HTTP 403 forbidden error in spring boot security

Spring security configuration class

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter{

    @Autowired
    private UserDetailsService userDetailsService;

    @Bean
    public PasswordEncoder getPasswordEncoder() {
        return new BCryptPasswordEncoder();
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {

        http
            .cors()
            .and()
            .authorizeRequests()
            .antMatchers("/user", "/login").permitAll()
            .antMatchers("/employee", "/insurance").hasRole("User")
            .anyRequest()
            .authenticated()
            .and()
            .httpBasic()
            .and()
            .csrf().disable();
    }

    protected void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(userDetailsService).passwordEncoder(getPasswordEncoder());
    }
}

UserDetailsService Implementation class

@Service
public class UserDetailsServiceImpl implements UserDetailsService {

    @Autowired
    private UserService userService;

    @Override
    public UserDetails loadUserByUsername(String userName) throws UsernameNotFoundException {
        User user = null;
        Set<GrantedAuthority> grantedAuthorities = null;
        try
        {
            user = userService.findByUserName(userName);
            if(user == null)
                throw new UsernameNotFoundException("User " + userName  + " not available");

            grantedAuthorities = new HashSet<>();
            for(Role role: user.getRoles()) {
                grantedAuthorities.add(new SimpleGrantedAuthority(role.getRole().toString()));
            }
        }
        catch(Exception exp) {
            exp.printStackTrace();
        }
        return new org.springframework.security.core.userdetails.User(user.getUserName(), user.getPassword(), grantedAuthorities);
    }
}

Employee Rest Controller class

@RestController
public class EmployeeController {

    @Autowired
    private EmployeeService employeeService;

    @Autowired
    private InsuranceService insuranceService;

    @PostMapping("/employee")
    public ResponseEntity<Employee> create(@RequestBody Employee employee) throws Exception {
        employee = employeeService.create(employee);
        return new ResponseEntity<Employee>(employee, HttpStatus.CREATED);
    }

    @PutMapping("/employee")
    public ResponseEntity<Employee> update(@RequestBody Employee employee) throws Exception {
        employee = employeeService.update(employee);
        return new ResponseEntity<Employee>(employee, HttpStatus.OK);
    }

    @DeleteMapping("/employee/{id}")
    public ResponseEntity<String> delete(@PathVariable("id") long id) throws Exception {
        employeeService.delete(id);
        return new ResponseEntity<String>("Employee deleted successfully", HttpStatus.OK);
    }

    @GetMapping("/employee/{id}")
    public ResponseEntity<Employee> findEmployeeDetails(@PathVariable("id") long id) throws Exception {
        Employee employee = employeeService.findById(id);
        return new ResponseEntity<Employee>(employee, HttpStatus.OK);
    }

    @GetMapping("/employee")
    public ResponseEntity<List<Employee>> findAll() throws Exception {
        List<Employee> employees = employeeService.findAll();
        return new ResponseEntity<List<Employee>>(employees, HttpStatus.OK);
    }
}

I am getting 403 forbidden error for any of the HTTP method(POST/GET/PUT) request submitted via postman to /employee URL

{
    "timestamp": "2019-09-17T05:37:35.778+0000",
    "status": 403,
    "error": "Forbidden",
    "message": "Forbidden",
    "path": "/hr-core/employee"
}

I am getting this error even though I am sending correct username & password in the basic auth header(Authorization) of HTTP request in POSTMAN. This user is also having both USER and ADMIN roles to access /employee REST endpoint. I have disabled CSRF in http security.

How can I solve this error?

Within Spring Security, there is a difference between roles and authorities. While an authority can be anything, roles are a subset of authorities that start with ROLE_.

Let's say you have the following authorities:

GrantedAuthority authority1 = new SimpleGrantedAuthority("User");
GrantedAuthority authority2 = new SimpleGrantedAuthority("ROLE_Admin");

In this case, authority1 does not contain a role, while authority2 does because it's prefixed with ROLE_.

That means, that if you use hasRole("User"), you won't have access, because it's not defined as a role. hasRole("Admin") on the other hand would work.

To solve this, you have two options:

1. Make sure your roles are really prefixed with ROLE_. If you don't store them that way in your database, you can modify your UserDetailsServiceImpl:

   String roleName = "ROLE_" + role.getRole().toString();
   grantedAuthorities.add(new SimpleGrantedAuthority(roleName));
   

2. Alternatively, you can use hasAuthority("User") instead:

   // ...
   .antMatchers("/employee", "/insurance").hasAuthority("User")
   // ...