I set up login in web application with ADFS.
Authorization request looks like:
https://sso.company.net/adfs/oauth2/authorize?response_type=code&client_id=ruleman&resource=urn:ruleman:1&redirect_uri=http://ruleman.net/authorize
ADFS performs authorization and redirects to the app:
http://ruleman.net/authorize?code=aaaaaaaa.bbbbbbbbb.ccccccccc
One knows that the token from code parameter contains claims such as username etc. How to decode the token and extract the claims?
The Postman flow for this - refer Postman : Authorisation Code Grant on Server 2016 - ADFS 4.0.
This code grant is the flow you have described.
As per the other answers:
Use the authorize endpoint
Get the code
Send the code to the token endpoint
Get the JWT
Use jwt.io to examine the JWT.
The flow follows the OAuth 2.0 standard. Please note I am not expert in ADFS, however I know OAuth 2.0 well.
The authorization flow consists of multiple options with different steps. In your case you are using the code profile (specifying response_type=code). The authorization step you did is only first step, there are a few steps to follow
you can search on "OAuth 2.0 with ADFS" e.g. http://blog.scottlogic.com/2015/03/09/OAUTH2-Authentication-with-ADFS-3.0.html
Authorization request
../authorize?response_type=code&client_id=ruleman
&resource=urn:ruleman:1&redirect_uri=http://ruleman.net/authorize
you will receive an OAuth code (usually not aving any information value, it is only a code)
http://ruleman.net/authorize?code=aaaaaaaa.bbbbbbbbb.ccccccccc
code parameter contains claims such as username etc
This is wrong assumption
Using this code you need to call a token service from backend to receive an access token (e.g. using HttpClient).
POST /adfs/oauth2/token HTTP/1.1
grant_type=authorization_code&client_id=some-uid-or-
other&redirect_uri=http%3A%2F%2Flocalhost%3A3000%2FgetAToken&code=thecode
you will receive an access token. This step ensures you application is really authenticated with the identity provider it knows.
According to the post linked above:
The interesting bit is the itself, it is in fact a JSON Web Token (JWT). That’s to say a signed representation of the user’s identity and other grants.
I am unable to confirm that, but you can try. Usually (with other identity providers) the token is only a token and the client neeeds to call a "user information" service to get any user identity claims, however seems the ADFS gives you some shortcut.
Then you can use any JWT library to decode/validate the jwt token (com.auth0/java-jwt/3.0.1)
com.auth0.jwt.interfaces.DecodedJWT jwt = com.auth0.jwt.JWT.decode(token);
Related
My quarkus backend is calling a rest web service which requires an access token. The access token is generated using client id, client secret and grant type client credentials. The token is valid for a couple of days.
This quarkus backend then propagates the data to an angular frontend.
I have a couple of questions:
Is there an out of the box implementation from Quarkus framework?
If not, please guide me if I should use httpclient or any other library for getting the access token.
How to check for refresh token?
How to save the access token, so that it can be used for other requests by other users?
Otherwise I end up generating an access token every time a user calls the rest service.
Since there is no answer, I will write here how I implemented this:
I use a java.net.http.httpclient to call the oauth server for getting the token with the client id and secret.
I cache the token using quarkus-cache and when the token expires, the quarkus-cache is invalidated and rebuilt with the new token.
Suggestions or better solutions are welcome.
I have gone through multiple blog posts and StackOverflow questions before writing my own. I have multiple queries and none of the posts answer them.
I am using Keycloak Spring Security Adapter to secure my legacy Spring application. I referred to the keycloak documentation here and was able to have OAuth flow running for me. I am using Client Id and Secret as Client Authenticator.
For eg: Access to localhost:8080/about.htm will redirect me to keycloak login screen and after successful authentication, I will be able to view my page. I am also using the below code to read the user details from the token,
KeycloakPrincipal<KeycloakSecurityContext> kp = (KeycloakPrincipal<KeycloakSecurityContext>) auth.getPrincipal();
IDToken idToken = kp.getKeycloakSecurityContext().getIdToken();
user.setUsername(idToken.getPreferredUsername());
Now when I test this application using postman and modify the generated access token, obviously the server gives an error. Ref : How to test application using postman.
However, this is the flow :
Client sends a request to the resource server, resource server checks for a token - if it exists, the client does the validation. If it doesn’t exist or is invalid, it redirects to the authorization server (KC).
My question is,
Who is validating this token? How does postman flow throw an error
if I fiddle with the token?
Do I really need to write a JwtTokenValidator in my application for
each request? Won't that be overkill?
If I use Client Authenticator as Signed Jwt with client secret, will this validation still be required? I am not using it as it introduces latency.
Please assist.
Answer to #1:
When you use any Keycloak adapters in your application (in your case the Spring adapter for Keycloak), that's the one who does the validation and redirects to the login if necessary. As part of the validation, it checks the signature of the token issued by Keycloak. So when you fiddle with the token, the signature doesn't match, hence it throws an error.
Answer to #2
No, you shouldn't need to implement a JwtTokenValidator. The adapter does it for you and a request should reach your endpoint/URL only if it has a valid token. You may only need to do that if you have a special requirements about validating the token (e.g. checking specific claim in the token against some service). Otherwise, you can safely use the claims in the token you received from the KeycloakSecurityContext. You can even setup authorization based on your URL patterns and Keycloak will enforce them too and allow the request to pass if user has necessary roles (like this example).
Answer to #3:
That option only changes the method used to authenticate your app to the Keycloak and has nothing to do with the user's token validation inside your app. In your current setup, when your app wants to communicate with Keycloak (e.g. to exchange auth code with auth token), it authenticate itself to Keycloak with a client-id/client-secret pair (otherwise Keycloak would not know it's your app and will reject the request).
If you choose the "Signed Jwt with Client Secret" option, your client can not just use a client-secret to authenticate to Keycloak. It should support the RFC7523 specification. So it's quite complex in compare with a simple clien-secret approach. In an environment in which you trust your clients (e.g. they're all known apps developed inside the company and you're not going to support public clients to join your Keycloak and use its services) it's quite common and safe to use client-secret approach.
I'd like to authenticate a Rest service (RS) against a Keycloak server (KS).
RS is accessed via an application (APP) and not a browser for example.
So far, I've understood the way to proceed is as following:
APP is authenticating against KS and get an ACCESS_TOKEN.
APP is sending a request to the RS passing somehow the ACCESS_TOKEN.
RS is extracting the ACCESS_TOKEN and validate / decode it to get the required information associated with the user.
I've hard time finding the right JAVA API to perform the step (3).
So far, I've "verified" the token using a TokenVerifier (setup using the RSA public key of the KS) => TokenVerifier.verify(). Once verified, I'm parsing it to decode it using. So far so good.
One extra step I'd like to achieve is ensuring the ACCESS_TOKEN is still valid in KS. But I did not find any JAVA API for that purpose. So instead, I've issued a regular HTTP request to the UserInfo endpoint using the ACCESS_TOKEN.
So is there any JAVA API to check the validity of the ACCESS_TOKEN ?
Am I doing the thing right for this kind of scenario ?
You can either validate access token by calling the Introspection Endpoint or locally validate it by using auth0 library.
More information in keycloak docs
I have two Java Spring applications, one is working as client and other as server. Client is Spring RESTful service.
My requirement is:
Once a server wants to communicate with a client, it should send some token. The token will get validated by client. If the token is valid then client performs some task and sends success result. Otherwise the response will be like not valid token and client does not perform any task for that request.
I think what you need is JWT token, you can learn JWT token and java in JWT token, using the java lib to generate token and validate.
The way to transfer token is to add custom header in request header, so you can just add a filter to intercept the request and validate the token.
If you want use authority not just a simple token you can use spring security and JWT token, the demo and reference can see REST Security with JWT using Java and Spring Security and demo.
In my project,I using spring security+ spring session rest+ hazelcast,it's also a way to protect my rest api by token.
You can chose the method you need and if any question you can comment under the answer.
If I'm creating a web application with a RESTful back end, is OAuth 2.0 really necessary given that I don't want to connect with social media (Facebook, Google+, etc.)? I'm thinking about ditching OAuth2.0 and doing the following:
Generate JWT tokens upon successful login
Store this token in redis (or database, haven't decided)
Have a filter that checks for the JWT token and matches the token with the one in redis/db.
If the token exists, allow the user to access the resource
You can manually generate JWT tokens if you wish but it would be better to let an oAuth 2.0 implementation handle the JWT generation.
You don't need to persist the token. Just check the signed signature of the JWT, there is no need to check a database as the point of a JWT is for stateless authentication.
OAuth 2.0 3 legged flow is mainly used to address a third-party application to gain resource owner access without sharing resource owner's credentials with the third party application.For example, a photo print application wants to access resource owner's (user) flicker account on behalf of resource owner without sharing the resource owner flicker account credentials.
In the traditional client-server authentication, you may consider to use OAuth 2.0 2 legged resource owner grant where OAuth 2.0 client application can request OAuth 2.0 Server to create OAuth Access Token. In this case, you can use JWT Token for OAuth Access Token. This flow is almost you have mentioned but only standard OAuth 2.0 resource owner request and response. Please refer resource owner request and response details at https://www.rfc-editor.org/rfc/rfc6749#section-4.3.2. If you use standard 2 legged OAuth flow, then client and server integration will be easy and interoperable.
If you don't want to support terminate(revoke) token operation, then you don't need to store the token in the database or any other place. In this case, the token can be self-expired but not terminated.
Even if you have a requirement for terminate token, then don't store the entire token and just store token uuid (random id) and set the token uuid in one of JWT Token Claim.