DEV Community

Cover image for Keycloak Express Openid-client
Austin Cunningham
Austin Cunningham

Posted on • Edited on

Keycloak Express Openid-client

#keycloak #express #oidc #passport

Keycloak is deprecating their client adapters (keycloak-connect) for Node and recommending openid-client as a replacement.

Setup Keycloak

First I download keycloak extract it and you can run it with the following command



bin/kc.sh start-dev
Enter fullscreen mode Exit fullscreen mode

You can then login http://localhost:8080, first time you do keycloak asks you to set an admin user and password.

Create a Realm and give it an name and create it. I am using keycloak-express for my realm name
Create realm

The create a Client using openid-connect in the Realm
Create a client

Set the Valid Redirect URIs and select save,
set valid redirect URIs

NOTE:you can specify specific routes here but I am using a wild card(not recommend best practice)

Create a user its documented here so I won't go into it.

That's it for Keycloak setup

Setup Openid-client with Passport in Express

We are going to use this openid-client and passport to connect to keycloak. I install the following



npm install passport
npm install openid-client
npm install express-session
npm install express
Enter fullscreen mode Exit fullscreen mode

From the Realm we need the openid-configuration can be got from an endpoint 



/realms/{realm-name}/.well-known/openid-configuration
Enter fullscreen mode Exit fullscreen mode

So in my case the realm name is keycloak-express so the url will be http://localhost:8080/realms/keycloak-express/.well-known/openid-configuration the output is as follows
.well-known url output
All we need is this issuer:"http://localhost:8080/realms/keycloak-express" url to connect openid-client to keycloak as follows



'use strict';

import express from 'express';
import { Issuer, Strategy } from 'openid-client';
import passport from 'passport';
import expressSession from 'express-session';

const app = express();

// use the issuer url here
const keycloakIssuer = await Issuer.discover('http://localhost:8080/realms/keycloak-express')
// don't think I should be console.logging this but its only a demo app
// nothing bad ever happens from following the docs :)
console.log('Discovered issuer %s %O', keycloakIssuer.issuer, keycloakIssuer.metadata);

// client_id and client_secret can be what ever you want
// may be worth setting them up as env vars 
const client = new keycloakIssuer.Client({
    client_id: 'keycloak-express',
    client_secret: 'long_secret-here',
    redirect_uris: ['http://localhost:3000/auth/callback'],
    post_logout_redirect_uris: ['http://localhost:3000/logout/callback'],
    response_types: ['code'],
  });
Enter fullscreen mode Exit fullscreen mode

I then setup express sessions



var memoryStore = new expressSession.MemoryStore();
app.use(
    expressSession({
    secret: 'another_long_secret',
    resave: false,
    saveUninitialized: true,
    store: memoryStore
    })
);
Enter fullscreen mode Exit fullscreen mode

Then setup passport to use open connect id strategy 



app.use(passport.initialize());
app.use(passport.authenticate('session'));

// this creates the strategy
passport.use('oidc', new Strategy({client}, (tokenSet, userinfo, done)=>{
        return done(null, tokenSet.claims());
    })
)

passport.serializeUser(function(user, done) {
    done(null, user);
  });
passport.deserializeUser(function(user, done) {
    done(null, user);
});
Enter fullscreen mode Exit fullscreen mode

Most of above is copied from the passport docs, I found this blog helpful in explaining serialize/deserialize.

Next I setup the authentication route this makes use of the the callback redirect_uris: from the keycloakIssuer.Client



// default protected route /test
app.get('/test', (req, res, next) => {
    passport.authenticate('oidc')(req, res, next);
});

// callback always routes to test 
app.get('/auth/callback', (req, res, next) => {
    passport.authenticate('oidc', {
      successRedirect: '/testauth',
      failureRedirect: '/'
    })(req, res, next);
});
Enter fullscreen mode Exit fullscreen mode

I then setup a function to check if a route is authenticated



// function to check weather user is authenticated, req.isAuthenticated is populated by password.js
// use this function to protect all routes
var checkAuthenticated = (req, res, next) => {
    if (req.isAuthenticated()) { 
        return next() 
    }
    res.redirect("/test")
}
Enter fullscreen mode Exit fullscreen mode

This can then be used on protected routes



app.get('/testauth', checkAuthenticated, (req, res) => {
    res.render('test');
});

app.get('/other', checkAuthenticated, (req, res) => {
    res.render('other');
});

//unprotected route
app.get('/',function(req,res){
    res.render('index');
});
Enter fullscreen mode Exit fullscreen mode

Finally I set the logout route up this also uses a callback post_logout_redirect_uris from the keycloakIssuer.Client



// start logout request
app.get('/logout', (req, res) => {
    res.redirect(client.endSessionUrl());
});

// logout callback
app.get('/logout/callback', (req, res) => {
    // clears the persisted user from the local storage
    req.logout();
    // redirects the user to a public route
    res.redirect('/');
});
Enter fullscreen mode Exit fullscreen mode

And set the app to listen



app.listen(3000, function () {
  console.log('Listening at http://localhost:3000');
});
Enter fullscreen mode Exit fullscreen mode

Repo here with some extra code around views. Looks like this

login flow

Top comments (28)

Collapse
 
darknessm0404 profile image
Micaël Félix •

Just for information if you follow this but have no render feature installed in express, it will fail with "Cannot GET /testauth" even if it's connected.
Just use res.send('You are connected'); instead of res.render('test'); for the /testauth route.

Collapse
 
keztur profile image
Kez •

Since Version 0.6.0 of passport the "logout" method is asynchronous. The "logout callback" must therefore be changed to.

// logout callback
app.get('/logout/callback', (req, res, next) => {
    req.logout((err) => {
        if (err) { return next(err) }
        res.redirect('/');
    });      
});
Enter fullscreen mode Exit fullscreen mode

Maybe you can update your tutorial accordingly. (Your article was a great help!)

Collapse
 
keztur profile image
Kez •

While trying to connect a vue application to keycloak using your code I noticed that there seems to be no further communication between keycloak and nodejs after a successful login. Once a session is created the validity of the connection between browser and nodejs is based on the validity of the session cookie alone.
In other words: If I end the session in keycloak by other means (e.g. logout by another client or by admin) then the express application won't notice.
Is this intended or did I make a mistake?
It looks to me like you switch from an oidc authentication to a http-cookie authentication.
Shouldn't there be a check in regular intervalls whether the user is still logged-in in keycloak? Or do you have an idea how this could beachived?

Collapse
 
austincunningham profile image
Austin Cunningham •

Hmm yea interesting problem, I didn't factor in logging out by keycloak admin or by another client my logic is only triggered when you hit the endpoint in express. Here is another example using bearer which might be better suited to your use case github.com/keycloak/keycloak/discu.... A regular check sounds like the way I would go , I don't believe that express-sessions has an event emitted on session expired. Without digging to much into it I would create another endpoint /check-session and poll it using fetch something like

setInterval(() => {
  fetch('/check-session')
    .then(response => response.json())
    .then(data => {
      // Handle the received data from the server
      console.log(data);
    })
    .catch(error => {
      // Handle any errors that occur during the request
      console.error(error);
    });
}, 5000); // Poll every 5 seconds
Enter fullscreen mode Exit fullscreen mode

I haven't tested it but it should probably work.

Collapse
 
keztur profile image
Kez • • Edited

Thank you. But I finally decided to go for a different server technology. I never used NodeJS in a production environment before and I was rather shocked as I saw the long "todo list" for doing so. I don't feel inclined to study the 25th "library", "adapter", "plug-in" or whatever is necessary just to store session cookies.
So I came back to my good old PHP/Apache backend using "jumbojett" as on OIDC adapter.
However - I just wanted to let you know that I also rely on http sessions. But what I do to keep the connection to keycloak is: I store the access token in a session variable (in the backend) and with each AJAX request (it's a Vue SPA) I send the access token to keycloak to verify whether the user is still authorized.
So there are actually two sessions running (just like in your example), one in PHP/Apache and one in keycloak. And I need to make sure that the PHP session is at least as long (time-wise) as the keycloak session.
I believe this is something which would work in your example too.

Collapse
 
devtorello profile image
Tatiana Vitorello •

Hey, Austin! Thank you so much for your article, I was able to make it work locally with it! :D

However, I'm facing some issues to run my application on docker. When I try to run both Keycloak and the application on containers, I receive the following error:

Error: connect ECONNREFUSED 127.0.0.1:8080
users-app  |     at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1195:16) {
users-app  |   errno: -111,
users-app  |   code: 'ECONNREFUSED',
users-app  |   syscall: 'connect',
users-app  |   address: '127.0.0.1',
users-app  |   port: 8080
users-app  | }
Enter fullscreen mode Exit fullscreen mode

I'm running keycloak through docker-compose on port 8080 and using http://localhost:8080/auth/realms/my-realm/.well-known/openid-configuration on Issuer.discover. When trying to access this link through the browser, it works normally.

Do you have some hint on what may be causing it? I tried to tie a bridge network between keycloak container and nodejs container and it did not work also.

Collapse
 
austincunningham profile image
Austin Cunningham • • Edited

Thanks for taking the time to try this out in a docker container. So the issue is this line github.com/austincunningham/keyclo... where the localhost is the localhost inside the container and has no visibility on the global localhost (if that makes sense). Some solutions here how-to-connect-to-localhost-within... , I tried

ip addr show docker0
Enter fullscreen mode Exit fullscreen mode

to get the ip address and use that instead of localhost in the code and rebuilt the container

const keycloakIssuer = await Issuer.discover('http://172.17.0.1:8080/realms/keycloak-express')
Enter fullscreen mode Exit fullscreen mode

Looks to be working

docker run -p 3000:3000 quay.io/austincunningham/keycloak-express-openid-client:latest
Discovered issuer http://172.17.0.1:8080/realms/keycloak-express {
  claim_types_supported: [ 'normal' ],
  claims_parameter_supported: true,
  grant_types_supported: [
    'authorization_code',
    'implicit',
    'refresh_token',
    'password',
    'client_credentials',
    'urn:ietf:params:oauth:grant-type:device_code',
    'urn:openid:params:grant-type:ciba'
  ],...
Enter fullscreen mode Exit fullscreen mode
Collapse
 
austincunningham profile image
Austin Cunningham •

There has to be a better way to get the docker0 ip address. This will get it

ifconfig | awk '/docker0/{getline; print}' | awk '{ print $2 }'
Enter fullscreen mode Exit fullscreen mode

You can then create an environment variable

export DOCKERHOST=$(ifconfig | awk '/docker0/{getline; print}' | awk '{ print $2 }')
Enter fullscreen mode Exit fullscreen mode

Change the issuer to use the environment variable

const keycloakIssuer = await Issuer.discover("http://"+ process.env.DOCKERHOST +":8080/realms/keycloak-express")
Enter fullscreen mode Exit fullscreen mode

Can pass it in on docker run

docker run -p 3000:3000 -e DOCKERHOST=$DOCKERHOST quay.io/austincunningham/keycloak-express-openid-client:latest
Enter fullscreen mode Exit fullscreen mode

For docker compose you can use a env file to pass in environment variables

Thread Thread
 
devtorello profile image
Tatiana Vitorello •

Hey, Austin! Sorry for taking so long to reply, but I wanted to thank you for your help! It really helped me and worked like a charm! :)

Collapse
 
devtorello profile image
Tatiana Vitorello •

Also, here's how I configured my apps on docker-compose.yml:

Network:

networks:
  app-tier:
    driver: bridge
Enter fullscreen mode Exit fullscreen mode

Keycloak:

keycloak:
    container_name: keycloak
    image: jboss/keycloak:latest
    restart: always
    environment:
      DB_VENDOR: POSTGRES
      DB_ADDR: postgres
      DB_DATABASE: postgres
      DB_USER: postgres
      DB_SCHEMA: public
      DB_PASSWORD: password
      KEYCLOAK_USER: admin
      KEYCLOAK_PASSWORD: admin
      JDBC_PARAMS: "useSSL=false"
    ports:
      - 8080:8080
    depends_on:
      postgres:
        condition: service_healthy
    networks:
      - app-tier
Enter fullscreen mode Exit fullscreen mode

And Node app:

users-app:
    container_name: users-app
    build: 
      context: .
      dockerfile: ./server/users/Dockerfile
    restart: always
    ports:
      - 8880:8880
    environment:
      - DOPPLER_TOKEN
    networks:
      - app-tier
Enter fullscreen mode Exit fullscreen mode
Collapse
 
nikunjm10 profile image
nikunjm10 •

Hello Austin,
I was using keycloak-connect till now and it was working fine for me. As this adapter is getting deprecated I will try your solution for open-id client adapter, But I have a few questions regarding it.
Can we do role based and attributed encryption using it?
Can we protect the resources using this adapter?
As you will know that in the keycloak.protect() we can pass the roles and attributes. Also for protecting resources we can use keycloak.enforce().

Also we can pass the configuration to the keycloak using the previous adapter, can we do it with the help of this?

Thanks & Regards
Nikunj Mangla

Collapse
 
austincunningham profile image
Austin Cunningham •

Hi Nikunj,
Don't get me wrong here I loved keycloak-connect, it offered so much more out of the box that OpenID client does. OpenID client doesn't have this functionally as it is a generic client to be used with any OIDC provider. I am not sure without further investigation weather it is possible to pass roles within the auth flow or weather its possible to do something similar to keycloak.enforce() on resources, as for passing configuration I suspect that this functionality isn't available via OpenID client. These a all good questions It might be worth raising these with the Keycloak team github.com/keycloak/keycloak/discu... around the deprecation of the Node adapter.

Regards,
Austin

Collapse
 
austincunningham profile image
Austin Cunningham •

Hi Ninkunj,

I was just reading down through the github discussions and looks like roles is possible see github.com/keycloak/keycloak/discu....
Regards,
Austin

Collapse
 
nikunjm10 profile image
nikunjm10 •

Hello Austin,

Thank you for replying to my queries. I have also posted my concerns on the github discussion page. I will try with the roles checking through the link you provided. I am trying another module for now which is @keycloak/keycloak-admin-client not sure though if it will work or not for me. Let's see when they are going to provide a good support for the keycloak on nodejs

Thread Thread
 
kasir-barati profile image
Mohammad Jawad (Kasir) Barati •

Did you manage to do cool stuff like role checking and resource checking with openid-client or any other 3rd party lib. I was trying to achieve the same goal with openid-client but I stuck. Now I am wondering how to check roles, resources, ...

Any update @austincunningham, @nikunjm10 ?

Thread Thread
 
austincunningham profile image
Austin Cunningham •

It was possible to do roles github.com/keycloak/keycloak/discu... there is an example in the discussion. It looks like keycloak-connect will be around for another while github.com/keycloak/keycloak/discu...

Collapse
 
pspaulding profile image
pspaulding •

When using keycloak-connect, a "kauth" object was available on the request object that included all sorts of useful information, including any custom user attributes that were mapped to the access token (kauth.grant.access_token). What would be the equivalent when using passport/openid?

Collapse
 
austincunningham profile image
Austin Cunningham •

I haven't used kauth before but can see how it would be useful. I had a look at the request object returned by passport/openid I couldn't see an equivalent to grant.access_token in the request. So as far as I can see there is no equivalent to kauth.grant.access_token.

Collapse
 
rubybornsinner profile image
Ruben Martins •

HI Austin! I am new to using keycloak, I am a bit confused on how to integrate this solution with a react application that is also secured by keycloak, can you lead me in the right path :)

Collapse
 
austincunningham profile image
Austin Cunningham •

This is not something I have done myself but I think this might cover it for you medium.com/devops-dudes/secure-fro...

Collapse
 
rubybornsinner profile image
Ruben Martins •

Thanks for your reply, I´m doing most exactly like the article you send me but in this case for backend I´m not using the keycloak node adapter but the Keycloak Express Openid-client that is in your article. Right now I´m getting a valid token in my react app but when I´m sending this token in the headers of my requets and use the function that you created to check authentication I´m still getting that I´m not authenticated.
Do I have to trigger the route /test from the react app to set the req.isAuthenticate to true or I just have to check if the token I send it´s valid ?

Thread Thread
 
austincunningham profile image
Austin Cunningham •

Hey Ruben, as I've said its not something I have done so not too sure what advice I should give. I am curious req.isAuthenticated() should check for a valid token . It's something I would like to investigate when I have the time. If I figure it out I will post another blog.

Collapse
 
kasir-barati profile image
Mohammad Jawad (Kasir) Barati •

Hey, look at my repo: github.com/kasir-barati/you-say

I have a NestJS, and react app.

Collapse
 
pspaulding profile image
pspaulding •

Thank you!

Collapse
 
daniel1004k profile image
Daniel Kuruch •

Hey, Austin ! Thank you for your article. But do you have such solution for Fastify ?

Collapse
 
austincunningham profile image
Austin Cunningham •

Hi Daniel, I haven't tried Fastify, but is now on my todo list. I will stick a blog up if I get it working.

Collapse
 
davidjlion profile image
DavidJLion •

Hi Austin. Thanks for your article.
However when I run the application I am getting this error.
Image description

Collapse
 
austincunningham profile image
Austin Cunningham •

Hi David I can reproduce your error with the Keycloak server not running so you may not be running it on the default port

npm start 

> keycloak-express-openid-client@1.0.0 start
> node index.js

node:internal/process/esm_loader:94
    internalBinding('errors').triggerUncaughtException(
                              ^

Error: connect ECONNREFUSED 127.0.0.1:8080
    at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1187:16) {
  errno: -111,
  code: 'ECONNREFUSED',
  syscall: 'connect',
  address: '127.0.0.1',
  port: 8080
}
npm notice 
npm notice New major version of npm available! 8.11.0 -> 9.6.1
npm notice Changelog: https://github.com/npm/cli/releases/tag/v9.6.1
npm notice Run npm install -g npm@9.6.1 to update!
npm notice
Enter fullscreen mode Exit fullscreen mode

This makes sense as Keycloak's default port is 8080
Started up the keycloak server and was able to get it running

 npm start          

> keycloak-express-openid-client@1.0.0 start
> node index.js

Discovered issuer http://localhost:8080/realms/keycloak-express {
  claim_types_supported: [ 'normal' ],
  claims_parameter_supported: true,
  grant_types_supported: [
    'authorization_code',
    'implicit',
    'refresh_token',
    'password',
    'client_credentials',
    'urn:ietf:params:oauth:grant-type:device_code',
    'urn:openid:params:grant-type:ciba'
  ],
  ...
  require_pushed_authorization_requests: false,
  pushed_authorization_request_endpoint: 'http://localhost:8080/realms/keycloak-express/protocol/openid-connect/ext/par/request',
  mtls_endpoint_aliases: {
    token_endpoint: 'http://localhost:8080/realms/keycloak-express/protocol/openid-connect/token',
    revocation_endpoint: 'http://localhost:8080/realms/keycloak-express/protocol/openid-connect/revoke',
    introspection_endpoint: 'http://localhost:8080/realms/keycloak-express/protocol/openid-connect/token/introspect',
    device_authorization_endpoint: 'http://localhost:8080/realms/keycloak-express/protocol/openid-connect/auth/device',
    registration_endpoint: 'http://localhost:8080/realms/keycloak-express/clients-registrations/openid-connect',
    userinfo_endpoint: 'http://localhost:8080/realms/keycloak-express/protocol/openid-connect/userinfo',
    pushed_authorization_request_endpoint: 'http://localhost:8080/realms/keycloak-express/protocol/openid-connect/ext/par/request',
    backchannel_authentication_endpoint: 'http://localhost:8080/realms/keycloak-express/protocol/openid-connect/ext/ciba/auth'
  }
}
Listening at http://localhost:3000
Enter fullscreen mode Exit fullscreen mode
View full discussion (28 comments)

Read next

florianrappl profile image

Hyper-Scale Activated! Ship Your Own FaaS 🤖

Florian Rappl -

quanphat profile image

How to integrate Queue in an Express application

Le Quan Phat -

zand profile image

Building a High-Quality Stock Report Generator with Node.js, Express, and OpenAI API

Zane -

nigrosimone profile image

Enhancing JSON Serialization Performance in Express.js with express-fast-json-stringify

Nigro Simone -