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// Copyright (c) 2011 The Chromium 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 "sandbox/src/handle_table.h"
#include <algorithm>
#include <cstdlib>
#include "base/memory/scoped_ptr.h"
#include "sandbox/src/win_utils.h"
namespace {
bool CompareHandleEntries(const SYSTEM_HANDLE_INFORMATION& a,
const SYSTEM_HANDLE_INFORMATION& b) {
return a.ProcessId < b.ProcessId;
}
} // namespace
namespace sandbox {
const char16* HandleTable::kTypeProcess = L"Process";
const char16* HandleTable::kTypeThread = L"Thread";
const char16* HandleTable::kTypeFile = L"File";
const char16* HandleTable::kTypeDirectory = L"Directory";
const char16* HandleTable::kTypeKey = L"Key";
const char16* HandleTable::kTypeWindowStation = L"WindowStation";
const char16* HandleTable::kTypeDesktop = L"Desktop";
const char16* HandleTable::kTypeService = L"Service";
const char16* HandleTable::kTypeMutex = L"Mutex";
const char16* HandleTable::kTypeSemaphore = L"Semaphore";
const char16* HandleTable::kTypeEvent = L"Event";
const char16* HandleTable::kTypeTimer = L"Timer";
const char16* HandleTable::kTypeNamedPipe = L"NamedPipe";
const char16* HandleTable::kTypeJobObject = L"JobObject";
const char16* HandleTable::kTypeFileMap = L"FileMap";
const char16* HandleTable::kTypeAlpcPort = L"ALPC Port";
HandleTable::HandleTable() {
static NtQuerySystemInformation QuerySystemInformation = NULL;
if (!QuerySystemInformation)
ResolveNTFunctionPtr("NtQuerySystemInformation", &QuerySystemInformation);
ULONG size = 0x15000;
NTSTATUS result;
do {
handle_info_buffer_.resize(size);
result = QuerySystemInformation(SystemHandleInformation,
handle_info_internal(), size, &size);
} while (result == STATUS_INFO_LENGTH_MISMATCH);
// We failed, so make an empty table.
if (!NT_SUCCESS(result)) {
handle_info_buffer_.resize(0);
return;
}
// Sort it to make process lookups faster.
std::sort(handle_info_internal()->Information,
handle_info_internal()->Information +
handle_info_internal()->NumberOfHandles, CompareHandleEntries);
}
HandleTable::Iterator HandleTable::HandlesForProcess(ULONG process_id) const {
SYSTEM_HANDLE_INFORMATION key;
key.ProcessId = process_id;
const SYSTEM_HANDLE_INFORMATION* start = handle_info()->Information;
const SYSTEM_HANDLE_INFORMATION* finish =
&handle_info()->Information[handle_info()->NumberOfHandles];
start = std::lower_bound(start, finish, key, CompareHandleEntries);
if (start->ProcessId != process_id)
return Iterator(*this, finish, finish);
finish = std::upper_bound(start, finish, key, CompareHandleEntries);
return Iterator(*this, start, finish);
}
HandleTable::HandleEntry::HandleEntry(
const SYSTEM_HANDLE_INFORMATION* handle_info_entry)
: handle_entry_(handle_info_entry), last_entry_(0) {
}
void HandleTable::HandleEntry::UpdateInfo(UpdateType flag) {
static NtQueryObject QueryObject = NULL;
if (!QueryObject)
ResolveNTFunctionPtr("NtQueryObject", &QueryObject);
NTSTATUS result;
// Always update the basic type info, but grab the names as needed.
if (needs_info_update()) {
handle_name_.clear();
type_name_.clear();
last_entry_ = handle_entry_;
// Most handle names are very short, so start small and reuse this buffer.
if (type_info_buffer_.empty())
type_info_buffer_.resize(sizeof(OBJECT_TYPE_INFORMATION)
+ (32 * sizeof(wchar_t)));
ULONG size = static_cast<ULONG>(type_info_buffer_.size());
result = QueryObject(reinterpret_cast<HANDLE>(handle_entry_->Handle),
ObjectTypeInformation, type_info_internal(), size, &size);
while (result == STATUS_INFO_LENGTH_MISMATCH) {
type_info_buffer_.resize(size);
result = QueryObject(reinterpret_cast<HANDLE>(handle_entry_->Handle),
ObjectTypeInformation, type_info_internal(), size, &size);
}
if (!NT_SUCCESS(result)) {
type_info_buffer_.clear();
return;
}
}
// Don't bother copying out names until we ask for them, and then cache them.
switch (flag) {
case UPDATE_INFO_AND_NAME:
if (type_info_buffer_.size() && handle_name_.empty()) {
ULONG size = MAX_PATH;
scoped_ptr<UNICODE_STRING> name;
do {
name.reset(reinterpret_cast<UNICODE_STRING*>(new BYTE[size]));
result = QueryObject(reinterpret_cast<HANDLE>(
handle_entry_->Handle), ObjectNameInformation, name.get(),
size, &size);
} while (result == STATUS_INFO_LENGTH_MISMATCH);
if (NT_SUCCESS(result)) {
handle_name_.assign(name->Buffer, name->Length / sizeof(wchar_t));
}
}
break;
case UPDATE_INFO_AND_TYPE_NAME:
if (!type_info_buffer_.empty() && type_info_internal()->Name.Buffer &&
type_name_.empty()) {
type_name_.assign(type_info_internal()->Name.Buffer,
type_info_internal()->Name.Length / sizeof(wchar_t));
}
break;
}
}
const OBJECT_TYPE_INFORMATION* HandleTable::HandleEntry::TypeInfo() {
UpdateInfo(UPDATE_INFO_ONLY);
return type_info_buffer_.empty() ? NULL : type_info_internal();
}
const string16& HandleTable::HandleEntry::Name() {
UpdateInfo(UPDATE_INFO_AND_NAME);
return handle_name_;
}
const string16& HandleTable::HandleEntry::Type() {
UpdateInfo(UPDATE_INFO_AND_TYPE_NAME);
return type_name_;
}
bool HandleTable::HandleEntry::IsType(const string16& type_string) {
UpdateInfo(UPDATE_INFO_ONLY);
if (type_info_buffer_.empty())
return false;
return type_string.compare(0,
type_info_internal()->Name.Length / sizeof(wchar_t),
type_info_internal()->Name.Buffer) == 0;
}
HandleTable::Iterator::Iterator(const HandleTable& table,
const SYSTEM_HANDLE_INFORMATION* start,
const SYSTEM_HANDLE_INFORMATION* end)
: table_(table), current_(start), end_(end) {
}
HandleTable::Iterator::Iterator(const Iterator& it)
: table_(it.table_), current_(it.current_.handle_entry_), end_(it.end_) {
}
} // namespace sandbox
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