[keycloak-dev] Application and server in separate networks

[Niels Bertram]

Hi Christian,

can't say for sure but the server side adapters always use standard
authorization flow, which requires your Java app to connect via a back
channel to (A) exchange code grant for access tokens and (B) to lookup jwks
for token validation.

The OpenID Connect specification does provide a pure browser based flow
called implicit flow
<http://openid.net/specs/openid-connect-core-1_0.html#ImplicitFlowAuth> but
that one has a few drawbacks such as auth tokens delivered in the redirect
URL and no refresh token capability. Using this flow could solve your
problem (A) to shift login flow to the frontend but still poses the
challenge for (B) validating the tokens at the backend.

I could not find a way to configure the Java adapter to work in pure
offline validation mode. We had a similar requirement some time ago and had
to code our own auth module to validate incoming tokens with a
pre-configured public key. The other common problem we ran into is wanting
to validate tokens from different (including non-keycloak) issuers on the
same backend. The Keycloak Java adapters do not support this use case
either. We originally looked at the Spring JWT adapter
<https://github.com/spring-projects/spring-security-oauth/tree/master/spring-security-jwt>
as an alternative but this project is not properly patched and
configuration is a wonderful garden of mystery like everything in Spring.

Very curious though to see what others are doing.

Cheers,
Niels


On Thu, Apr 19, 2018 at 2:16 AM, Christian Beikov <
christian.beikov at gmail.com> wrote:

> As far as I see in the code, the Java Adapters always use the standard
> flow i.e. response_type=code
>
> Please tell me this observation is wrong and there is an undocumented
> setting I just didn't see that I can use to tell the adapter to use the
> implicit flow instead :|
>
> If this is really missing, where would you suggest this should be
> configured? I'd expect the setting to be in KeycloakDeployment and
> OAuthRequestAuthenticator#loginRedirect would then use the value instead
> of always using the "code" value.
>
>
> Mit freundlichen Grüßen,
> ------------------------------------------------------------------------
> *Christian Beikov*
> Am 18.04.2018 um 17:35 schrieb Christian Beikov:
> >
> > Is there any way to avoid the access code to access token exchange?
> > Since the Keycloak server is not accessible, I'm getting an error
> > during authentication:
> >
> >  ERROR [org.keycloak.adapters.OAuthRequestAuthenticator] (default
> > task-54) failed to turn code into token:
> > java.net.UnknownHostException: blabla.local: unknown error
> >         ...
> >         at
> > org.keycloak.adapters.ServerRequest.invokeAccessCodeToToken(
> ServerRequest.java:111)
> >         at
> > org.keycloak.adapters.OAuthRequestAuthenticator.resolveCode(
> OAuthRequestAuthenticator.java:330)
> >         at
> > org.keycloak.adapters.OAuthRequestAuthenticator.authenticate(
> OAuthRequestAuthenticator.java:275)
> >         at
> > org.keycloak.adapters.RequestAuthenticator.authenticate(
> RequestAuthenticator.java:139)
> >         at
> > org.keycloak.adapters.undertow.AbstractUndertowKeycloakAuthMe
> ch.keycloakAuthenticate(AbstractUndertowKeycloakAuthMech.java:110)
> >         at
> > org.keycloak.adapters.undertow.ServletKeycloakAuthMech.authenticate(
> ServletKeycloakAuthMech.java:92)
> >         ...
> >
> >
> > Mit freundlichen Grüßen,
> > ------------------------------------------------------------------------
> > *Christian Beikov*
> > Am 18.04.2018 um 14:48 schrieb Thomas Darimont:
> >> Hello Christian,
> >>
> >> your application server needs to communicate with the Keycloak server
> >> to retrieve the realm public key referenced in the token to verify
> >> the token signature.
> >> The current implementation in Keycloak fetches & caches unknown
> >> public keys automatically.
> >>
> >> You could also use a fixed realm public key on the application server
> >> side but it would not support key rotation anymore.
> >>
> >> Cheers,
> >> Thomas
> >>
> >> 2018-04-18 13:45 GMT+02:00 Christian Beikov
> >> <christian.beikov at gmail.com <mailto:christian.beikov at gmail.com>>:
> >>
> >>     Hi,
> >>
> >>     is it necessary that an application secured by Keycloak can
> >>     access the
> >>     Keycloak server? Or is it enough if the Browser can access the
> >>     Keycloak
> >>     server?
> >>
> >>     --
> >>
> >>     Mit freundlichen Grüßen,
> >>     ------------------------------------------------------------
> ------------
> >>     *Christian Beikov*
> >>     _______________________________________________
> >>     keycloak-dev mailing list
> >>     keycloak-dev at lists.jboss.org <mailto:keycloak-dev at lists.jboss.org>
> >>     https://lists.jboss.org/mailman/listinfo/keycloak-dev
> >>     <https://lists.jboss.org/mailman/listinfo/keycloak-dev>
> >>
> >>
> >
>
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