| // Copyright 2015 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. |
| |
| // Contains the implementation of class Tpm |
| |
| #include "cryptohome/tpm2_impl.h" |
| |
| #include <map> |
| #include <memory> |
| #include <string> |
| #include <utility> |
| #include <vector> |
| |
| #include <base/bind.h> |
| #include <base/logging.h> |
| #include <base/numerics/safe_conversions.h> |
| #include <crypto/libcrypto-compat.h> |
| #include <crypto/scoped_openssl_types.h> |
| #include <openssl/bn.h> |
| #include <openssl/evp.h> |
| #include <openssl/rsa.h> |
| #include <openssl/x509.h> |
| #include <tpm_manager-client/tpm_manager/dbus-constants.h> |
| #include <trunks/authorization_delegate.h> |
| #include <trunks/blob_parser.h> |
| #include <trunks/error_codes.h> |
| #include <trunks/policy_session.h> |
| #include <trunks/tpm_alerts.h> |
| #include <trunks/tpm_constants.h> |
| #include <trunks/trunks_dbus_proxy.h> |
| #include <trunks/trunks_factory.h> |
| #include <trunks/trunks_factory_impl.h> |
| |
| #include "cryptohome/cryptolib.h" |
| |
| using brillo::Blob; |
| using brillo::BlobFromString; |
| using brillo::BlobToString; |
| using brillo::SecureBlob; |
| using trunks::GetErrorString; |
| using trunks::TPM_RC; |
| using trunks::TPM_RC_SUCCESS; |
| using trunks::TrunksFactory; |
| |
| namespace cryptohome { |
| |
| namespace { |
| |
| // The upper bits that identify the layer that produced the response. |
| // These bits are always 0 for the hardware TPM response codes. |
| constexpr TPM_RC kResponseLayerMask = 0xFFFFF000; |
| |
| // Cr50 vendor command error codes. |
| constexpr TPM_RC kVendorRC = 0x500; |
| constexpr TPM_RC kCr50ErrorNoSuchCommand = kVendorRC + 0x7F; |
| |
| Tpm::TpmRetryAction ResultToRetryAction(TPM_RC result) { |
| // For hardware TPM errors and TPM-equivalent response codes produced by |
| // Resource Manager, use just the error number and strip everything else. |
| if ((result & kResponseLayerMask) == 0 || |
| (result & kResponseLayerMask) == trunks::kResourceManagerTpmErrorBase) { |
| result = trunks::GetFormatOneError(result & ~kResponseLayerMask); |
| } |
| Tpm::TpmRetryAction action; |
| switch (result) { |
| case trunks::TPM_RC_SUCCESS: |
| action = Tpm::kTpmRetryNone; |
| break; |
| case trunks::TPM_RC_LOCKOUT: |
| action = Tpm::kTpmRetryDefendLock; |
| break; |
| case trunks::TPM_RC_HANDLE: |
| case trunks::TPM_RC_REFERENCE_H0: |
| case trunks::TPM_RC_REFERENCE_H1: |
| case trunks::TPM_RC_REFERENCE_H2: |
| case trunks::TPM_RC_REFERENCE_H3: |
| case trunks::TPM_RC_REFERENCE_H4: |
| case trunks::TPM_RC_REFERENCE_H5: |
| case trunks::TPM_RC_REFERENCE_H6: |
| action = Tpm::kTpmRetryInvalidHandle; |
| break; |
| case trunks::TPM_RC_INITIALIZE: |
| case trunks::TPM_RC_REBOOT: |
| action = Tpm::kTpmRetryReboot; |
| break; |
| case trunks::TRUNKS_RC_WRITE_ERROR: |
| case trunks::TRUNKS_RC_READ_ERROR: |
| case trunks::SAPI_RC_NO_CONNECTION: |
| case trunks::SAPI_RC_NO_RESPONSE_RECEIVED: |
| case trunks::SAPI_RC_MALFORMED_RESPONSE: |
| action = Tpm::kTpmRetryCommFailure; |
| break; |
| case trunks::TPM_RC_RETRY: |
| case trunks::TPM_RC_NV_RATE: |
| action = Tpm::kTpmRetryLater; |
| break; |
| default: |
| action = Tpm::kTpmRetryFailNoRetry; |
| break; |
| } |
| return action; |
| } |
| |
| // Sets owner_dependency field in RemoveOwnerDependencyRequest based on |
| // the provided TpmPersistentState::TpmOwnerDependency value |
| void SetOwnerDependency(TpmPersistentState::TpmOwnerDependency dependency, |
| std::string* dependency_field) { |
| switch (dependency) { |
| case TpmPersistentState::TpmOwnerDependency::kInstallAttributes: |
| dependency_field->assign(tpm_manager::kTpmOwnerDependency_Nvram); |
| break; |
| case TpmPersistentState::TpmOwnerDependency::kAttestation: |
| dependency_field->assign(tpm_manager::kTpmOwnerDependency_Attestation); |
| break; |
| default: |
| dependency_field->clear(); |
| break; |
| } |
| } |
| |
| // Returns the total number of bits set in the first |size| elements from |
| // |array|. |
| int CountSetBits(const uint8_t* array, size_t size) { |
| int res = 0; |
| for (size_t i = 0; i < size; ++i) { |
| for (int bit_position = 0; bit_position < 8; ++bit_position) { |
| if ((array[i] & (1 << bit_position)) != 0) { |
| ++res; |
| } |
| } |
| } |
| return res; |
| } |
| |
| } // namespace |
| |
| // Keep it with sync to UMA enum list |
| // https://chromium.googlesource.com/chromium/src/+/master/tools/metrics/histograms/enums.xml |
| // These values are persisted to logs, and should therefore never be renumbered |
| // nor reused. |
| enum TpmAlerts { |
| kCamoBreach = 1, |
| kDmemParity = 2, |
| kDrfParity = 3, |
| kImemParity = 4, |
| kPgmFault = 5, |
| kCpuDIfBusError = 6, |
| kCpuDIfUpdateWatchdog = 7, |
| kCpuIIfBusError = 8, |
| kCpuIIfUpdateWatchdog = 9, |
| kCpuSIfBusError = 10, |
| kCpuSIfUpdateWatchdog = 11, |
| kDmaIfBusErr = 12, |
| kDmaIfUpdateWatchdog = 13, |
| kSpsIfBusErr = 14, |
| kSpsIfUpdateWatchdog = 15, |
| kUsbIfBusErr = 16, |
| kUsbIfUpdateWatchdog = 17, |
| kFuseDefaults = 18, |
| kDiffFail = 19, |
| kSoftwareAlert0 = 20, |
| kSoftwareAlert1 = 21, |
| kSoftwareAlert2 = 22, |
| kSoftwareAlert3 = 23, |
| kHearbitFail = 24, |
| kProcOpcodeHash = 25, |
| kSramParityScrub = 26, |
| kAesExecCtrMax = 27, |
| kAesHkey = 28, |
| kCertLookup = 29, |
| kFlashEntry = 30, |
| kPw = 31, |
| kShaExecCtrMax = 32, |
| kShaFault = 33, |
| kShaHkey = 34, |
| kPmuBatteryMon = 35, |
| kPmuWatchdog = 36, |
| kRtcDead = 37, |
| kTempMax = 38, |
| kTempMaxDiff = 39, |
| kTempMin = 40, |
| kRngOutOfSpec = 41, |
| kRngTimeout = 42, |
| kVoltageError = 43, |
| kXoJitteryTrim = 44, |
| |
| kTPMAlertNumBuckets, // Must be the last entry. |
| }; |
| static_assert(kTPMAlertNumBuckets <= trunks::kAlertsMaxSize + 1, |
| "Number of UMA enums less than alerts set size"); |
| |
| // Maps alerts identifiers received from TMP firmware to UMA identifiers |
| const TpmAlerts h1AlertsMap[trunks::kH1AlertsSize] = { |
| kCamoBreach, |
| kDmemParity, |
| kDrfParity, |
| kImemParity, |
| kPgmFault, |
| kCpuDIfBusError, |
| kCpuDIfUpdateWatchdog, |
| kCpuIIfBusError, |
| kCpuIIfUpdateWatchdog, |
| kCpuSIfBusError, |
| kCpuSIfUpdateWatchdog, |
| kDmaIfBusErr, |
| kDmaIfUpdateWatchdog, |
| kSpsIfBusErr, |
| kSpsIfUpdateWatchdog, |
| kUsbIfBusErr, |
| kUsbIfUpdateWatchdog, |
| kFuseDefaults, |
| kDiffFail, |
| kSoftwareAlert0, |
| kSoftwareAlert1, |
| kSoftwareAlert2, |
| kSoftwareAlert3, |
| kHearbitFail, |
| kProcOpcodeHash, |
| kSramParityScrub, |
| kAesExecCtrMax, |
| kAesHkey, |
| kCertLookup, |
| kFlashEntry, |
| kPw, |
| kShaExecCtrMax, |
| kShaFault, |
| kShaHkey, |
| kPmuBatteryMon, |
| kPmuWatchdog, |
| kRtcDead, |
| kTempMax, |
| kTempMaxDiff, |
| kTempMin, |
| kRngOutOfSpec, |
| kRngTimeout, |
| kVoltageError, |
| kXoJitteryTrim, |
| }; |
| |
| Tpm2Impl::Tpm2Impl(TrunksFactory* factory, |
| tpm_manager::TpmOwnershipInterface* tpm_owner, |
| tpm_manager::TpmNvramInterface* tpm_nvram) |
| : has_external_trunks_context_(true), |
| tpm_owner_(tpm_owner), |
| tpm_nvram_(tpm_nvram) { |
| external_trunks_context_.factory = factory; |
| external_trunks_context_.tpm_state = factory->GetTpmState(); |
| external_trunks_context_.tpm_utility = factory->GetTpmUtility(); |
| } |
| |
| bool Tpm2Impl::GetOwnerPassword(brillo::SecureBlob* owner_password) { |
| if (!UpdateTpmStatus(RefreshType::REFRESH_IF_NEEDED)) { |
| return false; |
| } |
| SecureBlob tmp(tpm_status_.local_data().owner_password()); |
| owner_password->swap(tmp); |
| return true; |
| } |
| |
| void Tpm2Impl::SetOwnerPassword(const SecureBlob& /* owner_password */) { |
| LOG(ERROR) << __func__ << ": Not implemented."; |
| } |
| |
| bool Tpm2Impl::IsEnabled() { |
| if (!UpdateTpmStatus(RefreshType::REFRESH_IF_NEEDED)) { |
| return false; |
| } |
| return tpm_status_.enabled(); |
| } |
| |
| void Tpm2Impl::SetIsEnabled(bool /* enabled */) { |
| LOG(ERROR) << __func__ << ": Not implemented."; |
| } |
| |
| bool Tpm2Impl::IsOwned() { |
| if (is_owned_ || has_checked_owned_) { |
| return is_owned_; |
| } |
| |
| if (!UpdateTpmStatus(RefreshType::REFRESH_IF_NEEDED)) { |
| return false; |
| } |
| |
| has_checked_owned_ = true; |
| is_owned_ = tpm_status_.owned(); |
| return is_owned_; |
| } |
| |
| void Tpm2Impl::SetIsOwned(bool /* owned */) { |
| LOG(ERROR) << __func__ << ": Not implemented."; |
| } |
| |
| bool Tpm2Impl::PerformEnabledOwnedCheck(bool* enabled, bool* owned) { |
| if (!UpdateTpmStatus(RefreshType::REFRESH_IF_NEEDED)) { |
| return false; |
| } |
| if (enabled) { |
| *enabled = tpm_status_.enabled(); |
| } |
| if (owned) { |
| *owned = tpm_status_.owned(); |
| } |
| return true; |
| } |
| |
| bool Tpm2Impl::IsInitialized() { |
| return UpdateTpmStatus(RefreshType::REFRESH_IF_NEEDED); |
| } |
| |
| void Tpm2Impl::SetIsInitialized(bool done) { |
| LOG(ERROR) << __func__ << ": Not implemented."; |
| } |
| |
| bool Tpm2Impl::IsBeingOwned() { |
| return is_being_owned_; |
| } |
| |
| void Tpm2Impl::SetIsBeingOwned(bool value) { |
| is_being_owned_ = value; |
| } |
| |
| bool Tpm2Impl::GetRandomDataBlob(size_t length, brillo::Blob* data) { |
| brillo::SecureBlob blob(length); |
| if (!this->GetRandomDataSecureBlob(length, &blob)) { |
| LOG(ERROR) << "GetRandomDataBlob failed"; |
| return false; |
| } |
| data->assign(blob.begin(), blob.end()); |
| return true; |
| } |
| |
| bool Tpm2Impl::GetRandomDataSecureBlob(size_t length, |
| brillo::SecureBlob* data) { |
| CHECK(data); |
| TrunksClientContext* trunks; |
| if (!GetTrunksContext(&trunks)) { |
| return false; |
| } |
| std::string random_data; |
| TPM_RC result = |
| trunks->tpm_utility->GenerateRandom(length, |
| nullptr, // No authorization. |
| &random_data); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error getting random data: " << GetErrorString(result); |
| return false; |
| } |
| if (random_data.size() != length) { |
| LOG(ERROR) << "Error getting random data: requested length " << length |
| << ", received length " << random_data.size(); |
| return false; |
| } |
| data->assign(random_data.begin(), random_data.end()); |
| return true; |
| } |
| |
| bool Tpm2Impl::GetAlertsData(Tpm::AlertsData* alerts) { |
| TrunksClientContext* trunks; |
| if (!GetTrunksContext(&trunks)) { |
| return true; |
| } |
| |
| trunks::TpmAlertsData trunks_alerts; |
| TPM_RC result = trunks->tpm_utility->GetAlertsData(&trunks_alerts); |
| if (result == trunks::TPM_RC_NO_SUCH_COMMAND) { |
| LOG(INFO) << "TPM GetAlertsData vendor command is not implemented"; |
| return false; |
| } else if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error getting alerts data: " << GetErrorString(result); |
| memset(alerts, 0, sizeof(Tpm::AlertsData)); |
| return true; |
| } else if (trunks_alerts.chip_family != trunks::kFamilyH1) { |
| // Currently we support only H1 alerts |
| LOG(ERROR) << "Unknown alerts family: " << trunks_alerts.chip_family; |
| return false; |
| } |
| |
| memset(alerts, 0, sizeof(Tpm::AlertsData)); |
| for (int i = 0; i < trunks_alerts.alerts_num; i++) { |
| size_t uma_idx = h1AlertsMap[i]; |
| if (uma_idx <= 0 || uma_idx >= kTPMAlertNumBuckets) { |
| LOG(ERROR) << "Alert index " << i << " maps into invalid UMA enum index " |
| << uma_idx; |
| } else { |
| alerts->counters[uma_idx] = trunks_alerts.counters[i]; |
| } |
| } |
| |
| return true; |
| } |
| |
| bool Tpm2Impl::DefineNvram(uint32_t index, size_t length, uint32_t flags) { |
| if (!InitializeTpmManagerClients()) { |
| return false; |
| } |
| tpm_manager::DefineSpaceRequest request; |
| request.set_index(index); |
| request.set_size(length); |
| if (flags & Tpm::kTpmNvramWriteDefine) { |
| request.add_attributes(tpm_manager::NVRAM_PERSISTENT_WRITE_LOCK); |
| } |
| if (flags & Tpm::kTpmNvramBindToPCR0) { |
| request.set_policy(tpm_manager::NVRAM_POLICY_PCR0); |
| } |
| if (flags & Tpm::kTpmNvramFirmwareReadable) { |
| request.add_attributes(tpm_manager::NVRAM_PLATFORM_READ); |
| } |
| auto method = base::Bind(&tpm_manager::TpmNvramInterface::DefineSpace, |
| base::Unretained(tpm_nvram_), request); |
| tpm_manager::DefineSpaceReply reply; |
| SendTpmManagerRequestAndWait(method, &reply); |
| if (reply.result() != tpm_manager::NVRAM_RESULT_SUCCESS) { |
| LOG(ERROR) << "Failed to define nvram space: " << reply.result(); |
| return false; |
| } |
| return true; |
| } |
| |
| bool Tpm2Impl::DestroyNvram(uint32_t index) { |
| if (!InitializeTpmManagerClients()) { |
| return false; |
| } |
| tpm_manager::DestroySpaceRequest request; |
| request.set_index(index); |
| auto method = base::Bind(&tpm_manager::TpmNvramInterface::DestroySpace, |
| base::Unretained(tpm_nvram_), request); |
| tpm_manager::DestroySpaceReply reply; |
| SendTpmManagerRequestAndWait(method, &reply); |
| if (reply.result() != tpm_manager::NVRAM_RESULT_SUCCESS) { |
| LOG(ERROR) << "Failed to destroy nvram space: " << reply.result(); |
| return false; |
| } |
| return true; |
| } |
| |
| bool Tpm2Impl::WriteNvram(uint32_t index, const SecureBlob& blob) { |
| if (!InitializeTpmManagerClients()) { |
| return false; |
| } |
| tpm_manager::WriteSpaceRequest write_request; |
| write_request.set_index(index); |
| write_request.set_data(blob.to_string()); |
| auto write_method = base::Bind(&tpm_manager::TpmNvramInterface::WriteSpace, |
| base::Unretained(tpm_nvram_), write_request); |
| tpm_manager::WriteSpaceReply write_reply; |
| SendTpmManagerRequestAndWait(write_method, &write_reply); |
| if (write_reply.result() != tpm_manager::NVRAM_RESULT_SUCCESS) { |
| LOG(ERROR) << "Failed to write nvram space: " << write_reply.result(); |
| return false; |
| } |
| return true; |
| } |
| |
| bool Tpm2Impl::ReadNvram(uint32_t index, SecureBlob* blob) { |
| if (!InitializeTpmManagerClients()) { |
| return false; |
| } |
| tpm_manager::ReadSpaceRequest request; |
| request.set_index(index); |
| auto method = base::Bind(&tpm_manager::TpmNvramInterface::ReadSpace, |
| base::Unretained(tpm_nvram_), request); |
| tpm_manager::ReadSpaceReply reply; |
| SendTpmManagerRequestAndWait(method, &reply); |
| if (reply.result() != tpm_manager::NVRAM_RESULT_SUCCESS) { |
| LOG(ERROR) << "Failed to read nvram space: " << reply.result(); |
| return false; |
| } |
| SecureBlob tmp(reply.data()); |
| blob->swap(tmp); |
| return true; |
| } |
| |
| bool Tpm2Impl::IsNvramDefined(uint32_t index) { |
| if (!InitializeTpmManagerClients()) { |
| return false; |
| } |
| auto method = base::Bind(&tpm_manager::TpmNvramInterface::ListSpaces, |
| base::Unretained(tpm_nvram_), |
| tpm_manager::ListSpacesRequest()); |
| tpm_manager::ListSpacesReply reply; |
| SendTpmManagerRequestAndWait(method, &reply); |
| if (reply.result() != tpm_manager::NVRAM_RESULT_SUCCESS) { |
| LOG(ERROR) << "Failed to list nvram spaces: " << reply.result(); |
| return false; |
| } |
| for (int i = 0; i < reply.index_list_size(); ++i) { |
| if (index == reply.index_list(i)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| bool Tpm2Impl::IsNvramLocked(uint32_t index) { |
| if (!InitializeTpmManagerClients()) { |
| return false; |
| } |
| tpm_manager::GetSpaceInfoRequest request; |
| request.set_index(index); |
| auto method = base::Bind(&tpm_manager::TpmNvramInterface::GetSpaceInfo, |
| base::Unretained(tpm_nvram_), request); |
| tpm_manager::GetSpaceInfoReply reply; |
| SendTpmManagerRequestAndWait(method, &reply); |
| if (reply.result() != tpm_manager::NVRAM_RESULT_SUCCESS) { |
| LOG(ERROR) << "Failed to get space info for space " << index << ": " |
| << reply.result(); |
| return false; |
| } |
| return reply.is_write_locked(); |
| } |
| |
| bool Tpm2Impl::WriteLockNvram(uint32_t index) { |
| if (!InitializeTpmManagerClients()) { |
| return false; |
| } |
| tpm_manager::LockSpaceRequest lock_request; |
| lock_request.set_index(index); |
| lock_request.set_lock_write(true); |
| auto lock_method = base::Bind(&tpm_manager::TpmNvramInterface::LockSpace, |
| base::Unretained(tpm_nvram_), lock_request); |
| tpm_manager::LockSpaceReply lock_reply; |
| SendTpmManagerRequestAndWait(lock_method, &lock_reply); |
| if (lock_reply.result() != tpm_manager::NVRAM_RESULT_SUCCESS) { |
| LOG(ERROR) << "Failed to lock nvram space: " << lock_reply.result(); |
| return false; |
| } |
| return true; |
| } |
| |
| unsigned int Tpm2Impl::GetNvramSize(uint32_t index) { |
| if (!InitializeTpmManagerClients()) { |
| return false; |
| } |
| tpm_manager::GetSpaceInfoRequest request; |
| request.set_index(index); |
| auto method = base::Bind(&tpm_manager::TpmNvramInterface::GetSpaceInfo, |
| base::Unretained(tpm_nvram_), request); |
| tpm_manager::GetSpaceInfoReply reply; |
| SendTpmManagerRequestAndWait(method, &reply); |
| if (reply.result() != tpm_manager::NVRAM_RESULT_SUCCESS) { |
| LOG(ERROR) << "Failed to get space info for space " << index << ": " |
| << reply.result(); |
| return 0; |
| } |
| return reply.size(); |
| } |
| |
| bool Tpm2Impl::IsEndorsementKeyAvailable() { |
| LOG(ERROR) << __func__ << ": Not implemented."; |
| return true; |
| } |
| |
| bool Tpm2Impl::CreateEndorsementKey() { |
| LOG(ERROR) << __func__ << ": Not implemented."; |
| return false; |
| } |
| |
| Tpm::TpmRetryAction Tpm2Impl::GetEndorsementPublicKey( |
| SecureBlob* ek_public_key) { |
| LOG(ERROR) << __func__ << ": Not implemented."; |
| return Tpm::kTpmRetryFailNoRetry; |
| } |
| |
| Tpm::TpmRetryAction Tpm2Impl::GetEndorsementPublicKeyWithDelegate( |
| brillo::SecureBlob* ek_public_key, |
| const brillo::Blob& delegate_blob, |
| const brillo::Blob& delegate_secret) { |
| LOG(ERROR) << __func__ << ": Not implemented."; |
| return Tpm::kTpmRetryFailNoRetry; |
| } |
| |
| bool Tpm2Impl::GetEndorsementCredential(SecureBlob* credential) { |
| LOG(ERROR) << __func__ << ": Not implemented."; |
| return false; |
| } |
| |
| bool Tpm2Impl::MakeIdentity(SecureBlob* identity_public_key_der, |
| SecureBlob* identity_public_key, |
| SecureBlob* identity_key_blob, |
| SecureBlob* identity_binding, |
| SecureBlob* identity_label, |
| SecureBlob* pca_public_key, |
| SecureBlob* endorsement_credential, |
| SecureBlob* platform_credential, |
| SecureBlob* conformance_credential) { |
| LOG(ERROR) << __func__ << ": Not implemented."; |
| return false; |
| } |
| |
| Tpm::QuotePcrResult Tpm2Impl::QuotePCR(uint32_t pcr_index, |
| bool check_pcr_value, |
| const SecureBlob& identity_key_blob, |
| const SecureBlob& external_data, |
| Blob* pcr_value, |
| SecureBlob* quoted_data, |
| SecureBlob* quote) { |
| LOG(ERROR) << __func__ << ": Not implemented."; |
| return Tpm::QuotePcrResult::kFailure; |
| } |
| |
| bool Tpm2Impl::SealToPCR0(const brillo::SecureBlob& value, |
| brillo::SecureBlob* sealed_value) { |
| TrunksClientContext* trunks; |
| if (!GetTrunksContext(&trunks)) { |
| return false; |
| } |
| std::string policy_digest; |
| TPM_RC result = |
| trunks->tpm_utility->GetPolicyDigestForPcrValues( |
| std::map<uint32_t, std::string>({{0, ""}}), |
| false /* use_auth_value */, &policy_digest); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error getting policy digest: " << GetErrorString(result); |
| return false; |
| } |
| std::unique_ptr<trunks::HmacSession> session = |
| trunks->factory->GetHmacSession(); |
| if (trunks->tpm_utility->StartSession(session.get()) != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error starting hmac session."; |
| return false; |
| } |
| std::string data_to_seal(value.begin(), value.end()); |
| std::string sealed_data; |
| result = trunks->tpm_utility->SealData(data_to_seal, policy_digest, "", |
| session->GetDelegate(), &sealed_data); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error sealing data to PCR0: " << GetErrorString(result); |
| return false; |
| } |
| sealed_value->assign(sealed_data.begin(), sealed_data.end()); |
| return true; |
| } |
| |
| bool Tpm2Impl::Unseal(const brillo::SecureBlob& sealed_value, |
| brillo::SecureBlob* value) { |
| TrunksClientContext* trunks; |
| if (!GetTrunksContext(&trunks)) { |
| return false; |
| } |
| std::unique_ptr<trunks::PolicySession> policy_session = |
| trunks->factory->GetPolicySession(); |
| TPM_RC result = policy_session->StartUnboundSession(true, false); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error starting policy session: " << GetErrorString(result); |
| return false; |
| } |
| result = policy_session->PolicyPCR( |
| std::map<uint32_t, std::string>({{0, ""}})); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error restricting policy to pcr 0: " |
| << GetErrorString(result); |
| return false; |
| } |
| std::string sealed_data(sealed_value.begin(), sealed_value.end()); |
| std::string unsealed_data; |
| result = trunks->tpm_utility->UnsealData( |
| sealed_data, policy_session->GetDelegate(), &unsealed_data); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error unsealing object: " << GetErrorString(result); |
| return false; |
| } |
| value->assign(unsealed_data.begin(), unsealed_data.end()); |
| return true; |
| } |
| |
| bool Tpm2Impl::CreateCertifiedKey(const SecureBlob& identity_key_blob, |
| const SecureBlob& external_data, |
| SecureBlob* certified_public_key, |
| SecureBlob* certified_public_key_der, |
| SecureBlob* certified_key_blob, |
| SecureBlob* certified_key_info, |
| SecureBlob* certified_key_proof) { |
| LOG(ERROR) << __func__ << ": Not implemented."; |
| return false; |
| } |
| |
| bool Tpm2Impl::CreateDelegate(const std::set<uint32_t>& bound_pcrs, |
| uint8_t delegate_family_label, |
| uint8_t delegate_label, |
| Blob* delegate_blob, |
| Blob* delegate_secret) { |
| LOG(ERROR) << __func__ << ": Not implemented."; |
| return false; |
| } |
| |
| bool Tpm2Impl::ActivateIdentity(const brillo::Blob& delegate_blob, |
| const brillo::Blob& delegate_secret, |
| const SecureBlob& identity_key_blob, |
| const SecureBlob& encrypted_asym_ca, |
| const SecureBlob& encrypted_sym_ca, |
| SecureBlob* identity_credential) { |
| LOG(ERROR) << __func__ << ": Not implemented."; |
| return false; |
| } |
| |
| bool Tpm2Impl::TakeOwnership(int max_timeout_tries, |
| const SecureBlob& owner_password) { |
| if (!InitializeTpmManagerClients()) { |
| return false; |
| } |
| auto method = base::Bind(&tpm_manager::TpmOwnershipInterface::TakeOwnership, |
| base::Unretained(tpm_owner_), |
| tpm_manager::TakeOwnershipRequest()); |
| tpm_manager::TakeOwnershipReply reply; |
| SendTpmManagerRequestAndWait(method, &reply); |
| return (reply.status() == tpm_manager::STATUS_SUCCESS); |
| } |
| |
| bool Tpm2Impl::InitializeSrk(const SecureBlob& owner_password) { |
| // Not necessary, tpm_managerd takes care of all this. |
| LOG(WARNING) << __func__ << ": Not implemented."; |
| return true; |
| } |
| |
| bool Tpm2Impl::ChangeOwnerPassword(const SecureBlob& previous_owner_password, |
| const SecureBlob& owner_password) { |
| LOG(ERROR) << __func__ << ": Not implemented."; |
| return false; |
| } |
| |
| bool Tpm2Impl::TestTpmAuth(const SecureBlob& owner_password) { |
| LOG(ERROR) << __func__ << ": Not implemented."; |
| return false; |
| } |
| |
| bool Tpm2Impl::Sign(const SecureBlob& key_blob, |
| const SecureBlob& input, |
| uint32_t bound_pcr_index, |
| SecureBlob* signature) { |
| TrunksClientContext* trunks; |
| if (!GetTrunksContext(&trunks)) { |
| return false; |
| } |
| trunks::AuthorizationDelegate* delegate; |
| std::unique_ptr<trunks::PolicySession> policy_session; |
| std::unique_ptr<trunks::HmacSession> hmac_session; |
| TPM_RC result; |
| if (bound_pcr_index != kNotBoundToPCR) { |
| policy_session = trunks->factory->GetPolicySession(); |
| result = policy_session->StartUnboundSession(true, false); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error starting policy session: " << GetErrorString(result); |
| return false; |
| } |
| result = policy_session->PolicyPCR( |
| std::map<uint32_t, std::string>({{bound_pcr_index, ""}})); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error creating PCR policy: " << GetErrorString(result); |
| return false; |
| } |
| delegate = policy_session->GetDelegate(); |
| } else { |
| hmac_session = trunks->factory->GetHmacSession(); |
| result = hmac_session->StartUnboundSession(true, true); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error starting hmac session: " << GetErrorString(result); |
| return false; |
| } |
| hmac_session->SetEntityAuthorizationValue(""); |
| delegate = hmac_session->GetDelegate(); |
| } |
| |
| ScopedKeyHandle handle; |
| TpmRetryAction retry = LoadWrappedKey(key_blob, &handle); |
| if (retry != kTpmRetryNone) { |
| LOG(ERROR) << "Error loading pcr bound key."; |
| return false; |
| } |
| std::string tpm_signature; |
| result = trunks->tpm_utility->Sign( |
| handle.value(), trunks::TPM_ALG_RSASSA, trunks::TPM_ALG_SHA256, |
| input.to_string(), true /* generate_hash */, delegate, &tpm_signature); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error signing: " << GetErrorString(result); |
| return false; |
| } |
| signature->assign(tpm_signature.begin(), tpm_signature.end()); |
| return true; |
| } |
| |
| bool Tpm2Impl::CreatePCRBoundKey(const std::map<uint32_t, std::string>& pcr_map, |
| AsymmetricKeyUsage key_type, |
| SecureBlob* key_blob, |
| SecureBlob* public_key_der, |
| SecureBlob* creation_blob) { |
| CHECK(key_blob) << "No key blob argument provided."; |
| CHECK(creation_blob) << "No creation blob argument provided."; |
| TrunksClientContext* trunks; |
| if (!GetTrunksContext(&trunks)) { |
| return false; |
| } |
| std::string policy_digest; |
| TPM_RC result = trunks->tpm_utility->GetPolicyDigestForPcrValues( |
| pcr_map, false /* use_auth_value */, &policy_digest); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error getting policy digest: " << GetErrorString(result); |
| return false; |
| } |
| std::vector<uint32_t> pcr_list; |
| for (const auto& map_pair : pcr_map) { |
| pcr_list.push_back(map_pair.first); |
| } |
| std::string tpm_key_blob; |
| std::string tpm_creation_blob; |
| std::unique_ptr<trunks::AuthorizationDelegate> delegate = |
| trunks->factory->GetPasswordAuthorization(""); |
| result = trunks->tpm_utility->CreateRSAKeyPair( |
| key_type, kDefaultTpmRsaModulusSize, |
| kDefaultTpmPublicExponent, "", // No authorization |
| policy_digest, |
| true, // use_only_policy_authorization |
| pcr_list, delegate.get(), &tpm_key_blob, |
| &tpm_creation_blob /* No creation_blob */); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error creating a pcr bound key: " << GetErrorString(result); |
| return false; |
| } |
| key_blob->assign(tpm_key_blob.begin(), tpm_key_blob.end()); |
| creation_blob->assign(tpm_creation_blob.begin(), tpm_creation_blob.end()); |
| |
| // if |public_key_der| is present, create and assign it. |
| if (public_key_der) { |
| trunks::TPM2B_PUBLIC public_data; |
| trunks::TPM2B_PRIVATE private_data; |
| if (!trunks->factory->GetBlobParser()->ParseKeyBlob( |
| key_blob->to_string(), &public_data, &private_data)) { |
| return false; |
| } |
| if (!PublicAreaToPublicKeyDER(public_data.public_area, public_key_der)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| bool Tpm2Impl::VerifyPCRBoundKey(const std::map<uint32_t, std::string>& pcr_map, |
| const SecureBlob& key_blob, |
| const SecureBlob& creation_blob) { |
| TrunksClientContext* trunks; |
| if (!GetTrunksContext(&trunks)) { |
| return false; |
| } |
| // First we verify that the PCR were in a known good state at the time of |
| // Key creation. |
| trunks::TPM2B_CREATION_DATA creation_data; |
| trunks::TPM2B_DIGEST creation_hash; |
| trunks::TPMT_TK_CREATION creation_ticket; |
| if (!trunks->factory->GetBlobParser()->ParseCreationBlob( |
| creation_blob.to_string(), &creation_data, &creation_hash, |
| &creation_ticket)) { |
| LOG(ERROR) << "Error parsing creation_blob."; |
| return false; |
| } |
| trunks::TPML_PCR_SELECTION& pcr_select = |
| creation_data.creation_data.pcr_select; |
| if (pcr_select.count != 1) { |
| LOG(ERROR) << "Creation data missing creation PCR value."; |
| return false; |
| } |
| if (pcr_select.pcr_selections[0].hash != trunks::TPM_ALG_SHA256) { |
| LOG(ERROR) << "Creation PCR extended with wrong hash algorithm."; |
| return false; |
| } |
| uint8_t* pcr_selections = pcr_select.pcr_selections[0].pcr_select; |
| if (pcr_map.size() != CountSetBits(pcr_selections, PCR_SELECT_MIN)) { |
| LOG(ERROR) << "Incorrect creation PCR specified."; |
| return false; |
| } |
| std::string concatenated_pcr_values; |
| for (const auto& map_pair : pcr_map) { |
| uint32_t pcr_index = map_pair.first; |
| const std::string pcr_value = map_pair.second; |
| if (pcr_index >= 8 * PCR_SELECT_MIN || |
| (pcr_selections[pcr_index / 8] & (1 << (pcr_index % 8))) == 0) { |
| LOG(ERROR) << "Incorrect creation PCR specified."; |
| return false; |
| } |
| concatenated_pcr_values += pcr_value; |
| } |
| Blob expected_pcr_digest = |
| CryptoLib::Sha256(BlobFromString(concatenated_pcr_values)); |
| if (creation_data.creation_data.pcr_digest.size != |
| expected_pcr_digest.size()) { |
| LOG(ERROR) << "Incorrect PCR digest size."; |
| return false; |
| } |
| if (memcmp(creation_data.creation_data.pcr_digest.buffer, |
| expected_pcr_digest.data(), expected_pcr_digest.size()) != 0) { |
| LOG(ERROR) << "Incorrect PCR digest value."; |
| return false; |
| } |
| // Then we certify that the key was created by the TPM. |
| ScopedKeyHandle scoped_handle; |
| if (LoadWrappedKey(key_blob, &scoped_handle) != Tpm::kTpmRetryNone) { |
| return false; |
| } |
| TPM_RC result = trunks->tpm_utility->CertifyCreation( |
| scoped_handle.value(), creation_blob.to_string()); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error certifying that key was created by TPM: " |
| << trunks::GetErrorString(result); |
| return false; |
| } |
| // Finally we verify that the key's policy_digest is the expected value. |
| std::unique_ptr<trunks::PolicySession> trial_session = |
| trunks->factory->GetTrialSession(); |
| result = trial_session->StartUnboundSession(true, true); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error starting a trial session: " << GetErrorString(result); |
| return false; |
| } |
| result = trial_session->PolicyPCR(pcr_map); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error restricting trial policy to pcr value: " |
| << GetErrorString(result); |
| return false; |
| } |
| std::string policy_digest; |
| result = trial_session->GetDigest(&policy_digest); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error getting policy digest: " << GetErrorString(result); |
| return false; |
| } |
| trunks::TPMT_PUBLIC public_area; |
| result = trunks->tpm_utility->GetKeyPublicArea(scoped_handle.value(), |
| &public_area); |
| if (result != TPM_RC_SUCCESS) { |
| return false; |
| } |
| if (public_area.auth_policy.size != policy_digest.size()) { |
| LOG(ERROR) << "Key auth policy and policy digest are of different length." |
| << public_area.auth_policy.size << "," << policy_digest.size(); |
| return false; |
| } else if (memcmp(public_area.auth_policy.buffer, policy_digest.data(), |
| policy_digest.size()) != 0) { |
| LOG(ERROR) << "Key auth policy is different from policy digest."; |
| return false; |
| } else if (public_area.object_attributes & trunks::kUserWithAuth) { |
| LOG(ERROR) << "Key authorization is not restricted to policy."; |
| return false; |
| } |
| return true; |
| } |
| |
| bool Tpm2Impl::ExtendPCR(uint32_t pcr_index, const Blob& extension) { |
| TrunksClientContext* trunks; |
| if (!GetTrunksContext(&trunks)) { |
| return false; |
| } |
| std::unique_ptr<trunks::AuthorizationDelegate> delegate = |
| trunks->factory->GetPasswordAuthorization(""); |
| TPM_RC result = trunks->tpm_utility->ExtendPCR( |
| pcr_index, BlobToString(extension), delegate.get()); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error extending PCR: " << GetErrorString(result); |
| return false; |
| } |
| return true; |
| } |
| |
| bool Tpm2Impl::ReadPCR(uint32_t pcr_index, Blob* pcr_value) { |
| CHECK(pcr_value); |
| TrunksClientContext* trunks; |
| if (!GetTrunksContext(&trunks)) { |
| return false; |
| } |
| std::string pcr_digest; |
| TPM_RC result = trunks->tpm_utility->ReadPCR(pcr_index, &pcr_digest); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error reading from PCR: " << GetErrorString(result); |
| return false; |
| } |
| *pcr_value = BlobFromString(pcr_digest); |
| return true; |
| } |
| |
| bool Tpm2Impl::WrapRsaKey(const SecureBlob& public_modulus, |
| const SecureBlob& prime_factor, |
| SecureBlob* wrapped_key) { |
| TrunksClientContext* trunks; |
| if (!GetTrunksContext(&trunks)) { |
| return false; |
| } |
| std::string key_blob; |
| std::unique_ptr<trunks::AuthorizationDelegate> delegate = |
| trunks->factory->GetPasswordAuthorization(""); |
| TPM_RC result = trunks->tpm_utility->ImportRSAKey( |
| trunks::TpmUtility::kDecryptKey, public_modulus.to_string(), |
| kDefaultTpmPublicExponent, prime_factor.to_string(), |
| "", // No authorization, |
| delegate.get(), &key_blob); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error creating SRK wrapped key: " << GetErrorString(result); |
| return false; |
| } |
| wrapped_key->assign(key_blob.begin(), key_blob.end()); |
| return true; |
| } |
| |
| Tpm::TpmRetryAction Tpm2Impl::LoadWrappedKey(const SecureBlob& wrapped_key, |
| ScopedKeyHandle* key_handle) { |
| CHECK(key_handle); |
| TrunksClientContext* trunks; |
| if (!GetTrunksContext(&trunks)) { |
| return Tpm::kTpmRetryFailNoRetry; |
| } |
| trunks::TPM_HANDLE handle; |
| std::unique_ptr<trunks::AuthorizationDelegate> delegate = |
| trunks->factory->GetPasswordAuthorization(""); |
| TPM_RC result = trunks->tpm_utility->LoadKey(wrapped_key.to_string(), |
| delegate.get(), &handle); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error loading SRK wrapped key: " << GetErrorString(result); |
| return ResultToRetryAction(result); |
| } |
| key_handle->reset(this, handle); |
| return Tpm::kTpmRetryNone; |
| } |
| |
| bool Tpm2Impl::LegacyLoadCryptohomeKey(ScopedKeyHandle* key_handle, |
| SecureBlob* key_blob) { |
| // This doesn't apply to devices with TPM 2.0. |
| return false; |
| } |
| |
| void Tpm2Impl::CloseHandle(TpmKeyHandle key_handle) { |
| TrunksClientContext* trunks; |
| if (!GetTrunksContext(&trunks)) { |
| return; |
| } |
| TPM_RC result = |
| trunks->factory->GetTpm()->FlushContextSync(key_handle, nullptr); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(WARNING) << "Error flushing tpm handle " << key_handle << ": " |
| << GetErrorString(result); |
| } |
| } |
| |
| Tpm::TpmRetryAction Tpm2Impl::EncryptBlob(TpmKeyHandle key_handle, |
| const SecureBlob& plaintext, |
| const SecureBlob& key, |
| SecureBlob* ciphertext) { |
| CHECK(ciphertext); |
| TrunksClientContext* trunks; |
| if (!GetTrunksContext(&trunks)) { |
| return Tpm::kTpmRetryFailNoRetry; |
| } |
| std::string tpm_ciphertext; |
| TPM_RC result = trunks->tpm_utility->AsymmetricEncrypt( |
| key_handle, trunks::TPM_ALG_OAEP, trunks::TPM_ALG_SHA256, |
| plaintext.to_string(), nullptr, &tpm_ciphertext); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error encrypting plaintext: " << GetErrorString(result); |
| return ResultToRetryAction(result); |
| } |
| if (!CryptoLib::ObscureRSAMessage(SecureBlob(tpm_ciphertext), key, |
| ciphertext)) { |
| LOG(ERROR) << "Error obscuring tpm encrypted blob."; |
| return Tpm::kTpmRetryFailNoRetry; |
| } |
| return Tpm::kTpmRetryNone; |
| } |
| |
| Tpm::TpmRetryAction Tpm2Impl::DecryptBlob( |
| TpmKeyHandle key_handle, |
| const SecureBlob& ciphertext, |
| const SecureBlob& key, |
| const std::map<uint32_t, std::string>& pcr_map, |
| SecureBlob* plaintext) { |
| CHECK(plaintext); |
| TrunksClientContext* trunks; |
| if (!GetTrunksContext(&trunks)) { |
| return Tpm::kTpmRetryFailNoRetry; |
| } |
| SecureBlob local_data; |
| if (!CryptoLib::UnobscureRSAMessage(ciphertext, key, &local_data)) { |
| LOG(ERROR) << "Error unobscureing message."; |
| return Tpm::kTpmRetryFailNoRetry; |
| } |
| trunks::AuthorizationDelegate* delegate; |
| std::unique_ptr<trunks::PolicySession> policy_session; |
| std::unique_ptr<trunks::AuthorizationDelegate> default_delegate; |
| if (!pcr_map.empty()) { |
| policy_session = trunks->factory->GetPolicySession(); |
| TPM_RC result = policy_session->StartUnboundSession(true, true); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error starting policy session: " << GetErrorString(result); |
| return Tpm::kTpmRetryFailNoRetry; |
| } |
| result = policy_session->PolicyPCR(pcr_map); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error creating PCR policy: " << GetErrorString(result); |
| return Tpm::kTpmRetryFailNoRetry; |
| } |
| delegate = policy_session->GetDelegate(); |
| } else { |
| default_delegate = trunks->factory->GetPasswordAuthorization(""); |
| delegate = default_delegate.get(); |
| } |
| |
| std::string tpm_plaintext; |
| TPM_RC result = trunks->tpm_utility->AsymmetricDecrypt( |
| key_handle, trunks::TPM_ALG_OAEP, trunks::TPM_ALG_SHA256, |
| local_data.to_string(), delegate, &tpm_plaintext); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error decrypting plaintext: " << GetErrorString(result); |
| return ResultToRetryAction(result); |
| } |
| plaintext->assign(tpm_plaintext.begin(), tpm_plaintext.end()); |
| return Tpm::kTpmRetryNone; |
| } |
| |
| Tpm::TpmRetryAction Tpm2Impl::SealToPcrWithAuthorization( |
| TpmKeyHandle key_handle, |
| const SecureBlob& plaintext, |
| const SecureBlob& auth_blob, |
| const std::map<uint32_t, std::string>& pcr_map, |
| SecureBlob* sealed_data) { |
| // Get the auth_value. |
| std::string auth_value; |
| if (!GetAuthValue(key_handle, auth_blob, &auth_value)) { |
| return Tpm::kTpmRetryFailNoRetry; |
| } |
| |
| TrunksClientContext* trunks; |
| if (!GetTrunksContext(&trunks)) { |
| return Tpm::kTpmRetryFailNoRetry; |
| } |
| |
| // Get the policy digest for PCR. |
| std::string policy_digest; |
| TPM_RC result = trunks->tpm_utility->GetPolicyDigestForPcrValues( |
| pcr_map, true /* use_auth_value */, &policy_digest); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error getting policy digest: " << GetErrorString(result); |
| return ResultToRetryAction(result); |
| } |
| |
| std::unique_ptr<trunks::HmacSession> session = |
| trunks->factory->GetHmacSession(); |
| result = session->StartUnboundSession(true, true); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error starting hmac session: " << GetErrorString(result); |
| return ResultToRetryAction(result); |
| } |
| |
| std::string sealed_str; |
| result = trunks->tpm_utility->SealData(plaintext.to_string(), policy_digest, |
| auth_value, session->GetDelegate(), |
| &sealed_str); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error sealing data to PCR with authorization: " |
| << GetErrorString(result); |
| return ResultToRetryAction(result); |
| } |
| sealed_data->assign(sealed_str.begin(), sealed_str.end()); |
| |
| return Tpm::kTpmRetryNone; |
| } |
| |
| Tpm::TpmRetryAction Tpm2Impl::UnsealWithAuthorization( |
| TpmKeyHandle key_handle, |
| const SecureBlob& sealed_data, |
| const SecureBlob& auth_blob, |
| const std::map<uint32_t, std::string>& pcr_map, |
| SecureBlob* plaintext) { |
| std::string auth_value; |
| if (!GetAuthValue(key_handle, auth_blob, &auth_value)) { |
| return Tpm::kTpmRetryFailNoRetry; |
| } |
| |
| TrunksClientContext* trunks; |
| if (!GetTrunksContext(&trunks)) { |
| return Tpm::kTpmRetryFailNoRetry; |
| } |
| |
| std::unique_ptr<trunks::PolicySession> policy_session = |
| trunks->factory->GetPolicySession(); |
| // Use unsalted session here, to unseal faster. |
| TPM_RC result = policy_session->StartUnboundSession(false, false); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error starting policy session: " << GetErrorString(result); |
| return ResultToRetryAction(result); |
| } |
| result = policy_session->PolicyAuthValue(); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << __func__ << ": Error setting session to use auth_value: " |
| << GetErrorString(result); |
| return ResultToRetryAction(result); |
| } |
| result = policy_session->PolicyPCR(pcr_map); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error in PolicyPCR: " |
| << GetErrorString(result); |
| return ResultToRetryAction(result); |
| } |
| policy_session->SetEntityAuthorizationValue(auth_value); |
| std::string unsealed_data; |
| result = trunks->tpm_utility->UnsealData(sealed_data.to_string(), |
| policy_session->GetDelegate(), |
| &unsealed_data); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error unsealing data with authorization: " |
| << GetErrorString(result); |
| return ResultToRetryAction(result); |
| } |
| plaintext->assign(unsealed_data.begin(), unsealed_data.end()); |
| |
| return Tpm::kTpmRetryNone; |
| } |
| |
| Tpm::TpmRetryAction Tpm2Impl::GetPublicKeyHash(TpmKeyHandle key_handle, |
| SecureBlob* hash) { |
| CHECK(hash); |
| TrunksClientContext* trunks; |
| if (!GetTrunksContext(&trunks)) { |
| return Tpm::kTpmRetryFailNoRetry; |
| } |
| trunks::TPMT_PUBLIC public_data; |
| TPM_RC result = |
| trunks->tpm_utility->GetKeyPublicArea(key_handle, &public_data); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error getting key public area: " << GetErrorString(result); |
| return ResultToRetryAction(result); |
| } |
| std::string public_modulus = |
| trunks::StringFrom_TPM2B_PUBLIC_KEY_RSA(public_data.unique.rsa); |
| *hash = CryptoLib::Sha256(SecureBlob(public_modulus)); |
| return Tpm::kTpmRetryNone; |
| } |
| |
| void Tpm2Impl::GetStatus(TpmKeyHandle key, TpmStatusInfo* status) { |
| memset(status, 0, sizeof(TpmStatusInfo)); |
| TrunksClientContext* trunks; |
| if (!GetTrunksContext(&trunks)) { |
| return; |
| } |
| status->this_instance_has_context = true; |
| status->this_instance_has_key_handle = (key != 0); |
| status->last_tpm_error = trunks->tpm_state->Initialize(); |
| if (status->last_tpm_error != TPM_RC_SUCCESS) { |
| return; |
| } |
| status->can_connect = true; |
| trunks::TPMT_PUBLIC public_srk; |
| status->last_tpm_error = trunks->tpm_utility->GetKeyPublicArea( |
| trunks::kStorageRootKey, &public_srk); |
| if (status->last_tpm_error != TPM_RC_SUCCESS) { |
| return; |
| } |
| status->can_load_srk = true; |
| status->can_load_srk_public_key = true; |
| status->srk_vulnerable_roca = false; |
| |
| // Check the Cryptohome key by using what we have been told. |
| status->has_cryptohome_key = (key != 0); |
| |
| if (status->has_cryptohome_key) { |
| // Check encryption (we don't care about the contents, just whether or not |
| // there was an error) |
| SecureBlob data(16); |
| SecureBlob password(16); |
| SecureBlob salt(8); |
| SecureBlob data_out(16); |
| memset(data.data(), 'A', data.size()); |
| memset(password.data(), 'B', password.size()); |
| memset(salt.data(), 'C', salt.size()); |
| memset(data_out.data(), 'D', data_out.size()); |
| SecureBlob aes_key; |
| CryptoLib::PasskeyToAesKey(password, salt, 13, &aes_key, NULL); |
| if (EncryptBlob(key, data, aes_key, &data_out) != kTpmRetryNone) { |
| return; |
| } |
| status->can_encrypt = true; |
| |
| // Check decryption (we don't care about the contents, just whether or not |
| // there was an error) |
| if (DecryptBlob(key, data_out, aes_key, std::map<uint32_t, std::string>(), |
| &data) != kTpmRetryNone) { |
| return; |
| } |
| status->can_decrypt = true; |
| } |
| } |
| |
| base::Optional<bool> Tpm2Impl::IsSrkRocaVulnerable() { |
| // This doesn't apply to devices with TPM 2.0. |
| return false; |
| } |
| |
| bool Tpm2Impl::GetDictionaryAttackInfo(int* counter, |
| int* threshold, |
| bool* lockout, |
| int* seconds_remaining) { |
| if (!InitializeTpmManagerClients()) { |
| return false; |
| } |
| |
| tpm_manager::GetDictionaryAttackInfoReply da_info; |
| auto method = base::Bind( |
| &tpm_manager::TpmOwnershipInterface::GetDictionaryAttackInfo, |
| base::Unretained(tpm_owner_), |
| tpm_manager::GetDictionaryAttackInfoRequest()); |
| SendTpmManagerRequestAndWait(method, &da_info); |
| |
| if (da_info.status() != tpm_manager::STATUS_SUCCESS) { |
| LOG(ERROR) << __func__ << ": failed to get DA info from tpm_managerd."; |
| return false; |
| } |
| |
| *counter = da_info.dictionary_attack_counter(); |
| *threshold = da_info.dictionary_attack_threshold(); |
| *lockout = da_info.dictionary_attack_lockout_in_effect(); |
| *seconds_remaining = |
| da_info.dictionary_attack_lockout_seconds_remaining(); |
| |
| return true; |
| } |
| |
| bool Tpm2Impl::ResetDictionaryAttackMitigation( |
| const Blob& /* delegate_blob */, |
| const Blob& /* delegate_secret */) { |
| if (!InitializeTpmManagerClients()) { |
| return false; |
| } |
| |
| auto method = base::Bind( |
| &tpm_manager::TpmOwnershipInterface::ResetDictionaryAttackLock, |
| base::Unretained(tpm_owner_), |
| tpm_manager::ResetDictionaryAttackLockRequest()); |
| |
| auto callback = base::Bind( |
| [](const tpm_manager::ResetDictionaryAttackLockReply& reply) { |
| if (reply.status() == tpm_manager::STATUS_SUCCESS) { |
| LOG(INFO) << "Successfully reset DA lock."; |
| } else { |
| LOG(ERROR) << "Failed to reset DA lock from tpm_managerd."; |
| } |
| }); |
| |
| if (!SendTpmManagerRequest(method, callback)) { |
| LOG(ERROR) << __func__ << "Failed to post a new task to reset DA lock."; |
| } |
| |
| return true; |
| } |
| |
| void Tpm2Impl::DeclareTpmFirmwareStable() { |
| TrunksClientContext* trunks; |
| if (!fw_declared_stable_ && GetTrunksContext(&trunks)) { |
| TPM_RC res = trunks->tpm_utility->DeclareTpmFirmwareStable(); |
| fw_declared_stable_ = (res == TPM_RC_SUCCESS); |
| } |
| } |
| |
| bool Tpm2Impl::GetTrunksContext(TrunksClientContext** trunks) { |
| if (has_external_trunks_context_) { |
| *trunks = &external_trunks_context_; |
| return true; |
| } |
| base::PlatformThreadId thread_id = base::PlatformThread::CurrentId(); |
| if (trunks_contexts_.count(thread_id) == 0) { |
| std::unique_ptr<TrunksClientContext> new_context(new TrunksClientContext); |
| new_context->factory_impl = std::make_unique<trunks::TrunksFactoryImpl>(); |
| if (!new_context->factory_impl->Initialize()) { |
| LOG(ERROR) << "Failed to initialize trunks factory."; |
| return false; |
| } |
| new_context->factory = new_context->factory_impl.get(); |
| new_context->tpm_state = new_context->factory->GetTpmState(); |
| new_context->tpm_utility = new_context->factory->GetTpmUtility(); |
| trunks_contexts_[thread_id] = std::move(new_context); |
| } |
| *trunks = trunks_contexts_[thread_id].get(); |
| return true; |
| } |
| |
| bool Tpm2Impl::LoadPublicKeyFromSpki( |
| const Blob& public_key_spki_der, |
| AsymmetricKeyUsage key_type, |
| trunks::TPM_ALG_ID scheme, |
| trunks::TPM_ALG_ID hash_alg, |
| trunks::AuthorizationDelegate* session_delegate, |
| ScopedKeyHandle* key_handle) { |
| // Parse the SPKI. |
| const unsigned char* asn1_ptr = public_key_spki_der.data(); |
| const crypto::ScopedEVP_PKEY pkey( |
| d2i_PUBKEY(nullptr, &asn1_ptr, public_key_spki_der.size())); |
| if (!pkey) { |
| LOG(ERROR) << "Error parsing Subject Public Key Info DER"; |
| return false; |
| } |
| const crypto::ScopedRSA rsa(EVP_PKEY_get1_RSA(pkey.get())); |
| if (!rsa) { |
| LOG(ERROR) << "Error: non-RSA key was supplied"; |
| return false; |
| } |
| SecureBlob key_modulus(RSA_size(rsa.get())); |
| const BIGNUM* n; |
| const BIGNUM* e; |
| RSA_get0_key(rsa.get(), &n, &e, nullptr); |
| if (BN_bn2bin(n, key_modulus.data()) != key_modulus.size()) { |
| LOG(ERROR) << "Error extracting public key modulus"; |
| return false; |
| } |
| constexpr BN_ULONG kInvalidBnWord = ~static_cast<BN_ULONG>(0); |
| const BN_ULONG exponent_word = BN_get_word(e); |
| if (exponent_word == kInvalidBnWord || |
| !base::IsValueInRangeForNumericType<uint32_t>(exponent_word)) { |
| LOG(ERROR) << "Error extracting public key exponent"; |
| return false; |
| } |
| const uint32_t key_exponent = static_cast<uint32_t>(exponent_word); |
| // Load the key into the TPM. |
| TrunksClientContext* trunks; |
| if (!GetTrunksContext(&trunks)) |
| return false; |
| trunks::TPM_HANDLE key_handle_raw = 0; |
| TPM_RC tpm_result = trunks->tpm_utility->LoadRSAPublicKey( |
| key_type, scheme, hash_alg, key_modulus.to_string(), key_exponent, |
| session_delegate, &key_handle_raw); |
| if (tpm_result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error loading public key: " << GetErrorString(tpm_result); |
| return false; |
| } |
| key_handle->reset(this, key_handle_raw); |
| return true; |
| } |
| |
| void Tpm2Impl::HandleOwnershipTakenEvent() { |
| is_owned_ = true; |
| has_checked_owned_ = true; |
| } |
| |
| bool Tpm2Impl::PublicAreaToPublicKeyDER(const trunks::TPMT_PUBLIC& public_area, |
| brillo::SecureBlob* public_key_der) { |
| crypto::ScopedRSA rsa(RSA_new()); |
| crypto::ScopedBIGNUM e(BN_new()), n(BN_new()); |
| if (!rsa || !e || !n) { |
| LOG(ERROR) << "Failed to allocate RSA or BIGNUM for public key."; |
| return false; |
| } |
| if (!BN_set_word(e.get(), kDefaultTpmPublicExponent) || |
| !BN_bin2bn(public_area.unique.rsa.buffer, |
| public_area.unique.rsa.size, n.get()) || |
| !RSA_set0_key(rsa.get(), n.release(), e.release(), nullptr)) { |
| LOG(ERROR) << "Failed to set up RSA."; |
| return false; |
| } |
| int der_length = i2d_RSAPublicKey(rsa.get(), nullptr); |
| if (der_length < 0) { |
| LOG(ERROR) << "Failed to get DER-encoded public key length."; |
| return false; |
| } |
| public_key_der->resize(der_length); |
| unsigned char* der_buffer = public_key_der->data(); |
| der_length = i2d_RSAPublicKey(rsa.get(), &der_buffer); |
| if (der_length < 0) { |
| LOG(ERROR) << "Failed to DER-encode public key."; |
| return false; |
| } |
| return true; |
| } |
| |
| void Tpm2Impl::InitializeClientsOnTpmManagerThread( |
| base::WaitableEvent* completion) { |
| CHECK(completion); |
| CHECK(tpm_manager_thread_.task_runner()->RunsTasksInCurrentSequence()); |
| |
| default_tpm_owner_ = std::make_unique<tpm_manager::TpmOwnershipDBusProxy>(); |
| default_tpm_nvram_ = std::make_unique<tpm_manager::TpmNvramDBusProxy>(); |
| if (default_tpm_owner_->Initialize()) { |
| tpm_owner_ = default_tpm_owner_.get(); |
| } |
| if (default_tpm_nvram_->Initialize()) { |
| tpm_nvram_ = default_tpm_nvram_.get(); |
| } |
| completion->Signal(); |
| } |
| |
| bool Tpm2Impl::InitializeTpmManagerClients() { |
| if (!tpm_manager_thread_.IsRunning() && |
| !tpm_manager_thread_.StartWithOptions(base::Thread::Options( |
| base::MessageLoopForIO::TYPE_IO, 0 /* Default stack size. */))) { |
| LOG(ERROR) << "Failed to start tpm_manager thread."; |
| return false; |
| } |
| if (!tpm_owner_ || !tpm_nvram_) { |
| base::WaitableEvent event(base::WaitableEvent::ResetPolicy::MANUAL, |
| base::WaitableEvent::InitialState::NOT_SIGNALED); |
| tpm_manager_thread_.task_runner()->PostTask( |
| FROM_HERE, base::Bind(&Tpm2Impl::InitializeClientsOnTpmManagerThread, |
| base::Unretained(this), &event)); |
| event.Wait(); |
| } |
| if (!tpm_owner_ || !tpm_nvram_) { |
| LOG(ERROR) << "Failed to initialize tpm_managerd clients."; |
| return false; |
| } |
| return true; |
| } |
| |
| bool Tpm2Impl::GetAuthValue(TpmKeyHandle key_handle, |
| const SecureBlob& pass_blob, |
| std::string* auth_value) { |
| if (pass_blob.size() != kDefaultTpmRsaModulusSize / 8) { |
| return false; |
| } |
| |
| TrunksClientContext* trunks; |
| if (!GetTrunksContext(&trunks)) { |
| return false; |
| } |
| |
| // To guarantee that pass_blob is lower that public key modulus, just set the |
| // first byte to 0. |
| std::string value_to_decrypt = pass_blob.to_string(); |
| value_to_decrypt[0] = 0; |
| std::string decrypted_value; |
| std::unique_ptr<trunks::AuthorizationDelegate> delegate = |
| trunks->factory->GetPasswordAuthorization(""); |
| TPM_RC result = result = trunks->tpm_utility->AsymmetricDecrypt( |
| key_handle, trunks::TPM_ALG_NULL, trunks::TPM_ALG_NULL, |
| value_to_decrypt, delegate.get(), &decrypted_value); |
| if (result != TPM_RC_SUCCESS) { |
| LOG(ERROR) << "Error decrypting pass_blob: " << GetErrorString(result); |
| return false; |
| } |
| *auth_value = CryptoLib::Sha256(SecureBlob(decrypted_value)).to_string(); |
| |
| return true; |
| } |
| |
| template <typename ReplyProtoType, typename MethodType> |
| bool Tpm2Impl::SendTpmManagerRequest( |
| const MethodType& method, |
| const base::Callback<void(const ReplyProtoType&)>& callback) { |
| return tpm_manager_thread_.task_runner()->PostTask( |
| FROM_HERE, base::Bind(method, callback)); |
| } |
| |
| template <typename ReplyProtoType, typename MethodType> |
| void Tpm2Impl::SendTpmManagerRequestAndWait(const MethodType& method, |
| ReplyProtoType* reply_proto) { |
| base::WaitableEvent event(base::WaitableEvent::ResetPolicy::MANUAL, |
| base::WaitableEvent::InitialState::NOT_SIGNALED); |
| auto callback = base::Bind( |
| [](ReplyProtoType* target, base::WaitableEvent* completion, |
| const ReplyProtoType& reply) { |
| *target = reply; |
| completion->Signal(); |
| }, |
| reply_proto, &event); |
| tpm_manager_thread_.task_runner()->PostTask(FROM_HERE, |
| base::Bind(method, callback)); |
| event.Wait(); |
| } |
| |
| bool Tpm2Impl::UpdateTpmStatus(RefreshType refresh_type) { |
| if (!InitializeTpmManagerClients()) { |
| return false; |
| } |
| if (refresh_type != RefreshType::FORCE_REFRESH && |
| tpm_status_.status() == tpm_manager::STATUS_SUCCESS && |
| tpm_status_.enabled() && tpm_status_.owned()) { |
| // We have a valid status and we're not waiting on ownership so we don't |
| // need to refresh our cached status. |
| return true; |
| } |
| |
| tpm_manager::GetTpmStatusRequest request; |
| auto method = base::Bind(&tpm_manager::TpmOwnershipInterface::GetTpmStatus, |
| base::Unretained(tpm_owner_), |
| request); |
| SendTpmManagerRequestAndWait(method, &tpm_status_); |
| return (tpm_status_.status() == tpm_manager::STATUS_SUCCESS); |
| } |
| |
| bool Tpm2Impl::RemoveOwnerDependency( |
| TpmPersistentState::TpmOwnerDependency dependency) { |
| if (!InitializeTpmManagerClients()) { |
| return false; |
| } |
| tpm_manager::RemoveOwnerDependencyRequest request; |
| SetOwnerDependency(dependency, request.mutable_owner_dependency()); |
| if (request.owner_dependency().empty()) { |
| VLOG(1) << "Ignoring unused owner dependency " |
| << static_cast<int>(dependency); |
| return true; |
| } |
| auto method = |
| base::Bind(&tpm_manager::TpmOwnershipInterface::RemoveOwnerDependency, |
| base::Unretained(tpm_owner_), request); |
| tpm_manager::RemoveOwnerDependencyReply reply; |
| SendTpmManagerRequestAndWait(method, &reply); |
| return (reply.status() == tpm_manager::STATUS_SUCCESS); |
| } |
| |
| bool Tpm2Impl::ClearStoredPassword() { |
| if (!InitializeTpmManagerClients()) { |
| return false; |
| } |
| tpm_manager::ClearStoredOwnerPasswordRequest request; |
| auto method = |
| base::Bind(&tpm_manager::TpmOwnershipInterface::ClearStoredOwnerPassword, |
| base::Unretained(tpm_owner_), request); |
| tpm_manager::ClearStoredOwnerPasswordReply reply; |
| SendTpmManagerRequestAndWait(method, &reply); |
| if (reply.status() != tpm_manager::STATUS_SUCCESS) { |
| LOG(WARNING) << "Failed to clear stored owner password."; |
| return false; |
| } |
| tpm_status_.mutable_local_data()->clear_owner_password(); |
| return true; |
| } |
| |
| bool Tpm2Impl::GetVersionInfo(TpmVersionInfo* version_info) { |
| if (!version_info) { |
| LOG(ERROR) << "version_info is uninitialized."; |
| return false; |
| } |
| |
| if (version_info_) { |
| *version_info = *version_info_; |
| return true; |
| } |
| |
| // This is the first time we request for version info. |
| if (!InitializeTpmManagerClients()) { |
| return false; |
| } |
| |
| tpm_manager::GetVersionInfoRequest request; |
| tpm_manager::GetVersionInfoReply reply; |
| auto method = base::Bind( |
| &tpm_manager::TpmOwnershipInterface::GetVersionInfo, |
| base::Unretained(tpm_owner_), |
| request); |
| SendTpmManagerRequestAndWait(method, &reply); |
| |
| if (reply.status() != tpm_manager::STATUS_SUCCESS) { |
| LOG(ERROR) << "Failed to get version info from tpm_manager."; |
| return false; |
| } |
| |
| version_info_ = std::make_unique<TpmVersionInfo>(); |
| version_info_->family = reply.family(); |
| version_info_->spec_level = reply.spec_level(); |
| version_info_->manufacturer = reply.manufacturer(); |
| version_info_->tpm_model = reply.tpm_model(); |
| version_info_->firmware_version = reply.firmware_version(); |
| version_info_->vendor_specific = reply.vendor_specific(); |
| |
| *version_info = *version_info_; |
| return true; |
| } |
| |
| bool Tpm2Impl::GetIFXFieldUpgradeInfo(IFXFieldUpgradeInfo* info) { |
| return false; |
| } |
| |
| bool Tpm2Impl::SetUserType(Tpm::UserType type) { |
| VLOG(1) << __func__ << ": " << static_cast<int>(cur_user_type_) << " -> " |
| << static_cast<int>(type); |
| if (cur_user_type_ == UserType::NonOwner || cur_user_type_ == type) { |
| // It's not possible to transition from NonOwner to Owner, so don't even |
| // try. Also, if we are already in the desired state, no reason to |
| // repeat sending the command. |
| VLOG(1) << "ManageCCDPwd not needed"; |
| return true; |
| } |
| TrunksClientContext* trunks; |
| if (!GetTrunksContext(&trunks)) { |
| LOG(WARNING) << "Failed to obtain trunks context to set user type"; |
| cur_user_type_ = Tpm::UserType::Unknown; |
| return false; |
| } |
| TPM_RC res = |
| trunks->tpm_utility->ManageCCDPwd(type == UserType::Owner ? true : false); |
| if (res != TPM_RC_SUCCESS) { |
| cur_user_type_ = Tpm::UserType::Unknown; |
| if (res == kCr50ErrorNoSuchCommand) { |
| // In case we deal with Cr50 revision that doesn't support the command |
| // yet. We will still keep trying on each login. |
| LOG(WARNING) << "ManageCCDPwd is not supported"; |
| return true; |
| } else if (type == UserType::Owner) { |
| // If we fail to transition to Owner, that's fine. Worst thing that |
| // happens in this case: the owner user fails to set a CCD password until |
| // reboot. We only need to make sure that we don't let users sign in if |
| // setting NonOwner state fails. |
| LOG(WARNING) << "ManageCCDPwd(Owner) failed, ignoring: error=0x" |
| << std::hex << res; |
| return true; |
| } else { |
| LOG(ERROR) << "ManageCCDPwd(NonOwner) failed: error=0x" << std::hex |
| << res; |
| return false; |
| } |
| } |
| VLOG(1) << "ManageCCDPwd succeeded"; |
| cur_user_type_ = type; |
| return true; |
| } |
| |
| bool Tpm2Impl::GetRsuDeviceId(std::string* device_id) { |
| TrunksClientContext* trunks; |
| if (!GetTrunksContext(&trunks)) { |
| return false; |
| } |
| return trunks->tpm_utility->GetRsuDeviceId(device_id) == TPM_RC_SUCCESS; |
| } |
| |
| LECredentialBackend* Tpm2Impl::GetLECredentialBackend() { |
| #if USE_PINWEAVER |
| return &le_credential_backend_; |
| #else |
| return nullptr; |
| #endif |
| } |
| |
| SignatureSealingBackend* Tpm2Impl::GetSignatureSealingBackend() { |
| return &signature_sealing_backend_; |
| } |
| |
| bool Tpm2Impl::GetDelegate(brillo::Blob* /*blob*/, |
| brillo::Blob* /*secret*/, |
| bool* has_reset_lock_permissions) { |
| LOG(WARNING) << __func__ << ": No-ops to |blob| and |secret|."; |
| *has_reset_lock_permissions = true; |
| return true; |
| } |
| |
| bool Tpm2Impl::DoesUseTpmManager() { |
| return true; |
| } |
| |
| bool Tpm2Impl::IsCurrentPCR0ValueValid() { |
| return true; |
| } |
| |
| void Tpm2Impl::SetDelegateData(const std::string& delegate_blob, |
| bool has_reset_lock_permissions) { |
| } |
| |
| base::Optional<bool> Tpm2Impl::IsDelegateBoundToPcr() { |
| return false; |
| } |
| |
| bool Tpm2Impl::DelegateCanResetDACounter() { |
| return true; |
| } |
| |
| std::map<uint32_t, std::string> Tpm2Impl::GetPcrMap( |
| const std::string& obfuscated_username, bool use_extended_pcr) const { |
| std::map<uint32_t, std::string> pcr_map; |
| if (use_extended_pcr) { |
| brillo::SecureBlob starting_value(SHA256_DIGEST_LENGTH, 0); |
| brillo::SecureBlob digest_value = |
| CryptoLib::Sha256(brillo::SecureBlob::Combine( |
| starting_value, |
| CryptoLib::Sha256(brillo::SecureBlob(obfuscated_username)))); |
| pcr_map[kTpmSingleUserPCR] = digest_value.to_string(); |
| } else { |
| pcr_map[kTpmSingleUserPCR] = std::string(SHA256_DIGEST_LENGTH, 0); |
| } |
| |
| return pcr_map; |
| } |
| |
| } // namespace cryptohome |