// Opens virtual key not for regular operation, but just
// when RegOpen*/RegCreate* is called, so access checking is not so strict
// as for operation
// TODO: don't check security access mode on open,
// make just a reg function call check it
internal VirtualKey OpenKeyPreliminarily(KeyIdentity existingBase, KeyIdentity identity, KeySecurity samDesired)
{
foreach (KeyDisposition disposition in VirtualKey.HIVES_ORDER)
{
try
{
VirtualKey key;
if (TryOpenKey(existingBase, disposition, identity, samDesired, out key))
{
return(key);
}
// Key not found
if (!samDesired.IsOnlyForRead())
{
// Key not present in reghive and write access requested
// we can't give it in hives other than DIFF_HIVE
throw new FileNotFoundException();
}
}
catch (AccessDeniedException)
{
if (!identity.IsSystemKey() || disposition == KeyDisposition.WINDOWS_REG)
{
// Access denied in reghive (may happen if key is system key)
// but if not a system key
throw;
}
}
if (identity.IsSystemKey() && !samDesired.IsOnlyForRead())
{
// Relaxing access (some apps request write access and do not use it
// we want to make them work
samDesired.RelaxToReadAccess();
}
}
throw new FileNotFoundException();
}
private static bool CheckSystemKeyAccess(KeyDisposition disposition,
KeyIdentity identity, KeySecurity samDesired)
{
// This way we redirect system registry locations into windows registry
// and make it fail for write operations
if (disposition != KeyDisposition.WINDOWS_REG &&
identity.IsSystemKey())
{
if (samDesired.IsOnlyForRead())
{
// So that it retries to read from system registry
return(false);
}
// So that user gets appropriate error code
throw new AccessDeniedException();
}
return(true);
}
internal bool IsMarkedAsDeleted(KeyIdentity existingBase, KeyIdentity identity)
{
if (identity.IsSystemKey())
{
return(false);
}
try
{
return(DoesntExistOrMarkedAsDeleted(existingBase, identity,
IMAD_pData_.Ptr, IMAD_pcbData_.Ptr) == DoesntExistOrMarkedAsDeletedState.MarkedAsDeleted);
}
catch (FileNotFoundException)
{
// We don't know anything about the key, so it was not marked as deleted
return(false);
}
catch (Win32Exception ex)
{
DebugLogger.WriteLine("IsDeleted exception " + ex.ToString());
throw;
}
}