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PL286/system/tpm/trunks/resource_manager.cc

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//
// Copyright (C) 2015 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#include "trunks/resource_manager.h"
#include <algorithm>
#include <map>
#include <set>
#include <string>
#include <vector>
#include <base/callback.h>
#include "trunks/error_codes.h"
namespace {
const int kMaxCommandAttempts = 3;
const size_t kMinimumAuthorizationSize = 9;
const size_t kMessageHeaderSize = 10;
const trunks::TPM_HANDLE kMaxVirtualHandle =
(trunks::HR_TRANSIENT + trunks::HR_HANDLE_MASK);
class ScopedBool {
public:
ScopedBool() : target_(nullptr) {}
~ScopedBool() {
if (target_) {
*target_ = false;
}
}
void Enable(bool* target) {
target_ = target;
*target_ = true;
}
private:
bool* target_;
};
} // namespace
namespace trunks {
ResourceManager::ResourceManager(const TrunksFactory& factory,
CommandTransceiver* next_transceiver)
: factory_(factory), next_transceiver_(next_transceiver) {}
ResourceManager::~ResourceManager() {}
void ResourceManager::Initialize() {
// Abort if the TPM is not in a reasonable state and we can't get it into one.
std::unique_ptr<TpmUtility> tpm_utility = factory_.GetTpmUtility();
CHECK_EQ(tpm_utility->Startup(), TPM_RC_SUCCESS);
CHECK_EQ(tpm_utility->InitializeTpm(), TPM_RC_SUCCESS);
// Full control of the TPM is assumed and required. Existing transient object
// and session handles are mercilessly flushed.
for (UINT32 handle_type :
{HR_TRANSIENT, HR_HMAC_SESSION, HR_POLICY_SESSION}) {
TPMI_YES_NO more_data = YES;
TPMS_CAPABILITY_DATA data;
UINT32 handle_range = handle_type;
while (more_data) {
TPM_RC result = factory_.GetTpm()->GetCapabilitySync(
TPM_CAP_HANDLES, handle_range, MAX_CAP_HANDLES, &more_data, &data,
nullptr);
if (result != TPM_RC_SUCCESS) {
LOG(WARNING) << "Failed to query existing handles: "
<< GetErrorString(result);
break;
}
const TPML_HANDLE& handle_list = data.data.handles;
for (UINT32 i = 0; i < handle_list.count; ++i) {
factory_.GetTpm()->FlushContextSync(handle_list.handle[i], nullptr);
}
if (more_data) {
// Adjust the range to be greater than the most recent handle so on the
// next query we'll start where we left off.
handle_range = handle_list.handle[handle_list.count - 1];
}
}
}
}
void ResourceManager::SendCommand(const std::string& command,
const ResponseCallback& callback) {
callback.Run(SendCommandAndWait(command));
}
std::string ResourceManager::SendCommandAndWait(const std::string& command) {
// Sanitize the |command|. If this succeeds consistency of the command header
// and the size of all other sections can be assumed.
MessageInfo command_info;
TPM_RC result = ParseCommand(command, &command_info);
if (result != TPM_RC_SUCCESS) {
return CreateErrorResponse(result);
}
// A special case for FlushContext. It requires special handling because it
// has a handle as a parameter and because we need to cleanup if it succeeds.
if (command_info.code == TPM_CC_FlushContext) {
return ProcessFlushContext(command, command_info);
}
// Process all the input handles, e.g. map virtual handles.
std::vector<TPM_HANDLE> updated_handles;
for (auto handle : command_info.handles) {
TPM_HANDLE tpm_handle;
result = ProcessInputHandle(command_info, handle, &tpm_handle);
if (result != TPM_RC_SUCCESS) {
return CreateErrorResponse(result);
}
updated_handles.push_back(tpm_handle);
}
std::string updated_command = ReplaceHandles(command, updated_handles);
// Make sure all the required sessions are loaded.
for (auto handle : command_info.session_handles) {
result = EnsureSessionIsLoaded(command_info, handle);
if (result != TPM_RC_SUCCESS) {
return CreateErrorResponse(result);
}
}
// On a ContextLoad we may need to map virtualized context data.
if (command_info.code == TPM_CC_ContextLoad) {
std::string actual_load_data =
GetActualContextFromExternalContext(command_info.parameter_data);
// Check equality to see if replacement is necessary, and check size to see
// if the command looks like we expect (the idea is to avoid 'fixing'
// malformed commands). Note: updated_command.size() is guaranteed to be >=
// kMessageHeaderSize based on the sanitization in ParseCommand.
if (actual_load_data != command_info.parameter_data &&
actual_load_data.size() ==
updated_command.size() - kMessageHeaderSize) {
// Replace the parameter section of the command with |actual_load_data|.
VLOG(1) << "REPLACE_EXTERNAL_CONTEXT";
updated_command.replace(kMessageHeaderSize, std::string::npos,
actual_load_data);
}
}
// Send the |updated_command| to the next layer. Attempt to fix any actionable
// warnings for up to kMaxCommandAttempts.
std::string response;
MessageInfo response_info;
int attempts = 0;
while (attempts++ < kMaxCommandAttempts) {
response = next_transceiver_->SendCommandAndWait(updated_command);
result = ParseResponse(command_info, response, &response_info);
if (result != TPM_RC_SUCCESS) {
return CreateErrorResponse(result);
}
if (!FixWarnings(command_info, response_info.code)) {
// No actionable warnings were handled.
break;
}
}
if (response_info.code == TPM_RC_SUCCESS) {
if (response_info.session_continued.size() !=
command_info.session_handles.size()) {
LOG(WARNING) << "Session count mismatch!";
}
// Cleanup any sessions that were not continued.
for (size_t i = 0; i < command_info.session_handles.size(); ++i) {
if (i < response_info.session_continued.size() &&
!response_info.session_continued[i]) {
CleanupFlushedHandle(command_info.session_handles[i]);
}
}
// On a successful context save we need to cache the context data in case it
// needs to be virtualized later.
if (command_info.code == TPM_CC_ContextSave) {
ProcessExternalContextSave(command_info, response_info);
}
// Process all the output handles, which is loosely the inverse of the input
// handle processing. E.g. virtualize handles.
std::vector<TPM_HANDLE> virtual_handles;
for (auto handle : response_info.handles) {
virtual_handles.push_back(ProcessOutputHandle(handle));
}
response = ReplaceHandles(response, virtual_handles);
}
return response;
}
bool ResourceManager::ChooseSessionToEvict(
const std::vector<TPM_HANDLE>& sessions_to_retain,
TPM_HANDLE* session_to_evict) {
// Build a list of candidates by excluding |sessions_to_retain|.
std::vector<TPM_HANDLE> candidates;
for (auto& item : session_handles_) {
HandleInfo& info = item.second;
if (info.is_loaded &&
std::find(sessions_to_retain.begin(), sessions_to_retain.end(),
info.tpm_handle) == sessions_to_retain.end()) {
candidates.push_back(item.first);
}
}
if (candidates.empty()) {
LOG(WARNING) << "No sessions to evict.";
return false;
}
// Choose the candidate with the earliest |time_of_last_use|.
auto oldest_iter = std::min_element(
candidates.begin(), candidates.end(), [this](TPM_HANDLE a, TPM_HANDLE b) {
return (session_handles_[a].time_of_last_use <
session_handles_[b].time_of_last_use);
});
*session_to_evict = *oldest_iter;
return true;
}
void ResourceManager::CleanupFlushedHandle(TPM_HANDLE flushed_handle) {
if (IsObjectHandle(flushed_handle)) {
// For transient object handles, remove both the actual and virtual handles.
if (virtual_object_handles_.count(flushed_handle) > 0) {
tpm_object_handles_.erase(
virtual_object_handles_[flushed_handle].tpm_handle);
virtual_object_handles_.erase(flushed_handle);
}
} else if (IsSessionHandle(flushed_handle)) {
auto iter = session_handles_.find(flushed_handle);
if (iter == session_handles_.end()) {
return;
}
// For session handles, remove the handle and any associated context data.
HandleInfo& info = iter->second;
if (!info.is_loaded) {
std::string actual_context_data;
Serialize_TPMS_CONTEXT(info.context, &actual_context_data);
if (actual_context_to_external_.count(actual_context_data) > 0) {
external_context_to_actual_.erase(
actual_context_to_external_[actual_context_data]);
actual_context_to_external_.erase(actual_context_data);
}
}
session_handles_.erase(flushed_handle);
VLOG(1) << "CLEANUP_SESSION: " << std::hex << flushed_handle;
}
}
TPM_HANDLE ResourceManager::CreateVirtualHandle() {
TPM_HANDLE handle;
do {
handle = next_virtual_handle_;
if (next_virtual_handle_ == kMaxVirtualHandle) {
next_virtual_handle_ = TRANSIENT_FIRST;
} else {
++next_virtual_handle_;
}
} while (virtual_object_handles_.count(handle) > 0);
return handle;
}
TPM_RC ResourceManager::EnsureSessionIsLoaded(const MessageInfo& command_info,
TPM_HANDLE session_handle) {
// A password authorization can skip all this.
if (session_handle == TPM_RS_PW) {
return TPM_RC_SUCCESS;
}
auto handle_iter = session_handles_.find(session_handle);
if (handle_iter == session_handles_.end()) {
return MakeError(TPM_RC_HANDLE, FROM_HERE);
}
HandleInfo& handle_info = handle_iter->second;
if (!handle_info.is_loaded) {
TPM_RC result = LoadContext(command_info, &handle_info);
if (result != TPM_RC_SUCCESS) {
return result;
}
VLOG(1) << "RELOAD_SESSION: " << std::hex << session_handle;
}
handle_info.time_of_last_use = base::TimeTicks::Now();
return TPM_RC_SUCCESS;
}
void ResourceManager::EvictObjects(const MessageInfo& command_info) {
for (auto& item : virtual_object_handles_) {
HandleInfo& info = item.second;
if (!info.is_loaded ||
std::find(command_info.handles.begin(), command_info.handles.end(),
item.first) != command_info.handles.end()) {
continue;
}
TPM_RC result = SaveContext(command_info, &info);
if (result != TPM_RC_SUCCESS) {
LOG(WARNING) << "Failed to save transient object: "
<< GetErrorString(result);
continue;
}
result = factory_.GetTpm()->FlushContextSync(info.tpm_handle, nullptr);
if (result != TPM_RC_SUCCESS) {
LOG(WARNING) << "Failed to evict transient object: "
<< GetErrorString(result);
continue;
}
tpm_object_handles_.erase(info.tpm_handle);
VLOG(1) << "EVICT_OBJECT: " << std::hex << info.tpm_handle;
}
}
void ResourceManager::EvictSession(const MessageInfo& command_info) {
TPM_HANDLE session_to_evict;
if (!ChooseSessionToEvict(command_info.session_handles, &session_to_evict)) {
return;
}
HandleInfo& info = session_handles_[session_to_evict];
TPM_RC result = SaveContext(command_info, &info);
if (result != TPM_RC_SUCCESS) {
LOG(WARNING) << "Failed to evict session: " << GetErrorString(result);
}
VLOG(1) << "EVICT_SESSION: " << std::hex << session_to_evict;
}
std::vector<TPM_HANDLE> ResourceManager::ExtractHandlesFromBuffer(
size_t number_of_handles,
std::string* buffer) {
std::vector<TPM_HANDLE> handles(number_of_handles);
for (size_t i = 0; i < number_of_handles; ++i) {
TPM_HANDLE handle;
if (TPM_RC_SUCCESS == Parse_TPM_HANDLE(buffer, &handle, nullptr)) {
handles[i] = handle;
}
}
return handles;
}
void ResourceManager::FixContextGap(const MessageInfo& command_info) {
std::vector<TPM_HANDLE> sessions_to_ungap;
for (const auto& item : session_handles_) {
const HandleInfo& info = item.second;
if (!info.is_loaded) {
sessions_to_ungap.push_back(item.first);
}
}
// Sort by |time_of_create|.
std::sort(sessions_to_ungap.begin(), sessions_to_ungap.end(),
[this](TPM_HANDLE a, TPM_HANDLE b) {
return (session_handles_[a].time_of_create <
session_handles_[b].time_of_create);
});
for (auto handle : sessions_to_ungap) {
HandleInfo& info = session_handles_[handle];
// Loading and re-saving allows the TPM to assign a new context counter.
std::string old_context_blob;
Serialize_TPMS_CONTEXT(info.context, &old_context_blob);
TPM_RC result = LoadContext(command_info, &info);
if (result != TPM_RC_SUCCESS) {
LOG(WARNING) << "Failed to un-gap session (load): "
<< GetErrorString(result);
continue;
}
result = SaveContext(command_info, &info);
if (result != TPM_RC_SUCCESS) {
LOG(WARNING) << "Failed to un-gap session (save): "
<< GetErrorString(result);
continue;
}
// If this context is one that we're tracking for external use, update it.
auto iter = actual_context_to_external_.find(old_context_blob);
if (iter == actual_context_to_external_.end()) {
continue;
}
std::string new_context_blob;
Serialize_TPMS_CONTEXT(info.context, &new_context_blob);
const std::string& external_context_blob = iter->second;
actual_context_to_external_[new_context_blob] = external_context_blob;
external_context_to_actual_[external_context_blob] = new_context_blob;
actual_context_to_external_.erase(old_context_blob);
}
}
bool ResourceManager::FixWarnings(const MessageInfo& command_info,
TPM_RC result) {
if ((result & RC_WARN) == 0) {
return false;
}
// This method can be called anytime without tracking whether the current
// operation is already an attempt to fix a warning. All re-entrance issues
// are dealt with here using the following rule: Never attempt to fix the same
// warning twice.
ScopedBool scoped_bool;
if (!fixing_warnings_) {
scoped_bool.Enable(&fixing_warnings_);
warnings_already_seen_.clear();
} else if (warnings_already_seen_.count(result) > 0) {
return false;
}
warnings_already_seen_.insert(result);
switch (result) {
case TPM_RC_CONTEXT_GAP:
FixContextGap(command_info);
return true;
case TPM_RC_OBJECT_MEMORY:
case TPM_RC_OBJECT_HANDLES:
EvictObjects(command_info);
return true;
case TPM_RC_SESSION_MEMORY:
EvictSession(command_info);
return true;
case TPM_RC_MEMORY:
EvictObjects(command_info);
EvictSession(command_info);
return true;
case TPM_RC_SESSION_HANDLES:
FlushSession(command_info);
return true;
}
return false;
}
void ResourceManager::FlushSession(const MessageInfo& command_info) {
TPM_HANDLE session_to_flush;
LOG(WARNING) << "Resource manager needs to flush a session.";
if (!ChooseSessionToEvict(command_info.session_handles, &session_to_flush)) {
return;
}
TPM_RC result =
factory_.GetTpm()->FlushContextSync(session_to_flush, nullptr);
if (result != TPM_RC_SUCCESS) {
LOG(WARNING) << "Failed to flush session: " << GetErrorString(result);
return;
}
CleanupFlushedHandle(session_to_flush);
}
std::string ResourceManager::GetActualContextFromExternalContext(
const std::string& external_context) {
auto iter = external_context_to_actual_.find(external_context);
if (iter == external_context_to_actual_.end()) {
return external_context;
}
return iter->second;
}
bool ResourceManager::IsObjectHandle(TPM_HANDLE handle) const {
return ((handle & HR_RANGE_MASK) == HR_TRANSIENT);
}
bool ResourceManager::IsSessionHandle(TPM_HANDLE handle) const {
return ((handle & HR_RANGE_MASK) == HR_HMAC_SESSION ||
(handle & HR_RANGE_MASK) == HR_POLICY_SESSION);
}
TPM_RC ResourceManager::LoadContext(const MessageInfo& command_info,
HandleInfo* handle_info) {
CHECK(!handle_info->is_loaded);
TPM_RC result = TPM_RC_SUCCESS;
int attempts = 0;
while (attempts++ < kMaxCommandAttempts) {
result = factory_.GetTpm()->ContextLoadSync(
handle_info->context, &handle_info->tpm_handle, nullptr);
if (!FixWarnings(command_info, result)) {
break;
}
}
if (result != TPM_RC_SUCCESS) {
LOG(ERROR) << __func__
<< ": Failed to load context: " << GetErrorString(result);
return result;
}
handle_info->is_loaded = true;
return result;
}
TPM_RC ResourceManager::MakeError(TPM_RC tpm_error,
const ::tracked_objects::Location& location) {
LOG(ERROR) << "ResourceManager::" << location.function_name() << ":"
<< location.line_number() << ": " << GetErrorString(tpm_error);
return tpm_error + kResourceManagerTpmErrorBase;
}
TPM_RC ResourceManager::ParseCommand(const std::string& command,
MessageInfo* command_info) {
CHECK(command_info);
std::string buffer = command;
TPM_ST tag;
TPM_RC result = Parse_TPM_ST(&buffer, &tag, nullptr);
if (result != TPM_RC_SUCCESS) {
return MakeError(result, FROM_HERE);
}
if (tag != TPM_ST_SESSIONS && tag != TPM_ST_NO_SESSIONS) {
return MakeError(TPM_RC_TAG, FROM_HERE);
}
command_info->has_sessions = (tag == TPM_ST_SESSIONS);
UINT32 size = 0;
result = Parse_UINT32(&buffer, &size, nullptr);
if (result != TPM_RC_SUCCESS) {
return MakeError(result, FROM_HERE);
}
if (size != command.size()) {
return MakeError(TPM_RC_SIZE, FROM_HERE);
}
result = Parse_TPM_CC(&buffer, &command_info->code, nullptr);
if (result != TPM_RC_SUCCESS) {
return MakeError(result, FROM_HERE);
}
if (command_info->code < TPM_CC_FIRST || command_info->code > TPM_CC_LAST) {
return MakeError(TPM_RC_COMMAND_CODE, FROM_HERE);
}
size_t number_of_handles = GetNumberOfRequestHandles(command_info->code);
command_info->handles = ExtractHandlesFromBuffer(number_of_handles, &buffer);
if (number_of_handles != command_info->handles.size()) {
return MakeError(TPM_RC_SIZE, FROM_HERE);
}
if (command_info->has_sessions) {
// Sessions exist, so we're expecting a valid authorization size value.
UINT32 authorization_size = 0;
result = Parse_UINT32(&buffer, &authorization_size, nullptr);
if (result != TPM_RC_SUCCESS) {
return MakeError(result, FROM_HERE);
}
if (buffer.size() < authorization_size ||
authorization_size < kMinimumAuthorizationSize) {
return MakeError(TPM_RC_SIZE, FROM_HERE);
}
// Move out the parameter bytes, leaving only the authorization section.
command_info->parameter_data = buffer.substr(authorization_size);
buffer.erase(authorization_size);
// Parse as many authorization sessions as there are in the section.
while (!buffer.empty()) {
TPM_HANDLE handle;
result = Parse_TPM_HANDLE(&buffer, &handle, nullptr);
if (result != TPM_RC_SUCCESS) {
return MakeError(result, FROM_HERE);
}
if (handle != TPM_RS_PW && session_handles_.count(handle) == 0) {
return MakeError(TPM_RC_HANDLE, FROM_HERE);
}
TPM2B_NONCE nonce;
result = Parse_TPM2B_NONCE(&buffer, &nonce, nullptr);
if (result != TPM_RC_SUCCESS) {
return MakeError(result, FROM_HERE);
}
BYTE attributes;
result = Parse_BYTE(&buffer, &attributes, nullptr);
if (result != TPM_RC_SUCCESS) {
return MakeError(result, FROM_HERE);
}
TPM2B_DIGEST authorization;
result = Parse_TPM2B_DIGEST(&buffer, &authorization, nullptr);
if (result != TPM_RC_SUCCESS) {
return MakeError(result, FROM_HERE);
}
command_info->session_handles.push_back(handle);
command_info->session_continued.push_back((attributes & 1) == 1);
}
} else {
// No sessions, so all remaining data is parameter data.
command_info->parameter_data = buffer;
}
return TPM_RC_SUCCESS;
}
TPM_RC ResourceManager::ParseResponse(const MessageInfo& command_info,
const std::string& response,
MessageInfo* response_info) {
CHECK(response_info);
std::string buffer = response;
TPM_ST tag;
TPM_RC result = Parse_TPM_ST(&buffer, &tag, nullptr);
if (result != TPM_RC_SUCCESS) {
return MakeError(result, FROM_HERE);
}
if (tag != TPM_ST_SESSIONS && tag != TPM_ST_NO_SESSIONS) {
return MakeError(TPM_RC_TAG, FROM_HERE);
}
response_info->has_sessions = (tag == TPM_ST_SESSIONS);
UINT32 size = 0;
result = Parse_UINT32(&buffer, &size, nullptr);
if (result != TPM_RC_SUCCESS) {
return MakeError(result, FROM_HERE);
}
if (size != response.size()) {
return MakeError(TPM_RC_SIZE, FROM_HERE);
}
result = Parse_TPM_RC(&buffer, &response_info->code, nullptr);
if (result != TPM_RC_SUCCESS) {
return MakeError(result, FROM_HERE);
}
size_t number_of_handles = GetNumberOfResponseHandles(command_info.code);
response_info->handles = ExtractHandlesFromBuffer(number_of_handles, &buffer);
if (number_of_handles != response_info->handles.size()) {
return MakeError(TPM_RC_SIZE, FROM_HERE);
}
if (response_info->has_sessions) {
// Sessions exist, so we're expecting a valid parameter size value.
UINT32 parameter_size = 0;
result = Parse_UINT32(&buffer, &parameter_size, nullptr);
if (result != TPM_RC_SUCCESS) {
return MakeError(result, FROM_HERE);
}
if (buffer.size() < parameter_size) {
return MakeError(TPM_RC_SIZE, FROM_HERE);
}
// Move out the parameter bytes, leaving only the authorization section.
response_info->parameter_data = buffer.substr(0, parameter_size);
buffer.erase(0, parameter_size);
// Parse as many authorization sessions as there are in the section.
while (!buffer.empty()) {
TPM2B_NONCE nonce;
result = Parse_TPM2B_NONCE(&buffer, &nonce, nullptr);
if (result != TPM_RC_SUCCESS) {
return MakeError(result, FROM_HERE);
}
BYTE attributes;
result = Parse_BYTE(&buffer, &attributes, nullptr);
if (result != TPM_RC_SUCCESS) {
return MakeError(result, FROM_HERE);
}
TPM2B_DIGEST acknowledgement;
result = Parse_TPM2B_DIGEST(&buffer, &acknowledgement, nullptr);
if (result != TPM_RC_SUCCESS) {
return MakeError(result, FROM_HERE);
}
response_info->session_continued.push_back((attributes & 1) == 1);
}
} else {
// No sessions, so all remaining data is parameter data.
response_info->parameter_data = buffer;
}
return TPM_RC_SUCCESS;
}
void ResourceManager::ProcessExternalContextSave(
const MessageInfo& command_info,
const MessageInfo& response_info) {
CHECK_EQ(command_info.code, TPM_CC_ContextSave);
if (command_info.handles.size() != 1) {
LOG(WARNING) << "Invalid context save command.";
return;
}
// We know command_info.handles[0] is valid because this is validated when the
// command is parsed.
TPM_HANDLE saved_handle = command_info.handles[0];
// Only track external context data for session handles.
if (!IsSessionHandle(saved_handle)) {
return;
}
std::string mutable_parameter = response_info.parameter_data;
TPMS_CONTEXT context;
std::string context_blob;
TPM_RC result =
Parse_TPMS_CONTEXT(&mutable_parameter, &context, &context_blob);
if (result != TPM_RC_SUCCESS) {
LOG(WARNING) << "Invalid context save response: " << GetErrorString(result);
return;
}
auto iter = session_handles_.find(saved_handle);
if (iter != session_handles_.end()) {
iter->second.is_loaded = false;
iter->second.context = context;
} else {
// Unknown handle? Not anymore.
LOG(WARNING) << "Context for unknown handle.";
HandleInfo new_handle_info;
new_handle_info.Init(saved_handle);
new_handle_info.is_loaded = false;
new_handle_info.context = context;
session_handles_[saved_handle] = new_handle_info;
}
// Use the original context data as the 'external' context data. If this gets
// virtualized, only the 'actual' context data will change.
external_context_to_actual_[context_blob] = context_blob;
actual_context_to_external_[context_blob] = context_blob;
}
std::string ResourceManager::ProcessFlushContext(
const std::string& command,
const MessageInfo& command_info) {
std::string buffer = command_info.parameter_data;
// There must be exactly one handle in the parameters section.
std::vector<TPM_HANDLE> handles = ExtractHandlesFromBuffer(1, &buffer);
if (handles.size() != 1) {
return CreateErrorResponse(MakeError(TPM_RC_SIZE, FROM_HERE));
}
TPM_HANDLE handle = handles[0];
TPM_HANDLE actual_handle = handle;
if (IsObjectHandle(handle)) {
auto iter = virtual_object_handles_.find(handle);
if (iter == virtual_object_handles_.end()) {
return CreateErrorResponse(MakeError(TPM_RC_HANDLE, FROM_HERE));
}
if (!iter->second.is_loaded) {
// The handle wasn't loaded so no need to bother the TPM.
CleanupFlushedHandle(handle);
return CreateErrorResponse(TPM_RC_SUCCESS);
}
actual_handle = iter->second.tpm_handle;
}
// Send a command with the original header but with |actual_handle| as the
// parameter.
std::string handle_blob;
Serialize_TPM_HANDLE(actual_handle, &handle_blob);
std::string updated_command =
command.substr(0, kMessageHeaderSize) + handle_blob;
// No need to loop and fix warnings, there are no actionable warnings on when
// flushing context.
std::string response = next_transceiver_->SendCommandAndWait(updated_command);
MessageInfo response_info;
TPM_RC result = ParseResponse(command_info, response, &response_info);
if (result != TPM_RC_SUCCESS) {
return CreateErrorResponse(result);
}
// Cleanup the handle locally even if the TPM did not recognize it.
if (response_info.code == TPM_RC_SUCCESS ||
response_info.code == TPM_RC_HANDLE) {
CleanupFlushedHandle(handle);
}
return response;
}
TPM_RC ResourceManager::ProcessInputHandle(const MessageInfo& command_info,
TPM_HANDLE virtual_handle,
TPM_HANDLE* actual_handle) {
// Only transient object handles are virtualized.
if (!IsObjectHandle(virtual_handle)) {
*actual_handle = virtual_handle;
return TPM_RC_SUCCESS;
}
auto handle_iter = virtual_object_handles_.find(virtual_handle);
if (handle_iter == virtual_object_handles_.end()) {
return MakeError(TPM_RC_HANDLE, FROM_HERE);
}
HandleInfo& handle_info = handle_iter->second;
if (!handle_info.is_loaded) {
TPM_RC result = LoadContext(command_info, &handle_info);
if (result != TPM_RC_SUCCESS) {
return result;
}
tpm_object_handles_[handle_info.tpm_handle] = virtual_handle;
VLOG(1) << "RELOAD_OBJECT: " << std::hex << virtual_handle;
}
VLOG(1) << "INPUT_HANDLE_REPLACE: " << std::hex << virtual_handle << " -> "
<< std::hex << handle_info.tpm_handle;
*actual_handle = handle_info.tpm_handle;
return TPM_RC_SUCCESS;
}
TPM_HANDLE ResourceManager::ProcessOutputHandle(TPM_HANDLE handle) {
// Track, but do not virtualize, session handles.
if (IsSessionHandle(handle)) {
auto session_handle_iter = session_handles_.find(handle);
if (session_handle_iter == session_handles_.end()) {
HandleInfo new_handle_info;
new_handle_info.Init(handle);
session_handles_[handle] = new_handle_info;
VLOG(1) << "OUTPUT_HANDLE_NEW_SESSION: " << std::hex << handle;
}
return handle;
}
// Only transient object handles are virtualized.
if (!IsObjectHandle(handle)) {
return handle;
}
auto virtual_handle_iter = tpm_object_handles_.find(handle);
if (virtual_handle_iter == tpm_object_handles_.end()) {
TPM_HANDLE new_virtual_handle = CreateVirtualHandle();
HandleInfo new_handle_info;
new_handle_info.Init(handle);
virtual_object_handles_[new_virtual_handle] = new_handle_info;
tpm_object_handles_[handle] = new_virtual_handle;
VLOG(1) << "OUTPUT_HANDLE_NEW_VIRTUAL: " << std::hex << handle << " -> "
<< std::hex << new_virtual_handle;
return new_virtual_handle;
}
VLOG(1) << "OUTPUT_HANDLE_REPLACE: " << std::hex << handle << " -> "
<< std::hex << virtual_handle_iter->second;
return virtual_handle_iter->second;
}
std::string ResourceManager::ReplaceHandles(
const std::string& message,
const std::vector<TPM_HANDLE>& new_handles) {
std::string handles_blob;
for (auto handle : new_handles) {
CHECK_EQ(Serialize_TPM_HANDLE(handle, &handles_blob), TPM_RC_SUCCESS);
}
std::string mutable_message = message;
CHECK_GE(message.size(), kMessageHeaderSize + handles_blob.size());
return mutable_message.replace(kMessageHeaderSize, handles_blob.size(),
handles_blob);
}
TPM_RC ResourceManager::SaveContext(const MessageInfo& command_info,
HandleInfo* handle_info) {
CHECK(handle_info->is_loaded);
TPM_RC result = TPM_RC_SUCCESS;
int attempts = 0;
while (attempts++ < kMaxCommandAttempts) {
std::string tpm_handle_name;
Serialize_TPM_HANDLE(handle_info->tpm_handle, &tpm_handle_name);
result = factory_.GetTpm()->ContextSaveSync(handle_info->tpm_handle,
tpm_handle_name,
&handle_info->context, nullptr);
if (!FixWarnings(command_info, result)) {
break;
}
}
if (result != TPM_RC_SUCCESS) {
LOG(ERROR) << __func__
<< ": Failed to load context: " << GetErrorString(result);
return result;
}
handle_info->is_loaded = false;
return result;
}
ResourceManager::HandleInfo::HandleInfo() : is_loaded(false), tpm_handle(0) {
memset(&context, 0, sizeof(TPMS_CONTEXT));
}
void ResourceManager::HandleInfo::Init(TPM_HANDLE handle) {
tpm_handle = handle;
is_loaded = true;
time_of_create = base::TimeTicks::Now();
time_of_last_use = base::TimeTicks::Now();
}
} // namespace trunks