TechNotes Central: Keycloak 17 , LDAP, Angular 14 And Spring Boot 2

Keycloak

Keycloak is an open source identity and access management for modern applications and services, no need to deal with storing users or authenticating users. it's all available out of the box.

The Documentation keycloak mentioned the following with respect LDAP and Active Directory: Keycloak comes with a built-in LDAP/AD provider. It is possible to federate multiple different LDAP servers in the same Keycloak realm. You can map LDAP user attributes into the Keycloak common user model. By default, it maps username, email, first name, and last name, but you are free to configure additional mappings.

OpenID Connect

OpenID Connect additional is a simple identity layer on top of the OAuth 2.0 protocol. It allows Clients to verify the identity of the End-User based on the authentication performed by an Authorization Server, as well as to obtain basic profile information about the End-User in an interoperable and REST-like manner.

[Image]. https://developers.redhat.com

Downloading and installing docker-test-openldap by Docker

For Install docker-test-openldap you just need the next command: it will check the users available on GitHub repository.

docker run --rm -p 10389:10389 -p 10636:10636 rroemhild/test-openldap

Test connection to LDAP on Apache Directory Studio

Downloading and installing keycloack by Docker

For Install keycloak by docker you just need the next command: I used version 17.0.1

docker run -p 8080:8080 -e KEYCLOAK_ADMIN=admin -e KEYCLOAK_ADMIN_PASSWORD=admin quay.io/keycloak/keycloak:17.0.1 start-dev

This will start Keycloak exposed on the local port 8080. It will also create an initial admin user with username admin and password admin.

Setting Up a keycloack server.

Open a browser http://localhost:8080 or http://127.0.0.1:8080 result this.

Creating a Realm

For default the console opens up Master realm, Let's navigate left corner Add realm button.

For this example I created realm demo. we'll click the button create.

Creating a Client

Add a new client with the name spring-boot-keycloak with openid-connect. click button save.

Add Valid Redirect URIs.

Add LDAP

Click on User Federation -> ldap:

Ldap Parameters:

Edit Mode: READ_ONLY

Vendor: Active Directory

LDAP attribute name for username: uid

RDN LDAP attribute: cn

UUID LDAP attribute: cn

User Object Classes: top, person, organizationalPerson, inetOrgPerson

Connection URL: ldap://YOUR_IP:10389

Users DN: ou=people,dc=planetexpress,dc=com

Search Scope: One level

Bind Type: none

Click and Save and Synchronize all user.

Go to Manage -> Users and check all users:

Creating a Spring Boot Application

In this examples we're integration Spring Boot, keycloack and Ldap user federation.

Configuration Spring boot, Spring Security and keycloack.
Spring Controllers

Spring Boot Rest API

This is API

Methods	URLs
GET	/users

Technology

Java 17 (Zulu)
Spring Boot 2.7.1
Maven
IntelliJ IDEA
Docker
Test-openldap

Project Structure

Configuration Spring Boot Keycloak project

Spring Initializr or Spring Suite Tool (STS).
Maven

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>2.7.1</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>com.henry</groupId>
   <artifactId>demo</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>demo</name>
   <description>Demo project for Spring Boot Keycloak, ldap</description>

   <properties>
      <java.version>17</java.version>
      <keycloak-adapter-bom.version>17.0.1</keycloak-adapter-bom.version>
   </properties>
   <dependencyManagement>
      <dependencies>
         <dependency>
            <groupId>org.keycloak.bom</groupId>
            <artifactId>keycloak-adapter-bom</artifactId>
            <version>${keycloak-adapter-bom.version}</version>
            <type>pom</type>
            <scope>import</scope>
         </dependency>
      </dependencies>
   </dependencyManagement>
   <dependencies>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter</artifactId>
      </dependency>
      <dependency>
         <groupId>org.keycloak</groupId>
         <artifactId>keycloak-spring-boot-starter</artifactId>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-data-jpa</artifactId>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-test</artifactId>
         <scope>test</scope>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-security</artifactId>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-web</artifactId>
         <exclusions>
            <!-- Exclude the Tomcat dependency -->
            <exclusion>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-starter-tomcat</artifactId>
            </exclusion>
         </exclusions>
      </dependency>
      <!-- Use Jetty instead -->
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-jetty</artifactId>
      </dependency>
      <dependency>
         <groupId>org.hsqldb</groupId>
         <artifactId>hsqldb</artifactId>
         <scope>runtime</scope>
      </dependency>
      
      <dependency>
         <groupId>org.springframework.security</groupId>
         <artifactId>spring-security-test</artifactId>
         <scope>test</scope>
      </dependency>
   </dependencies>

   <build>
      <plugins>
         <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <version>${project.parent.version}</version>
         </plugin>
      </plugins>
   </build>

</project>

application.yml

server:
  port: 8081
keycloak:
  auth-server-url: http://127.0.0.1:8080
  realm: demo
  resource: spring-boot-keycloak
  public-client: true
  bearer-only: true
  principal-attribute: preferred_username

Class Security configuration

I suggest to you, we 'll be reading Spring Boot Adapters, I got from Spring Boot Adapters the configuration class.

import org.keycloak.adapters.springboot.KeycloakSpringBootConfigResolver;
import org.keycloak.adapters.springsecurity.KeycloakConfiguration;
import org.keycloak.adapters.springsecurity.authentication.KeycloakAuthenticationProvider;
import org.keycloak.adapters.springsecurity.config.KeycloakWebSecurityConfigurerAdapter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Import;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.core.authority.mapping.SimpleAuthorityMapper;
import org.springframework.security.core.session.SessionRegistryImpl;
import org.springframework.security.web.authentication.session.RegisterSessionAuthenticationStrategy;
import org.springframework.security.web.authentication.session.SessionAuthenticationStrategy;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.CorsConfigurationSource;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;

@KeycloakConfiguration
@Import(KeycloakSpringBootConfigResolver.class)
@EnableGlobalMethodSecurity(jsr250Enabled = true)//so i need the roles exist environment, @RolesAllowed
public class SecurityConfig extends KeycloakWebSecurityConfigurerAdapter
{


    /**
     * Registers the KeycloakAuthenticationProvider with the authentication manager.
     */
    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {

        KeycloakAuthenticationProvider keycloakAuthenticationProvider = new KeycloakAuthenticationProvider();
        keycloakAuthenticationProvider.setGrantedAuthoritiesMapper(new SimpleAuthorityMapper());
        auth.authenticationProvider(keycloakAuthenticationProvider);
    }

    /**
     * Defines the session authentication strategy.
     */
    @Bean
    @Override
    protected SessionAuthenticationStrategy sessionAuthenticationStrategy() {
        return new RegisterSessionAuthenticationStrategy(new SessionRegistryImpl());
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception
    {
        super.configure(http);
        http.cors().and()
                .authorizeRequests()
                        .anyRequest().fullyAuthenticated();
        http.csrf().disable();

    }

    @Bean
    CorsConfigurationSource corsConfigurationSource() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", new CorsConfiguration().applyPermitDefaultValues());
        return source;
    }
}

Spring Rest APIs Controller

import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.Collections;
import java.util.Map;

@RestController

public class HelloWorldController {

    @GetMapping("/users")
    public Map<String, String> hello(){
        Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
        String currentPrincipalName = authentication.getName();
        return Collections.singletonMap("response", "Hello "+currentPrincipalName);

    }
}

Run & Test

Run Spring Boot application with command: mvn spring-boot:run. by console, IntelliJ etc.

Keycloak provides a REST API for generating and refreshing access tokens.

1. We need to acquire an access token from Keycloak from this url.

127.0.0.1 or localhost .
Port: 8080 .
realms Url defined by keycloak.
demo The name of realm.
protocol/openid-connect/token The url defined by keycloak.

http://127.0.0.1:8080/realms/demo/protocol/openid-connect/token

2. Configurate on Postman.

Without token:

GET: http://127.0.0.1:8081/users

With token:

Parameters:

GET: http://127.0.0.1:8081/users

Tab Authorizacion: for more users it will check of Test-openldap on GitHub.

Type: OAuth 2.0

Grant Type: Password Credentials

Access Token URL: http://127.0.0.1:8080/realms/demo/protocol/openid-connect/token

Client ID: spring-boot-keycloak

Username: zoidberg

Password: zoidberg

Client Authentication: Send client credentials in body

Click on Get New Acces token.

Click Proceed and next to Use Token.

Creating Angular Application

In this examples we're integration Angular, keycloack, Ldap user federation and Spring Boot.

Configuration Angular and keycloack.
Components
Services

Angular Rest API

This is API

Methods	URLs
GET	/users

Technology

Visual Studio Code 1.68.1
Node 16
Npm
Angular Cli 14
Angular Material 14
sweetalert2

Project Structure

Configuration Angular Keycloak project

Folder:

redirect: When the app is up always start in this component.

pages: provided title header in all pages and all components to configure routing file.

services: provided services, interceptors, guards, consuming web services etc.

environments: (environment.ts) provided the endpoints for keycloak and spring boot.

// This file can be replaced during build by using the `fileReplacements` array.

// `ng build` replaces `environment.ts` with `environment.prod.ts`.
// The list of file replacements can be found in `angular.json`.

export const environment = {
  production: false,
  keycloakEndpoint: "http://127.0.0.1:8080/realms/demo/protocol/openid-connect/token",
  wsEndpoint: "http://127.0.0.1:8081"
};

/*
 * For easier debugging in development mode, you can import the following file
 * to ignore zone related error stack frames such as `zone.run`, `zoneDelegate.invokeTask`.
 *
 * This import should be commented out in production mode because it will have a negative impact
 * on performance if an error is thrown.
 */
// import 'zone.js/plugins/zone-error';  // Included with Angular CLI.

Run & Test

Run Angular application with command: ng serve

Go to http://localhost:4200/

Set credentials for users from LDAP User federation from Keycloak.

username: zoidberg

password: zoidberg

Click on Login

If login is ok. Show the name from Keycloak and username from Spring Boot project.

Get and set values from login html (login.component.ts).

 const body = new HttpParams()
      .set("username", this.loginForm.value.username!)
      .set("password", this.loginForm.value.password!)
      .set("grant_type", "password")
      .set("client_id", "spring-boot-keycloak")
      .set("client_secret", "")
      .set("scope", "openid");

Call WS KeycloakEndopoint (auth.service.ts).

async currentloginid(payMod: any) {
    //changes this url by your realms 
    try {
      const response = await fetch(environment.keycloakEndpoint, {
        method: 'post',
        headers: {
          'Content-Type': 'application/x-www-form-urlencoded; charset=utf-8'
        },
        body: payMod
      });
      const data = await response.json();
      return data;
    } catch (error) {
      console.log('Request failed', error);
    }
  }

Call WS Endpoint Spring Boot Project (content.component.ts).

ngOnInit(): void {
    this.name = this.authService.getUser();
    let url = `${environment.wsEndpoint}/users`;
    this._client.getUserFromBackend(url).subscribe((data) => {
      this.username = data.response;
    });
  }

Go to inspect: Righ click on page -> Inspect or f12.

Tab -> Application -> Storage ->Session Storage

Show the token.

For will check if token is valid go to jwt.io and copy and paste token.

Source Code

Here on GitHub:

Backend

Frontend

References.

https://github.com/rroemhild/docker-test-openldap

https://jwt.io/

https://www.keycloak.org/getting-started/getting-started-docker

https://www.keycloak.org/

https://material.angular.io/guide/schematics

https://angular.io/

TechNotes Central

Tuesday, July 5, 2022

Keycloak 17 , LDAP, Angular 14 And Spring Boot 2

Keycloak

OpenID Connect

[Image]. https://developers.redhat.com

Downloading and installing docker-test-openldap by Docker

Downloading and installing keycloack by Docker

Setting Up a keycloack server.

Creating a Realm

Creating a Client

Add LDAP

Creating a Spring Boot Application

Spring Boot Rest API

Technology

Project Structure

Configuration Spring Boot Keycloak project

pom.xml

application.yml

Class Security configuration

Spring Rest APIs Controller

Run & Test

Creating Angular Application

Angular Rest API

Technology

Project Structure

Configuration Angular Keycloak project

Run & Test

Source Code

References.

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