can I include user information while issuing an access token?

Question

I have seen in some oauth2 implementations additional information on the response returned by the authorization server when it issues access tokens. I'm wondering if there is a way to accomplish this using spring-security-oauth2. I would love to be able to include some user authorities on the access token response so that my consuming applications don't need to manage the user authorities but can still set the user on their own security contexts and apply any of their own spring-security checks.

1. How would I get that information on the access token response?
2. How would I intercept that information on the oauth2 client side and set it on the security context?

I suppose another option would be to use JWT tokens and share the appropriate information with the client applications so that they can parse the user / authorities out of the token and set it on the context. This makes me more uncomfortable since I'd prefer to be in control of which client applications could have access to this information (trusted apps only) and AFAIK only the authorization server and resource server should know how to parse the JWT tokens.

Answer 1

You will need to implement a custom TokenEnhancer like so:

public class CustomTokenEnhancer implements TokenEnhancer {

    @Override
    public OAuth2AccessToken enhance(OAuth2AccessToken accessToken, OAuth2Authentication authentication) {
        User user = (User) authentication.getPrincipal();
        final Map<String, Object> additionalInfo = new HashMap<>();

        additionalInfo.put("customInfo", "some_stuff_here");
        additionalInfo.put("authorities", user.getAuthorities());

        ((DefaultOAuth2AccessToken) accessToken).setAdditionalInformation(additionalInfo);

        return accessToken;
    }

}

and add it to your AuthorizationServerConfigurerAdapter as a bean with the corresponding setters

@Configuration
@EnableAuthorizationServer
protected static class AuthorizationServerConfiguration extends AuthorizationServerConfigurerAdapter {

    // Some autowired stuff here

    @Override
    public void configure(AuthorizationServerEndpointsConfigurer endpoints) throws Exception {
        // @formatter:off
        endpoints
            // ...
            .tokenEnhancer(tokenEnhancer());
        // @formatter:on
    }

    @Bean
    @Primary
    public AuthorizationServerTokenServices tokenServices() {
        DefaultTokenServices tokenServices = new DefaultTokenServices();
        // ...
        tokenServices.setTokenEnhancer(tokenEnhancer());
        return tokenServices;
    }

    // Some @Bean here like tokenStore

    @Bean
    public TokenEnhancer tokenEnhancer() {
        return new CustomTokenEnhancer();
    }

}

then in a controller (for example)

@RestController
public class MyController {

    @Autowired
    private AuthorizationServerTokenServices tokenServices;

    @RequestMapping(value = "/getSomething", method = RequestMethod.GET)
    public String getSection(OAuth2Authentication authentication) {
        Map<String, Object> additionalInfo = tokenServices.getAccessToken(authentication).getAdditionalInformation();

        String customInfo = (String) additionalInfo.get("customInfo");
        Collection<? extends GrantedAuthority> authorities = (Collection<? extends GrantedAuthority>) additionalInfo.get("authorities");

        // Play with authorities

        return customInfo;
    }

}

I'm personally using a JDBC TokenStore so my "Some autowired stuff here" are corresponding to some @Autowired Datasource, PasswordEncoder and what not.

Hope this helped!