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/* 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/DynamicFn.h>
#include <rfb_win32/Service.h>
#include <rfb_win32/OSVersion.h>
#include <lmcons.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() : isSafe_(false) {
if (isServiceProcess()) {
// If the platform is Windows 95/98/Me then we must fake the token's presence
if (osVersion.isPlatformWindows) {
try {
UserName un;
h = INVALID_HANDLE_VALUE;
} catch (rdr::SystemException& e) {
if (e.err != ERROR_NOT_LOGGED_ON)
throw;
if (FindWindow(shellIconClass, 0))
h = INVALID_HANDLE_VALUE;
}
isSafe_ = (h != 0);
return;
}
// Try to get the user token using the Terminal Services APIs
// NB: This will only work under XP/2003 and later
typedef BOOL (WINAPI *WTSQueryUserToken_proto)(ULONG, PHANDLE);
DynamicFn<WTSQueryUserToken_proto> _WTSQueryUserToken(_T("wtsapi32.dll"), "WTSQueryUserToken");
if (_WTSQueryUserToken.isValid()) {
(*_WTSQueryUserToken)(-1, &h);
isSafe_ = true;
return;
}
// Try to find the Shell Tray Icon window and take its token
// NB: This will only work under NT/2K (and later, but they're dealt with above)
// NB: If the shell is not running then this will return an Unsafe Null token.
EnumDesktops(GetProcessWindowStation(), enumDesktops, (LPARAM)&h);
isSafe_ = (h != 0);
} 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);
// Under Windows 95/98/Me, we fake the handle value...
h = INVALID_HANDLE_VALUE;
}
isSafe_ = true;
}
}
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));
}
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