java.lang.NullPointerException when brute force deteciton is enabled on Keycloak 24.0.1

[jacquemard]

With Keycloak 24.0.1, under some conditions, the following error occurs. Seems to be when we activate brute force detection with ext-event-http. On Keycloak 23.0.7, everything seems to work fine. I have also tested to build from the branch xgp/24-testcontainers, and the same error occurs :

deepsso-1         | 2024-03-08 09:56:48,494 WARN  [io.phasetwo.keycloak.events.MultiEventListenerProviderFactory] (Brute Force Protector) Error configuring provider: java.lang.NullPointerException: Cannot invoke "org.keycloak.models.RealmModel.getName()" because the return value of "io.phasetwo.keycloak.config.ConfigurationAware.getRealm(org.keycloak.models.KeycloakSession)" is null
deepsso-1         |     at io.phasetwo.keycloak.config.ConfigurationAware.getConfigurations(ConfigurationAware.java:17)
deepsso-1         |     at io.phasetwo.keycloak.events.MultiEventListenerProviderFactory.create(MultiEventListenerProviderFactory.java:23)
deepsso-1         |     at io.phasetwo.keycloak.events.MultiEventListenerProviderFactory.create(MultiEventListenerProviderFactory.java:13)
deepsso-1         |     at org.keycloak.services.DefaultKeycloakSession.getProvider(DefaultKeycloakSession.java:195)
deepsso-1         |     at org.keycloak.events.EventBuilder.lambda$getEventListeners$0(EventBuilder.java:84)
deepsso-1         |     at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
deepsso-1         |     at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1707)
deepsso-1         |     at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
deepsso-1         |     at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
deepsso-1         |     at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
deepsso-1         |     at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
deepsso-1         |     at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682)
deepsso-1         |     at org.keycloak.events.EventBuilder.getEventListeners(EventBuilder.java:93)
deepsso-1         |     at org.keycloak.events.EventBuilder.<init>(EventBuilder.java:68)
deepsso-1         |     at org.keycloak.services.managers.DefaultBruteForceProtector.sendEvent(DefaultBruteForceProtector.java:240)
deepsso-1         |     at org.keycloak.services.managers.DefaultBruteForceProtector.failure(DefaultBruteForceProtector.java:203)
deepsso-1         |     at org.keycloak.services.managers.DefaultBruteForceProtector.run(DefaultBruteForceProtector.java:291)
deepsso-1         |     at java.base/java.lang.Thread.run(Thread.java:840)

I am not sure what the current status regarding the support of KC 24 is, but I thought I might as well report this issue.

Steps to reproduce

• docker compose up with a keycloak-events build within a providers folder:

version: '3.3'
services:
  deepsso:
    environment:
      - KEYCLOAK_ADMIN=admin
      - KEYCLOAK_ADMIN_PASSWORD=admin
    image: quay.io/keycloak/keycloak:24.0.1
    command:
      - "start-dev"
    volumes:
      - ./providers:/opt/keycloak/providers
    ports:
      - 8080:8080

  webhook-tester:
    image: coveros/webhook-tester
    hostname: webhook.internal

• Create a new realm with the following via the admin console:

{
  "id": "test",
  "realm": "test",
  "attributes": {
    "_providerConfig.ext-event-http": "{\"targetUri\": \"http://webhook.internal:8080/json-hook\",\"sharedSecret\":\"abcd123\"}"
  }
}

In the created realm:

• Create a new user "[email protected]" with a random, non-temporary password
• Activate bruteforce with a "Max login failure" of 2 attempt (temporary lockout)
• Add ext-event-http to the event listener list
• Try login with the user created before on http://127.0.0.1:8080/admin/test/console/ with a wrong password 2 times
  • Raises no error in the console on keycloak 23.0.7
  • Raises the error on keycloak 24.0.1 with keycloak-event built from main branch
  • Raises the error on keycloak 24.0.1 with keycloak-event built from xgp/24-testcontainers

Let me know if you need additional information.

[xgp]

Thanks for the report. We are currently testing 24, and we will incorporate this before a release that supports that version.

[xgp]

@jacquemard It looks like there is a regression in Keycloak where KeycloakContext is not set in session when executing DefaultBruteForceProtector.sendEvent. I filed this in the Keycloak issues keycloak/keycloak#27740

We'll probably stop the NPE from being thrown, but since there is no way to get the realm, the listener will just fail silently until Keycloak fixes the upstream bug.

[jacquemard]

Oh ok I see, thanks for the details and clarifying the issue, in that case we'll probably wait for the fix from keycloak side to be pushed before upgrading to v24.

[xgp]

#51 has a fix to stop this throwing an exception, but we will not fix the core regression from Keycloak. However, it is now on their radar, and they actually looked at the bug.

[xgp]

@jacquemard this isn't going to be changed by the Keycloak team, so this event type won't be received by this event listener type for the time being. I'll leave this open until we have the time to figure out a workaround or someone wants to suggest and PR a fix.

[jacquemard]

Thanks a lot @xgp for the update and your involvement on this. I'll see what we will do concerning this issue.

[spinanicky]

@xgp Has this been resolved? Still seeing this error on webhook. (Using V.30)

2024-07-24 20:53:50,561 WARN  [io.phasetwo.keycloak.events.WebhookSenderEventListenerProvider] (executor-thread-39) Error converting and scheduling event: org.keycloak.events.admin.AdminEvent@529cfc54: java.lang.NullPointerException: Cannot invoke "org.keycloak.models.UserModel.getUsername()" because "user" is null

	at io.phasetwo.keycloak.events.WebhookSenderEventListenerProvider.completeAdminEventAttributes(WebhookSenderEventListenerProvider.java:166)

	at io.phasetwo.keycloak.events.WebhookSenderEventListenerProvider.onEvent(WebhookSenderEventListenerProvider.java:69)

	at org.keycloak.services.resources.admin.AdminEventBuilder.send(AdminEventBuilder.java:290)

	at org.keycloak.services.resources.admin.AdminEventBuilder.success(AdminEventBuilder.java:272)

	at org.keycloak.services.resources.admin.GroupResource.deleteGroup(GroupResource.java:159)

[xgp]

@spinanicky That's a different error. It looks like there are cases where there is a userId in the event, but the lookup of that user returns null. Can you file a separate issue for this?

Where it's failing: https://github.com/p2-inc/keycloak-events/blob/main/src/main/java/io/phasetwo/keycloak/events/WebhookSenderEventListenerProvider.java#L166