[keycloak-user] Passing External URL Bearer Token to Interior Proxy URL in Multi-Hop scenario

Tue Jan 26 20:51:10 EST 2016

+1 Joe’s request.
In larger deployments with reverse proxies, we control the request url and hostname and ip visible to the keycloak server, so internal IP address concerns are less of an issue.

From: <keycloak-user-bounces at lists.jboss.org<mailto:keycloak-user-bounces at lists.jboss.org>> on behalf of Stian Thorgersen <sthorger at redhat.com<mailto:sthorger at redhat.com>>
Reply-To: "stian at redhat.com<mailto:stian at redhat.com>" <stian at redhat.com<mailto:stian at redhat.com>>
Date: Tuesday, January 26, 2016 at 6:43 PM
To: Joe Strathern <jstrathern at gmail.com<mailto:jstrathern at gmail.com>>
Cc: keycloak-user <keycloak-user at lists.jboss.org<mailto:keycloak-user at lists.jboss.org>>
Subject: Re: [keycloak-user] Passing External URL Bearer Token to Interior Proxy URL in Multi-Hop scenario

You can't. Relative url uses the request url, and when it's using an internal IP address/domain that'll end up being the request url, which will be wrong in your case.

On 25 January 2016 at 23:27, Joe Strathern <jstrathern at gmail.com<mailto:jstrathern at gmail.com>> wrote:
Stian,

Thank you for the reply.
While changing the auth-server-url to an absolute URL (http://external-hostname/auth) for all adapters allowed the token to be passed successfully, the relative URI optimization (http://keycloak.github.io/docs/userguide/keycloak-server/html/applicationClustering.html#relative-uri-optimization) for the auth-server-url is very important functionality I need access to.
By leaving /auth as the auth-server-url, I can access the secured resources by case-insensitive host name, host ip address, http vs https and more, all of which are lost by having to switch to an absolute URL.

How can I retain the relative URL for auth-server-url, allowing my required external requests to pass through keycloak, while allowing the internal requests and hops to use the auth-server-url-for-backend-requests absolute URL to authenticate?

Thanks,
Joe

On Mon, Jan 25, 2016 at 1:08 AM, Stian Thorgersen <sthorger at redhat.com<mailto:sthorger at redhat.com>> wrote:
You'd need to make sure all adapters are configured with the same. http://external-hostname/auth needs to be the auth-server-url on all adapters.

On 21 January 2016 at 23:00, Joe Strathern <jstrathern at gmail.com<mailto:jstrathern at gmail.com>> wrote:
Stian
Thank you for your response.
I am using your Wildfly adapter to secure my WAR. As it is contained in a cluster enviroment with a load balancing proxy, I updated my adapter to have the following settings, much like the example provided at http://keycloak.github.io/docs/userguide/keycloak-server/html/applicationClustering.html#relative-uri-optimization :
{
   ...
   <auth-server-url>/auth</auth-server-url>
   <auth-server-url-for-backend-requests>http:/internal-hostname/auth</auth-server-url-for-backend-requests>
   ...
}

The auth-server-url is still working as expected for the external request, however i am still getting the same 401 error, caused by the mismatching Token audience and Domain when I try to make the hop with my new HTTP request.
As i'm using Keycloak 1.7.0.Final currently, i downloaded the source and debugged, looking for a bit more insight as to what may be occurring.

I noticed that the URL Keycloak is retrieving to compare against the token, is retrieving it from the realmInfoUrl variable of the KeyCloakDeployment object. This variable is unaffected by the auth-server-url-for-backend-requests option. (Instead it affects numerous other URL variabled stored). Therefore, the realmInfoURL remains http://external-hostname/auth.

Then the error occurs as (in this case), the RSATokenVerifier directly compares this Realm URL against the Token Issuer, which differ due hostname (external vs internal, as before).

Is there an additional configuration, or concept I am missing to correct this workflow?

Thanks,
Joe

On Wed, Jan 20, 2016 at 1:22 AM, Stian Thorgersen <sthorger at redhat.com<mailto:sthorger at redhat.com>> wrote:
Assuming you are using our adapters there are two separate urls to configure: "auth-server-url" is the external one, auth-server-url-for-backend-requests is the internal one. See http://keycloak.github.io/docs/userguide/keycloak-server/html/ch08.html#adapter-config for more details.

On 19 January 2016 at 22:20, Joe Strathern <jstrathern at gmail.com<mailto:jstrathern at gmail.com>> wrote:
Hello Keycloak Community

I am looking for some assistance on how to pass a Keycloak bearer token in the multi-hop scenario, where the keycloak instance is inside a proxy environment, the next hop is within the proxy, and the original request came from outside of that environment.

For instance, the original request goes to http://external-hostname/auth, where external-hostname is a proxy system. Login is successful, and I receive a Bearer Token with Token issuer - http://external-hostname/auth/realms/My_Realm.

Now i need to take that token from the HTTP request, and attach it to a new request from inside the proxy. I do so, redirecting to http://interior-hostname/API, secured by the same Keycloak. Using "external-hostname" as host once more is not an option, as we are within the proxied environment. However, submitting the hop HTTP request,  i am met with the error:

Failed to verify token: org.keycloak.common.VerificationException: Token audience doesn't match domain. Token issuer is http://external-hostname/auth/realms/My_Realm, but URL from configuration is http://internal-hostname/auth/realms/My_Realm

The token is rejected (Since the hostnames are not the exact same), however external-hostname and internal-hostname are the same machine.

Is there a way that Keycloak can identify these hostnames as equivalent to accept the token, or another policy that should be followed in this situation?

Thanks,
Joe

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