[keycloak-dev] Users and Realms

[Federico Michele Facca]

Dear Pedro,
this is a very relevant discussion to us. We currently solved the issue
using a single realm,
and using "root" level groups with a attribute "tenant=true". We have then
created a custom
client to manage this configuration from the single "tenant" admin
perspective.

This solution for us allows to manage "multi-tenancy" also at the single
oidc client without
much complexity (your approach wouldn't allow for that, right?)
Of course we had to use some tricks to do fine grained control access,
which is basically working under the assumption you attach users to groups
and you
manage roles attached to groups and not to users. Then, within the token,
we return
user roles per client based on their group membership.

Cheers,
Federico

On Thu, 16 May 2019 at 17:55, Pedro Igor Silva <psilva at redhat.com> wrote:

> Hi,
>
> As you know, currently users belong to a realm and as such, you can't share
> them across different realms. We always had people looking for alternatives
> about how to solve this problem where all the available options have their
> pros and cons.
>
> I would like to see what you think about decoupling users from realms in a
> way that user federation and management are completely decoupled from
> realms so that users (or group of users) can be *associated* with realms.
>
> As an example, here is how you would configure users and realms in
> Keycloak:
>
> 1) Configure your identity stores/user federation from where users will be
> fetched. Or create users in Keycloak.
>
> 2) Assign to your users a label or a logical group. This assignment could
> be done manually or even automatically depending on:
>
>     a) default group where all users are in
>     b) the identity store from where users are fetched
>     c) based on the user's email (domain)
>     d) anything else that makes sense
>
> 3) Create a realm and specify which users should belong to a realm based on
> these labels or groups. A realm should be able to have users with different
> labels/groups.
>
> The realm definition/configuration would not change much as it stands
> today. Each of them would still have their own way of managing realm
> specific groups and roles.
>
> Regards.
> Pedro Igor
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