Differences between revisions 7 and 40 (spanning 33 versions)

jwt (JSON Web Token)

JSON Web Token

Overview

In authentication, when the user successfully logs in using their credentials, a JSON Web Token will be returned and must be saved locally (typically in local or session storage, but cookies can also be used), instead of the traditional approach of creating a session in the server and returning a cookie.

The tokens are designed to be compact,[2] URL-safe,[3] and usable especially in a web-browser single-sign-on (SSO) context. JWT claims can be typically used to pass identity of authenticated users between an identity provider and a service provider, or any other type of claims as required by business processes.

This is a stateless authentication mechanism as the user state is never saved in server memory. The server's protected routes will check for a valid JWT in the Authorization header, and if it is present, the user will be allowed to access protected resources. As JWTs are self-contained, all the necessary information is there, reducing the need to query the database multiple times.

Adapted tutorials point Spring boot + JWT example + OAuth2

https://www.tutorialspoint.com/spring_boot/spring_boot_oauth2_with_jwt.htm

The example in the tutorial doesn't run out of the box. It doesn't explain how to load the private key (PEM). Also it relies on Java 8. If we try to use the example with Java 11 it doesn't work due to issues with xml bind.

Structure

.
├── build_image.sh
├── connect_container.sh
├── Dockerfile
├── get_token.sh
├── jwt.pem
├── pom.xml
├── run_container.sh
├── src
│   └── main
│       ├── java
│       │   └── com
│       │       └── tutorialspoint
│       │           └── websecurityapp
│       │               ├── AnonymousController.java
│       │               ├── CustomDetailsService.java
│       │               ├── CustomUser.java
│       │               ├── OAuth2Config.java
│       │               ├── OAuthDao.java
│       │               ├── SecurityConfiguration.java
│       │               ├── UserEntity.java
│       │               └── WebsecurityappApplication.java
│       └── resources
│           ├── application.properties
│           ├── data.sql
│           └── schema.sql
└── stop_container.sh

mkdir -p src/main/java/com/tutorialspoint/websecurityapp/
mkdir src/main/resources/
openssl genrsa -out jwt.pem 2048 # generate private key

run_container.sh

   1 docker run -d -p 8080:8080 --name test test_image

Dockerfile

   1 FROM openjdk:8-alpine
   2 RUN apk add maven
   3 RUN mkdir -p /usr/src/tutpoint-jwt
   4 COPY . /usr/src/tutpoint-jwt
   5 WORKDIR /usr/src/tutpoint-jwt
   6 RUN mvn clean install
   7 CMD ["java","-jar","target/websecurityapp-0.0.1-SNAPSHOT.jar"]

src/main/java/com/tutorialspoint/websecurityapp/SecurityConfiguration.java

   1 package com.tutorialspoint.websecurityapp;
   2 
   3 import org.springframework.beans.factory.annotation.Autowired;
   4 import org.springframework.context.annotation.Bean;
   5 import org.springframework.context.annotation.Configuration;
   6 
   7 import org.springframework.security.authentication.AuthenticationManager;
   8 import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
   9 import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
  10 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
  11 import org.springframework.security.config.annotation.web.builders.WebSecurity;
  12 import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
  13 import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
  14 import org.springframework.security.config.http.SessionCreationPolicy;
  15 import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
  16 import org.springframework.security.crypto.password.PasswordEncoder;
  17 
  18 @Configuration
  19 @EnableWebSecurity
  20 @EnableGlobalMethodSecurity(prePostEnabled = true)
  21 public class SecurityConfiguration extends WebSecurityConfigurerAdapter {
  22         @Autowired
  23         private CustomDetailsService customDetailsService;
  24 
  25         @Bean
  26         public PasswordEncoder encoder() {
  27                 return new BCryptPasswordEncoder();
  28         }
  29 
  30         @Override
  31         @Autowired
  32         protected void configure(AuthenticationManagerBuilder auth) throws Exception {
  33                 auth.userDetailsService(customDetailsService).passwordEncoder(encoder());
  34         }
  35 
  36         @Override
  37         protected void configure(HttpSecurity http) throws Exception {
  38                 http.authorizeRequests().anyRequest().authenticated().and().sessionManagement()
  39                                 .sessionCreationPolicy(SessionCreationPolicy.NEVER);
  40 
  41         }
  42 
  43         @Override
  44         public void configure(WebSecurity web) throws Exception {
  45                 web.ignoring().antMatchers("/anonymous/**", "/resources/**", "/static/**");
  46         }
  47 
  48         @Override
  49         @Bean
  50         public AuthenticationManager authenticationManagerBean() throws Exception {
  51                 return super.authenticationManagerBean();
  52         }
  53 }

src/main/java/com/tutorialspoint/websecurityapp/OAuth2Config.java

   1 package com.tutorialspoint.websecurityapp;
   2 
   3 import org.springframework.beans.factory.annotation.Autowired;
   4 import org.springframework.beans.factory.annotation.Qualifier;
   5 import org.springframework.context.annotation.Bean;
   6 import org.springframework.context.annotation.Configuration;
   7 
   8 import org.springframework.security.authentication.AuthenticationManager;
   9 import org.springframework.security.oauth2.config.annotation.configurers.ClientDetailsServiceConfigurer;
  10 import org.springframework.security.oauth2.config.annotation.web.configuration.AuthorizationServerConfigurerAdapter;
  11 import org.springframework.security.oauth2.config.annotation.web.configurers.AuthorizationServerEndpointsConfigurer;
  12 import org.springframework.security.oauth2.config.annotation.web.configurers.AuthorizationServerSecurityConfigurer;
  13 import org.springframework.security.oauth2.provider.token.store.JwtAccessTokenConverter;
  14 import org.springframework.security.oauth2.provider.token.store.JwtTokenStore;
  15 
  16 import java.io.FileReader;
  17 import java.io.BufferedReader;
  18 
  19 @Configuration
  20 public class OAuth2Config extends AuthorizationServerConfigurerAdapter {
  21         private String clientid = "tutorialspoint";
  22         private String clientSecret = "my-secret-key";
  23 
  24         @Autowired
  25         @Qualifier("authenticationManagerBean")
  26         private AuthenticationManager authenticationManager;
  27 
  28         private String getFileContent(String filename) {
  29                 String ret = "";
  30                 BufferedReader bufReader = null;
  31                 try {
  32                         bufReader = new BufferedReader(new FileReader(filename));
  33                         String line = "";
  34                         while (line != null) {
  35                                 line = bufReader.readLine();
  36                                 if (line != null) {
  37                                         ret += line;
  38                                 }
  39                         }
  40                         bufReader.close();
  41                 } catch (Exception ex) {
  42                 } finally {
  43                 }
  44 
  45                 return ret;
  46         }
  47 
  48         @Bean
  49         public JwtAccessTokenConverter tokenEnhancer() {
  50 
  51                 JwtAccessTokenConverter converter = new JwtAccessTokenConverter();
  52                 String pemData = getFileContent("jwt.pem");
  53                 converter.setSigningKey(pemData);
  54                 converter.setVerifierKey(pemData);
  55                 return converter;
  56         }
  57 
  58         @Bean
  59         public JwtTokenStore tokenStore() {
  60                 return new JwtTokenStore(tokenEnhancer());
  61         }
  62 
  63         @Override
  64         public void configure(AuthorizationServerEndpointsConfigurer endpoints) throws Exception {
  65                 endpoints.authenticationManager(authenticationManager).tokenStore(tokenStore())
  66                                 .accessTokenConverter(tokenEnhancer());
  67         }
  68 
  69         @Override
  70         public void configure(AuthorizationServerSecurityConfigurer security) throws Exception {
  71                 security.tokenKeyAccess("permitAll()").checkTokenAccess("isAuthenticated()");
  72         }
  73 
  74         @Override
  75         public void configure(ClientDetailsServiceConfigurer clients) throws Exception {
  76                 clients.inMemory().withClient(clientid).secret(clientSecret).scopes("read", "write")
  77                                 .authorizedGrantTypes("password", "refresh_token").accessTokenValiditySeconds(20000)
  78                                 .refreshTokenValiditySeconds(20000);
  79 
  80         }
  81 }

src/main/java/com/tutorialspoint/websecurityapp/CustomUser.java

   1 package com.tutorialspoint.websecurityapp;
   2 
   3 import org.springframework.security.core.userdetails.User;
   4 
   5 public class CustomUser extends User {
   6    private static final long serialVersionUID = 1L;
   7    public CustomUser(UserEntity user) {
   8       super(user.getUsername(), user.getPassword(), user.getGrantedAuthoritiesList());
   9    }
  10 }

src/main/java/com/tutorialspoint/websecurityapp/UserEntity.java

   1 package com.tutorialspoint.websecurityapp;
   2 
   3 import java.util.ArrayList;
   4 import java.util.Collection;
   5 import org.springframework.security.core.GrantedAuthority;
   6 
   7 public class UserEntity {
   8         private String username;
   9         private String password;
  10         private String role;
  11         private Collection<GrantedAuthority> grantedAuthoritiesList = new ArrayList<>();
  12 
  13         public String getPassword() {
  14                 return password;
  15         }
  16 
  17         public void setPassword(String password) {
  18                 this.password = password;
  19         }
  20 
  21         public Collection<GrantedAuthority> getGrantedAuthoritiesList() {
  22                 return grantedAuthoritiesList;
  23         }
  24 
  25         public void setGrantedAuthoritiesList(Collection<GrantedAuthority> grantedAuthoritiesList) {
  26                 this.grantedAuthoritiesList = grantedAuthoritiesList;
  27         }
  28 
  29         public String getUsername() {
  30                 return username;
  31         }
  32 
  33         public void setUsername(String username) {
  34                 this.username = username;
  35         }
  36 
  37         public String getRole() {
  38                 return role;
  39         }
  40 
  41         public void setRole(String role) {
  42                 this.role = role;
  43         }
  44 
  45 }

src/main/java/com/tutorialspoint/websecurityapp/AnonymousController.java

   1 package com.tutorialspoint.websecurityapp;
   2 
   3 import org.springframework.stereotype.Controller;
   4 import org.springframework.web.bind.annotation.RequestMapping;
   5 import org.springframework.web.bind.annotation.ResponseBody;
   6 
   7 @Controller
   8 @RequestMapping("/anonymous")
   9 public class AnonymousController {
  10 
  11         @ResponseBody
  12         @RequestMapping(value = "/dummy", produces = "application/json")
  13         // http://localhost:8080/anonymous/dummy
  14         public String getDummy() {
  15                 return "dummy";
  16         }
  17 
  18 }

src/main/java/com/tutorialspoint/websecurityapp/WebsecurityappApplication.java

   1 package com.tutorialspoint.websecurityapp;
   2 
   3 import org.springframework.boot.SpringApplication;
   4 import org.springframework.boot.autoconfigure.SpringBootApplication;
   5 import org.springframework.security.access.prepost.PreAuthorize;
   6 import org.springframework.security.oauth2.config.annotation.web.configuration.EnableAuthorizationServer;
   7 import org.springframework.security.oauth2.config.annotation.web.configuration.EnableResourceServer;
   8 import org.springframework.web.bind.annotation.RequestMapping;
   9 import org.springframework.web.bind.annotation.RestController;
  10 
  11 @SpringBootApplication
  12 @EnableAuthorizationServer
  13 @EnableResourceServer
  14 @RestController
  15 public class WebsecurityappApplication {
  16         public static void main(String[] args) {
  17                 SpringApplication.run(WebsecurityappApplication.class, args);
  18         }
  19 
  20         @PreAuthorize("hasRole('ROLE_ADMIN')")
  21         @RequestMapping(value = "/products")
  22         public String getProductName() {
  23                 return "Honey";
  24         }
  25 
  26         @PreAuthorize("hasRole('ROLE_USER')")
  27         @RequestMapping(value = "/productsuser")
  28         public String getProductNameUsers() {
  29                 return "HoneyUser";
  30         }
  31 
  32 }

src/main/java/com/tutorialspoint/websecurityapp/CustomDetailsService.java

   1 package com.tutorialspoint.websecurityapp;
   2 
   3 import org.springframework.beans.factory.annotation.Autowired;
   4 import org.springframework.security.core.userdetails.UserDetailsService;
   5 import org.springframework.security.core.userdetails.UsernameNotFoundException;
   6 import org.springframework.stereotype.Service;
   7 
   8 @Service
   9 public class CustomDetailsService implements UserDetailsService {
  10    @Autowired
  11    OAuthDao oauthDao;
  12 
  13    @Override
  14    public CustomUser loadUserByUsername(final String username) throws UsernameNotFoundException {
  15       UserEntity userEntity = null;
  16       try {
  17          userEntity = oauthDao.getUserDetails(username);
  18          CustomUser customUser = new CustomUser(userEntity);
  19          return customUser;
  20       } catch (Exception e) {
  21          e.printStackTrace();
  22          throw new UsernameNotFoundException("User " + username + " was not found in the database");
  23       }
  24    }
  25 }

src/main/java/com/tutorialspoint/websecurityapp/OAuthDao.java

   1 package com.tutorialspoint.websecurityapp;
   2 
   3 import java.sql.ResultSet;
   4 import java.util.ArrayList;
   5 import java.util.Collection;
   6 import java.util.List;
   7 
   8 import org.springframework.beans.factory.annotation.Autowired;
   9 import org.springframework.jdbc.core.JdbcTemplate;
  10 import org.springframework.security.core.GrantedAuthority;
  11 import org.springframework.security.core.authority.SimpleGrantedAuthority;
  12 import org.springframework.stereotype.Repository;
  13 
  14 @Repository
  15 public class OAuthDao {
  16         @Autowired
  17         private JdbcTemplate jdbcTemplate;
  18 
  19         public UserEntity getUserDetails(String username) {
  20 
  21                 String userSQLQuery = "SELECT * FROM USERS WHERE USERNAME=?";
  22                 List<UserEntity> list = jdbcTemplate.query(userSQLQuery, new String[] { username },
  23                                 (ResultSet resultSet, int rowNum) -> {
  24 
  25                                         UserEntity user = new UserEntity();
  26                                         user.setUsername(username);
  27                                         user.setPassword(resultSet.getString("PASSWORD"));
  28                                         user.setRole(resultSet.getString("ROLE"));
  29                                         return user;
  30                                 });
  31                 
  32                 if (list.size() > 0) {
  33                         Collection<GrantedAuthority> grantedAuthoritiesList = new ArrayList<>();
  34                         UserEntity user = list.get(0);
  35                         GrantedAuthority grantedAuthority = new SimpleGrantedAuthority(user.getRole());
  36                         grantedAuthoritiesList.add(grantedAuthority);
  37                         user.setGrantedAuthoritiesList(grantedAuthoritiesList);
  38                         return user;
  39                 }
  40                 
  41                 return null;
  42         }
  43 }

src/main/resources/schema.sql

   1 CREATE TABLE USERS (ID INT PRIMARY KEY, USERNAME VARCHAR(45), PASSWORD VARCHAR(60), ROLE VARCHAR(60) );

src/main/resources/application.properties

security.oauth2.resource.filter-order=3 
logging.file=/tmp/testout.log

src/main/resources/data.sql

   1 INSERT INTO USERS (ID, USERNAME,PASSWORD, ROLE) VALUES (
   2    1, 'tutorialspoint@gmail.com','$2a$08$fL7u5xcvsZl78su29x1ti.dxI.9rYO8t0q5wk2ROJ.1cdR53bmaVG','ROLE_ADMIN');
   3 
   4 INSERT INTO USERS (ID, USERNAME,PASSWORD, ROLE) VALUES (
   5    2, 'myemail@gmail.com','$2a$08$fL7u5xcvsZl78su29x1ti.dxI.9rYO8t0q5wk2ROJ.1cdR53bmaVG','ROLE_USER');

build_image.sh

   1 docker build -t test_image .

pom.xml

   1 <?xml version = "1.0" encoding = "UTF-8"?>
   2 <project xmlns="http://maven.apache.org/POM/4.0.0"
   3         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   4         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
   5    http://maven.apache.org/xsd/maven-4.0.0.xsd">
   6 
   7         <modelVersion>4.0.0</modelVersion>
   8         <groupId>com.tutorialspoint</groupId>
   9         <artifactId>websecurityapp</artifactId>
  10         <version>0.0.1-SNAPSHOT</version>
  11         <packaging>jar</packaging>
  12         <name>websecurityapp</name>
  13         <description>Demo project for Spring Boot</description>
  14 
  15         <parent>
  16                 <groupId>org.springframework.boot</groupId>
  17                 <artifactId>spring-boot-starter-parent</artifactId>
  18                 <version>1.5.9.RELEASE</version>
  19                 <relativePath /> <!-- lookup parent from repository -->
  20         </parent>
  21 
  22         <properties>
  23                 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  24                 <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
  25                 <java.version>1.8</java.version>
  26         </properties>
  27 
  28         <dependencies>
  29                 <!--  Caused by: java.lang.ClassNotFoundException: javax.xml.bind.JAXBException  -->
  30                 <!-- API, java.xml.bind module -->
  31                 <dependency>
  32                         <groupId>jakarta.xml.bind</groupId>
  33                         <artifactId>jakarta.xml.bind-api</artifactId>
  34                         <version>2.3.2</version>
  35                 </dependency>
  36 
  37                 <!-- Runtime, com.sun.xml.bind module -->
  38                 <dependency>
  39                         <groupId>org.glassfish.jaxb</groupId>
  40                         <artifactId>jaxb-runtime</artifactId>
  41                         <version>2.3.2</version>
  42                 </dependency>
  43                 <dependency>
  44                         <groupId>org.springframework.boot</groupId>
  45                         <artifactId>spring-boot-starter-jdbc</artifactId>
  46                 </dependency>
  47 
  48                 <dependency>
  49                         <groupId>org.springframework.boot</groupId>
  50                         <artifactId>spring-boot-starter-security</artifactId>
  51                 </dependency>
  52 
  53                 <dependency>
  54                         <groupId>org.springframework.boot</groupId>
  55                         <artifactId>spring-boot-starter-web</artifactId>
  56                 </dependency>
  57 
  58                 <dependency>
  59                         <groupId>org.springframework.security.oauth</groupId>
  60                         <artifactId>spring-security-oauth2</artifactId>
  61                 </dependency>
  62 
  63                 <dependency>
  64                         <groupId>org.springframework.security</groupId>
  65                         <artifactId>spring-security-jwt</artifactId>
  66                 </dependency>
  67 
  68                 <dependency>
  69                         <groupId>com.h2database</groupId>
  70                         <artifactId>h2</artifactId>
  71                 </dependency>
  72 
  73                 <dependency>
  74                         <groupId>org.springframework.boot</groupId>
  75                         <artifactId>spring-boot-starter-test</artifactId>
  76                         <scope>test</scope>
  77                 </dependency>
  78 
  79                 <dependency>
  80                         <groupId>org.springframework.security</groupId>
  81                         <artifactId>spring-security-test</artifactId>
  82                         <scope>test</scope>
  83                 </dependency>
  84         </dependencies>
  85 
  86         <build>
  87                 <plugins>
  88                         <plugin>
  89                                 <groupId>org.springframework.boot</groupId>
  90                                 <artifactId>spring-boot-maven-plugin</artifactId>
  91                         </plugin>
  92                 </plugins>
  93         </build>
  94 
  95 </project>

get_token.sh

   1 ACCESS_TOKEN=$(curl -X POST --url http://localhost:8080/oauth/token --user tutorialspoint:my-secret-key --data 'grant_type=password&username=myemail@gmail.com&password=password' | jq -r '.access_token')
   2 ACCESS_TOKEN_ADMIN=$(curl -X POST --url http://localhost:8080/oauth/token --user tutorialspoint:my-secret-key --data 'grant_type=password&username=tutorialspoint@gmail.com&password=password' | jq -r '.access_token')
   3 #echo $ACCESS_TOKEN
   4 curl -X GET http://localhost:8080/productsuser  --header "Authorization: Bearer $ACCESS_TOKEN"
   5 curl -X GET http://localhost:8080/products  --header "Authorization: Bearer $ACCESS_TOKEN_ADMIN"
   6 curl -X GET http://localhost:8080/anonymous/dummy
   7 
   8 curl -X GET http://localhost:8080/products  --header "Authorization: Bearer $ACCESS_TOKEN"
   9 curl -X GET http://localhost:8080/productsuser  --header "Authorization: Bearer $ACCESS_TOKEN_ADMIN"

connect_container.sh

   1 docker exec -it test /bin/sh

stop_container.sh

   1 docker stop test
   2 docker rm test

SpringBoot 2.2.8 (resource server - Spring Security 5) + keycloak 10.0.2 (authentication server) + Java 11

   1 mkdir -p ~/Documents/test-springboot-keycloak
   2 cd ~/Documents/test-springboot-keycloak
   3 wget https://downloads.jboss.org/keycloak/10.0.2/keycloak-10.0.2.zip
   4 unzip -t keycloak-10.0.2.zip
   5 unzip keycloak-10.0.2.zip
   6 cd keycloak-10.0.2/bin
   7 sh standalone.sh 
   8 http://localhost:8080/auth
   9 admin admin admin create 
  10 http://localhost:8080/auth/admin/master/console/#/realms/master
  11 Master, add realm, MyRealm , create 
  12 Users, add user, myuser
  13 select user, credentials, mypwd mypwd, temporary off 
  14 Add role USER to MyRealm
  15 Make user myuser have role USER
  16 signout
  17 http://localhost:8080/auth/realms/MyRealm/account/
  18 
  19 realm: MyRealm
  20 user pwd: myuser mypwd
  21 client id: curl_confidential
  22 protocol: openid-connect
  23 Curl_confidential  settings: access-type confidential
  24 valid redirect url http://localhost:8080
  25 save in MyRealm, Client, client: curl_confidential
  26 tab credentials: regenerate secret 6dfe5f84-d115-4d3e-8a56-a0fcf5b2f13e
  27 
  28 curl -d 'client_id=curl_confidential' -d 'client_secret=6dfe5f84-d115-4d3e-8a56-a0fcf5b2f13e' -d 'username=myuser' -d 'password=mypwd' -d 'grant_type=password' 'http://localhost:8080/auth/realms/MyRealm/protocol/openid-connect/token'

.
├── pom.xml
└── src
    └── main
        ├── java
        │   └── com
        │       └── example
        │           └── demo
        │               └── DemoApplication.java
        └── resources
            └── application.properties

pom.xml

   1 <?xml version="1.0" encoding="UTF-8"?>
   2 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   3         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   4         <modelVersion>4.0.0</modelVersion>
   5         <parent>
   6                 <groupId>org.springframework.boot</groupId>
   7                 <artifactId>spring-boot-starter-parent</artifactId>
   8                 <version>2.2.8.RELEASE</version>
   9                 <relativePath/> <!-- lookup parent from repository -->
  10         </parent>
  11         <groupId>com.example</groupId>
  12         <artifactId>demo</artifactId>
  13         <version>0.0.1-SNAPSHOT</version>
  14         <name>demo</name>
  15         <description>Demo project for Spring Boot</description>
  16         <properties>
  17                 <java.version>11</java.version>
  18         </properties>
  19         <dependencies>
  20                 <dependency>
  21                         <groupId>org.springframework.boot</groupId>
  22                         <artifactId>spring-boot-starter-oauth2-resource-server</artifactId>
  23                 </dependency>
  24                 <dependency>
  25                         <groupId>org.springframework.boot</groupId>
  26                         <artifactId>spring-boot-starter-security</artifactId>
  27                 </dependency>
  28                 <dependency>
  29                         <groupId>org.springframework.boot</groupId>
  30                         <artifactId>spring-boot-starter-web</artifactId>
  31                 </dependency>
  32         </dependencies>
  33         <build>
  34                 <plugins>
  35                         <plugin>
  36                                 <groupId>org.springframework.boot</groupId>
  37                                 <artifactId>spring-boot-maven-plugin</artifactId>
  38                         </plugin>
  39                 </plugins>
  40         </build>
  41 </project>

src/main/resources/application.properties

server.port=8181
spring.security.oauth2.resourceserver.jwt.issuer-uri=http://localhost:8080/auth/realms/MyRealm
#logging.level.root=DEBUG
logging.level.root=INFO
logging.file=/tmp/testout.log

src/main/java/com/example/demo/DemoApplication.java

   1 package com.example.demo;
   2 
   3 import org.springframework.boot.SpringApplication;
   4 import org.springframework.boot.autoconfigure.SpringBootApplication;
   5 import org.springframework.web.bind.annotation.GetMapping;
   6 import org.springframework.web.bind.annotation.RestController;
   7 import org.springframework.security.core.Authentication;
   8 import org.springframework.security.core.GrantedAuthority;
   9 import org.springframework.security.oauth2.jwt.Jwt;
  10 
  11 @RestController
  12 @SpringBootApplication
  13 public class DemoApplication {
  14 
  15         public static void main(String[] args) {
  16                 SpringApplication.run(DemoApplication.class, args);
  17         }
  18 
  19 
  20     @GetMapping("/otherhello")
  21     public String otherHello(){
  22       return "other hello";
  23     }
  24 
  25     @GetMapping("/hello")
  26     public String hello(Authentication authentication) {
  27         String s=""; 
  28         for(int i=0; i<authentication.getAuthorities().size();i++){
  29           GrantedAuthority ga = (GrantedAuthority)  authentication.getAuthorities().toArray()[i];
  30           s +=  ga.getAuthority()  + " ";
  31         }
  32         Jwt jwt = (Jwt) authentication.getCredentials();
  33         
  34         Object[] keys = jwt.getClaims().keySet().toArray();
  35         String allkeys = "";
  36 
  37         for(int j=0; j< keys.length  ;j++){
  38           allkeys = allkeys + " " +  (String)keys[j]  + ":" + jwt.getClaims().get( keys[j] ).toString()+ " ";
  39         }
  40 
  41         return "I am authenticated with user " + authentication.getName() + " " + s + " " + authentication.getDetails().toString() + " " + allkeys;
  42     }
  43 
  44 }

src/main/java/com/example/demo/SecurityConfiguration.java

   1 package com.example.demo;
   2 
   3 import org.springframework.beans.factory.annotation.Autowired;
   4 import org.springframework.context.annotation.Bean;
   5 import org.springframework.context.annotation.Configuration;
   6 import org.springframework.security.authentication.AuthenticationManager;
   7 import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
   8 import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
   9 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
  10 import org.springframework.security.config.annotation.web.builders.WebSecurity;
  11 import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
  12 import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
  13 import org.springframework.security.config.http.SessionCreationPolicy;
  14 import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
  15 import org.springframework.security.crypto.password.PasswordEncoder;
  16 
  17 @Configuration
  18 @EnableWebSecurity
  19 public class SecurityConfiguration extends WebSecurityConfigurerAdapter {
  20 
  21         @Override
  22         protected void configure(HttpSecurity http) throws Exception {
  23                 http.oauth2ResourceServer().jwt();
  24         }
  25 
  26         @Override
  27         public void configure(WebSecurity web) throws Exception {
  28                 web.ignoring().antMatchers("/otherhello**").antMatchers("/static**");
  29         }
  30 
  31 }

src/main/webapp/static/test2.txt

test2

Invoke endpoint on resource server with access token from keycloak

   1 curl http://localhost:8181/hello -vvv
   2 TOKEN=$(curl -d 'client_id=curl_confidential' -d 'client_secret=6dfe5f84-d115-4d3e-8a56-a0fcf5b2f13e' -d 'username=myuser' -d 'password=mypwd' -d 'grant_type=password' 'http://localhost:8080/auth/realms/MyRealm/protocol/openid-connect/token' | jq -r '.access_token')
   3 curl -X GET http://localhost:8181/hello  --header "Authorization: Bearer $TOKEN"
   4 
   5 I am authenticated with user d7192f29-ee2f-4079-95f9-a75df61f3973 SCOPE_profile SCOPE_email  org.springframework.security.web.authentication.WebAuthenticationDetails@b364: RemoteIpAddress: 0:0:0:0:0:0:0:1; SessionId: null  sub:d7192f29-ee2f-4079-95f9-a75df61f3973  resource_access:{"account":{"roles":["manage-account","manage-account-links","view-profile"]}}  email_verified:false  iss:http://localhost:8080/auth/realms/MyRealm  typ:Bearer  preferred_username:myuser  aud:[account]  acr:1  realm_access:{"roles":["offline_access","uma_authorization","USER"]}  azp:curl_confidential  scope:profile email  exp:2020-06-18T23:01:09Z  session_state:a3cc9c25-ae55-492f-be5a-28aafd3a6d3f  iat:2020-06-18T22:56:09Z  jti:bc4a4a6e-5da5-434b-9a77-cb0a88c64c4c
   6 
   7 curl -X GET http://localhost:8181/otherhello
   8 # other hello
   9 
  10 curl -X GET http://localhost:8181/static/test2.txt -v
  11 # test2
  12

pyjwt

https://pyjwt.readthedocs.io/en/stable/
pip install pyjwt