Typically it would be best to break your questions into multiple StackOverflow questions since you are more likely to find someone that knows the answer to a single question than both.
How do we avoid creating sessions for authentication failures ?
By default Spring Security will save the last unauthenticated request to session so that after you authenticate it can automatically make the request again. For example, in a browser if you request example.com/a/b/c and are not authenticated, it will save example.com/a/b/c to the HttpSession and then have the user authenticate. After you are authenticated, it will automatically give you the result of example.com/a/b/c. This provides a nice user experience so that your users do not need to type the URL again.
In the case of a REST service this is not necessary since the client would remember which URL needs to be re-requested. You can prevent the saving by modifying the configuration to use a NullRequestCache as shown below:
protected void configure(HttpSecurity http) throws Exception {
http
.authorizeRequests()
.anyRequest().authenticated()
.and()
.requestCache()
.requestCache(new NullRequestCache())
.and()
.httpBasic();
}
You can provide custom authentication by providing your own AuthenticationProvider. For example:
import org.springframework.security.authentication.AuthenticationProvider;
import org.springframework.security.authentication.BadCredentialsException;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.core.authority.AuthorityUtils;
public class RestAuthenticationProvider implements AuthenticationProvider {
public Authentication authenticate(Authentication authentication)
throws AuthenticationException {
UsernamePasswordAuthenticationToken token = (UsernamePasswordAuthenticationToken) authentication;
String username = token.getName();
String password = (String) token.getCredentials();
// validate making REST call
boolean success = true;
// likely your REST call will return the roles for the user
String[] roles = new String[] { "ROLE_USER" };
if(!success) {
throw new BadCredentialsException("Bad credentials");
}
return new UsernamePasswordAuthenticationToken(username, null, AuthorityUtils.createAuthorityList(roles));
}
public boolean supports(Class<?> authentication) {
return (UsernamePasswordAuthenticationToken.class
.isAssignableFrom(authentication));
}
}
You can then configure your RestAuthenticationProvider using something like this:
@EnableWebSecurity
@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {
...
@Bean
public RestAuthenticationProvider restAuthenticationProvider() {
return new RestAuthenticationProvider();
}
@Autowired
public void configureGlobal(AuthenticationManagerBuilder auth, AuthenticationProvider provider) throws Exception {
auth
.authenticationProvider(provider);
}
}
