Secure spring boot application with keycloak

In last blog post of this series we saw how we can configure keycloak for our application.
Now in this tutorial we
will see how we can use keycloak with spring boot.

Prerequisite

• Docker
• Keycloak

Version

• Spring Boo: 1.5.17.RELEASE
• Java: 1.8
• Keycloak: 4.0.5-Final

Create sample spring boot application

Dependencies

• Spring-boot-starter-web
• Keycloak-spring-boot-starter

Create rest controller class

Secure App with keycloak

Add maven dependency for keycloak and spring security

• spring-boot-starter-security
• keycloak-spring-boot-starter

Configure keycloak server url and realms details in application.properties file

Configure keycloak security settings in the application

Add the blow class to configure the keycloak

KeycloakSecurityConfigurer.class extends KeycloakWebSecurityConfigurerAdapter.class
that
provide convenient base class for creating a WebSecurityConfigurer instance secured by Keycloak.

GrantedAuthoritiesMapper is mapping interface which use to convert case of the role used in the keycloak from
lower case to uppercase.

KeycloakAuthenticationProvider perform authentication process.

NullAuthenticatedSessionStrategy since we are using rest full service so we can provide null authenticated
session strategy.

KeycloakConfigResolver use to tell keycloak to use spring boot configuration.
Instead
use the configuration from the spring boot configuration resolver.

keycloakAuthenticationProcessingFilterRegistrationBean, keycloakPreAuthActionsFilterRegistrationBean are used
avoid re-registration of the filter.

Add security in rest controller SecuredResoureces

Running application

start the application using

mvn spring-boot:run

Call the admin api without security token.

Get access token for admin role


Access admin api with access token


Access user api with access token will give error because user role required for access user service.


Get access token for user role


Access user service



You can get the source code from Bitbucket

Setup keycloak sercurity for spring boot application

Setup Realm and clients in keycloak

This blog is the second part of the series of security spring boot application with keycloak. In first part we install setup in keycloak with docker you can see first part here.

Version:

Keycloak: 4.5.0.Final

Pre-requisites

Keycloak should be installed in the

Create realm

A realm secures and manages security metadata for a set of users, applications, and registered oauth clients. Users can be created within a specific realm within the Administration console.
Click on Add realm button

Input the realm name

Once realm created you will see this screen

Create Client

We need 2 clients one is for bearer-only client for the application, and another one is public client to get the access token

Create Public client

Once public client is created you will see the below screen

Create Bearer only client and set the access type to beare-only

Add new Admin role for the application client

Create Admin Client

 Create User Client

Create User for the application

Create two user with role admin with and user.

 Create admin user

 Set password

Assign admin role to user vik-admin


Similarly create another user account vik-user with user role

Get access and refresh token

User below curl to get the access token

Response


In the next blog we will se how to secure spring boot application. You can see the blog here.