private static GenericSafeHandle GetReadHandle(int id, bool idIsProcessID)
{
IntPtr tempHandle = IntPtr.Zero;
IntPtr readHandle = IntPtr.Zero;
if (idIsProcessID)
{
GenericSafeHandle procHandle = new GenericSafeHandle(NativeMethods.OpenProcess((int)ProcessRights.QueryInformation, false, id));
if (procHandle.IsInvalid)
{
int err = Marshal.GetLastWin32Error();
switch (err)
{
case NativeConstants.ERROR_ACCESS_DENIED:
throw new UnauthorizedAccessException();
default:
throw new System.ComponentModel.Win32Exception(err);
}
}
using (procHandle)
{
if (!NativeMethods.OpenProcessToken(procHandle, (int)TokenRights.ReadPermissions, out readHandle))
{
int err = Marshal.GetLastWin32Error();
switch (err)
{
case NativeConstants.ERROR_ACCESS_DENIED:
throw new UnauthorizedAccessException();
default:
throw new System.ComponentModel.Win32Exception(err);
}
}
}
}
else
{
GenericSafeHandle threadHandle = new GenericSafeHandle(NativeMethods.OpenThread((int)ThreadRights.QueryInformation, false, id));
if (threadHandle.IsInvalid)
{
int err = Marshal.GetLastWin32Error();
switch (err)
{
case NativeConstants.ERROR_ACCESS_DENIED:
throw new UnauthorizedAccessException();
default:
throw new System.ComponentModel.Win32Exception(err);
}
}
using (threadHandle)
{
if (!NativeMethods.OpenThreadToken(threadHandle, (int)TokenRights.ReadPermissions, false, out readHandle))
{
int err = Marshal.GetLastWin32Error();
switch (err)
{
case NativeConstants.ERROR_ACCESS_DENIED:
throw new UnauthorizedAccessException();
default:
throw new System.ComponentModel.Win32Exception(err);
}
}
}
}
return new GenericSafeHandle(readHandle);
}
public GenericSafeHandle(IntPtr newHandle, GenericSafeHandle oldHandle)
: this(newHandle, oldHandle.m_ReleaseCallback)
{
oldHandle.Close();
}
internal BaseSecurity(GenericSafeHandle objectHandle, ResourceType resType, AccessControlSections sectionsRequested, bool isContainer)
: base(isContainer, resType, objectHandle, sectionsRequested)
{
m_Handle = objectHandle;
}
public GenericSafeHandle(IntPtr newHandle, GenericSafeHandle oldHandle)
: this(newHandle, oldHandle.m_ReleaseCallback)
{
oldHandle.Close();
}
private void MakeWriteableHandle(AccessControlSections sectionsToWrite)
{
StandardRights rightsRequired = m_HandleRights;
bool newHandleRequired = false;
if ((sectionsToWrite & AccessControlSections.Access) != 0 || (sectionsToWrite & AccessControlSections.Group) != 0)
{
if ((m_HandleRights & StandardRights.WritePermissions) == 0)
{
rightsRequired |= StandardRights.WritePermissions;
newHandleRequired = true;
}
}
if ((sectionsToWrite & AccessControlSections.Owner) != 0)
{
if ((m_HandleRights & StandardRights.TakeOwnership) == 0)
{
rightsRequired |= StandardRights.TakeOwnership;
newHandleRequired = true;
}
}
if ((sectionsToWrite & AccessControlSections.Audit) != 0)
{
if ((m_HandleRights & (StandardRights)NativeConstants.ACCESS_SYSTEM_SECURITY) == 0)
{
rightsRequired |= (StandardRights)NativeConstants.ACCESS_SYSTEM_SECURITY;
newHandleRequired = true;
}
}
if (newHandleRequired)
{
IntPtr writeHandle = NativeMethods.DuplicateHandle(m_Handle.DangerousGetHandle(), (int)rightsRequired);
if (writeHandle == IntPtr.Zero)
{
int err = Marshal.GetLastWin32Error();
switch (err)
{
case NativeConstants.ERROR_ACCESS_DENIED:
throw new UnauthorizedAccessException();
default:
throw new System.ComponentModel.Win32Exception(err);
}
}
try
{
m_Handle = new GenericSafeHandle(writeHandle, m_Handle);
m_HandleRights = rightsRequired;
}
catch
{
//Should only happen if out of memory. Release new handle and rethrow.
NativeMethods.CloseHandle(writeHandle);
throw;
}
}
}
