Custom Authentication provider with Spring Security and Java Config - spring

Question

How can I define a custom Authentication provider by using Spring Security with Java Configurations?
I would like to perform a login checking credentials on my own database.

Answer 1

The following does what you need (CustomAuthenticationProvider is your implementation which needs to be managed by Spring)
#Configuration
#EnableWebMvcSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
#Autowired
private CustomAuthenticationProvider customAuthenticationProvider;
#Override
protected void configure(HttpSecurity http) throws Exception {
/**
* Do your stuff here
*/
}
#Override
protected void configure(AuthenticationManagerBuilder auth) throws Exception {
auth.authenticationProvider(customAuthenticationProvider);
}
}

Answer 2

As shown on baeldung.com, define your authentication provider as follow:
#Component
public class CustomAuthenticationProvider implements AuthenticationProvider {
#Override
public Authentication authenticate(Authentication authentication)
throws AuthenticationException {
String name = authentication.getName();
String password = authentication.getCredentials().toString();
if (shouldAuthenticateAgainstThirdPartySystem(username, password)) {
// use the credentials
// and authenticate against the third-party system
return new UsernamePasswordAuthenticationToken(
name, password, new ArrayList<>());
} else {
return null;
}
}
#Override
public boolean supports(Class<?> authentication) {
return authentication.equals(
UsernamePasswordAuthenticationToken.class);
}
}
and following code is corresponding java config:
#Configuration
#EnableWebSecurity
#ComponentScan("org.project.security")
public class SecurityConfig extends WebSecurityConfigurerAdapter {
#Autowired
private CustomAuthenticationProvider authProvider;
#Override
protected void configure(
AuthenticationManagerBuilder auth) throws Exception {
auth.authenticationProvider(authProvider);
}
#Override
protected void configure(HttpSecurity http) throws Exception {
http.authorizeRequests().anyRequest().authenticated()
.and()
.httpBasic();
}
}