I don't think it does. I think one needs material things to some extent to be happy.

If for example, a person is homeless without decent clothes, food, or something to do, I don't see it being remotely possible that they're happy.

Even if one does have a roof over their head, if they're living in poverty and unable to do things they're passionate about; what would the point of living even be?

So no, happiness doesn't come from within because humans need external things to survive and thrive.