diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..267aea7 --- /dev/null +++ b/Dockerfile @@ -0,0 +1,40 @@ +FROM golang:1.16-buster as builder + +WORKDIR /app + +COPY go.mod go.sum ./ + +RUN go mod download + +COPY . . + +RUN make bin/pc + +FROM debian:buster-slim + +ARG VERSION=0.0.1 +ARG BUILD_DATE=2021-05-1 + +LABEL \ + org.opencontainers.image.created="$BUILD_DATE" \ + org.opencontainers.image.authors="edvin.norling@gmail.com" \ + org.opencontainers.image.homepage="https://github.com/NissesSenap/falcosidekick-tekton" \ + org.opencontainers.image.documentation="https://github.com/NissesSenap/falcosidekick-tekton" \ + org.opencontainers.image.source="https://github.com/NissesSenap/falcosidekick-tekton" \ + org.opencontainers.image.version="$VERSION" \ + org.opencontainers.image.vendor="GitHub" \ + org.opencontainers.image.licenses="MIT" \ + summary="Kubernetes response Engine deletes pods after commands from falcosidekick" \ + description="Kubernetes response Engine delete pods is meant to be run inside k8s and delete pods after getting instructions from falcosidekick." \ + name="podDeleter" + +RUN apt-get update && apt-get upgrade -y \ + && rm -rf /var/lib/apt/lists/* + +USER 1001 + +WORKDIR /app + +COPY --from=builder /app/bin/poddeleter . + +CMD ["/app/poddeleter"] diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..093939b --- /dev/null +++ b/LICENSE @@ -0,0 +1,21 @@ +MIT License + +Copyright (c) 2021 Edvin N + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..fd171d8 --- /dev/null +++ b/Makefile @@ -0,0 +1,28 @@ +BUILD_FILES = $(shell go list -f '{{range .GoFiles}}{{$$.Dir}}/{{.}}\ +{{end}}' ./...) + +GH_VERSION ?= $(shell git describe --tags 2>/dev/null || git rev-parse --short HEAD) +DATE_FMT = +%Y-%m-%d +BUILD_DATE = $(shell date "$(DATE_FMT)") +IMAGE_REPO = "quay.io/nissessenap/poddeleter" + +print-% : ; @echo $* = $($*) + +bin/pc: $(BUILD_FILES) + @go build -trimpath -o bin/poddeleter ./main.go + +bin/container: + docker build --build-arg BUILD_DATE=$(BUILD_DATE) --build-arg VERSION=$(GH_VERSION) . -t $(IMAGE_REPO):$(GH_VERSION) +.PHONY: bin/container + +bin/push: + docker push $(IMAGE_REPO):$(GH_VERSION) +.PHONY: bin/push + +clean: + rm -rf ./bin ./share +.PHONY: clean + +test: + go test ./... +.PHONY: test diff --git a/NOTES.md b/NOTES.md new file mode 100644 index 0000000..b1d2b19 --- /dev/null +++ b/NOTES.md @@ -0,0 +1,16 @@ +# Ideas + +## TODO + +- Create a super simple go app that works with the incoming data. + - probably just a single body for now, then discuss with falco community. +- Create a Dockerfile +- Push dockerfile to quay.io +- Verify e2e workflow + +## Output example + +This is how I can easily test my go application. +This output is from a command that is not okay in falco. + +export BODY='{"output":"17:30:51.428027354: Notice A shell was spawned in a container with an attached terminal (user=root user_loginuid=-1 k8s.ns=falcoresponse k8s.pod=alpine container=ac7c5359a04b shell=sh parent=runc cmdline=sh -c cat /etc/resolv.conf terminal=34816 container_id=ac7c5359a04b image=alpine) k8s.ns=falcoresponse k8s.pod=alpine container=ac7c5359a04b k8s.ns=falcoresponse k8s.pod=alpine container=ac7c5359a04b","priority":"Notice","rule":"Terminal shell in container","time":"2021-05-02T17:30:51.428027354Z", "output_fields": {"container.id":"ac7c5359a04b","container.image.repository":"alpine","evt.time":1619976651428027354,"k8s.ns.name":"falcoresponse","k8s.pod.name":"alpine","proc.cmdline":"sh -c cat /etc/resolv.conf","proc.name":"sh","proc.pname":"runc","proc.tty":34816,"user.loginuid":-1,"user.name":"root"}}' diff --git a/README.md b/README.md new file mode 100644 index 0000000..8099b5e --- /dev/null +++ b/README.md @@ -0,0 +1,599 @@ +# Falcosidekick + Tekton + +If you follow the Falco blog you have been able to see a recent blog post about "Kubernetes Response Engine". + +In those blogs two different serverless runtimes is used, [Kubeless](https://kubeless.io/) and [OpenFaas](https://www.openfaas.com/). +The blogs describes how you can trigger a pod after getting input from faclosidekick to kill a compromised pod. +My plan with this blog is to showcase how we can do the same thing but with [Tekton](https://tekton.dev) and not have to add any extra complexity to your cluster by adding a serverless runtime. + +I won't go through how Tekton works in depth but, you can find a good overview in the [official docs](https://tekton.dev/docs/overview/). +But here is the crash course: + +- Tekton is built to be reusable. +- The smallest part of tekton is a **step**, a step can be something like this: + - Run unit tests + - Run linting +- In a **task** you can have multiple steps. +- A **pipeline** consist of one or multiple tasks. +- To trigger a pipeline to actually run you need a **pipelinerun** or a **trigger-template**. + +Tekton also supports eventlisterners that is used to listen for webhooks. +Normally these webhooks listen for incoming changes to a git repo, for example a PR. +But we will use it to listen for Falco events. + +You can find all the yaml and code in my [gitrepo](https://github.com/NissesSenap/falcosidekick-tekton). + +## Prerequisites + +As always within Kubernetes we need a few tools, I have used the following versions of Helm, Minikube and kubectl in my setup. + +- Minikube v1.19.0 +- Helm v3.4.2 +- kubectl v1.20.5 + +## Provision local Kubernetes Cluster + +I'm sure you can use a [kind](https://github.com/kubernetes-sigs/kind) cluster as well to follow along, +but falco complained a bit when I tried and I was to lazy to check out what extra flags I need so I went with minikube. + +```shell +minikube start --cpus 3 --memory 8192 --vm-driver virtualbox +``` + +## Install Tekton + +Install Tekton pipelines and triggers. +When doing this in production I recommend the [Tekton operator](https://github.com/tektoncd/operator) but for now lets use some pure yaml. + +```shell +kubectl apply --filename https://storage.googleapis.com/tekton-releases/pipeline/latest/release.yaml +kubectl apply --filename https://storage.googleapis.com/tekton-releases/triggers/latest/release.yaml + +``` + +Within a few seconds you should be able to see a few pods in the tekton-pipelines namespace. + +```shell +kubectl get pods -n tekton-pipelines +NAME READY STATUS RESTARTS AGE +tekton-pipelines-controller-6b94f5f96-cmf8m 1/1 Running 0 1h +tekton-pipelines-webhook-5bfbbd6475-fmjp4 1/1 Running 0 1h +tekton-triggers-controller-7cbd49fbb8-p4lrz 1/1 Running 0 1h +tekton-triggers-webhook-748fb7778c-w6zxv 1/1 Running 0 1h +``` + +If you want a deeper understanding how Tekton triggers work check out the [getting-started guide](https://github.com/tektoncd/triggers/tree/v0.13.0/docs/getting-started). + +## Install Falco + Falcosidekick + +Create the falco namespace and add the helm repo: + +```shell +kubectl create namespace falco +helm repo add falcosecurity https://falcosecurity.github.io/charts +helm repo update +``` + +For simplicity and long term usability lets create a custom values file and start falco. + +```shell +cat <<'EOF' >> values.yaml +falcosidekick: + config: + webhook: + address: http://el-falco-listener.falcoresponse.svc.cluster.local:8080 + customHeaders: Falcon:true\,Stuff:yes + enabled: true + +customRules: + # Applications which are expected to communicate with the Kubernetes API + rules_user_known_k8s_api_callers.yaml: |- + - macro: user_known_contact_k8s_api_server_activities + condition: > + (container.image.repository = "gcr.io/tekton-releases/github.com/tektoncd/triggers/cmd/eventlistenersink") or + (container.image.repository = "quay.io/nissessenap/poddeleter") +EOF + +# Install falco +helm upgrade --install falco falcosecurity/falco --namespace falco -f values.yaml +``` + +> Note the customRules and the webhook address. + +We haven't setup this webhook address nor is there currently any reason for us to have customRules for eventlistenersink or poddeleter, but it will come. +Both the Tekton event listener and my poddeleter does a few kubernetes API calls and we don't want falco generate alarms for our own infrastructure. + +You should be able to see falco and falcosidekick pods in the falco namespace: + +```shell +kubectl get pods --namespace falco + +NAME READY STATUS RESTARTS AGE +falco-44p4v 1/1 Running 0 64m +falco-falcosidekick-779b87f446-8zf9m 1/1 Running 0 2h +falco-falcosidekick-779b87f446-fdk55 1/1 Running 0 2h +``` + +## Protect me Falco + +My current setup is rather harsh and will delete any pods that breaks any falco rule. +In the future I plan to make both the go code and the tekton setup better and more flexible, hopefully this is something that we can do in the community. + +During this demo I will use the [Terminal Shell in container](https://github.com/falcosecurity/falco/blob/0d7068b048772b1e2d3ca5c86c30b3040eac57df/rules/falco_rules.yaml#L2063) since it's very easy to reproduce. + +So how does all this work? + +- We start a random pod and perform a simple exec. +- Falco will notice that a pod have broken the rule +- Sends a event to Falcosidekick +- Sends a webhook to tekton event-listener +- Tekton triggers a new pipeline +- A task is started with a small go program that deletes the pod + +So lets look at some yaml. + +### The go code + +I have adapted the code that Batuhan Apaydın wrote in [Falcosidekick + OpenFaas = a Kubernetes Response Engine, Part 2](https://falco.org/blog/falcosidekick-openfaas/) to listen for json in a environment variable instead of a http request. + +Below you can see the code, in short it does the following: + +- Check for environment variable BODY. +- Unmarshal the data according to the Alert struct. +- Setups a kubernetes client, by calling setupKubeClient function. +- Calls the deletePod with a kubernetes client, the falcoEvent we gotten and a hash map of critical Namespaces. +- Check in the event that we got from falcosidekick and see if the pod that triggered the event is in our critical namespaces hash map. +- If it is return to the main and shutdown the application. +- Else deletes the pod in the namespace specified in the falcosidekick event. + +```main.go +package main + +import ( + "context" + "encoding/json" + "log" + "os" + "time" + + metaV1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/client-go/kubernetes" + "k8s.io/client-go/rest" +) + +// Alert falco data structure +type Alert struct { + Output string `json:"output"` + Priority string `json:"priority"` + Rule string `json:"rule"` + Time time.Time `json:"time"` + OutputFields struct { + ContainerID string `json:"container.id"` + ContainerImageRepository interface{} `json:"container.image.repository"` + ContainerImageTag interface{} `json:"container.image.tag"` + EvtTime int64 `json:"evt.time"` + FdName string `json:"fd.name"` + K8SNsName string `json:"k8s.ns.name"` + K8SPodName string `json:"k8s.pod.name"` + ProcCmdline string `json:"proc.cmdline"` + } `json:"output_fields"` +} + +func main() { + criticalNamespaces := map[string]bool{ + "kube-system": true, + "kube-public": true, + "kube-node-lease": true, + "falco": true, + } + + var falcoEvent Alert + + bodyReq := os.Getenv("BODY") + if bodyReq == "" { + log.Fatalf("Need to get environment variable BODY") + } + bodyReqByte := []byte(bodyReq) + err := json.Unmarshal(bodyReqByte, &falcoEvent) + if err != nil { + log.Fatalf("The data doesent match the struct %v", err) + } + + kubeClient, err := setupKubeClient() + if err != nil { + log.Fatalf("Unable to create in-cluster config: %v", err) + } + + err = deletePod(kubeClient, falcoEvent, criticalNamespaces) + if err != nil { + log.Fatalf("Unable to delete pod due to err %v", err) + } +} + +// setupKubeClient +func setupKubeClient() (*kubernetes.Clientset, error) { + config, err := rest.InClusterConfig() + if err != nil { + return nil, err + } + + // creates the clientset + kubeClient, err := kubernetes.NewForConfig(config) + if err != nil { + return nil, err + } + return kubeClient, nil +} + +// deletePod, if not part of the criticalNamespaces the pod will be deleted +func deletePod(kubeClient *kubernetes.Clientset, falcoEvent Alert, criticalNamespaces map[string]bool) error { + podName := falcoEvent.OutputFields.K8SPodName + namespace := falcoEvent.OutputFields.K8SNsName + log.Printf("PodName: %v & Namespace: %v", podName, namespace) + + log.Printf("Rule: %v", falcoEvent.Rule) + if criticalNamespaces[namespace] { + log.Printf("The pod %v won't be deleted due to it's part of the critical ns list: %v ", podName, namespace) + return nil + } + + log.Printf("Deleting pod %s from namespace %s", podName, namespace) + err := kubeClient.CoreV1().Pods(namespace).Delete(context.Background(), podName, metaV1.DeleteOptions{}) + if err != nil { + return err + } + return nil +} +``` + +If you rather see it in [github](https://raw.githubusercontent.com/NissesSenap/falcosidekick-tekton/main/main.go). + +Now that you know what I will make run in your cluster lets take a look at the Tekton yaml. + +### Tekton pipeline + +Create the falcoresponse namespace to do our tests in. + +```shell +kubectl create ns falcoresponse +``` + +#### Task + +So lets start with the smallest part, the task. + +```shell +cat < I cannot stress this enough DO **NOT** MAKE THE EVENT LISTENER PUBLIC TO THE INTERNET. +We haven't added any protection and this task have the power to kill pods in your cluster. Don't give a potential hacker this power! + +The event listener is rather complex and can do [allot](https://tekton.dev/docs/triggers/eventlisteners/). +For example one way to improve this tekton pipeline could be to check for a specific Priority from Falco. +This could be done with a [cel interceptor](https://tekton.dev/docs/triggers/eventlisteners/#cel-interceptors) +and filter on body.Priority. + +But for now lets just trigger on everything. + +The triggerBinding lets you define what data should be gathered from the incoming webhook. +In this case I take the entire request body. + +```shell +cat < Notice the [annotations](https://tekton.dev/docs/triggers/triggertemplates/#escaping-quoted-strings), without it the pipeline will never get triggered. + +We define the serviceAccount to use in our pipeline/task, point to the pipeline that we should use. +And what parameter to send down to the pipeline, notice the **tt** in front of parma. This is special syntax for TriggerBindings. + +The triggerTemplate was the final pice needed and you should see a pod spinning up in the falcoresponse namespace. + +```shell +kubectl get pdos -n falcoresponse +NAME READY STATUS RESTARTS AGE +el-falco-listener-557786f598-zdmw2 1/1 Running 0 2h +``` + +## Trigger job + +Finally it's time to test our setup. + +I would recommend that you start a second terminal for this part. + +**Terminal 1** follow the falco logs: + +```shell +kubectl logs -f $(kubectl get pods -l app=falco -o jsonpath="{.items[0].metadata.name}" -n falco) -n falco +``` + +**Terminal 2** lets trigger the Terminal Shell in container falco rule + +```shell +# Start a alpine pod +kubectl run alpine --namespace falcoresponse --image=alpine --restart='Never' -- sh -c "sleep 600" +# Trigger the rule breaking behavior +kubectl exec -i --tty alpine --namespace falcoresponse -- sh -c "uptime" +# Watch for pods in falcoresponse namespace +kubectl get pods -n falcoresponse -w +``` + +In **Terminal 1** you should see something like this: + +```txt +* Setting up /usr/src links from host +* Running falco-driver-loader for: falco version=0.28.0, driver version=5c0b863ddade7a45568c0ac97d037422c9efb750 +* Running falco-driver-loader with: driver=module, compile=yes, download=yes +* Unloading falco module, if present +* Trying to load a system falco module, if present +* Success: falco module found and loaded with modprobe +Sun May 2 18:00:10 2021: Falco version 0.28.0 (driver version 5c0b863ddade7a45568c0ac97d037422c9efb750) +Sun May 2 18:00:10 2021: Falco initialized with configuration file /etc/falco/falco.yaml +Sun May 2 18:00:10 2021: Loading rules from file /etc/falco/falco_rules.yaml: +Sun May 2 18:00:10 2021: Loading rules from file /etc/falco/falco_rules.local.yaml: +Sun May 2 18:00:10 2021: Loading rules from file /etc/falco/rules.d/rules_user_known_k8s_api_callers.yaml: +Sun May 2 18:00:10 2021: Starting internal webserver, listening on port 8765 +{"output":"20:24:10.361728219: Notice A shell was spawned in a container with an attached terminal (user=root user_loginuid=-1 k8s.ns=falcoresponse k8s.pod=alpine container=6ac7d190134e shell=sh parent=runc cmdline=sh -c uptime terminal=34816 container_id=6ac7d190134e image=alpine) k8s.ns=falcoresponse k8s.pod=alpine container=6ac7d190134e k8s.ns=falcoresponse k8s.pod=alpine container=6ac7d190134e","priority":"Notice","rule":"Terminal shell in container","time":"2021-05-02T20:24:10.361728219Z", "output_fields": {"container.id":"6ac7d190134e","container.image.repository":"alpine","evt.time":1619987050361728219,"k8s.ns.name":"falcoresponse","k8s.pod.name":"alpine","proc.cmdline":"sh -c uptime","proc.name":"sh","proc.pname":"runc","proc.tty":34816,"user.loginuid":-1,"user.name":"root"}} +``` + +In **Terminal 2** you should see a pod starting and hopefully Complete without any errors and the alpine pod getting killed. + +```shell +NAME READY STATUS RESTARTS AGE +alpine 0/1 Terminating 0 1m7s +el-falco-listener-557786f598-znzk9 1/1 Running 0 10m +falco-pod-delete-pipeline-run-w2vf8-run-pod-delete-jlxl7--mk44k 0/1 Completed 0 59s + +``` + +> Hurray our "hacked" pod have been killed + +If you look in the logs of the task + +```shell +kubectl logs -f $(kubectl get pods -l tekton.dev/task=pod-delete -o jsonpath="{.items[0].metadata.name}" -n falcoresponse) -n falcoresponse +2021/05/02 18:11:00 PodName: alpine & Namespace: falcoresponse +2021/05/02 18:11:00 Rule: Terminal shell in container +2021/05/02 18:11:00 Deleting pod alpine from namespace falcoresponse +``` + +## Conclusion + +This was a rather simple example on how we can use the power of tekton together with Falco to protect us from bad actors that is trying to take over pods in our cluster. + +As noted during this post there are allot of potential improvements before this is production ready: + +- The criticalNamepsaces in our go code is currently hard-coded and needs to be input variable of some kind. +- We need to be able to delete pods depending on priority level, rule or something similar. +- To be able to debug pods we might need to shell in to them, we need a way to ignore pods temporary without the pod getting restarted. Probably a annotation to look for in the pod before deleting it. +- And probably many other needs that you can come up with. + +If you have any ideas/issues come and share them in the falco slack [https://kubernetes.slack.com](https://kubernetes.slack.com) #falco. diff --git a/falco/values.yaml b/falco/values.yaml new file mode 100644 index 0000000..1dc562e --- /dev/null +++ b/falco/values.yaml @@ -0,0 +1,15 @@ +falcosidekick: + config: + webhook: + address: http://el-falco-listener.falcoresponse.svc.cluster.local:8080 + customHeaders: Falcon:true\,Stuff:yes + enabled: true + + +customRules: + # Applications which are expected to communicate with the Kubernetes API + rules_user_known_k8s_api_callers.yaml: |- + - macro: user_known_contact_k8s_api_server_activities + condition: > + (container.image.repository = "gcr.io/tekton-releases/github.com/tektoncd/triggers/cmd/eventlistenersink") or + (container.image.repository = "quay.io/nissessenap/poddeleter") diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..16b9016 --- /dev/null +++ b/go.mod @@ -0,0 +1,8 @@ +module github.com/NissesSenap/falcosidekick-tekton + +go 1.16 + +require ( + k8s.io/apimachinery v0.21.0 + k8s.io/client-go v0.21.0 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..0e1211a --- /dev/null +++ b/go.sum @@ -0,0 +1,428 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= +cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU= +cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY= +cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc= +cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0= +cloud.google.com/go v0.50.0/go.mod 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v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q= +sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc= diff --git a/main.go b/main.go new file mode 100644 index 0000000..06a3b7d --- /dev/null +++ b/main.go @@ -0,0 +1,97 @@ +package main + +import ( + "context" + "encoding/json" + "log" + "os" + "time" + + metaV1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/client-go/kubernetes" + "k8s.io/client-go/rest" +) + +// Alert falco data structure +type Alert struct { + Output string `json:"output"` + Priority string `json:"priority"` + Rule string `json:"rule"` + Time time.Time `json:"time"` + OutputFields struct { + ContainerID string `json:"container.id"` + ContainerImageRepository interface{} `json:"container.image.repository"` + ContainerImageTag interface{} `json:"container.image.tag"` + EvtTime int64 `json:"evt.time"` + FdName string `json:"fd.name"` + K8SNsName string `json:"k8s.ns.name"` + K8SPodName string `json:"k8s.pod.name"` + ProcCmdline string `json:"proc.cmdline"` + } `json:"output_fields"` +} + +func main() { + criticalNamespaces := map[string]bool{ + "kube-system": true, + "kube-public": true, + "kube-node-lease": true, + "falco": true, + } + + var falcoEvent Alert + + bodyReq := os.Getenv("BODY") + if bodyReq == "" { + log.Fatalf("Need to get environment variable BODY") + } + bodyReqByte := []byte(bodyReq) + err := json.Unmarshal(bodyReqByte, &falcoEvent) + if err != nil { + log.Fatalf("The data doesent match the struct %v", err) + } + + kubeClient, err := setupKubeClient() + if err != nil { + log.Fatalf("Unable to create in-cluster config: %v", err) + } + + err = deletePod(kubeClient, falcoEvent, criticalNamespaces) + if err != nil { + log.Fatalf("Unable to delete pod due to err %v", err) + } +} + +// setupKubeClient +func setupKubeClient() (*kubernetes.Clientset, error) { + config, err := rest.InClusterConfig() + if err != nil { + return nil, err + } + + // creates the clientset + kubeClient, err := kubernetes.NewForConfig(config) + if err != nil { + return nil, err + } + return kubeClient, nil +} + +// deletePod, if not part of the criticalNamespaces the pod will be deleted +func deletePod(kubeClient *kubernetes.Clientset, falcoEvent Alert, criticalNamespaces map[string]bool) error { + podName := falcoEvent.OutputFields.K8SPodName + namespace := falcoEvent.OutputFields.K8SNsName + log.Printf("PodName: %v & Namespace: %v", podName, namespace) + + log.Printf("Rule: %v", falcoEvent.Rule) + if criticalNamespaces[namespace] { + log.Printf("The pod %v won't be deleted due to it's part of the critical ns list: %v ", podName, namespace) + return nil + } + + log.Printf("Deleting pod %s from namespace %s", podName, namespace) + err := kubeClient.CoreV1().Pods(namespace).Delete(context.Background(), podName, metaV1.DeleteOptions{}) + if err != nil { + return err + } + return nil +} diff --git a/tekton/eventlistener.yaml b/tekton/eventlistener.yaml new file mode 100644 index 0000000..9be17a1 --- /dev/null +++ b/tekton/eventlistener.yaml @@ -0,0 +1,14 @@ +--- +apiVersion: triggers.tekton.dev/v1alpha1 +kind: EventListener +metadata: + name: falco-listener + namespace: falcoresponse +spec: + serviceAccountName: tekton-triggers-example-sa + triggers: + - name: cel-trig + bindings: + - ref: falco-pod-delete-binding + template: + ref: falco-pod-delete-trigger-template diff --git a/tekton/pipeline.yaml b/tekton/pipeline.yaml new file mode 100644 index 0000000..41abb8b --- /dev/null +++ b/tekton/pipeline.yaml @@ -0,0 +1,17 @@ +--- +apiVersion: tekton.dev/v1beta1 +kind: Pipeline +metadata: + name: pod-delete-pipeline + namespace: falcoresponse +spec: + params: + - name: falco-event + description: The entire msg from falco + tasks: + - name: run-pod-delete + taskRef: + name: pod-delete + params: + - name: falco-event + value: $(params.falco-event) diff --git a/tekton/pipelinerun.yaml b/tekton/pipelinerun.yaml new file mode 100644 index 0000000..de50834 --- /dev/null +++ b/tekton/pipelinerun.yaml @@ -0,0 +1,13 @@ +--- +apiVersion: tekton.dev/v1beta1 +kind: PipelineRun +metadata: + generateName: pod-delete-run- + namespace: falcoresponse +spec: + serviceAccountName: falco-pod-delete + pipelineRef: + name: pod-delete-pipeline + params: + - name: falco-event + value: "afalcoevent" diff --git a/tekton/rbac-event-listener.yaml b/tekton/rbac-event-listener.yaml new file mode 100644 index 0000000..39ccaee --- /dev/null +++ b/tekton/rbac-event-listener.yaml @@ -0,0 +1,68 @@ +--- +apiVersion: v1 +kind: ServiceAccount +metadata: + name: tekton-triggers-example-sa + namespace: falcoresponse +--- +apiVersion: rbac.authorization.k8s.io/v1 +kind: Role +metadata: + name: tekton-triggers-example-minimal + namespace: falcoresponse +rules: + # EventListeners need to be able to fetch all namespaced resources + - apiGroups: ["triggers.tekton.dev"] + resources: + ["eventlisteners", "triggerbindings", "triggertemplates", "triggers"] + verbs: ["get", "list", "watch"] + - apiGroups: [""] + # configmaps is needed for updating logging config + resources: ["configmaps"] + verbs: ["get", "list", "watch"] + # Permissions to create resources in associated TriggerTemplates + - apiGroups: ["tekton.dev"] + resources: ["pipelineruns", "pipelineresources", "taskruns"] + verbs: ["create"] + - apiGroups: [""] + resources: ["serviceaccounts"] + verbs: ["impersonate"] + - apiGroups: ["policy"] + resources: ["podsecuritypolicies"] + resourceNames: ["tekton-triggers"] + verbs: ["use"] +--- +apiVersion: rbac.authorization.k8s.io/v1 +kind: RoleBinding +metadata: + name: tekton-triggers-example-binding +subjects: + - kind: ServiceAccount + name: tekton-triggers-example-sa +roleRef: + apiGroup: rbac.authorization.k8s.io + kind: Role + name: tekton-triggers-example-minimal +--- +kind: ClusterRole +apiVersion: rbac.authorization.k8s.io/v1 +metadata: + name: tekton-triggers-example-clusterrole +rules: + # EventListeners need to be able to fetch any clustertriggerbindings + - apiGroups: ["triggers.tekton.dev"] + resources: ["clustertriggerbindings", "clusterinterceptors"] + verbs: ["get", "list", "watch"] +--- +apiVersion: rbac.authorization.k8s.io/v1 +kind: ClusterRoleBinding +metadata: + name: tekton-triggers-example-clusterbinding +subjects: + - kind: ServiceAccount + name: tekton-triggers-example-sa + namespace: falcoresponse +roleRef: + apiGroup: rbac.authorization.k8s.io + kind: ClusterRole + name: tekton-triggers-example-clusterrole diff --git a/tekton/rbac-falco-task.yaml b/tekton/rbac-falco-task.yaml new file mode 100644 index 0000000..ebbed94 --- /dev/null +++ b/tekton/rbac-falco-task.yaml @@ -0,0 +1,28 @@ +--- +apiVersion: v1 +kind: ServiceAccount +metadata: + name: falco-pod-delete + namespace: falcoresponse +--- +kind: ClusterRole +apiVersion: rbac.authorization.k8s.io/v1 +metadata: + name: falco-pod-delete-cluster-role +rules: + - apiGroups: [""] + resources: ["pods"] + verbs: ["get", "list", "delete"] +--- +kind: ClusterRoleBinding +apiVersion: rbac.authorization.k8s.io/v1 +metadata: + name: falco-pod-delete-cluster-role-binding +roleRef: + kind: ClusterRole + name: falco-pod-delete-cluster-role + apiGroup: rbac.authorization.k8s.io +subjects: + - kind: ServiceAccount + name: falco-pod-delete + namespace: falcoresponse diff --git a/tekton/task.yaml b/tekton/task.yaml new file mode 100644 index 0000000..57e86ed --- /dev/null +++ b/tekton/task.yaml @@ -0,0 +1,16 @@ +--- +apiVersion: tekton.dev/v1beta1 +kind: Task +metadata: + name: pod-delete + namespace: falcoresponse +spec: + params: + - name: falco-event + description: The entire msg from falco + steps: + - name: pod-delete + image: quay.io/nissessenap/poddeleter@sha256:ae94ec2c9f005573e31e4944d1055a0dd92ee7594e7e7e36a4540a1811977270 + env: + - name: BODY + value: $(params.falco-event) diff --git a/tekton/trigger-bindings.yaml b/tekton/trigger-bindings.yaml new file mode 100644 index 0000000..8e0aec7 --- /dev/null +++ b/tekton/trigger-bindings.yaml @@ -0,0 +1,10 @@ +--- +apiVersion: triggers.tekton.dev/v1alpha1 +kind: TriggerBinding +metadata: + name: falco-pod-delete-binding + namespace: falcoresponse +spec: + params: + - name: falco-event + value: $(body) diff --git a/tekton/trigger-template.yaml b/tekton/trigger-template.yaml new file mode 100644 index 0000000..a03551f --- /dev/null +++ b/tekton/trigger-template.yaml @@ -0,0 +1,24 @@ +--- +apiVersion: triggers.tekton.dev/v1alpha1 +kind: TriggerTemplate +metadata: + name: falco-pod-delete-trigger-template + namespace: falcoresponse + annotations: + triggers.tekton.dev/old-escape-quotes: "true" +spec: + params: + - name: falco-event + description: The entire msg from falco + resourcetemplates: + - apiVersion: tekton.dev/v1beta1 + kind: PipelineRun + metadata: + generateName: falco-pod-delete-pipeline-run- + spec: + serviceAccountName: falco-pod-delete + pipelineRef: + name: pod-delete-pipeline + params: + - name: falco-event + value: $(tt.params.falco-event)