Invalid OAuth2 login attempts don't emit a corresponding ApplicationEvent

[sdavids13]

Summary

I would like to log requests for invalid attempts for authenticating via OAuth 2.0 bearer tokens (via JWT) for which I have ApplicationListeners for both AbstractAuthenticationEvent and AbstractAuthorizationEvent events which log failures as they are seen. Currently when presented with invalid JWT bearer tokens a 401 HTTP response is provided but no Application Listener events are fired that corresponds to the error response.

Actual Behavior

When submitting a request with a bad JWT bearer token the application responds with a 401 response code but no ApplicationListener event is fired that correlates to the bad response. Currently I see an error that says:

  "classname": "org.springframework.security.oauth2.server.resource.web.BearerTokenAuthenticationFilter",
  "method": "doFilterInternal",
  "file": "BearerTokenAuthenticationFilter.java",
  "line": 135,
  "logger_name": "org.springframework.security.oauth2.server.resource.web.BearerTokenAuthenticationFilter",
  "level": "DEBUG",
  "message": "Authentication request for failed!",
  "stack_trace": "org.springframework.security.oauth2.core.OAuth2AuthenticationException: An error occurred while attempting to decode the Jwt: Signed JWT rejected: Invalid signature
.......

Upon inspection of the BearerTokenAuthenticationFilter it seems to merely manipulate the HTTPServletResponse in the default implementation instead of producing any application events.

Expected Behavior

On malformed JWT bearer token error responses a corresponding application event should be sent that implements an AbstractAuthenticationFailureEvent.

Configuration

Dependencies:

implementation("org.springframework.boot:spring-boot-starter-actuator")
implementation("org.springframework.boot:spring-boot-starter-oauth2-resource-server")
...

WebSecurityConfigurerAdapter:

http
    .cors()
    .and()
    .authorizeRequests()
    .antMatchers(AUTH_WHITELIST)
    .permitAll()
    .anyRequest()
    .hasAnyAuthority("ROLE_REDACTED", .....)
    .and()
    .oauth2ResourceServer()
    .jwt()
    .jwtAuthenticationConverter(authenticationConverter);

Version

Spring Boot 2.2.2.RELEASE -> (Spring Security 5.2.1.RELEASE)

[sdavids13]

I attempted to get the event publisher to recognize the OAuth2AuthenticationException by adding the following bean to the Application Context:

  @Bean
  public DefaultAuthenticationEventPublisher authenticationEventPublisher(ApplicationEventPublisher publisher) {
    DefaultAuthenticationEventPublisher authPublisher = new DefaultAuthenticationEventPublisher(publisher);
    Properties p = new Properties();
    p.put(OAuth2AuthenticationException.class.getName(), AuthenticationFailureBadCredentialsEvent.class.getName());
    authPublisher.setAdditionalExceptionMappings(p);

    return authPublisher;
  }

I continued to get log messages saying:

{
  "classname": "org.springframework.security.authentication.DefaultAuthenticationEventPublisher",
  "method": "publishAuthenticationFailure",
  "file": "DefaultAuthenticationEventPublisher.java",
  "line": 125,
  "logger_name": "org.springframework.security.authentication.DefaultAuthenticationEventPublisher",
  "level": "DEBUG",
  "message": "No event was found for the exception org.springframework.security.oauth2.core.OAuth2AuthenticationException"
}

I then wired in the event publisher into the WebSecurityConfigurerAdapter via:

  private final AuthenticationEventPublisher authEventPublisher;
  public SecurityConfig(DefaultAuthenticationEventPublisher authEventPublisher) {
    this.authEventPublisher = authEventPublisher;
  }
  protected void configure(AuthenticationManagerBuilder auth) throws Exception {
    auth.authenticationEventPublisher(authEventPublisher);
  }

Still that didn't work... I then tried to set the properties again in the constructor which still doesn't work either:

  public SecurityConfig(DefaultAuthenticationEventPublisher authEventPublisher) {
    this.authEventPublisher = authEventPublisher;

    Properties p = new Properties();
    p.put(OAuth2AuthenticationException.class.getName(),
        AuthenticationFailureBadCredentialsEvent.class.getName());
    authEventPublisher.setAdditionalExceptionMappings(p);
  }

All produced the same log message saying No event was found for the exception org.springframework.security.oauth2.core.OAuth2AuthenticationException. Finally, I decided to create my own AuthenticationEventPublisher and configure it using configure(AuthenticationManagerBuilder auth) but when looking at the logs the Spring DefaultAuthenticationEventPublisher is still used instead of my custom implementation.

Long story short.. there seems to be 2 problems:

1. The DefaultAuthenticationEventPublisher should include OAuth2AuthenticationException as one of it's handled exceptions
2. The WebSecurityConfigurerAdapter doesn't seem to honor passing in a custom authenticationEventPublisher

[jzheaux]

@sdavids13, thanks for the report, and sorry to hear about all the debugging woes!

I did a bit of digging and found that the OAuth2ResourceServerConfigurer is relying on this AuthenticationEventPublisher in WebSecurityConfigurerAdapter#getHttp:

DefaultAuthenticationEventPublisher eventPublisher = objectPostProcessor
				.postProcess(new DefaultAuthenticationEventPublisher());

It would be better if this first looked for an AuthenticationEventPublisher bean, and then defaulted if it couldn't find one.

In the meantime, the following workaround should do the trick:

private ProviderManager providerManager() {
    JwtDecoder jwtDecoder = JwtDecoders.fromIssuerLocation(...);
    JwtAuthenticationProvider authenticationProvider = 
        new JwtAuthenticationProvider(jwtDecoder);
    authenticationProvider.setJwtAuthenticationConverter(jwtAuthenticationConverter);
    ProviderManager providerManager = new ProviderManager
        (Arrays.asList(authenticationProvider));
    providerManager.setAuthenticationEventPublisher(fooPublisher);
    return providerManager;
}

And then:

protected void configure(HttpSecurity http) throws Exception {
    http
        .cors(withDefaults())
        .authorizeRequests(authz -> authz
            .antMatchers(AUTH_WHITELIST).permitAll()
            .anyRequest().hasAnyAuthority("ROLE_REDACTED", .....)
        )
        .oauth2ResourceServer(oauth2 -> oauth2
            .jwt(j -> j
                .authenticationManager(providerManager())
            )
        );
}

[sdavids13]

Looks like the work-around you provided works - thanks! Might I also suggest you add the following code as well:

diff --git a/core/src/main/java/org/springframework/security/authentication/DefaultAuthenticationEventPublisher.java b/core/src/main/java/org/springframework/security/authentication/DefaultAuthenticationEventPublisher.java
index 2d0015fc5..54f72495f 100644
--- a/core/src/main/java/org/springframework/security/authentication/DefaultAuthenticationEventPublisher.java
+++ b/core/src/main/java/org/springframework/security/authentication/DefaultAuthenticationEventPublisher.java
@@ -92,6 +92,9 @@ public class DefaultAuthenticationEventPublisher implements AuthenticationEventP
                addMapping(
                                "org.springframework.security.authentication.cas.ProxyUntrustedException",
                                AuthenticationFailureProxyUntrustedEvent.class);
+               addMapping(
+                               "org.springframework.security.oauth2.core.OAuth2AuthenticationException",
+                               AuthenticationFailureBadCredentialsEvent.class);
        }
 
        public void publishAuthenticationSuccess(Authentication authentication) {

[jzheaux]

@sdavids13 I'm glad the workaround worked!

As for adding the exception by default, my concern is that not all OAuth2AuthenticationExceptions are due to bad credentials, so the event could be misleading.

One way might be to simplify how custom mappings are added. It seems reasonable to overload setAdditionalExceptionMappings to take a more powerful type:

public void setAdditionalExceptionMappings(Map<
        Class<? extends AuthenticationException>,
        Class<? extends AbstractAuthenticationFailureEvent>> additionalExceptionMappings)

And then you could instead do:

@Bean 
AuthenticationEventPublisher eventPublisher(ApplicationEventPublisher application) {
    AuthenticationEventPublisher authentication = 
        new DefaultAuthenticationEventPublisher(application);
    authentication.setAdditionalExceptionMappings(
        Collections.singletonMap(OAuth2AuthenticationException.class, FooEvent.class));
    return authentication;
}

Would you be interested in submitting a PR for that feature?