123 lines
4.4 KiB
Plaintext
123 lines
4.4 KiB
Plaintext
// Copyright (c) 2011-2016 Ryan Prichard
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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#include "BackgroundDesktop.h"
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#include <memory>
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#include "DebugClient.h"
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#include "StringUtil.h"
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#include "WinptyException.h"
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namespace {
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static std::wstring getObjectName(HANDLE object) {
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BOOL success;
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DWORD lengthNeeded = 0;
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GetUserObjectInformationW(object, UOI_NAME,
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nullptr, 0,
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&lengthNeeded);
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ASSERT(lengthNeeded % sizeof(wchar_t) == 0);
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std::unique_ptr<wchar_t[]> tmp(
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new wchar_t[lengthNeeded / sizeof(wchar_t)]);
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success = GetUserObjectInformationW(object, UOI_NAME,
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tmp.get(), lengthNeeded,
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nullptr);
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if (!success) {
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throwWindowsError(L"GetUserObjectInformationW failed");
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}
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return std::wstring(tmp.get());
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}
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static std::wstring getDesktopName(HWINSTA winsta, HDESK desk) {
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return getObjectName(winsta) + L"\\" + getObjectName(desk);
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}
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} // anonymous namespace
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// Get a non-interactive window station for the agent.
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// TODO: review security w.r.t. windowstation and desktop.
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BackgroundDesktop::BackgroundDesktop() {
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try {
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m_originalStation = GetProcessWindowStation();
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if (m_originalStation == nullptr) {
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throwWindowsError(
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L"BackgroundDesktop ctor: "
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L"GetProcessWindowStation returned NULL");
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}
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m_newStation =
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CreateWindowStationW(nullptr, 0, WINSTA_ALL_ACCESS, nullptr);
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if (m_newStation == nullptr) {
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throwWindowsError(
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L"BackgroundDesktop ctor: CreateWindowStationW returned NULL");
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}
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if (!SetProcessWindowStation(m_newStation)) {
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throwWindowsError(
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L"BackgroundDesktop ctor: SetProcessWindowStation failed");
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}
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m_newDesktop = CreateDesktopW(
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L"Default", nullptr, nullptr, 0, GENERIC_ALL, nullptr);
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if (m_newDesktop == nullptr) {
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throwWindowsError(
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L"BackgroundDesktop ctor: CreateDesktopW failed");
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}
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m_newDesktopName = getDesktopName(m_newStation, m_newDesktop);
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TRACE("Created background desktop: %s",
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utf8FromWide(m_newDesktopName).c_str());
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} catch (...) {
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dispose();
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throw;
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}
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}
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void BackgroundDesktop::dispose() WINPTY_NOEXCEPT {
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if (m_originalStation != nullptr) {
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SetProcessWindowStation(m_originalStation);
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m_originalStation = nullptr;
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}
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if (m_newDesktop != nullptr) {
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CloseDesktop(m_newDesktop);
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m_newDesktop = nullptr;
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}
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if (m_newStation != nullptr) {
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CloseWindowStation(m_newStation);
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m_newStation = nullptr;
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}
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}
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std::wstring getCurrentDesktopName() {
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// MSDN says that the handles returned by GetProcessWindowStation and
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// GetThreadDesktop do not need to be passed to CloseWindowStation and
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// CloseDesktop, respectively.
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const HWINSTA winsta = GetProcessWindowStation();
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if (winsta == nullptr) {
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throwWindowsError(
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L"getCurrentDesktopName: "
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L"GetProcessWindowStation returned NULL");
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}
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const HDESK desk = GetThreadDesktop(GetCurrentThreadId());
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if (desk == nullptr) {
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throwWindowsError(
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L"getCurrentDesktopName: "
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L"GetThreadDesktop returned NULL");
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}
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return getDesktopName(winsta, desk);
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}
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