Understanding Spring Boot's Oauth2 starter - spring

Question

I started off looking at the Oauth2 starter project and minimal configuration.
https://github.com/spring-projects/spring-security-oauth/blob/master/tests/annotation/jdbc/src/main/java/demo/Application.java
All the examples either use in memory configuration or jdbc configuration for storing client roles (e.g ClientDetailsServiceConfigurer) . In my case the details should come in LDAP. So I have two questions.
How do override the default to go to ldap instead of memory or jdbc.
In general , where how do I unravel the Spring Boot thread and read the starter source code and how to change default config ? All I see is a high level annotation.
org.springframework.security.oauth2.config.annotation.web.configuration.EnableAuthorizationServer
This indirection in Spring Boot makes it extremely difficult to follow and scant documentation doesn't help. Or maybe I am missing something?
thanks !!! this has been bugging me for a while.

Answer 1

To implement Oauth2 with LDAP, you may follow this tutorial : https://raymondhlee.wordpress.com/2015/12/05/oauth2-authorization-server-with-spring-security.
You may also take a look a this other question: spring-security-oauth2 2.0.7 refresh token UserDetailsService Configuration - UserDetailsService is required
As for your other question "I want to follow the request and see what components get invoked and when": I suggest you add logging.
(1) Add logging in every method
(2) Set log level for security package in application.properties:
logging.level.org.springframework.security=DEBUG
(3) Add CommonsRequestLoggingFilter:
#Bean
public CommonsRequestLoggingFilter requestLoggingFilter() {
LOGGER.info("Creating CommonsRequestLoggingFilter");
CommonsRequestLoggingFilter crlf = new CommonsRequestLoggingFilter();
crlf.setIncludeClientInfo(true);
crlf.setIncludeQueryString(true);
crlf.setIncludePayload(true);
return crlf;
}
(4) Add log level for CommonsRequestLoggingFilter (in application.properties):
logging.level.org.springframework.web.filter.CommonsRequestLoggingFilter=DEBUG
For the OAuth/LDAP tutorial, here's the notable parts (quoted from https://raymondhlee.wordpress.com/2015/12/05/oauth2-authorization-server-with-spring-security):
Authorization Server Configuration Below is my implementation of the
AuthorizationServerConfigurerAdapter. The database schema for JDBC
client details and token services can be found in here.
#Configuration
#EnableAuthorizationServer
public class AuthorizationServerConfig extends AuthorizationServerConfigurerAdapter {
#Autowired
private AuthenticationManager authenticationManager;
#Autowired
private DataSource dataSource;
#Override
public void configure(AuthorizationServerEndpointsConfigurer endpoints) throws Exception {
endpoints.tokenStore(new JdbcTokenStore(dataSource)).authenticationManager(authenticationManager);
}
#Override
public void configure(ClientDetailsServiceConfigurer clients) throws Exception {
clients.jdbc(dataSource);
}
}
Login Security Configuration Below is the security configuration
handling user authorization.
#Configuration
#Order(Ordered.HIGHEST_PRECEDENCE) // note 1
public class LoginConfig extends WebSecurityConfigurerAdapter {
#Value("${ldap.domain}")
private String DOMAIN;
#Value("${ldap.url}")
private String URL;
#Override
protected void configure(HttpSecurity http) throws Exception {
http.requiresChannel().anyRequest().requiresSecure();
// Only requests matching regex are handled by this security configurer
http.requestMatchers().regexMatchers("/login", "/login.+", "/oauth/.+", "/j_spring_security_check", "/logout"); //
AuthenticationEntryPoint entryPoint = entryPoint();
http.exceptionHandling().authenticationEntryPoint(entryPoint);
http.formLogin(); // note 3i
http.addFilter(usernamePasswordAuthenticationFilter());
http.authorizeRequests().antMatchers("/login").permitAll();
http.authorizeRequests().antMatchers("/oauth/**").authenticated();
http.authorizeRequests().antMatchers("/j_spring_security_check").anonymous().and().csrf().disable();
}
#Override
protected void configure(AuthenticationManagerBuilder authManagerBuilder) throws Exception { // note 4
authManagerBuilder.parentAuthenticationManager(authenticationManager());
}
protected AuthenticationManager authenticationManager() {
return new ProviderManager(Arrays.asList(activeDirectoryLdapAuthenticationProvider()));
}
public AuthenticationProvider activeDirectoryLdapAuthenticationProvider() {
ActiveDirectoryLdapAuthenticationProvider provider = new ActiveDirectoryLdapAuthenticationProvider(DOMAIN, URL);
provider.setConvertSubErrorCodesToExceptions(true);
provider.setUseAuthenticationRequestCredentials(true);
return provider;
}
private AuthenticationEntryPoint entryPoint() {
return new LoginUrlAuthenticationEntryPoint("/login");
}
private UsernamePasswordAuthenticationFilter usernamePasswordAuthenticationFilter() {
UsernamePasswordAuthenticationFilter filter = new UsernamePasswordAuthenticationFilter();
filter.setAuthenticationManager(authenticationManager();
AuthenticationFailureHandler failureHandler = new SimpleUrlAuthenticationFailureHandler("/login?login_error=true");
filter.setAuthenticationFailureHandler(failureHandler);
return filter;
}
}