Initial commit

win/rfb_win32/CurrentUser.cxx

@@ -0,0 +1,121 @@
+/* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
+ * 
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+
+// -=- Currentuser.cxx
+
+#include <stdlib.h>
+#include <rfb/LogWriter.h>
+#include <rfb_win32/CurrentUser.h>
+#include <rfb_win32/Service.h>
+#include <lmcons.h>
+#include <wtsapi32.h>
+
+using namespace rfb;
+using namespace win32;
+
+static LogWriter vlog("CurrentUser");
+
+
+const TCHAR* shellIconClass = _T("Shell_TrayWnd");
+
+BOOL CALLBACK enumWindows(HWND hwnd, LPARAM lParam) {
+  TCHAR className[16];
+  if (GetClassName(hwnd, className, sizeof(className)) &&
+      (_tcscmp(className, shellIconClass) == 0)) {
+    vlog.debug("located tray icon window (%s)", (const char*)CStr(className));
+    DWORD processId = 0;
+    GetWindowThreadProcessId(hwnd, &processId);
+    if (!processId)
+      return TRUE;
+    Handle process = OpenProcess(MAXIMUM_ALLOWED, FALSE, processId);
+    if (!process.h)
+      return TRUE;
+    if (!OpenProcessToken(process, MAXIMUM_ALLOWED, (HANDLE*)lParam))
+      return TRUE;
+    vlog.debug("obtained user token");
+    return FALSE;
+  }
+  return TRUE;
+}
+
+BOOL CALLBACK enumDesktops(LPTSTR lpszDesktop, LPARAM lParam) {
+  HDESK desktop = OpenDesktop(lpszDesktop, 0, FALSE, DESKTOP_ENUMERATE);
+  vlog.debug("opening \"%s\"", lpszDesktop);
+  if (!desktop) {
+    vlog.info("desktop \"%s\" inaccessible", (const char*)CStr(lpszDesktop));
+    return TRUE;
+  }
+  BOOL result = EnumDesktopWindows(desktop, enumWindows, lParam);
+  if (!CloseDesktop(desktop))
+    vlog.info("unable to close desktop: %ld", GetLastError());
+  return result;
+}
+
+
+CurrentUserToken::CurrentUserToken() {
+  if (isServiceProcess()) {
+    // Try to get the user token using the Terminal Services APIs
+    WTSQueryUserToken(-1, &h);
+  } else {
+    // Try to open the security token for the User-Mode process
+    if (!OpenProcessToken(GetCurrentProcess(), GENERIC_ALL, &h)) {
+      DWORD err = GetLastError();
+      if (err != ERROR_CALL_NOT_IMPLEMENTED)
+        throw rdr::SystemException("OpenProcessToken failed", err);
+      h = INVALID_HANDLE_VALUE;
+    }
+  }
+}
+
+
+ImpersonateCurrentUser::ImpersonateCurrentUser() {
+  RegCloseKey(HKEY_CURRENT_USER);
+  if (!isServiceProcess())
+    return;
+  if (!token.canImpersonate())
+    throw rdr::Exception("Cannot impersonate unsafe or null token");
+  if (!ImpersonateLoggedOnUser(token)) {
+    DWORD err = GetLastError();
+    if (err != ERROR_CALL_NOT_IMPLEMENTED)
+      throw rdr::SystemException("Failed to impersonate user", GetLastError());
+  }
+}
+
+ImpersonateCurrentUser::~ImpersonateCurrentUser() {
+  if (!RevertToSelf()) {
+    DWORD err = GetLastError();
+    if (err != ERROR_CALL_NOT_IMPLEMENTED)
+      exit(err);
+  }
+  RegCloseKey(HKEY_CURRENT_USER);
+}
+
+
+UserName::UserName() : TCharArray(UNLEN+1) {
+  DWORD len = UNLEN+1;
+  if (!GetUserName(buf, &len))
+    throw rdr::SystemException("GetUserName failed", GetLastError());
+}
+
+
+UserSID::UserSID() {
+  CurrentUserToken token;
+  if (!token.canImpersonate())
+    return;
+  setSID(Sid::FromToken(token.h));
+}