[keycloak-user] [Conception] how to define a suitable realm

[GARDAIS Ionel]

Thanks for your reply, Rafael. 

What are realms for if this can be solved with a single-realm and ABAC ? 
When are realms a better option to consider over ABAC ? 



De: "Rafael Weingärtner" <rafaelweingartner at gmail.com> 
À: "Ionel GARDAIS" <ionel.gardais at tech-advantage.com> 
Cc: "keycloak-user" <keycloak-user at lists.jboss.org> 
Envoyé: Lundi 13 Août 2018 14:59:43 
Objet: Re: [keycloak-user] [Conception] how to define a suitable realm 

Well, it is an ABAC (attribute-based access control) system. You can use a single realm and add an attribute let’s say X with value Y that is requested by AppA and AppB. Then, you add this attribute to all users that need access to AppA and AppB. The same for your case of AppB and AppC. 

Also, bear in mind OpenID Connect and SAML are not just single sign-on tools. They are federated systems protocols. In a federation, you can have multiple SP and IdP. There is nothing that forbids SPs to work with multiple IdPs. 

On Mon, Aug 13, 2018 at 9:46 AM, GARDAIS Ionel < [ mailto:ionel.gardais at tech-advantage.com | ionel.gardais at tech-advantage.com ] > wrote: 


Hi list, 

I have a question about the creation of the realms in Keycloak. 
It may be SSO-101 but I can't figure the right answer. 

As I understand it, a realm is a collection of clients sharing the same policies. 
A user logged from one client in a realm will be authenticated in all other clients in the same realm. 

Say I have 3 apps AppA, AppB and AppC. 
I want a user to be SSO'ed with AppA and AppB (not AppC). 
I also want a user to be SSO'ed with AppB and AppC (not AppA). 

I guess I need a realm covering AppA and AppB and another realm covering AppB and AppC. 
However, most (if not all) clients I've seen only allow one IDP definition thus forbids AppB to know both realms. 


How to solve this ? 

Regards, 
Ionel 

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232 avenue Napoleon BONAPARTE 92500 RUEIL MALMAISON

Capital EUR 219 300,00 - RCS Nanterre B 408 832 301 - TVA FR 09 408 832 301