Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 178 insertions, 0 deletions

diff --git a/widget/windows/ShellHeaderOnlyUtils.h b/widget/windows/ShellHeaderOnlyUtils.h
new file mode 100644
index 0000000000..11849c99cc
--- /dev/null
+++ b/widget/windows/ShellHeaderOnlyUtils.h
@@ -0,0 +1,178 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_ShellHeaderOnlyUtils_h
+#define mozilla_ShellHeaderOnlyUtils_h
+
+#include "mozilla/WinHeaderOnlyUtils.h"
+
+#include <objbase.h>
+
+#include <exdisp.h>
+#include <shldisp.h>
+#include <shlobj.h>
+#include <shlwapi.h>
+#include <shobjidl.h>
+#include <shtypes.h>
+// NB: include this after shldisp.h so its macros do not conflict with COM
+// interfaces defined by shldisp.h
+#include <shellapi.h>
+#include <type_traits>
+
+#include <comdef.h>
+#include <comutil.h>
+
+#include "mozilla/RefPtr.h"
+#include "mozilla/UniquePtr.h"
+
+namespace mozilla {
+
+/**
+ * Ask the current user's Desktop to ShellExecute on our behalf, thus causing
+ * the resulting launched process to inherit its security priviliges from
+ * Explorer instead of our process.
+ *
+ * This is useful in two scenarios, in particular:
+ *   * We are running as an elevated user and we want to start something as the
+ *     "normal" user;
+ *   * We are starting a process that is incompatible with our process's
+ *     process mitigation policies. By delegating to Explorer, the child process
+ *     will not be affected by our process mitigations.
+ *
+ * Since this communication happens over DCOM, Explorer's COM DACL governs
+ * whether or not we can execute against it, thus avoiding privilege escalation.
+ */
+inline LauncherVoidResult ShellExecuteByExplorer(const _bstr_t& aPath,
+                                                 const _variant_t& aArgs,
+                                                 const _variant_t& aVerb,
+                                                 const _variant_t& aWorkingDir,
+                                                 const _variant_t& aShowCmd) {
+  // NB: Explorer may be a local server, not an inproc server
+  RefPtr<IShellWindows> shellWindows;
+  HRESULT hr = ::CoCreateInstance(
+      CLSID_ShellWindows, nullptr, CLSCTX_INPROC_SERVER | CLSCTX_LOCAL_SERVER,
+      IID_IShellWindows, getter_AddRefs(shellWindows));
+  if (FAILED(hr)) {
+    return LAUNCHER_ERROR_FROM_HRESULT(hr);
+  }
+
+  // 1. Find the shell view for the desktop.
+  _variant_t loc(int(CSIDL_DESKTOP));
+  _variant_t empty;
+  long hwnd;
+  RefPtr<IDispatch> dispDesktop;
+  hr = shellWindows->FindWindowSW(&loc, &empty, SWC_DESKTOP, &hwnd,
+                                  SWFO_NEEDDISPATCH,
+                                  getter_AddRefs(dispDesktop));
+  if (FAILED(hr)) {
+    return LAUNCHER_ERROR_FROM_HRESULT(hr);
+  }
+
+  if (hr == S_FALSE) {
+    // The call succeeded but the window was not found.
+    return LAUNCHER_ERROR_FROM_WIN32(ERROR_NOT_FOUND);
+  }
+
+  RefPtr<IServiceProvider> servProv;
+  hr = dispDesktop->QueryInterface(IID_IServiceProvider,
+                                   getter_AddRefs(servProv));
+  if (FAILED(hr)) {
+    return LAUNCHER_ERROR_FROM_HRESULT(hr);
+  }
+
+  RefPtr<IShellBrowser> browser;
+  hr = servProv->QueryService(SID_STopLevelBrowser, IID_IShellBrowser,
+                              getter_AddRefs(browser));
+  if (FAILED(hr)) {
+    return LAUNCHER_ERROR_FROM_HRESULT(hr);
+  }
+
+  RefPtr<IShellView> activeShellView;
+  hr = browser->QueryActiveShellView(getter_AddRefs(activeShellView));
+  if (FAILED(hr)) {
+    return LAUNCHER_ERROR_FROM_HRESULT(hr);
+  }
+
+  // 2. Get the automation object for the desktop.
+  RefPtr<IDispatch> dispView;
+  hr = activeShellView->GetItemObject(SVGIO_BACKGROUND, IID_IDispatch,
+                                      getter_AddRefs(dispView));
+  if (FAILED(hr)) {
+    return LAUNCHER_ERROR_FROM_HRESULT(hr);
+  }
+
+  RefPtr<IShellFolderViewDual> folderView;
+  hr = dispView->QueryInterface(IID_IShellFolderViewDual,
+                                getter_AddRefs(folderView));
+  if (FAILED(hr)) {
+    return LAUNCHER_ERROR_FROM_HRESULT(hr);
+  }
+
+  // 3. Get the interface to IShellDispatch2
+  RefPtr<IDispatch> dispShell;
+  hr = folderView->get_Application(getter_AddRefs(dispShell));
+  if (FAILED(hr)) {
+    return LAUNCHER_ERROR_FROM_HRESULT(hr);
+  }
+
+  RefPtr<IShellDispatch2> shellDisp;
+  hr =
+      dispShell->QueryInterface(IID_IShellDispatch2, getter_AddRefs(shellDisp));
+  if (FAILED(hr)) {
+    return LAUNCHER_ERROR_FROM_HRESULT(hr);
+  }
+
+  // Passing the foreground privilege so that the shell can launch an
+  // application in the foreground.  This fails with E_ACCESSDENIED if the
+  // current window is shown in the background.  We keep a soft assert for
+  // the other failures to investigate how it happened.
+  hr = ::CoAllowSetForegroundWindow(shellDisp, nullptr);
+  MOZ_ASSERT(SUCCEEDED(hr) || hr == E_ACCESSDENIED);
+
+  // shellapi.h macros interfere with the correct naming of the method being
+  // called on IShellDispatch2. Temporarily remove that definition.
+#if defined(ShellExecute)
+#  define MOZ_REDEFINE_SHELLEXECUTE
+#  undef ShellExecute
+#endif  // defined(ShellExecute)
+
+  // 4. Now call IShellDispatch2::ShellExecute to ask Explorer to execute.
+  hr = shellDisp->ShellExecute(aPath, aArgs, aWorkingDir, aVerb, aShowCmd);
+  if (FAILED(hr)) {
+    return LAUNCHER_ERROR_FROM_HRESULT(hr);
+  }
+
+  // Restore the macro that was removed prior to IShellDispatch2::ShellExecute
+#if defined(MOZ_REDEFINE_SHELLEXECUTE)
+#  if defined(UNICODE)
+#    define ShellExecute ShellExecuteW
+#  else
+#    define ShellExecute ShellExecuteA
+#  endif
+#  undef MOZ_REDEFINE_SHELLEXECUTE
+#endif  // defined(MOZ_REDEFINE_SHELLEXECUTE)
+
+  return Ok();
+}
+
+using UniqueAbsolutePidl =
+    UniquePtr<std::remove_pointer_t<PIDLIST_ABSOLUTE>, CoTaskMemFreeDeleter>;
+
+inline LauncherResult<UniqueAbsolutePidl> ShellParseDisplayName(
+    const wchar_t* aPath) {
+  PIDLIST_ABSOLUTE rawAbsPidl = nullptr;
+  SFGAOF sfgao;
+  HRESULT hr = ::SHParseDisplayName(aPath, nullptr, &rawAbsPidl, 0, &sfgao);
+  if (FAILED(hr)) {
+    return LAUNCHER_ERROR_FROM_HRESULT(hr);
+  }
+
+  return UniqueAbsolutePidl(rawAbsPidl);
+}
+
+}  // namespace mozilla
+
+#endif  // mozilla_ShellHeaderOnlyUtils_h