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;
}
}
}
/// <summary>
/// Returns whether this handle holds at least given standard rights
/// </summary>
/// <param name="rights">The minimum access rights required</param>
/// <returns>A boolean indicating whether this handle holds at minimum given access rights</returns>
public Boolean HasRights(StandardRights rights)
{
return(HasRights((uint)rights));
}
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;
}
}
}
