Add custom UserDetailsService to Spring Security OAuth2 app

Question

How do I add the custom UserDetailsService below to this Spring OAuth2 sample?

The default user with default password is defined in the application.properties file of the authserver app.

However, I would like to add the following custom UserDetailsService to the demo package of the authserver app for testing purposes:

package demo;

import java.util.List;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.AuthorityUtils;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.security.provisioning.UserDetailsManager;
import org.springframework.stereotype.Service;

@Service
class Users implements UserDetailsManager {

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        String password;
        List<GrantedAuthority> auth = AuthorityUtils.commaSeparatedStringToAuthorityList("ROLE_USER");
        if (username.equals("Samwise")) {
            auth = AuthorityUtils.commaSeparatedStringToAuthorityList("ROLE_HOBBIT");
            password = "TheShire";
        }
        else if (username.equals("Frodo")){
            auth = AuthorityUtils.commaSeparatedStringToAuthorityList("ROLE_HOBBIT");
            password = "MyRing";
        }
        else{throw new UsernameNotFoundException("Username was not found. ");}
        return new org.springframework.security.core.userdetails.User(username, password, auth);
    }

    @Override
    public void createUser(UserDetails user) {// TODO Auto-generated method stub
    }

    @Override
    public void updateUser(UserDetails user) {// TODO Auto-generated method stub
    }

    @Override
    public void deleteUser(String username) {// TODO Auto-generated method stub
    }

    @Override
    public void changePassword(String oldPassword, String newPassword) {
        // TODO Auto-generated method stub
    }

    @Override
    public boolean userExists(String username) {
        // TODO Auto-generated method stub
        return false;
    }
}

As you can see, this UserDetailsService is not autowired yet, and it purposely uses insecure passwords because it is only designed for testing purposes.

What specific changes need to be made to the GitHub sample app so that a user can login as username=Samwise with password=TheShire, or as username=Frodo with password=MyRing? Do changes need to be made to AuthserverApplication.java or elsewhere?

---

SUGGESTIONS:

---

The Spring OAuth2 Developer Guide says to use a GlobalAuthenticationManagerConfigurer to configure a UserDetailsService globally. However, googling those names produces less than helpful results.

Also, a different app that uses internal spring security INSTEAD OF OAuth uses the following syntax to hook up the UserDetailsService, but I am not sure how to adjust its syntax to the current OP:

@Order(Ordered.HIGHEST_PRECEDENCE)
@Configuration
protected static class AuthenticationSecurity extends GlobalAuthenticationConfigurerAdapter {

    @Autowired
    private Users users;

    @Override
    public void init(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(users);
    }
}

I tried using @Autowire inside the OAuth2AuthorizationConfig to connect Users to the AuthorizationServerEndpointsConfigurer as follows:

@Autowired//THIS IS A TEST
private Users users;//THIS IS A TEST

@Override
public void configure(AuthorizationServerEndpointsConfigurer endpoints) throws Exception {
   endpoints.authenticationManager(authenticationManager)
        .accessTokenConverter(jwtAccessTokenConverter())
        .userDetailsService(users)//DetailsService)//THIS LINE IS A TEST
        ;
}

But the Spring Boot logs indicate that the user Samwise was not found, which means that the UserDetailsService was not successfully hooked up. Here is the relevant excerpt from the Spring Boot logs:

2016-04-20 15:34:39.998 DEBUG 5535 --- [nio-9999-exec-9] o.s.s.a.dao.DaoAuthenticationProvider    :  
        User 'Samwise' not found
2016-04-20 15:34:39.998 DEBUG 5535 --- [nio-9999-exec-9]   
        w.a.UsernamePasswordAuthenticationFilter :  
        Authentication request failed:  
        org.springframework.security.authentication.BadCredentialsException:  
        Bad credentials

What else can I try?

Answer 1

I ran into a similar issue when developing my oauth server with Spring Security. My situation was slightly different, as I wanted to add a UserDetailsService to authenticate refresh tokens, but I think my solution will help you as well.

Like you, I first tried specifying the UserDetailsService using the AuthorizationServerEndpointsConfigurer, but this does not work. I'm not sure if this is a bug or by design, but the UserDetailsService needs to be set in the AuthenticationManager in order for the various oauth2 classes to find it. This worked for me:

@Configuration
@EnableWebSecurity 
public class SecurityConfig extends WebSecurityConfigurerAdapter {

  @Autowired
  Users userDetailsService;

  @Autowired
  public void configAuthentication(AuthenticationManagerBuilder auth) throws Exception {
    auth.userDetailsService(userDetailsService);
  }

  @Override
  protected void configure(HttpSecurity http) throws Exception {
    http.authorizeRequests()
    // other stuff to configure your security
  }

}

I think if you changed the following starting at line 73, it may work for you:

@Override
protected void configure(AuthenticationManagerBuilder auth) throws Exception {
    auth.parentAuthenticationManager(authenticationManager)
        .userDetailsService(userDetailsService);
}

You would also of course need to add @Autowired Users userDetailsService; somewhere in WebSecurityConfigurerAdapter

Other things I wanted to mention:

1. This may be version specific, I'm on spring-security-oauth2 2.0.12
2. I can't cite any sources for why this is the way it is, I'm not even sure if my solution is a real solution or a hack.
3. The GlobalAuthenticationManagerConfigurer referred to in the guide is almost certainly a typo, I can't find that string anywhere in the source code for anything in Spring.