[keycloak-dev] Support for SSO bridge with shared user base

[Vlastimil Elias]

Hi,


I'd like to implement SSO bridge between Keycloak used for our website, 
and other SAML 2 based SSO server used by another website.

Both SSO servers share common user base (user federation provider in 
keycloak against same user store as the SAML SSO server).

What I want to achieve is that once user is logged in on other SAML SSO 
server and then comes to Keycloak site I'd like to login him there 
automatically.

What I can do is to configure SAML Identity Provider in Keycloak and 
enable "Authenticate By Default" for it. But I think this will always 
lead to user creation conflict in Keycloak as we share user base. I have 
to somehow force this "SAML Identity Provider" in keycloak to directly 
use existing Keycloak users instead of creating new one and linking to them.

Is this somehow achievable in Keycloak 1.5, eg. by development of some 
extension? From what I know I think it s not achievable and feature must 
be coded into keycloak core.


And one other question ;-)
When "Authenticate By Default" is used for some Identity Provider then I 
believe that Keycloak redirects user's browser to this provider in 
passive mode before showing own login page to get identity from it if 
any. But what happen if the provider is unreachable? In this case user 
finishes with erro page and is not able to login into Keycloak at all.
Is Keycloak able to detect provider failure and stop redirecting user 
there?

Thanks in advance

Vlastimil

-- 
Vlastimil Elias
Principal Software Engineer
jboss.org Development Team