EQ(default_identity_credential ? 1 : 0,
db.identity_certificates().size());
for (int pca = 0; pca < db.identity_certificates().size(); ++pca) {
const AttestationDatabase::IdentityCertificate identity_certificate =
db.identity_certificates().at(pca);
ASSERT_EQ(0, identity_certificate.identity());
ASSERT_EQ(pca, identity_certificate.aca());
if (default_identity_credential && pca == Attestation::kDefaultPCA) {
ASSERT_EQ(default_identity_credential,
identity_certificate.identity_credential());
} else {
ASSERT_FALSE(identity_certificate.has_identity_credential());
}
}
// All PCAs have encrypted credentials.
for (int pca = Attestation::kDefaultPCA; pca < Attestation::kMaxPCAType;
++pca) {
ASSERT_TRUE(
db.credentials().encrypted_endorsement_credentials().count(pca));
}
}
// Verify Privacy CA-related data, including the lack of default CA's identity
// credential.
void VerifyPCAData(const AttestationDatabase& db) {
VerifyPCAData(db, nullptr);
}
// Gets the Google Privacy CA web-origin -- this can change depending on
// whether the test server is being targeted.
std::string GetPCAWebOrigin(Attestation::PCAType pca_type) const {
switch (pca_type) {
default:
case Attestation::kDefaultPCA:
return attestation_.kDefaultPCAWebOrigin;
case Attestation::kTestPCA:
return attestation_.kTestPCAWebOrigin;
}
}
size_t GetDigestSize() const { return Attestation::kDigestSize; }
};
TEST_F(AttestationBaseTest, NotPreparedForEnrollment) {
ASSERT_FALSE(attestation_.IsPreparedForEnrollment());
}
TEST_F(AttestationBaseTest, PrepareForEnrollment) {
attestation_.PrepareForEnrollment();
EXPECT_TRUE(attestation_.IsPreparedForEnrollment());
AttestationDatabase db = GetPersistentDatabase();
// One identity has been created.
EXPECT_EQ(1, db.identities().size());
const AttestationDatabase::Identity& identity_data = db.identities().Get(0);
EXPECT_TRUE(identity_data.has_identity_binding());
EXPECT_TRUE(identity_data.has_identity_key());
EXPECT_EQ(1, identity_data.pcr_quotes().count(0));
EXPECT_EQ(1, identity_data.pcr_quotes().count(1));
EXPECT_EQ(IDENTITY_FEATURE_ENTERPRISE_ENROLLMENT_ID,
identity_data.features());
// Deprecated identity-related values have not been set.
EXPECT_FALSE(db.has_identity_binding());
EXPECT_FALSE(db.has_identity_key());
EXPECT_FALSE(db.has_pcr0_quote());
EXPECT_FALSE(db.has_pcr1_quote());
// We have a delegate to activate the AIK.
EXPECT_TRUE(db.has_delegate());
// Verify Privacy CA-related data.
VerifyPCAData(db);
// These deprecated fields have not been set either.
EXPECT_TRUE(db.has_credentials());
EXPECT_FALSE(db.credentials().has_default_encrypted_endorsement_credential());
}
TEST_F(AttestationBaseTest, PrepareForEnrollmentNoIdentityFeatures) {
attestation_.set_default_identity_features_for_test(NO_IDENTITY_FEATURES);
attestation_.PrepareForEnrollment();
EXPECT_TRUE(attestation_.IsPreparedForEnrollment());
AttestationDatabase db = GetPersistentDatabase();
// One identity has been created.
EXPECT_EQ(1, db.identities().size());
const AttestationDatabase::Identity& identity_data =
db.identities().Get(0);
EXPECT_TRUE(identity_data.has_identity_binding());
EXPECT_TRUE(identity_data.has_identity_key());
EXPECT_EQ(1, identity_data.pcr_quotes().count(0));
EXPECT_EQ(1, identity_data.pcr_quotes().count(1));
EXPECT_EQ(NO_IDENTITY_FEATURES, identity_data.features());
// Deprecated identity-related values have not been set.
EXPECT_FALSE(db.has_identity_binding());
EXPECT_FALSE(db.has_identity_key());
EXPECT_FALSE(db.has_pcr0_quote());
EXPECT_FALSE(db.has_pcr1_quote());
// We have a delegate to activate the AIK.
EXPECT_TRUE(db.has_delegate());
// Verify Privacy CA-related data.
VerifyPCAData(db);
// These deprecated fields have not been set either.
EXPECT_TRUE(db.has_credentials());
EXPECT_FALSE(db.credentials().has_default_encrypted_endorsement_credential());
}
TEST_F(AttestationBaseTest, IdentityCertificateMapIsDeepCopied) {
SecureBlob blob;
EXPECT_FALSE(
attestation_.CreateEnrollRequest(Attestation::kDefaultPCA, &blob));
attestation_.PrepareForEnrollment();
EXPECT_FALSE(attestation_.HasIdentityCertificate(Attestation::kFirstIdentity,
Attestation::kDefaultPCA));
EXPECT_TRUE(
attestation_.CreateEnrollRequest(Attestation::kDefaultPCA, &blob));
EXPECT_TRUE(attestation_.Enroll(Attestation::kDefaultPCA, GetEnrollBlob()));
EXPECT_TRUE(attestation_.HasIdentityCertificate(Attestation::kFirstIdentity,
Attestation::kDefaultPCA));
// Check that the identity certificate map is not the same as what the
// database contains.
Attestation::IdentityCertificateMap map =
attestation_.GetIdentityCertificateMap();
AttestationDatabase db = GetPersistentDatabase();
db.mutable_identity_certificates()->at(Attestation::kDefaultPCA).set_aca(
Attestation::kMaxPCAType);
EXPECT_EQ(Attestation::kDefaultPCA, map.at(Attestation::kDefaultPCA).aca());
}
// Tests DeleteKeysByPrefix with device-wide keys stored in the attestation db.
TEST_F(AttestationBaseTest, DeleteByPrefixDevice) {
// Test with an empty db.
ASSERT_TRUE(attestation_.DeleteKeysByPrefix(false, "", "prefix"));
// Test with a single matching key.
AttestationDatabase& db = GetMutableDatabase();
db.add_device_keys()->set_key_name("prefix1");
ASSERT_TRUE(attestation_.DeleteKeysByPrefix(false, "", "prefix"));
EXPECT_EQ(0, db.device_keys_size());
// Test with a single non-matching key.
db.add_device_keys()->set_key_name("other");
ASSERT_TRUE(attestation_.DeleteKeysByPrefix(false, "", "prefix"));
EXPECT_EQ(1, db.device_keys_size());
// Test with an empty prefix.
ASSERT_TRUE(attestation_.DeleteKeysByPrefix(false, "", ""));
EXPECT_EQ(0, db.device_keys_size());
// Test with multiple matching / non-matching keys.
db.add_device_keys()->set_key_name("prefix1");
db.add_device_keys()->set_key_name("other1");
db.add_device_keys()->set_key_name("prefix2");
db.add_device_keys()->set_key_name("other2");
db.add_device_keys()->set_key_name("prefix3");
db.add_device_keys()->set_key_name("other3");
db.add_device_keys()->set_key_name("prefix4");
ASSERT_TRUE(attestation_.DeleteKeysByPrefix(false, "", "prefix"));
EXPECT_EQ(3, db.device_keys_size());
for (int i = 0; i < db.device_keys_size(); ++i) {
EXPECT_EQ(0, db.device_keys(i).key_name().find("other"));
}
}
// Tests DeleteKeysByPrefix with user-owned keys. This object does not manage
// user-owned keys so the test is trivial.
TEST_F(AttestationBaseTest, DeleteByPrefixUser) {
EXPECT_TRUE(attestation_.DeleteKeysByPrefix(true, kTestUser, "prefix"));
}
TEST_F(AttestationBaseTest, GetEKInfo) {
std::string info;
EXPECT_TRUE(attestation_.GetEKInfo(&info));
EXPECT_TRUE(base::IsStringASCII(info));
// Simulate owner password not available.
EXPECT_CALL(tpm_, GetEndorsementCredential(_))
.WillRepeatedly(Return(false));
info.clear();
EXPECT_FALSE(attestation_.GetEKInfo(&info));
EXPECT_EQ(0, info.size());
}
TEST_F(AttestationBaseTest, FinalizeEndorsementData) {
// Simulate first login.
attestation_.PrepareForEnrollment();
// Expect endorsement data to be available.
AttestationDatabase db = GetPersistentDatabase();
EXPECT_TRUE(db.has_credentials() &&
db.credentials().has_endorsement_public_key() &&
db.credentials().has_endorsement_credential());
// Simulate second login.
attestation_.Initialize(&tpm_, &tpm_init_, &platform_, &crypto_,
&install_attributes_, brillo::SecureBlob() /* abe_data */,
false /* retain_endorsement_data */);
// Expect endorsement data to be no longer available.
db = GetPersistentDatabase();
EXPECT_TRUE(db.has_credentials() &&
!db.credentials().has_endorsement_public_key() &&
!db.credentials().has_endorsement_credential());
}
TEST_F(AttestationBaseTest, RetainEndorsementData) {
// Simulate first login.
attestation_.PrepareForEnrollment();
// Expect endorsement data to be available.
AttestationDatabase db = GetPersistentDatabase();
EXPECT_TRUE(db.has_credentials() &&
db.credentials().has_endorsement_public_key() &&
db.credentials().has_endorsement_credential());
// Simulate second login.
attestation_.Initialize(&tpm_, &tpm_init_, &platform_, &crypto_,
&install_attributes_, brillo::SecureBlob() /* abe_data */,
true /* retain_endorsement_data */);
// Expect endorsement data to be still available.
db = GetPersistentDatabase();
EXPECT_TRUE(db.has_credentials() &&
db.credentials().has_endorsement_public_key() &&
db.credentials().has_endorsement_credential());
attestation_.FinalizeEndorsementData();
// Expect endorsement data to be still available.
db = GetPersistentDatabase();
EXPECT_TRUE(db.has_credentials() &&
db.credentials().has_endorsement_public_key() &&
db.credentials().has_endorsement_credential());
}
TEST_F(AttestationBaseTest, MigrateAttestationDatabase) {
// Simulate first login.
attestation_.PrepareForEnrollment();
// Simulate an older database.
AttestationDatabase db = GetPersistentDatabase();
db.mutable_credentials()->clear_encrypted_endorsement_credentials();
db.mutable_credentials()->set_endorsement_credential("endorsement_cred");
EncryptedData default_encrypted_endorsement_credential;
default_encrypted_endorsement_credential.set_wrapped_key("default_key");
db.mutable_credentials()
->mutable_default_encrypted_endorsement_credential()
->CopyFrom(default_encrypted_endorsement_credential);
db.clear_identities();
db.clear_identity_certificates();
db.mutable_identity_binding()->set_identity_binding("identity_binding");
db.mutable_identity_binding()->set_identity_public_key("identity_public_key");
db.mutable_identity_key()->set_identity_credential("identity_cred");
db.mutable_pcr0_quote()->set_quote("pcr0_quote");
db.mutable_pcr1_quote()->set_quote("pcr1_quote");
// Persist that older database.
attestation_.PersistDatabase(db);
// Simulate second login.
Initialize();
attestation_.PrepareForEnrollment();
db = GetPersistentDatabase();
// The default encrypted endorsement credential has been migrated.
// The deprecated field has not been cleared so that older code can still
// use the database.
ASSERT_TRUE(MessageDifferencer::Equals(
default_encrypted_endorsement_credential,
db.credentials().encrypted_endorsement_credentials().at(
Attestation::kDefaultPCA)));
ASSERT_TRUE(MessageDifferencer::Equals(
default_encrypted_endorsement_credential,
db.credentials().default_encrypted_endorsement_credential()));
// The default identity has data copied from the deprecated database fields.
// The deprecated fields have not been cleared so that older code can still
// use the database.
const AttestationDatabase::Identity& default_identity_data =
db.identities().Get(Attestation::kDefaultPCA);
EXPECT_EQ(IDENTITY_FEATURE_ENTERPRISE_ENROLLMENT_ID,
default_identity_data.features());
ASSERT_EQ("identity_binding",
default_identity_data.identity_binding().identity_binding());
ASSERT_EQ("identity_public_key",
default_identity_data.identity_binding().identity_public_key());
ASSERT_EQ("identity_binding", db.identity_binding().identity_binding());
ASSERT_EQ("identity_public_key", db.identity_binding().identity_public_key());
ASSERT_EQ("pcr0_quote", default_identity_data.pcr_quotes().at(0).quote());
EXPECT_EQ("pcr0_quote", db.pcr0_quote().quote());
ASSERT_EQ("pcr1_quote", default_identity_data.pcr_quotes().at(1).quote());
EXPECT_EQ("pcr1_quote", db.pcr1_quote().quote());
// No other identity has been created.
ASSERT_EQ(1, db.identities().size());
// The identity credential was migrated into an identity certificate.
// As a result, identity data does not use the identity credential. The
// deprecated field has not been cleared so that older code can still
// use the database.
ASSERT_FALSE(default_identity_data.identity_key().has_identity_credential());
ASSERT_EQ("identity_cred", db.identity_key().identity_credential());
VerifyPCAData(db, "identity_cred");
// Attestation is prepared.
EXPECT_TRUE(attestation_.IsPreparedForEnrollment());
}
TEST_F(AttestationBaseTest, MigrateAttestationDatabaseWithCorruptedFields) {
// Simulate first login.
attestation_.PrepareForEnrollment();
// Simulate an older database.
AttestationDatabase db = GetPersistentDatabase();
db.mutable_credentials()->clear_encrypted_endorsement_credentials();
db.mutable_credentials()->set_endorsement_credential("endorsement_cred");
EncryptedData default_encrypted_endorsement_credential;
default_encrypted_endorsement_credential.set_wrapped_key("default_key");
db.mutable_credentials()
->mutable_default_encrypted_endorsement_credential()
->CopyFrom(default_encrypted_endorsement_credential);
db.clear_identities();
db.clear_identity_certificates();
db.mutable_identity_binding()->set_identity_binding("identity_binding");
db.mutable_identity_binding()->set_identity_public_key("identity_public_key");
db.mutable_identity_key()->set_identity_credential("identity_cred");
// Note that we are missing a PCR0 quote.
db.mutable_pcr1_quote()->set_quote("pcr1_quote");
// Persist that older database.
attestation_.PersistDatabase(db);
// Simulate second login.
Initialize();
attestation_.PrepareForEnrollment();
db = GetPersistentDatabase();
// The default encrypted endorsement credential has been migrated.
// The deprecated field has not been cleared so that older code can still
// use the database.
ASSERT_TRUE(MessageDifferencer::Equals(
default_encrypted_endorsement_credential,
db.credentials().encrypted_endorsement_credentials().at(
Attestation::kDefaultPCA)));
ASSERT_TRUE(MessageDifferencer::Equals(
default_encrypted_endorsement_credential,
db.credentials().default_encrypted_endorsement_credential()));
// The default identity is copied from the deprecated database after
// re-generating the PCR0 quote.
// The deprecated fields have not been cleared so that older code can still
// use the database.
ASSERT_EQ(1, db.identities().size());
ASSERT_EQ("identity_binding", db.identity_binding().identity_binding());
ASSERT_EQ("identity_public_key", db.identity_binding().identity_public_key());
EXPECT_EQ("pcr1_quote", db.pcr1_quote().quote());
// Check the migrated identity after re-generating the PCR0 quote is
// correct.
const AttestationDatabase::Identity& default_identity_data =
db.identities().Get(Attestation::kDefaultPCA);
ASSERT_EQ("identity_binding",
default_identity_data.identity_binding().identity_binding());
ASSERT_EQ("identity_public_key",
default_identity_data.identity_binding().identity_public_key());
ASSERT_EQ("pcr1_quote", default_identity_data.pcr_quotes().at(1).quote());
ASSERT_TRUE(default_identity_data.pcr_quotes().at(0).has_quote());
// There is no identity certificate since there is no identity.
ASSERT_EQ(db.identity_certificates().size(), 1);
}
TEST_F(AttestationBaseTest,
MigrateAttestationDatabaseAllEndorsementCredentials) {
// Simulate first login.
attestation_.PrepareForEnrollment();
// Simulate an older database.
AttestationDatabase db = GetPersistentDatabase();
db.mutable_credentials()->clear_encrypted_endorsement_credentials();
db.mutable_credentials()->set_endorsement_credential("endorsement_cred");
EncryptedData default_encrypted_endorsement_credential;
default_encrypted_endorsement_credential.set_wrapped_key("default_key");
db.mutable_credentials()
->mutable_default_encrypted_endorsement_credential()
->CopyFrom(default_encrypted_endorsement_credential);
EncryptedData test_encrypted_endorsement_credential;
test_encrypted_endorsement_credential.set_wrapped_key("test_key");
db.mutable_credentials()
->mutable_test_encrypted_endorsement_credential()
->CopyFrom(test_encrypted_endorsement_credential);
db.clear_identities();
db.clear_identity_certificates();
db.mutable_identity_binding()->set_identity_binding("identity_binding");
db.mutable_identity_binding()->set_identity_public_key("identity_public_key");
db.mutable_identity_key()->set_identity_credential("identity_cred");
db.mutable_pcr0_quote()->set_quote("pcr0_quote");
db.mutable_pcr1_quote()->set_quote("pcr1_quote");
// Persist that older database.
attestation_.PersistDatabase(db);
// Simulate second login.
Initialize();
attestation_.PrepareForEnrollment();
db = GetPersistentDatabase();
// The encrypted endorsement credentials have both been migrated.
// The deprecated fields have not been cleared so that older code can still
// use the database.
ASSERT_TRUE(MessageDifferencer::Equals(
default_encrypted_endorsement_credential,
db.credentials().encrypted_endorsement_credentials().at(
Attestation::kDefaultPCA)));
ASSERT_TRUE(MessageDifferencer::Equals(
default_encrypted_endorsement_credential,
db.credentials().default_encrypted_endorsement_credential()));
ASSERT_TRUE(MessageDifferencer::Equals(
test_encrypted_endorsement_credential,
db.credentials().encrypted_endorsement_credentials().at(
Attestation::kTestPCA)));
ASSERT_TRUE(MessageDifferencer::Equals(
test_encrypted_endorsement_credential,
db.credentials().test_encrypted_endorsement_credential()));
// Attestation is prepared.
EXPECT_TRUE(attestation_.IsPreparedForEnrollment());
}
TEST_F(AttestationBaseTest, CertChainWithNoIntermediateCA) {
EXPECT_CALL(key_store_, Read(true, kTestUser, "test", _))
.WillRepeatedly(DoAll(
SetArgPointee<3>(GetCertifiedKeyBlob("", false)),
Return(true)));
SecureBlob blob;
EXPECT_TRUE(attestation_.GetCertificateChain(true, kTestUser, "test",
&blob));
EXPECT_TRUE(CompareBlob(blob, EncodeCertChain("stored_cert", "")));
}
TEST_F(AttestationBaseTest, IdentityResetRequest) {
SecureBlob blob;
EXPECT_TRUE(attestation_.GetIdentityResetRequest("token", &blob));
attestation_.PrepareForEnrollment();
EXPECT_TRUE(attestation_.GetIdentityResetRequest("token", &blob));
}
// A test class which does not initialize the Attestation instance.
class AttestationBaseTestNoInitialize : public AttestationBaseTest {
public:
void Initialize() override {}
};
TEST_F(AttestationBaseTestNoInitialize, AutoExtendPCR1) {
Blob default_pcr(GetDigestSize());
EXPECT_CALL(tpm_, ReadPCR(1, _))
.WillOnce(DoAll(SetArgPointee<1>(default_pcr), Return(true)));
std::string fake_hwid = "hwid";
Blob fake_hwid_expected_extension;
ASSERT_TRUE(base::HexStringToBytes(
"bc45e91a086497cd817cb3024ac5c0d733111a74378257b11991e1e435b7e71e",
&fake_hwid_expected_extension));
fake_hwid_expected_extension.resize(GetDigestSize());
EXPECT_CALL(tpm_, ExtendPCR(1, fake_hwid_expected_extension))
.WillOnce(Return(true));
EXPECT_CALL(platform_, GetHardwareID()).WillRepeatedly(Return(fake_hwid));
// Now initialize and the mocks will complain if PCR1 is not extended.
AttestationBaseTest::Initialize();
}
TEST_F(AttestationBaseTestNoInitialize, AutoExtendPCR1NoHwID) {
Blob default_pcr(GetDigestSize());
EXPECT_CALL(tpm_, ReadPCR(1, _))
.WillOnce(DoAll(SetArgPointee<1>(default_pcr), Return(true)));
std::string no_hwid = "";
EXPECT_CALL(tpm_, ExtendPCR(_, _)).Times(0);
EXPECT_CALL(platform_, GetHardwareID()).WillRepeatedly(Return(no_hwid));
// Now initialize and the mocks will complain if PCR1 is extended.
AttestationBaseTest::Initialize();
}
class AttestationEnrollmentIdTest : public AttestationBaseTest {
public:
void Initialize() override {
SecureBlob abe_data;
EXPECT_TRUE(brillo::SecureBlob::HexStringToSecureBlob(kABEData,
&abe_data));
attestation_.Initialize(&tpm_, &tpm_init_, &platform_, &crypto_,
&install_attributes_, abe_data,
false /* retain_endorsement_data */);
}
};
TEST_F(AttestationEnrollmentIdTest, GetEnterpriseEnrollmentId) {
brillo::SecureBlob pubek(GetValidEndorsementKey());
EXPECT_CALL(tpm_, GetEndorsementPublicKey(_))
.WillRepeatedly(DoAll(SetArgPointee<0>(pubek),
Return(Tpm::kTpmRetryNone)));
brillo::SecureBlob blob;
EXPECT_TRUE(attestation_.GetEnterpriseEnrollmentId(&blob));
EXPECT_EQ(kEID,
base::ToLowerASCII(base::HexEncode(blob.data(), blob.size())));
}
TEST_F(AttestationEnrollmentIdTest, GetEnterpriseEnrollmentIdCached) {
brillo::SecureBlob pubek(GetValidEndorsementKey());
EXPECT_CALL(tpm_, GetEndorsementPublicKey(_))
.WillRepeatedly(DoAll(SetArgPointee<0>(pubek),
Return(Tpm::kTpmRetryNone)));
attestation_.PrepareForEnrollment();
SecureBlob enroll_blob;
EXPECT_TRUE(attestation_.CreateEnrollRequest(Attestation::kDefaultPCA,
&enroll_blob));
attestation_.Enroll(Attestation::kDefaultPCA, GetEnrollBlob());
// Change abe_data.
attestation_.Initialize(
&tpm_, &tpm_init_, &platform_, &crypto_, &install_attributes_,
brillo::SecureBlob("new_abe_data"), false /* retain_endorsement_data */);
// GetEnterpriseEnrollmentId should return a cached EID.
brillo::SecureBlob blob;
EXPECT_TRUE(attestation_.GetEnterpriseEnrollmentId(&blob));
EXPECT_EQ(kEID,
base::ToLowerASCII(base::HexEncode(blob.data(), blob.size())));
// The EID should be different if recomputed since the abe_data has changed.
EXPECT_CALL(tpm_, GetEndorsementPublicKeyWithDelegate(_, _, _))
.WillRepeatedly(DoAll(SetArgPointee<0>(pubek),
Return(Tpm::kTpmRetryNone)));
EXPECT_TRUE(attestation_.ComputeEnterpriseEnrollmentId(&blob));
EXPECT_NE(kEID,
base::ToLowerASCII(base::HexEncode(blob.data(), blob.size())));
}
TEST_F(AttestationEnrollmentIdTest, ComputeEnterpriseEnrollmentId) {
brillo::SecureBlob pubek(GetValidEndorsementKey());
EXPECT_CALL(tpm_, GetEndorsementPublicKey(_))
.WillOnce(DoAll(SetArgPointee<0>(pubek),
Return(Tpm::kTpmRetryNone)));
brillo::SecureBlob blob;
EXPECT_TRUE(ComputeEnterpriseEnrollmentId(&blob));
EXPECT_EQ(kEID,
base::ToLowerASCII(base::HexEncode(blob.data(), blob.size())));
}
TEST_F(AttestationEnrollmentIdTest, ComputeEnterpriseEnrollmentIdHasDelegate) {
attestation_.PrepareForEnrollment();
brillo::SecureBlob pubek(GetValidEndorsementKey());
EXPECT_CALL(tpm_, GetEndorsementPublicKeyWithDelegate(_, _, _))
.WillOnce(DoAll(SetArgPointee<0>(pubek), Return(Tpm::kTpmRetryNone)));
brillo::SecureBlob blob;
EXPECT_TRUE(ComputeEnterpriseEnrollmentId(&blob));
EXPECT_EQ(kEID,
base::ToLowerASCII(base::HexEncode(blob.data(), blob.size())));
}
TEST_F(AttestationEnrollmentIdTest,
ComputeEnterpriseEnrollmentIdHasDelegateWithTemporaryFailure) {
attestation_.PrepareForEnrollment();
brillo::SecureBlob pubek_empty("");
brillo::SecureBlob pubek(GetValidEndorsementKey());
EXPECT_CALL(tpm_, GetEndorsementPublicKeyWithDelegate(_, _, _))
.WillOnce(DoAll(SetArgPointee<0>(pubek_empty),
Return(Tpm::kTpmRetryLater)))
.WillOnce(DoAll(SetArgPointee<0>(pubek), Return(Tpm::kTpmRetryNone)));
brillo::SecureBlob blob;
EXPECT_FALSE(ComputeEnterpriseEnrollmentId(&blob)); // Initial try.
EXPECT_TRUE(blob.empty());
EXPECT_TRUE(ComputeEnterpriseEnrollmentId(&blob)); // Retry.
EXPECT_EQ(kEID,
base::ToLowerASCII(base::HexEncode(blob.data(), blob.size())));
}
TEST_F(AttestationEnrollmentIdTest,
ComputeEnterpriseEnrollmentIdHasDelegateWithoutPermissions) {
attestation_.PrepareForEnrollment();
GetMutableDatabase().mutable_delegate()->clear_can_read_internal_pub();
brillo::SecureBlob pubek("");
EXPECT_CALL(tpm_, GetEndorsementPublicKeyWithDelegate(_, _, _))
.WillOnce(DoAll(SetArgPointee<0>(pubek),
Return(Tpm::kTpmRetryFailNoRetry)));
brillo::SecureBlob blob;
EXPECT_TRUE(ComputeEnterpriseEnrollmentId(&blob));
EXPECT_TRUE(blob.empty());
EXPECT_TRUE(GetPersistentDatabase().delegate().has_can_read_internal_pub());
EXPECT_FALSE(GetPersistentDatabase().delegate().can_read_internal_pub());
}
TEST_F(AttestationEnrollmentIdTest,
ComputeEnterpriseEnrollmentIdHasDelegateWithoutPermissionsButNoOwner) {
attestation_.PrepareForEnrollment();
GetMutableDatabase().mutable_delegate()->clear_can_read_internal_pub();
brillo::SecureBlob pubek_empty("");
brillo::SecureBlob pubek(GetValidEndorsementKey());
EXPECT_CALL(tpm_, GetEndorsementPublicKeyWithDelegate(_, _, _))
.WillRepeatedly(DoAll(SetArgPointee<0>(pubek_empty),
Return(Tpm::kTpmRetryFailNoRetry)));
EXPECT_CALL(tpm_, GetEndorsementPublicKey(_))
.WillOnce(DoAll(SetArgPointee<0>(pubek),
Return(Tpm::kTpmRetryNone)));
brillo::SecureBlob blob;
EXPECT_TRUE(ComputeEnterpriseEnrollmentId(&blob)); // Owner succeeds.
EXPECT_EQ(kEID,
base::ToLowerASCII(base::HexEncode(blob.data(), blob.size())));
EXPECT_TRUE(GetPersistentDatabase().delegate().has_can_read_internal_pub());
EXPECT_FALSE(GetPersistentDatabase().delegate().can_read_internal_pub());
}
TEST_F(AttestationEnrollmentIdTest,
ComputeEnterpriseEnrollmentIdHasDelegateKnownToBeWithoutPermissions) {
attestation_.PrepareForEnrollment();
GetMutableDatabase().mutable_delegate()->set_can_read_internal_pub(false);
brillo::SecureBlob pubek("");
EXPECT_CALL(tpm_, GetEndorsementPublicKey(_))
.WillOnce(DoAll(SetArgPointee<0>(pubek),
Return(Tpm::kTpmRetryFailNoRetry)));
brillo::SecureBlob blob;
EXPECT_TRUE(ComputeEnterpriseEnrollmentId(&blob));
EXPECT_TRUE(blob.empty());