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Spring method-level security

In addition to authentication, Spring Security also checks the authorization of the logged-in user. After logging in, access to resources by authorized users will be completed based on the user's ROLE.

When creating a user in the WebSecurityConfig class, we can also specify the user's ROLE.

The security applied to the method is limited to unauthorized users and only allows real users.

Let's look at an example. First, create a Maven project by providing the details.



The project initially looks like this:



Spring security configuration

Now, configure the application to prevent unauthorized and unauthenticated users. It requires the four Java files listed below to create a package com.w3codebox and place it inside.

//AppConfig.java

This class is used to set the view suffix and prefix with the help of the view resolver.

package com.w;3codebox;
import org.springframework.context.annotation.Bean;  
import org.springframework.context.annotation.ComponentScan;  
import org.springframework.context.annotation.Configuration;  
import org.springframework.web.servlet.config.annotation.EnableWebMvc;  
import org.springframework.web.servlet.view.InternalResourceViewResolver;  
import org.springframework.web.servlet.view.JstlView;  
@EnableWebMvc  
@Configuration  
@ComponentScan({	"com.w"3codebox.controller.*"	})"  
public class AppConfig {  
    @Bean  
    public InternalResourceViewResolver viewResolver() {  
        InternalResourceViewResolver viewResolver  
                          = new InternalResourceViewResolver();  
        viewResolver.setViewClass(JstlView.class);  
        viewResolver.setPrefix("/WEB-INF/views/");  
        viewResolver.setSuffix(".jsp");  
        return viewResolver;  
    }  
}

//MvcWebApplicationInitializer.java.java

package com.w;3codebox;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;  
public class MvcWebApplicationInitializer extends  
        AbstractAnnotationConfigDispatcherServletInitializer {  
    @Override  
    protected Class<?>[] getRootConfigClasses() {  
        return new Class[] { WebSecurityConfig.class };  
    }  
    @Override  
    protected Class<?>[] getServletConfigClasses() {  
        // TOdo Auto-generated method stub  
        return null;  
    }  
    @Override  
    protected String[] getServletMappings() {  
        return new String[] { "/"	};"  
    }  
}

//SecurityWebApplicationInitializer.java

package com.w;3codebox;
import org.springframework.security.web.context.*;  
public class SecurityWebApplicationInitializer  
    extends AbstractSecurityWebApplicationInitializer {  
}

//WebSecurityConfig.java

This class is used to create users and set their authentication. Each time a user wants to access the application, they need to log in.

package com.w;3codebox;
import org.springframework.context.annotation.*;
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.*;  
import org.springframework.security.core.userdetails.*;
import org.springframework.security.core.userdetails.User.UserBuilder;  
import org.springframework.security.provisioning.InMemoryUserDetailsManager;
import org.springframework.security.web.util.matcher.AntPathRequestMatcher;  
@EnableWebSecurity  
@ComponentScan("com.w")3codebox")  
@EnableGlobalMethodSecurity(prePostEnabled=true)
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {  
@Bean  
public UserDetailsService userDetailsService() {
    // ensure the passwords are encoded properly
     UserBuilder users = User.withDefaultPasswordEncoder();
     InMemoryUserDetailsManager manager = new InMemoryUserDetailsManager();
manager.createUser(users.username("irfan").password("user123").roles("USER").build());
manager.createUser(users.username("admin").password("admin123").roles("ADMIN").build());
     return manager;
    } 
@Override  
protected void configure(HttpSecurity http) throws Exception {  
      http.authorizeRequests().
      .antMatchers("/index","/").permitAll()
      .antMatchers("/admin","/user()).authenticated()
      .and()
      .formLogin()
      .and()
      .logout()
      .logoutRequestMatcher(new AntPathRequestMatcher("/logout"));
}  
}

controller

Create the controller HomeController and put it in com.w3codebox.controller in the package.

//HomeController.java;

package com.w;3codebox.controller;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.stereotype.Controller;  
import org.springframework.web.bind.annotation.RequestMapping;  
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller  
public class HomeController {  
    @RequestMapping(value="/, method=RequestMethod.GET)  
    public String index() {  
        return "index";  
    }  
    @RequestMapping(value="/user, method=RequestMethod.GET)  
    public String user() {  
       return "admin";
    }  
    @RequestMapping(value="/admin, method=RequestMethod.GET)  
    public String admin() {  
        return "admin";  
    }
    // Only, a person having ADMIN role can access this method.
    @RequestMapping(value="/update, method=RequestMethod.GET) 
    @ResponseBody
    @PreAuthorize("hasRole('ROLE_ADMIN')")
    public String update() {  
        return "record updated ";  
    }
}

views

Create the following views (JSP pages) to generate output for users. Place all views in WEB-INF/views folder.

//index.jsp

<html>  
<head>  
<title>Home Page/title>  
</head>  
<body>  
Welcome to w3codebox! <br> <br>
Login as: 
<a href="admin">Admin/a> <a href="user">User/a>
</body>  
</html>

//admin.jsp

<html>  
<head>  
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">  
<title>Home Page/title>  
</head>  
<body>  
<span style="color: green">Login Successful!/span> ? <a href="logout" style="text-decoration: none;">logout</a>  <br> <br>
<a href="update" style="text-decoration: none;">Update Record</a>
</body>  
</html>

Packaging dependencies

The following are the dependencies required to create this project.

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.w3codebox</groupId>
  <artifactId>springmethod</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  <properties>  
    <maven.compiler.target>1.8</maven.compiler.target>  
    <maven.compiler.source>1.8</maven.compiler.source>  
</properties>  
<dependencies>  
  <dependency>  
            <groupId>org.springframework</groupId>  
            <artifactId>spring-webmvc</artifactId>  
            <version>5.0.2.RELEASE</version>  
        </dependency>  
        <dependency>  
        <groupId>org.springframework.security</groupId>  
        <artifactId>spring-security-web</artifactId>  
        <version>5.0.0.RELEASE</version>  
    </dependency>  
<dependency>
    <groupId>org.springframework.security</groupId>
    <artifactId>spring-security-core</artifactId>
    <version>5.0.4.RELEASE</version>
</dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework.security/spring-security-config -->
<dependency>
    <groupId>org.springframework.security</groupId>
    <artifactId>spring-security-config</artifactId>
    <version>5.0.4.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
        <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->  
<dependency>  
    <groupId>javax.servlet</groupId>  
    <artifactId>javax.servlet-api</artifactId>  
    <version>3.1.0</version>  
    <scope>provided</scope>  
</dependency>  
<dependency>  
    <groupId>javax.servlet</groupId>  
    <artifactId>jstl<//artifactId>  
    <version>1.2</version>  
</dependency>  
<!-- https://mvnrepository.com/artifact/org.springframework/spring-framework-bom -->
</dependencies>  
  <build>  
    <plugins>  
        <plugin>  
            <groupId>org.apache.maven.plugins<//groupId>  
            <artifactId>maven-war-plugin</artifactId>  
            <version>2.6</version>
                   <configuration>  
                <failOnMissingWebXml>false<//failOnMissingWebXml>  
            </configuration>  
        </plugin>  
    </plugins>  
  </build>  
</project>

Project Structure

After adding all the above files, our project looks like this:



Run the server

Output:



First login as ADMIN



After logging in,



Click Update RecordThen check if the record has been updated, because the user's role is ADMIN.



User Login

Now, log in as a user.




Now, click Update RecordThe server denied access due to the user role being USER.