How can i restrict client access to only one group of users in keycloak?

Question

I have a client in keycloak for my awx(ansible tower) webpage. I need only the users from one specific keycloak group to be able to log in through this client.

How can I forbid all other users(except from one particular group) from using this keycloak client?

Answer 1

On Keycloak admin console, go to Clients menu, select your client. On the client configuration page, set Authorization Enabled: On, click Save. A new Authorization tab should appear, go to it, then to the Policies tab underneath, click Create Policy and select Group-based policy. There, you can restrict access to specific groups, assuming you have defined your groups via the Groups menu already.

Answer 2

Solved: 1.Create a new role in keycloak. 2. Assign this role to the group. 3. Create new authentication script in keycloak. Configure which role is allowed upon login (e.g. user.hasRole(realm.getRole("yourRoleName")) ). 4. In client setting, under "Authentication Flow overrides" choose the created authentication(from step 3).

Answer 3

If it can help, here is a script which helps implementing this behaviour for any client: if the client contains a given role (here it is called feature:authenticate), then the script checks whether the user has the role and shows an error page (a new template that needs to be deployed in the theme) if not.

AuthenticationFlowError = Java.type("org.keycloak.authentication.AuthenticationFlowError");

 function authenticate(context) {
    var MANDATORY_ROLE = 'feature:authenticate';
    var username = user ? user.username : "anonymous";

    var client = session.getContext().getClient();

    LOG.debug("Checking access to authentication for client '" + client.getName() + "' through mandatory role '" + MANDATORY_ROLE + "' for user '" + username + "'");

    var mandatoryRole = client.getRole(MANDATORY_ROLE);

    if (mandatoryRole === null) {
        LOG.debug("No mandatory role '" + MANDATORY_ROLE + "' for client '" + client.getName() + "'");
        return context.success();
    }

    if (user.hasRole(mandatoryRole)) {
        LOG.info("Successful authentication for user '" + username + "' with mandatory role '" + MANDATORY_ROLE + "' for client '" + client.getName() + "'");
        return context.success();
    }

    LOG.info("Denied authentication for user '" + username + "' without mandatory role '" + MANDATORY_ROLE + "' for client '" + client.getName() + "'");
    return denyAccess(context, mandatoryRole);
 }

 function denyAccess(context, mandatoryRole) {
    var formBuilder = context.form();
    var client = session.getContext().getClient();
    var description = !mandatoryRole.getAttribute('deniedMessage').isEmpty() ? mandatoryRole.getAttribute('deniedMessage') : [''];
    var form = formBuilder
        .setAttribute('clientUrl', client.getRootUrl())
        .setAttribute('clientName', client.getName())
        .setAttribute('description', description[0])
        .createForm('denied-auth.ftl');
    return context.failure(AuthenticationFlowError.INVALID_USER, form);
 }