Adding upstream version 124.0.1.upstream/124.0.1

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

1 files changed, 212 insertions, 0 deletions

diff --git a/other-licenses/nsis/Contrib/ExecInExplorer/ExecInExplorer.cpp b/other-licenses/nsis/Contrib/ExecInExplorer/ExecInExplorer.cpp
new file mode 100644
index 0000000000..05e0ed5e92
--- /dev/null
+++ b/other-licenses/nsis/Contrib/ExecInExplorer/ExecInExplorer.cpp
@@ -0,0 +1,212 @@
+/* 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 http://mozilla.org/MPL/2.0/. */
+
+// This file is an NSIS plugin which exports a function that starts a process
+// from a provided path by using the shell automation API to have explorer.exe
+// invoke ShellExecute. This roundabout method of starting a process is useful
+// because it means the new process will use the integrity level and security
+// token of the shell, so it allows starting an unelevated process from inside
+// an elevated one. The method is based on
+// https://blogs.msdn.microsoft.com/oldnewthing/20131118-00/?p=2643
+// but the code has been rewritten to remove the need for ATL or the C runtime.
+
+// Normally an NSIS installer would use the UAC plugin, which itself uses both
+// an unelevated and an elevated process, and the elevated process can invoke
+// functions in the unelevated one, so this plugin wouldn't be needed.
+// But uninstallers are often directly run elevated because that's just how
+// the Windows UI launches them, so there is no unelevated process. This
+// plugin allows starting a needed unelevated process in that situation.
+
+#include <windows.h>
+#include <shlobj.h>
+
+#pragma comment(lib, "shlwapi.lib")
+
+static IShellView*
+GetDesktopWindowShellView()
+{
+  IShellView* view = nullptr;
+  IShellWindows* shell = nullptr;
+  CoCreateInstance(CLSID_ShellWindows, NULL, CLSCTX_LOCAL_SERVER,
+                   IID_PPV_ARGS(&shell));
+  if (shell) {
+    VARIANT empty;
+    VariantInit(&empty);
+
+    VARIANT loc;
+    loc.vt = VT_VARIANT | VT_BYREF;
+    PIDLIST_ABSOLUTE locList;
+    SHGetFolderLocation(nullptr, CSIDL_DESKTOP, nullptr, 0, &locList);
+    loc.byref = locList;
+
+    HWND windowHandle = 0;
+    IDispatch* dispatch = nullptr;
+
+    shell->FindWindowSW(&loc, &empty, SWC_DESKTOP, (long*)&windowHandle,
+                        SWFO_NEEDDISPATCH, &dispatch);
+    if (dispatch) {
+      IServiceProvider* provider = nullptr;
+      dispatch->QueryInterface(IID_PPV_ARGS(&provider));
+      if (provider) {
+        IShellBrowser* browser = nullptr;
+        provider->QueryService(SID_STopLevelBrowser, IID_PPV_ARGS(&browser));
+        if (browser) {
+          browser->QueryActiveShellView(&view);
+          browser->Release();
+        }
+        provider->Release();
+      }
+      dispatch->Release();
+    }
+    shell->Release();
+  }
+
+  return view;
+}
+
+static IShellDispatch2*
+GetApplicationFromShellView(IShellView* view)
+{
+  IShellDispatch2* shellDispatch = nullptr;
+  IDispatch* viewDisp = nullptr;
+  HRESULT hr = view->GetItemObject(SVGIO_BACKGROUND, IID_PPV_ARGS(&viewDisp));
+  if (SUCCEEDED(hr)) {
+    IShellFolderViewDual* shellViewFolder = nullptr;
+    viewDisp->QueryInterface(IID_PPV_ARGS(&shellViewFolder));
+    if (shellViewFolder) {
+      IDispatch* dispatch = nullptr;
+      shellViewFolder->get_Application(&dispatch);
+      if (dispatch) {
+        dispatch->QueryInterface(IID_PPV_ARGS(&shellDispatch));
+        dispatch->Release();
+      }
+      shellViewFolder->Release();
+    }
+    viewDisp->Release();
+  }
+  return shellDispatch;
+}
+
+static bool
+ShellExecInExplorerProcess(wchar_t* path, wchar_t* args = nullptr)
+{
+  bool rv = false;
+  if (SUCCEEDED(CoInitialize(nullptr))) {
+    IShellView *desktopView = GetDesktopWindowShellView();
+    if (desktopView) {
+      IShellDispatch2 *shellDispatch = GetApplicationFromShellView(desktopView);
+      if (shellDispatch) {
+        BSTR bstrPath = SysAllocString(path);
+        VARIANT vArgs;
+        VariantInit(&vArgs);
+        if (args) {
+          vArgs.vt = VT_BSTR;
+          vArgs.bstrVal = SysAllocString(args);
+        }
+        rv = SUCCEEDED(shellDispatch->ShellExecuteW(bstrPath, vArgs, VARIANT{},
+                                                    VARIANT{}, VARIANT{}));
+        VariantClear(&vArgs);
+        SysFreeString(bstrPath);
+        shellDispatch->Release();
+      }
+      desktopView->Release();
+    }
+    CoUninitialize();
+  }
+  return rv;
+}
+
+struct stack_t {
+  stack_t* next;
+  TCHAR text[MAX_PATH];
+};
+
+/**
+ * Removes an element from the top of the NSIS stack
+ *
+ * @param  stacktop A pointer to the top of the stack
+ * @param  str      The string to pop to
+ * @param  len      The max length
+ * @return 0 on success
+ */
+int
+popstring(stack_t **stacktop, TCHAR *str, int len)
+{
+  // Removes the element from the top of the stack and puts it in the buffer
+  stack_t *th;
+  if (!stacktop || !*stacktop) {
+    return 1;
+  }
+
+  th = (*stacktop);
+  lstrcpyn(str, th->text, len);
+  *stacktop = th->next;
+  HeapFree(GetProcessHeap(), 0, th);
+  return 0;
+}
+
+/**
+ * Adds an element to the top of the NSIS stack
+ *
+ * @param  stacktop A pointer to the top of the stack
+ * @param  str      The string to push on the stack
+ * @param  len      The length of the string to push on the stack
+ * @return 0 on success
+ */
+void
+pushstring(stack_t **stacktop, const TCHAR *str, int len)
+{
+  stack_t *th;
+  if (!stacktop) {
+    return;
+  }
+  th = (stack_t*)HeapAlloc(GetProcessHeap(), 0, sizeof(stack_t) + len);
+  lstrcpyn(th->text, str, len);
+  th->next = *stacktop;
+  *stacktop = th;
+}
+
+/**
+* Starts an executable or URL from the shell process.
+*
+* @param  stacktop  Pointer to the top of the stack, AKA the first parameter to
+                    the plugin call. Should contain the file or URL to execute.
+* @return 1 if the file/URL was executed successfully, 0 if it was not
+*/
+extern "C" void __declspec(dllexport)
+Exec(HWND, int, TCHAR *, stack_t **stacktop, void *)
+{
+  wchar_t path[MAX_PATH + 1];
+  wchar_t args[MAX_PATH + 1];
+  bool rv = false;
+  bool restoreArgString = false;
+  // We're skipping building the C runtime to keep the file size low, so we
+  // can't use a normal string initialization because that would call memset.
+  path[0] = L'\0';
+  args[0] = L'\0';
+  popstring(stacktop, path, MAX_PATH);
+  if (popstring(stacktop, args, MAX_PATH) == 0) {
+    // This stack item may not be for us, but we don't know yet.
+    restoreArgString = true;
+  }
+
+  if (lstrcmpW(args, L"/cmdargs") == 0) {
+    popstring(stacktop, args, MAX_PATH);
+    rv = ShellExecInExplorerProcess(path, args);
+  } else {
+    // If the stack wasn't empty, then we popped something that wasn't for us.
+    if (restoreArgString) {
+      pushstring(stacktop, args, lstrlenW(args));
+    }
+    rv = ShellExecInExplorerProcess(path);
+  }
+
+  pushstring(stacktop, rv ? L"1" : L"0", 2);
+}
+
+BOOL APIENTRY
+DllMain(HMODULE, DWORD, LPVOID)
+{
+  return TRUE;
+}