Friday, July 29, 2022

Spring Boot 2.4.4, Kotlin 1.6, Basic Auth, JWT and LDAP


In this post. I will share a basic example,  how to integrate Spring Boot , Kotlin , Basic Auth, JWT and LDAP. However since Spring Security 5 the oauth2 is deprecated so I suggest to use Open Source Identity, Keycloak, OpenIAM, CAS  etc. Or We will wait for new version Spring 6 in Nov 2022  this version will come available Spring Authorization Server 1.0. 

Basic Auth 

Basic Authentication is a Method HTTP where we provide the username and password to the people making requests.

JSON Web Token

JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object.

LDAP 

I this example used test-server.ldif LDIF  file provide by Spring.


Creating a Spring Boot Application


In this examples we're integration Spring Boot, Kotlin, Basic Auth and Ldap .ldif file.


Spring Boot Rest  API 

This is API

Methods URLs
POST /oauth/token
GET /principal
GET /users

Technology

  • Spring Boot 2.4.4
  • Kotlin 1.6.21
  • JWT
  • OAuth2
  • Java 17 (Zulu)
  • Maven 
  • IntelliJ IDEA 
  • test-server.ldif

Project Structure





















Configuration Spring Boot project 


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>2.4.4</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>com.henry</groupId>
   <artifactId>SpringBoot2KotlinBasicAuthJWTLdap</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>SpringBoot2KotlinBasicAuthJWTLdap</name>
   <description>Spring Boot 2 + Kotlin + Basic Auth + JWT + LDAP</description>
   <properties>
      <java.version>17</java.version>
      <kotlin.version>1.6.21</kotlin.version>
   </properties>
   <dependencies>

      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-security</artifactId>
      </dependency>
      <!-- https://mvnrepository.com/artifact/org.springframework.ldap/spring-ldap-core -->
      <dependency>
         <groupId>org.springframework.ldap</groupId>
         <artifactId>spring-ldap-core</artifactId>
         <version>2.4.1</version>
      </dependency>

      <dependency>
         <groupId>org.springframework.security</groupId>
         <artifactId>spring-security-ldap</artifactId>
      </dependency>
      <dependency>
         <groupId>com.unboundid</groupId>
         <artifactId>unboundid-ldapsdk</artifactId>
      </dependency>
      <!-- oauth2 -->
      <dependency>
         <groupId>org.springframework.security.oauth</groupId>
         <artifactId>spring-security-oauth2</artifactId>
         <version>2.3.5.RELEASE</version>
      </dependency>
      <!-- jwt -->
      <dependency>
         <groupId>org.springframework.security</groupId>
         <artifactId>spring-security-jwt</artifactId>
         <version>1.0.10.RELEASE</version>
      </dependency>
      <dependency>
         <groupId>org.apache.directory.server</groupId>
         <artifactId>apacheds-server-jndi</artifactId>
         <version>1.5.5</version>
      </dependency>

      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-tomcat</artifactId>
         <!--<scope>provided</scope>-->
      </dependency>

      <dependency>
         <groupId>com.sun.xml.bind</groupId>
         <artifactId>jaxb-core</artifactId>
         <version>4.0.0</version>
      </dependency>
      <dependency>
         <groupId>javax.xml.bind</groupId>
         <artifactId>jaxb-api</artifactId>
         <version>2.4.0-b180830.0359</version>
      </dependency>
      <dependency>
         <groupId>com.sun.xml.bind</groupId>
         <artifactId>jaxb-impl</artifactId>
         <version>2.3.1</version>
      </dependency>

      <dependency>
         <groupId>com.fasterxml.jackson.module</groupId>
         <artifactId>jackson-module-kotlin</artifactId>
      </dependency>
      <dependency>
         <groupId>org.jetbrains.kotlin</groupId>
         <artifactId>kotlin-reflect</artifactId>
      </dependency>
      <dependency>
         <groupId>org.jetbrains.kotlin</groupId>
         <artifactId>kotlin-stdlib-jdk8</artifactId>
      </dependency>

      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-test</artifactId>
         <scope>test</scope>
      </dependency>
   </dependencies>

   <build>
      <sourceDirectory>${project.basedir}/src/main/kotlin</sourceDirectory>
      <testSourceDirectory>${project.basedir}/src/test/kotlin</testSourceDirectory>
      <plugins>
         <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
         </plugin>
         <plugin>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-maven-plugin</artifactId>
            <configuration>
               <args>
                  <arg>-Xjsr305=strict</arg>
               </args>
               <compilerPlugins>
                  <plugin>spring</plugin>
               </compilerPlugins>
            </configuration>
            <dependencies>
               <dependency>
                  <groupId>org.jetbrains.kotlin</groupId>
                  <artifactId>kotlin-maven-allopen</artifactId>
                  <version>${kotlin.version}</version>
               </dependency>
            </dependencies>
         </plugin>
      </plugins>
   </build>

</project>


application.yml


server:
    port: 9000
    servlet:
      context-path: /
        
spring:
    ldap:
     embedded:
      base-dn: dc=springframework,dc=org
      ldif: classpath:test-server.ldif
      port: 8389
      url: ldap://localhost:8389/


Package Security configuration


AuthorizationServerConfig.java 

client: henry and secret: secret and authorization grant password and refresh_token, here is official documentation provided by Spring.

package com.henry.configuration

import org.springframework.beans.factory.annotation.Autowired
import org.springframework.beans.factory.annotation.Qualifier
import org.springframework.context.annotation.Bean
import org.springframework.context.annotation.Configuration
import org.springframework.security.authentication.AuthenticationManager
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder
import org.springframework.security.oauth2.config.annotation.configurers.ClientDetailsServiceConfigurer
import org.springframework.security.oauth2.config.annotation.web.configuration.AuthorizationServerConfigurerAdapter
import org.springframework.security.oauth2.config.annotation.web.configuration.EnableAuthorizationServer
import org.springframework.security.oauth2.config.annotation.web.configurers.AuthorizationServerEndpointsConfigurer
import org.springframework.security.oauth2.config.annotation.web.configurers.AuthorizationServerSecurityConfigurer
import org.springframework.security.oauth2.provider.token.store.JwtAccessTokenConverter
import org.springframework.security.oauth2.provider.token.store.JwtTokenStore


@Configuration
@EnableAuthorizationServer
class AuthorizationServerConfig : AuthorizationServerConfigurerAdapter() {
    @Autowired
    @Qualifier("authenticationManagerBean")
    private val authenticationManager: AuthenticationManager? = null

    @Autowired
    private val passwordEncoder: BCryptPasswordEncoder? = null

    @Throws(Exception::class)
    override fun configure(security: AuthorizationServerSecurityConfigurer) {
        security.tokenKeyAccess("permitAll()")
            .checkTokenAccess("isAuthenticated()")
    }

    @Throws(Exception::class)
    override fun configure(clients: ClientDetailsServiceConfigurer) {
        clients.inMemory().withClient("henry")
            .secret(passwordEncoder!!.encode("secret"))
            .scopes("read", "write")
            .authorizedGrantTypes("password", "refresh_token")
            .accessTokenValiditySeconds(3600)
            .accessTokenValiditySeconds(3600)
    }

    @Throws(Exception::class)
    override fun configure(endpoints: AuthorizationServerEndpointsConfigurer) {
        endpoints.authenticationManager(authenticationManager)
            .tokenStore(tokenStore())
            .accessTokenConverter(accessTokenConverter())
    }

    @Bean
    fun tokenStore(): JwtTokenStore {
        return JwtTokenStore(accessTokenConverter())
    }

    @Bean
    fun accessTokenConverter(): JwtAccessTokenConverter {
        val converter = JwtAccessTokenConverter()
        converter.setSigningKey("123")
        return converter
    }
}

ResourceServerConfig.java 

Configurate the cors configuration and more details here official documentation provided by Spring.

package com.henry.configuration

import org.springframework.context.annotation.Bean
import org.springframework.context.annotation.Configuration
import org.springframework.security.config.annotation.web.builders.HttpSecurity
import org.springframework.security.oauth2.config.annotation.web.configuration.EnableResourceServer
import org.springframework.security.oauth2.config.annotation.web.configuration.ResourceServerConfigurerAdapter
import org.springframework.web.cors.CorsConfiguration
import org.springframework.web.cors.CorsConfigurationSource
import org.springframework.web.cors.UrlBasedCorsConfigurationSource


@Configuration
@EnableResourceServer
class ResourceServerConfig : ResourceServerConfigurerAdapter() {
    @Throws(Exception::class)
    override fun configure(http: HttpSecurity) {
        http.cors().and().authorizeRequests().antMatchers("/webjars/**").permitAll().anyRequest().authenticated().and().cors()
            .configurationSource(corsConfigurationSource())
    }

    @Bean
    fun corsConfigurationSource(): CorsConfigurationSource {
        val config = CorsConfiguration()
        config.allowedOrigins = listOf("*")
        config.allowedMethods = listOf("GET", "POST", "PUT", "DELETE", "OPTIONS")
        config.allowCredentials = true
        config.allowedHeaders = listOf("Content-Type", "Authorization")
        val source = UrlBasedCorsConfigurationSource()
        source.registerCorsConfiguration("/**", config)
        return source
    }


}

SpringSecurityConfig.java

Configurate LDAP ldif file provided by Spring and stateless.

package com.henry.configuration

import org.springframework.beans.factory.annotation.Autowired
import org.springframework.context.annotation.Bean
import org.springframework.context.annotation.Configuration
import org.springframework.security.authentication.AuthenticationManager
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.config.annotation.web.configuration.WebSecurityConfigurerAdapter
import org.springframework.security.config.http.SessionCreationPolicy
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder
import org.springframework.security.oauth2.provider.ClientDetailsService
import org.springframework.security.oauth2.provider.approval.ApprovalStore
import org.springframework.security.oauth2.provider.approval.TokenApprovalStore
import org.springframework.security.oauth2.provider.approval.TokenStoreUserApprovalHandler
import org.springframework.security.oauth2.provider.request.DefaultOAuth2RequestFactory
import org.springframework.security.oauth2.provider.token.TokenStore


@Configuration
@EnableGlobalMethodSecurity(securedEnabled = true)
class SpringSecurityConfig : WebSecurityConfigurerAdapter() {
    @Autowired
    private val clientDetailsService: ClientDetailsService? = null

    @Bean
    @Throws(Exception::class)
    override fun authenticationManagerBean(): AuthenticationManager {
        return super.authenticationManagerBean()
    }

    @Throws(Exception::class)
    override fun configure(auth: AuthenticationManagerBuilder) {
        auth
            .ldapAuthentication()
            .userDnPatterns("uid={0},ou=people")
            .groupSearchBase("ou=groups")
            .contextSource()
            .url("ldap://localhost:8389/dc=springframework,dc=org")
            .and()
            .passwordCompare()
            .passwordEncoder(BCryptPasswordEncoder())
            .passwordAttribute("userPassword")
    }

    @Throws(Exception::class)
    override fun configure(http: HttpSecurity) {
        http
            .csrf().disable()
            .cors().disable()
            .authorizeRequests()
            .antMatchers("/oauth/**").permitAll()
            .anyRequest().authenticated()
            .and().httpBasic()
            .and().sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
    }

    @Bean
    @Autowired
    fun userApprovalHandler(tokenStore: TokenStore?): TokenStoreUserApprovalHandler {
        val handler = TokenStoreUserApprovalHandler()
        handler.setTokenStore(tokenStore)
        handler.setRequestFactory(DefaultOAuth2RequestFactory(clientDetailsService))
        handler.setClientDetailsService(clientDetailsService)
        return handler
    }

    @Bean
    @Autowired
    @Throws(Exception::class)
    fun approvalStore(tokenStore: TokenStore?): ApprovalStore {
        val store = TokenApprovalStore()
        store.setTokenStore(tokenStore)
        return store
    }

    @Bean
    fun passwordEncoder(): BCryptPasswordEncoder {
        return BCryptPasswordEncoder()
    }
}

Spring Rest APIs Controller


package com.henry.controller

import org.springframework.web.bind.annotation.GetMapping
import org.springframework.web.bind.annotation.RestController
import java.security.Principal
import java.util.*


@RestController
class DefaultRestController {
    @GetMapping("/principal")
    fun user(principal: Principal): Principal {
        return principal
    }

    @GetMapping("/users")
    fun hello(principal: Principal): Map<String, String>? {
        return Collections.singletonMap("response", "Hello ${principal.name}")
    }

}

Run & Test


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

Credentials for test:

Basic auth:
client: henry
secret: secret

LDAP by ldif file:
user: henry
password: 123


POSTMAN

Type: Basic Auth
Username: henry
Password: secret













Body: x-www-form-urlencoded
username: henry
password: 123
grant_type: password











Get access token

POST: http://localhost:9000/oauth/token


















When we have an access token then just add headers with  Authorization Bearer {token}

GET:

http://localhost:9000/principal

















GET:

http://localhost:9000/users

















Source Code


Here on GitHub.





References.

https://www.baeldung.com/keycloak-embedded-in-spring-boot-app
https://www.baeldung.com/spring-security-oauth-jwt
https://jwt.io/introduction
https://squareball.co/blog/the-difference-between-basic-auth-and-oauth
https://www.twilio.com/docs/glossary/what-is-basic-authentication











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