[Galene] Re: Help with JWT

[graillot <graillot@crans.org>]

Hello Juliusz,

> I'm currently working on third-party authentication for Galene using 
> JWTs
> ("OAuth2" for those of you who like fancy enterprise acronyms), and I 
> need
> some help from people familiar with JWTs.
> 
> 1. The username should be stored in "aud", right?
> 
> 2. The group name should be stored in "sub", right?  Should that be the
>    naked group name, or the full URL ?

I think the username should be stored in sub and the group name should 
be stored in aud, it is a minor detail though and it should be fine 
either way.
I have a preference for the naked group name rather than the full URL.

> 3. Where do I stash the permissions granted to the user?  Should I use
>    a "collision-resistant" claim name, say 
> "https://galene.org/permissions",
>    or is it enough to just use "permissions"?  Perhaps 
> "galene-permissions"?

I think using a small name such as "perm" is also fine.
I also think that this field should be optional and have a sane default 
(maybe it could be set in the configuration?).

> 4. I'm planning to implement HS256 and ES256.  We good?

I think it's a good set of algorithms.

> -- Juliusz

In addition to that I think that the "nbf" and "exp" fields should also 
be checked by galene to ensure the validity of the token.

Here is a small proof of concept which is a minimal web server that has 
a LDAP backend and generates a token (with no permission at the moment) 
: <https://gitlab.crans.org/esum/jwt-ldap>.

-- 
Benjamin