What is the best way to integrate my Spring Boot app with OAuth2? It already has login functionality with issuing a JWT token. What I want to achieve: perform login using OAuth2 and issue the same JWT to access my app.
What should I use:
Keycloak auth server + make my app a resource server
Write my own auth server using spring-security-oauth2-autoconfigure and spring-boot-starter-oauth2-client + make my app a resource server?
Any other approach you can suggest...
Maybe, this link can help you: https://stackshare.io/stackups/keycloak-vs-spring-security
It really depends on your scenario.
But, in my opinion, the first option has more advantages. The main one is the maintenance effort. With your own oauth server, you must maintain one more service. Keycloak is mature and open source, with many developers maintaining it.
Related
is possible create authorization server for PKCE authentication in current version of spring security?
I did research and I found out this authorization server project https://github.com/spring-projects-experimental/spring-authorization-server but there is no usable sample for that project.
I also find out that spring recommends Keycloak as authorization server, but it is not fit for my case.
We need be able fetch and verify user against remote service, and then use authorization server only for generating and verifying jwt tokens. In my knowledge Keycloak should holds also users right? So the best solution would be custom spring standalone authorization server. Is it possible in some way? Thank you!
You may have a look to this project: CloudFoundry User Account and Authentication (UAA) Server.
UAA is a (Spring MVC) component of Cloud Foundry but it could be used as a stand alone OAuth2 server. It can support external authentication service. And there is a Pull Request that implements PKCE: https://github.com/cloudfoundry/uaa/pull/939 (not yet merged, but under review).
You can find an example on how to use UAA on baeldung.com.
As far as I know, Spring framework has one more implementation of the authorization server. It is a part of spring-security-oauth project. But this project was moved into maintenance mode.
According to this migration guide, the new authorization server project (that you have already found) will be created to change the legacy solution.
From my point of view now there are several possible options:
Using old legacy spring-security-oauth. More examples with old auth server
Using external services like Keycloak, Auth0, Okta and etc
I've written a software system that uses Spring Cloud Netflix. Due to Spring Security 5 not offering support for writing an Authorization Server (pls shout out here https://github.com/spring-projects/spring-security/issues/6320) I need to write my own Authorization server. I want my application to permit Social login and username/password registration, have a custom login page but also use keycloack. I don't even know from where to start, if you have any documentations or code samples please provide.
You can use the cas project. By using the overlay it is easy to set up and to customize:
https://github.com/apereo/cas-overlay-template/blob/master/README.md
It serves a frontend where your user can be redirected to and can login. After successful login, the user is redirected back to your web page. The frontend is completely customizable.
It supports all kinda of authentication providers like keycloak, database or Google/Facebook.
After basic setup you just add the dependency inside the gradle file, configure your keycloak/database/... in the application.properties and can start using it as authentication server.
It fits perfect into a microservice landscape and is curated by professionals implementing security best practice.
https://apereo.github.io/cas/6.1.x/planning/Getting-Started.html
I'm just wrapping my head on Oauth2. I have a Spring boot app with its own users and roles system handled by Spring Security 5. Internally I use email to identify users, I want people who registered with their gmail addresses to be able to log in through Oauth2. Or, more generally, how do I make one of my users log in to my app using Oauth2? If you need code or more information just ask. Thanks in advance.
As far as I understood your question, you are looking for a general approach to authenticate users for using your Spring Boot application with the help of OAuth2 protocol.
In your case you will probably use Google as an authentication provider and your application as resource server, according to the OAuth2 standard wording. First at all to answer your general question, there are different ways of using OAuth2 to authenticate users. A good starting points are these links:
https://www.rfc-editor.org/rfc/rfc6749
https://auth0.com
To find the proper way of implementing OAuth2 for your usecase I recommend using this decision tree: https://auth0.com/docs/api-auth/which-oauth-flow-to-use
For starting to implement OAuth2 in Spring Boot you can use several Spring Security projects with further documentation:
https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-security.html#boot-features-security-oauth2
https://docs.spring.io/spring-security-oauth2-boot/docs/current-SNAPSHOT/reference/htmlsingle/
I can build REST services with spring-security-oauth2
I can build website security with spring-security
And as you know, oauth2 has oauth-server, resource and client side. But I cannot put them together. I want to know how to build oauth2 website that I can login(session) with browser and I can use it as secure REST services(with access token). Any help? Thanks very much.
I'm not expert in Spring, but Spring security examples link has some examples how to implement OAuth2.0 servers and resource servers.
I've read about Oauth2 few days before, it has entities like Client, Resource Owner, Resource Server, Authorization Server and i understood the explanations too. but i don't understand the grant type's completely still i got confusion on following types. Oauth2 has 4 different grant types like,
Authorization code
Implict
Resource Owner Password Credentials
Client Credentials
please, give me some real time examples for the above types to differentiate the implementation. I need to know that what are the types of grant implementation spring security oauth2 has and full flow for spring oauth2 with security.
I have gone through some example implemented with oauth2 with spring mvc, spring security. but it's confusing me i don't get clear picture of the api implementation.
I'm looking for good Oauth2 flow and document with Spring mvc and Spring security. please help me.
In terms of understanding the flows and the differences between them, this presentation is the best resource I found online. After this, if you read the OAuth2 spec description, it'll be much easier to follow.
Unfortunately, in terms of code samples, there isn't good Spring Security OAuth2 sample code out there (the Sparklr and Tonr examples are okay but not super clear). Best resource there is to look at unit tests in Spring Security OAuth2 code on github.
One question I want to ask is - are you looking to create your own OAuth2 Provider or do you just want to connect to Facebook, Google, etc as OAuth2 client. If it's the second part, I would suggest skipping Spring Security OAuth2 and instead look at Spring Social project.
Edit:
For creating an OAuth2 Provider, check out this code by Dave Syer (he is the lead of Spring Security OAuth project) . It shows how you can create an OAuth2 Provider and Resource Server in 20 lines of code. This is the easiest way to create Spring Security OAuth code.
https://github.com/dsyer/sparklr-boot
It uses Spring Boot and Spring Security OAuth projects. Of course, you'll have to understand Spring Security, JavaConfig configuration and the OAuth2 protocol properly to understand how all of this works.
Authorization Code is redirection based flow, in most application when we login via Facebook or google we use this grant type.
Implicit is used mostly in mobile or single page application, Client confidentiality is not guaranteed here. This also has a redirect flow similar to Authorization Code. This does not support refresh token.
Password Grant Type is used when client application and resource owner belong to same application, this is goin to be case when your application is end to end working. Here we are sharing username and password. unlike the above two where we authenticate via Facebook or google.
Client Credentials: its a way to access it own service. like one microservice to access another microservice.
I also got into OAuth2 using spring last month.
I've read most of the OAuth2 spec and used the samples from the spring-security source, which are wonderful. That way I got a running application which I could use to play with and view it's sources next the the specs.