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https://github.com/snyk-labs/java-goof


https://github.com/snyk-labs/java-goof

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# Kubernetes based Todolist + Log4Shell exploit

To deploy Todolist on Kubernetes along with the needed ldap backend for exploiting the Log4shell

vulnerability:



## Prerequisites

1. A kubernetes cluster where you have permissions to create namespaces, deployments and services

2. The `kubectl` client and credenials configuration

3. Docker Desktop or docker-ce (for building and pushing images)

4. A DockerHub account that you are logged in with at the command prompt (via `docker login`)



## Quickstart

Assuming you have your kubernetes cluster up and ready, from the top level of this repo you can run `./k8s-quickstart.sh` which will do the following:

1. Builds todolist-goof image and pushes it to Docker Hub. _(see below for account/tagging info)_

2. Deploys the todolist to the `default` namespace in your kubernetes cluster along with a LoadBalancer type service

3. Builds the log4shell-server image and pushes to Docker Hub. _(see below for account/tagging info)_

4. Deploys the log4shell-server and a pair of ClusterIP type services into a new namespace named `darkweb` in your Kubernetes cluster.



NOTE: You will be prompted for your DockerHub account in order for the scripts to tag, push and pull the images.

If you set and environmental variable named `DOCKER_ACCOUNT` to that account name, the script will pre-populate that prompt with it.

```bash

export DOCKER_ACCOUNT="yourdockeraccount"

```

## Accessing the application

Once complete, run `kubectl get svc` and note the IP Address or hostname of the `goof` service.



You should be able to open a browser to http://{svc-ip-addr}/todolist and see the app



#### EKS cluster notes

* In order to perform NetworkPolicy egress examples, you will need to deploy the Calico CNI plugin as EKS does not implement NetworkPolicy by default.

  The `eks-calico.sh` script in `todolist-goof/k8s` will deploy this for you. (that script is sym-linked to the top level here too)

* You should log into the AWS console and change inbound access for the good service's ELB to only allow your home IP, otherwise you *will* have audience members trying to mess with it.



#### Docker Desktop Kubernetes notes

* Docker Desktop automatically serves the goof service loadblancer external IP to your workstation's localhost so the app will be available at http://localhost/todolist

* Docker Desktop Kubernetes CNI does not implement Network Policy so you will not be able to demonstrate any mitigation techniques that use that.



#### Kind (Kubernetes on Docker) notes

* Kind's default CNI does not currently support Network Policy so you should deploy your own using the instructions on their website.

* If running Kind on top of Docker Desktop, you will need to run a port-forward to access the app.  For example, use something like this: `kubectl port-forward service/goof 8000:80` and then access it via browser at http://localhost:8000/todolist



## Quick cleanup

Run the `/.k8s-quickstop.sh` script at the top level of this repo which will do the following:

1. Deletes the todolist deployment and associated service in the `default` namespace

2. Deletes the log4shell deployment and associated services in the `darkweb` namespace and deltes the namespace as well

   **Note:** This will not delete any additional objects you may have deployed such as NetworkPolicies.



It is up to you to shut down your Kubernetes cluster as appropriate.