You can check where you are allowed to consume in public on this website (click the button saying “Verstanden, zeig mir die Karte!”, you are agreeing to a no warranty disclaimer): https://bubatzkarte.de
The regulations don’t apply to private spaces and only when in sight of the protected locality in the centre of the red circles.
And there are other regulations, so many other regulations…
But hey, I can at least legally consume in the privacy of my own home now, so I got that going for me, which is nice.
Not (yet) in germany. Currently possession and growing your own stuff, in certain quantaties, is allowed but you can not buy it legally yet. Starting from july there will be social clubs which can sell to members but only without making a profit.