Authenticating LDAP via LDAP Repository

Question

I have trouble resolving different encoding types from my LDAP server (which is in SSHA) and the authenticating value of just plain text.

I am using LDAP Repository to retrieve my LDAP server and used AuthenticationManager and my own implementation of `UserDetailService.

The problem is always receive a Bad Credentials exception when i try to authenticate.

As seen on my codes below;

when i request to /auth , i have a plain text username and password . However, i when try to authenticate it via AuthenticationManager , it gives me a Bad Credentials. Now, i know that this has got to do with the UserDetailService.getPassword() and the password i provided in UsernamePasswordAuthenticationToken . Its about the different encryption type. My LDAP has an {SSHA}, also translated to a binary (bytes) and the encoder is Bcrypt and String.

Now my question is how do you properly authenticate a password against the password return by LdapRespository ?

UPDATES

2020-04-12 17:09:46.655  INFO 6672 --- [nio-8080-exec-1] s.w.s.SantaRestApiSecurityConfiguration  : Raw Password:  jdoe123 | Encoded Password: {SSHA}kMgk3gD4prAa/9m4wsPbuAoGhO7UvH2v6+W0Dg==
2020-04-12 17:09:58.110  INFO 6672 --- [nio-8080-exec-1] s.w.s.SantaRestApiSecurityConfiguration  : Raw Password: {SSHA}kMgk3gD4prAa/9m4wsPbuAoGhO7UvH2v6+W0Dg== matches Encoded Password: {SSHA}k1Pp3NICHbwuxFFdT7zno/iG/NTILZGL = false

Above logs is during password matching in PasswordEncoder . Based from it. it shows that the Raw Password (inputted by user) has a different hash from the Encoded Password (from ldap server).

I used LdapShaPasswordEncoder.encode to hash user inputted password.

Also, i noticed that everytime i want to authenticate (call http://locahost:xxxx/auth ), the user inputted password's hash changes everytime. I think this is normal when hashing

Security Configuration NOTE: I am allowing all REST-API Endpoints for now, i gonna restrict it later

@Configuration
@EnableWebSecurity
public class SantaRestApiSecurityConfiguration extends WebSecurityConfigurerAdapter   {

    @Autowired
    AuthService authService;

    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        // configure AuthenticationManager so that it knows from where to load
        // user for matching credentials
        // Use BCryptPasswordEncoder
        auth.userDetailsService(authService).passwordEncoder(passwordEncoder());
    }

    @Bean
    @Override
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        // TODO Auto-generated method stub
        http.csrf()
            .disable()
            .authorizeRequests().antMatchers("/*").permitAll();
    }

    @Override
    public void configure(WebSecurity web) throws Exception {
        web.ignoring().antMatchers("/*");
    }

    /*
     * i am not sure about this since my LDAP server has 
     * a SSHA password encrpytion
     * 
     * */
    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }
}

LoginController

@RestController
@RequestMapping("/auth")
public class LoginController {

    public static Logger logger = LoggerFactory.getLogger(LoginController.class);

    @Autowired
    private AuthenticationManager authManager;

    @PostMapping
    public ResponseEntity<String> login(@RequestBody Map<String, String> credentials) {
        String username = credentials.get("username");
        String password = credentials.get("password");

        authManager.authenticate(new UsernamePasswordAuthenticationToken(username, password));

        return new ResponseEntity<String>("", HttpStatus.OK);
    }
}

UserDetailService implementation

@Service
public class AuthService implements UserDetailsService {

    public static Logger logger = LoggerFactory.getLogger(AuthService.class);

    @Autowired
    UserLdapRepository ldapRepo;

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {

        UserLdap e = ldapRepo.findByUid(username);
        logger.info("{}",e.toString());

        return new AuthDetails(e.getCn(), 
                               e.getPassword(),
                               e.getUid(), 
                               e.getMail(), 
                               e.getSn(), 
                               Long.toString( e.getUidNumber()));
    }
}

UserDetails implemenation

public class AuthDetails implements UserDetails {

    public static Logger logger = LoggerFactory.getLogger(AuthDetails.class);

    private String username;
    private String password;
    private String email;
    private String uidNumber;
    private String sn;
    private String uid;

    public AuthDetails(String username, String password, String uid, String email,String sn, String uidNumber) {
        this.uid = uid;
        this.password = password;
        this.username = username;
        this.email = email;
        this.sn = sn;
        this.uidNumber = uidNumber;
    }

    /*
     * Here i am not sure how to implement this one to satisfy AuthenticationManager
     *
     *
     **/
    @Override
    public String getPassword() {
        return this.password;
    }

    @Override
    public String getUsername() {
        // TODO Auto-generated method stub
        return this.username;
    }

    // some method to implement

}

Answer 1

You are using BCryptPasswordEncoder but in LDAP is using the SSHA encryption.

You need to modify the method passwordEncoder in class SantaRestApiSecurityConfiguration

  @Bean
public PasswordEncoder passwordEncoder() {
   return  new LdapShaPasswordEncoder();

}



public Class UserLdap {

    @Attribute(name = "userPassword", type = Type.BINARY)
    private byte[] password;
}

and change the method loadUserByUsername

@Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {

        UserLdap e = ldapRepo.findByUid(username);
        logger.info("{}",e.toString());
        String password = "{SSHA}" + new String(e.getPassword());
        return new AuthDetails(e.getCn(), 
                               password,
                               e.getUid(), 
                               e.getMail(), 
                               e.getSn(), 
                               Long.toString( e.getUidNumber()));
    }