Merge pull request #75 from marcel-dempers/admission-controllers

admission-controllers
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# Introduction to Admission controllers
[Admission Webhook](https://kubernetes.io/docs/reference/access-authn-authz/extensible-admission-controllers/#what-are-admission-webhooks)
<hr/>
## Installation (local)
<hr/>
Create a kind cluster:
```
kind create cluster --name webhook --image kindest/node:v1.20.2
```
## TLS certificate notes for Webhook
<hr/>
In order for our webhook to be invoked by Kubernetes, we need a TLS certificate.<br/>
In this demo I'll be using a self signed cert. <br/>
It's ok for development, but for production I would recommend using a real certificate instead. <br/>
We'll use a very handy CloudFlare SSL tool in a docker container to get this done. <br/>
Follow [Use CFSSL to generate certificates](./tls/ssl_generate_self_signed.md)
After the above, we should have: <br/>
* a Webhook YAML file
* CA Bundle for signing new TLS certificates
* a TLS certificate (Kubernetes secret)
<br/>
## Local Development
<hr/>
We always start with a `dockerfile` since we need a Go dev environment.
```
FROM golang:1.15-alpine as dev-env
WORKDIR /app
```
Build and run the controller
```
# get dev environment: webhook
cd sourcecode
docker build . -t webhook
docker run -it --rm -p 80:80 -v ${PWD}:/app webhook sh
```
We always start with Hello world! <br/>
Let's define our basic main module and a web server
```
go mod init example-webhook
```
New file : `main.go`
```
package main
import (
"net/http"
"log"
)
func main() {
http.HandleFunc("/", HandleRoot)
http.HandleFunc("/mutate", HandleMutate)
log.Fatal(http.ListenAndServe(":80", nil))
}
func HandleRoot(w http.ResponseWriter, r *http.Request){
w.Write([]byte("HandleRoot!"))
}
func HandleMutate(w http.ResponseWriter, r *http.Request){
w.Write([]byte("HandleMutate!"))
}
```
Build our code and run it
```
export CGO_ENABLED=0
go build -o webhook
./webhook
```
We'll be able to hit the `http://localhost/mutate` endpoint in the browser <br/>
NOTE: In Windows, container networking is not fully supported. Our container exposes port 80, but to access our Kubernetes cluster which runs in another container, we need to enable `--net host` flag. This means exposing port 80 will stop working from here on <br/>
Let's exit the container and start with `--net host` so our container can access our kubernetes `kind` cluster
```
docker run -it --rm --net host -v ${HOME}/.kube/:/root/.kube/ -v ${PWD}:/app webhook sh
```
We can also test our access to our kubernetes cluster with the config that is mounted in:
```
apk add --no-cache curl
curl -LO https://storage.googleapis.com/kubernetes-release/release/`curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt`/bin/linux/amd64/kubectl
chmod +x ./kubectl
mv ./kubectl /usr/local/bin/kubectl
```
# Kubernetes
How do we interact with Kubernetes ? </br>
Kubernetes provides many libraries and we'll interact with some of these today
Since we'll receive webhook events from Kubernetes, we'll need to translate these
requests into objects or structs that we understand.
For this, the serializer is important:
```
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/serializer"
var (
universalDeserializer = serializer.NewCodecFactory(runtime.NewScheme()).UniversalDeserializer()
)
```
To access Kubernetes, we need to define a config and a client using our config. <br/>
We can authenticate with K8s in a number of ways. <br/>
First way is good for local development and thats using a kubeconfig file. <br/>
For production, we'll use a Kubernetes service account with RBAC permissions. <br/>
We'll do both methods today. <br/>
```
# define our config and client
var config *rest.Config
var clientSet *kubernetes.Clientset
# in main()
useKubeConfig := os.Getenv("USE_KUBECONFIG")
kubeConfigFilePath := os.Getenv("KUBECONFIG")
if len(useKubeConfig) == 0 {
// default to service account in cluster token
c, err := rest.InClusterConfig()
if err != nil {
panic(err.Error())
}
config = c
} else {
//load from a kube config
var kubeconfig string
if kubeConfigFilePath == "" {
if home := homedir.HomeDir(); home != "" {
kubeconfig = filepath.Join(home, ".kube", "config")
}
} else {
kubeconfig = kubeConfigFilePath
}
fmt.Println("kubeconfig: " + kubeconfig)
c, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
if err != nil {
panic(err.Error())
}
config = c
}
```
Once we built our kubeconfig, we can instantiate a client to use in our app:
```
cs, err := kubernetes.NewForConfig(config)
if err != nil {
panic(err.Error())
}
clientSet = cs
```
And we'll need to import the dependencies for this:
```
"os"
"fmt"
"path/filepath"
"k8s.io/client-go/kubernetes"
rest "k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/util/homedir"
```
Since we're also using the client-go library, we need to install the same version as
the other libraries as we can see in the `go.mod` file, we're using `v0.21.0`
```
go get k8s.io/client-go@v0.21.0
```
Rebuild to ensure no errors:
```
go build -o webhook
```
Test with a kubeconfig
```
export USE_KUBECONFIG=true
./webhook
```
To test our access, let's create a `test.go` and return pods from the kube-system namespace
```
#test.go
package main
import ()
func test(){
}
```
Use our global clientset defined in main() and get all pods
```
pods, err := clientSet.CoreV1().Pods("").List(context.TODO(), metav1.ListOptions{})
if err != nil {
panic(err.Error())
}
fmt.Printf("There are %d pods in the cluster\n", len(pods.Items))
```
Define dependencies:
```
"context"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"fmt"
```
And finally invoking it in main() calling `test()` <br/>
Run and test our Kubernetes access:
```
bash-5.0# ./webhook
kubeconfig: /root/.kube/config
There are 11 pods in the cluster
```
## Mutating Webhook
Now that we have a working app that can talk to Kubernetes, lets implement our webhook endpoint and deploy it to kubernetes to see what type of message the API server sends us when events happen
Firstly, we need to enable a TLS endpoint </br>
Let's take some parameters where we can set the path to the TLS certificate and port number to run on. </br>
Import flag dependency:
```
"flag"
"strconv"
```
Define our parameters for cert configuration
```
type ServerParameters struct {
port int // webhook server port
certFile string // path to the x509 certificate for https
keyFile string // path to the x509 private key matching `CertFile`
}
var parameters ServerParameters
# in main()
flag.IntVar(&parameters.port, "port", 8443, "Webhook server port.")
flag.StringVar(&parameters.certFile, "tlsCertFile", "/etc/webhook/certs/tls.crt", "File containing the x509 Certificate for HTTPS.")
flag.StringVar(&parameters.keyFile, "tlsKeyFile", "/etc/webhook/certs/tls.key", "File containing the x509 private key to --tlsCertFile.")
flag.Parse()
# start our web server exposing TLS endpoint
log.Fatal(http.ListenAndServeTLS(":" + strconv.Itoa(parameters.port), parameters.certFile, parameters.keyFile, nil))
```
Let's capture the request coming from Kubernetes and write it to local file for analysis
```
# dependencies
"io/ioutil"
# HandleMutate
body, err := ioutil.ReadAll(r.Body)
err = ioutil.WriteFile("/tmp/request", body, 0644)
if err != nil {
panic(err.Error())
}
```
## Deployment
<hr/>
Let's built what we have and deploy it to our kubernetes cluster
We will firstly need to add a build step to our `dockerfile` to build the code </br>
And we'll also need to create a smaller runtime layer in our `dockerfile`
Full `dockerfile` :
```
FROM golang:1.15-alpine as dev-env
WORKDIR /app
FROM dev-env as build-env
COPY go.mod /go.sum /app/
RUN go mod download
COPY . /app/
RUN CGO_ENABLED=0 go build -o /webhook
FROM alpine:3.10 as runtime
COPY --from=build-env /webhook /usr/local/bin/webhook
RUN chmod +x /usr/local/bin/webhook
ENTRYPOINT ["webhook"]
```
Let's build the container and push it to a registry:
```
docker build . -t aimvector/example-webhook:v1
docker push aimvector/example-webhook:v1
```
```
# apply generated secret
kubectl -n default apply -f ./tls/example-webhook-tls.yaml
kubectl -n default apply -f rbac.yaml
kubectl -n default apply -f deployment.yaml
kubectl -n default get pods
# ensure above pods are running first
kubectl -n default apply -f webhook.yaml
```
# Deploy a demo that needs mutation
```
kubectl -n default apply -f ./demo-pod.yaml
```
We should now be able to see an example request from Kubernetes sitting in our `tmp/request` location. This request is called an "AdmissionReview" <br/>
Kubernetes sends us an `AdmissionReview` and expects an AdmissionResponse back. <br/>
We can copy this review locally and use it for development so we dont need to deploy to
kubernetes constantly. For example:
```
kubectl cp example-webhook-756bcb566b-9kxjp:/tmp/request ./mock-request.json
```
So lets grab the info from the admission request, so we can do something with it
```
//dependencies
"k8s.io/api/admission/v1beta1"
"errors"
//HandleMutate()
var admissionReviewReq v1beta1.AdmissionReview
if _, _, err := universalDeserializer.Decode(body, nil, &admissionReviewReq); err != nil {
w.WriteHeader(http.StatusBadRequest)
fmt.Errorf("could not deserialize request: %v", err)
} else if admissionReviewReq.Request == nil {
w.WriteHeader(http.StatusBadRequest)
errors.New("malformed admission review: request is nil")
}
fmt.Printf("Type: %v \t Event: %v \t Name: %v \n",
admissionReviewReq.Request.Kind,
admissionReviewReq.Request.Operation,
admissionReviewReq.Request.Name,
)
```
# Mutation
Firstly we need to grab the Pod object from the admission request
```
//dependencies
apiv1 "k8s.io/api/core/v1"
var pod apiv1.Pod
err = json.Unmarshal(admissionReviewReq.Request.Object.Raw, &pod)
if err != nil {
fmt.Errorf("could not unmarshal pod on admission request: %v", err)
}
```
To perform a simple mutation on the object before the Kubernetes API sees the object, we can apply a patch to the operation.
```
//global
type patchOperation struct {
Op string `json:"op"`
Path string `json:"path"`
Value interface{} `json:"value,omitempty"`
}
//HandleMutate()
var patches []patchOperation
```
Add a label that we can inject on the pod
We have to craft the kubernetes object we want to patch. <br/>
For example, a label is part of the Metadata API on the Pod spec
https://pkg.go.dev/k8s.io/api/core/v1#Pod
```
// Get existing Metadata labels
labels := pod.ObjectMeta.Labels
labels["example-webhook"] = "it-worked"
patches = append(patches, patchOperation{
Op: "add",
Path: "/metadata/labels",
Value: labels,
})
```
Once you have completed all your patching, convert the patches to byte slice:
```
patchBytes, err := json.Marshal(patches)
if err != nil {
fmt.Errorf("could not marshal JSON patch: %v", err)
}
```
Add it to the admission response
```
admissionReviewResponse := v1beta1.AdmissionReview{
Response: &v1beta1.AdmissionResponse{
UID: admissionReviewReq.Request.UID,
Allowed: true,
},
}
admissionReviewResponse.Response.Patch = patchBytes
bytes, err := json.Marshal(&admissionReviewResponse)
if err != nil {
fmt.Errorf("marshaling response: %v", err)
}
w.Write(bytes)
//dependencies
"encoding/json"
```
# Build and push the updates
```
docker build . -t aimvector/example-webhook:v1
docker push aimvector/example-webhook:v1
```
# Delete all pods to get latest image
```
kubectl delete pods --all
```
# Redeploy our demo pod and see the mutations
```
kubectl -n default apply -f ./demo-pod.yaml
```
See the injected label
```
kubectl get pods --show-labels
```

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apiVersion: v1
kind: Pod
metadata:
name: demo-pod
labels:
example-webhook-enabled: "true"
spec:
containers:
- name: nginx
image: nginx

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apiVersion: v1
kind: Service
metadata:
name: example-webhook
namespace: default
spec:
selector:
app: example-webhook
ports:
- port: 443
targetPort: tls
name: application
- port: 80
targetPort: metrics
name: metrics
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: example-webhook
namespace: default
labels:
app: example-webhook
spec:
replicas: 1
selector:
matchLabels:
app: example-webhook
template:
metadata:
labels:
app: example-webhook
spec:
nodeSelector:
kubernetes.io/os: linux
serviceAccountName: example-webhook
securityContext:
runAsNonRoot: true
runAsUser: 1234
containers:
- name: server
image: aimvector/example-webhook:v1
imagePullPolicy: Always
ports:
- containerPort: 8443
name: tls
- containerPort: 80
name: metrics
volumeMounts:
- name: webhook-tls-certs
mountPath: /etc/webhook/certs/
readOnly: true
volumes:
- name: webhook-tls-certs
secret:
secretName: example-webhook-tls

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{
"kind": "AdmissionReview",
"apiVersion": "admission.k8s.io/v1beta1",
"request": {
"uid": "dffc1f0f-0c0b-4d15-892f-71524ecfd06c",
"kind": {
"group": "",
"version": "v1",
"kind": "Pod"
},
"resource": {
"group": "",
"version": "v1",
"resource": "pods"
},
"requestKind": {
"group": "",
"version": "v1",
"kind": "Pod"
},
"requestResource": {
"group": "",
"version": "v1",
"resource": "pods"
},
"name": "demo-pod",
"namespace": "default",
"operation": "CREATE",
"userInfo": {
"username": "kubernetes-admin",
"groups": [
"system:masters",
"system:authenticated"
]
},
"object": {
"kind": "Pod",
"apiVersion": "v1",
"metadata": {
"name": "demo-pod",
"namespace": "default",
"creationTimestamp": null,
"labels": {
"example-webhook-enabled": "true"
},
"annotations": {
"kubectl.kubernetes.io/last-applied-configuration": "{\"apiVersion\":\"v1\",\"kind\":\"Pod\",\"metadata\":{\"annotations\":{},\"labels\":{\"example-webhook-enabled\":\"true\"},\"name\":\"demo-pod\",\"namespace\":\"default\"},\"spec\":{\"containers\":[{\"image\":\"nginx\",\"name\":\"nginx\"}]}}\n"
},
"managedFields": [
{
"manager": "kubectl.exe",
"operation": "Update",
"apiVersion": "v1",
"time": "2021-04-14T07:47:56Z",
"fieldsType": "FieldsV1",
"fieldsV1": {
"f:metadata": {
"f:annotations": {
".": {},
"f:kubectl.kubernetes.io/last-applied-configuration": {}
},
"f:labels": {
".": {},
"f:example-webhook-enabled": {}
}
},
"f:spec": {
"f:containers": {
"k:{\"name\":\"nginx\"}": {
".": {},
"f:image": {},
"f:imagePullPolicy": {},
"f:name": {},
"f:resources": {},
"f:terminationMessagePath": {},
"f:terminationMessagePolicy": {}
}
},
"f:dnsPolicy": {},
"f:enableServiceLinks": {},
"f:restartPolicy": {},
"f:schedulerName": {},
"f:securityContext": {},
"f:terminationGracePeriodSeconds": {}
}
}
}
]
},
"spec": {
"volumes": [
{
"name": "default-token-4fzpv",
"secret": {
"secretName": "default-token-4fzpv"
}
}
],
"containers": [
{
"name": "nginx",
"image": "nginx",
"resources": {},
"volumeMounts": [
{
"name": "default-token-4fzpv",
"readOnly": true,
"mountPath": "/var/run/secrets/kubernetes.io/serviceaccount"
}
],
"terminationMessagePath": "/dev/termination-log",
"terminationMessagePolicy": "File",
"imagePullPolicy": "Always"
}
],
"restartPolicy": "Always",
"terminationGracePeriodSeconds": 30,
"dnsPolicy": "ClusterFirst",
"serviceAccountName": "default",
"serviceAccount": "default",
"securityContext": {},
"schedulerName": "default-scheduler",
"tolerations": [
{
"key": "node.kubernetes.io/not-ready",
"operator": "Exists",
"effect": "NoExecute",
"tolerationSeconds": 300
},
{
"key": "node.kubernetes.io/unreachable",
"operator": "Exists",
"effect": "NoExecute",
"tolerationSeconds": 300
}
],
"priority": 0,
"enableServiceLinks": true,
"preemptionPolicy": "PreemptLowerPriority"
},
"status": {}
},
"oldObject": null,
"dryRun": false,
"options": {
"kind": "CreateOptions",
"apiVersion": "meta.k8s.io/v1"
}
}
}

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apiVersion: v1
kind: ServiceAccount
metadata:
name: example-webhook
namespace: default
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: example-webhook
rules:
- apiGroups: [""]
resources: ["pods"]
verbs: ["get", "watch", "list"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: example-webhook
subjects:
- kind: ServiceAccount
name: example-webhook
namespace: default
roleRef:
kind: ClusterRole
name: example-webhook
apiGroup: rbac.authorization.k8s.io

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FROM golang:1.15-alpine as dev-env
WORKDIR /app
FROM dev-env as build-env
COPY go.mod /go.sum /app/
RUN go mod download
COPY . /app/
RUN CGO_ENABLED=0 go build -o /webhook
FROM alpine:3.10 as runtime
COPY --from=build-env /webhook /usr/local/bin/webhook
RUN chmod +x /usr/local/bin/webhook
ENTRYPOINT ["webhook"]

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module example-webhook
go 1.15
require (
k8s.io/api v0.21.0
k8s.io/apimachinery v0.21.0
k8s.io/client-go v0.21.0
)

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cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
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github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/objx v0.2.0/go.mod h1:qt09Ya8vawLte6SNmTgCsAVtYtaKzEcn8ATUoHMkEqE=
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golang.org/x/net v0.0.0-20200114155413-6afb5195e5aa/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20200202094626-16171245cfb2/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20200222125558-5a598a2470a0/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20200226121028-0de0cce0169b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20200301022130-244492dfa37a/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
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golang.org/x/net v0.0.0-20210224082022-3d97a244fca7/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
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k8s.io/api v0.21.0 h1:gu5iGF4V6tfVCQ/R+8Hc0h7H1JuEhzyEi9S4R5LM8+Y=
k8s.io/api v0.21.0/go.mod h1:+YbrhBBGgsxbF6o6Kj4KJPJnBmAKuXDeS3E18bgHNVU=
k8s.io/apimachinery v0.21.0 h1:3Fx+41if+IRavNcKOz09FwEXDBG6ORh6iMsTSelhkMA=
k8s.io/apimachinery v0.21.0/go.mod h1:jbreFvJo3ov9rj7eWT7+sYiRx+qZuCYXwWT1bcDswPY=
k8s.io/client-go v0.21.0 h1:n0zzzJsAQmJngpC0IhgFcApZyoGXPrDIAD601HD09ag=
k8s.io/client-go v0.21.0/go.mod h1:nNBytTF9qPFDEhoqgEPaarobC8QPae13bElIVHzIglA=
k8s.io/gengo v0.0.0-20200413195148-3a45101e95ac/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
k8s.io/klog/v2 v2.0.0/go.mod h1:PBfzABfn139FHAV07az/IF9Wp1bkk3vpT2XSJ76fSDE=
k8s.io/klog/v2 v2.8.0 h1:Q3gmuM9hKEjefWFFYF0Mat+YyFJvsUyYuwyNNJ5C9Ts=
k8s.io/klog/v2 v2.8.0/go.mod h1:hy9LJ/NvuK+iVyP4Ehqva4HxZG/oXyIS3n3Jmire4Ec=
k8s.io/kube-openapi v0.0.0-20210305001622-591a79e4bda7/go.mod h1:wXW5VT87nVfh/iLV8FpR2uDvrFyomxbtb1KivDbvPTE=
k8s.io/utils v0.0.0-20201110183641-67b214c5f920 h1:CbnUZsM497iRC5QMVkHwyl8s2tB3g7yaSHkYPkpgelw=
k8s.io/utils v0.0.0-20201110183641-67b214c5f920/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=
rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
sigs.k8s.io/structured-merge-diff/v4 v4.0.2/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
sigs.k8s.io/structured-merge-diff/v4 v4.1.0 h1:C4r9BgJ98vrKnnVCjwCSXcWjWe0NKcUQkmzDXZXGwH8=
sigs.k8s.io/structured-merge-diff/v4 v4.1.0/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
sigs.k8s.io/yaml v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q=
sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=

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@ -0,0 +1,169 @@
package main
import (
"net/http"
"log"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/serializer"
"os"
"fmt"
"path/filepath"
"k8s.io/client-go/kubernetes"
rest "k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/util/homedir"
"flag"
"strconv"
"io/ioutil"
"k8s.io/api/admission/v1beta1"
"errors"
apiv1 "k8s.io/api/core/v1"
"encoding/json"
)
type ServerParameters struct {
port int // webhook server port
certFile string // path to the x509 certificate for https
keyFile string // path to the x509 private key matching `CertFile`
}
type patchOperation struct {
Op string `json:"op"`
Path string `json:"path"`
Value interface{} `json:"value,omitempty"`
}
var parameters ServerParameters
var (
universalDeserializer = serializer.NewCodecFactory(runtime.NewScheme()).UniversalDeserializer()
)
var config *rest.Config
var clientSet *kubernetes.Clientset
func main() {
useKubeConfig := os.Getenv("USE_KUBECONFIG")
kubeConfigFilePath := os.Getenv("KUBECONFIG")
flag.IntVar(&parameters.port, "port", 8443, "Webhook server port.")
flag.StringVar(&parameters.certFile, "tlsCertFile", "/etc/webhook/certs/tls.crt", "File containing the x509 Certificate for HTTPS.")
flag.StringVar(&parameters.keyFile, "tlsKeyFile", "/etc/webhook/certs/tls.key", "File containing the x509 private key to --tlsCertFile.")
flag.Parse()
if len(useKubeConfig) == 0 {
// default to service account in cluster token
c, err := rest.InClusterConfig()
if err != nil {
panic(err.Error())
}
config = c
} else {
//load from a kube config
var kubeconfig string
if kubeConfigFilePath == "" {
if home := homedir.HomeDir(); home != "" {
kubeconfig = filepath.Join(home, ".kube", "config")
}
} else {
kubeconfig = kubeConfigFilePath
}
fmt.Println("kubeconfig: " + kubeconfig)
c, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
if err != nil {
panic(err.Error())
}
config = c
}
cs, err := kubernetes.NewForConfig(config)
if err != nil {
panic(err.Error())
}
clientSet = cs
test()
http.HandleFunc("/", HandleRoot)
http.HandleFunc("/mutate", HandleMutate)
log.Fatal(http.ListenAndServeTLS(":" + strconv.Itoa(parameters.port), parameters.certFile, parameters.keyFile, nil))
}
func HandleRoot(w http.ResponseWriter, r *http.Request){
w.Write([]byte("HandleRoot!"))
}
func HandleMutate(w http.ResponseWriter, r *http.Request){
body, err := ioutil.ReadAll(r.Body)
err = ioutil.WriteFile("/tmp/request", body, 0644)
if err != nil {
panic(err.Error())
}
var admissionReviewReq v1beta1.AdmissionReview
if _, _, err := universalDeserializer.Decode(body, nil, &admissionReviewReq); err != nil {
w.WriteHeader(http.StatusBadRequest)
fmt.Errorf("could not deserialize request: %v", err)
} else if admissionReviewReq.Request == nil {
w.WriteHeader(http.StatusBadRequest)
errors.New("malformed admission review: request is nil")
}
fmt.Printf("Type: %v \t Event: %v \t Name: %v \n",
admissionReviewReq.Request.Kind,
admissionReviewReq.Request.Operation,
admissionReviewReq.Request.Name,
)
var pod apiv1.Pod
err = json.Unmarshal(admissionReviewReq.Request.Object.Raw, &pod)
if err != nil {
fmt.Errorf("could not unmarshal pod on admission request: %v", err)
}
var patches []patchOperation
labels := pod.ObjectMeta.Labels
labels["example-webhook"] = "it-worked"
patches = append(patches, patchOperation{
Op: "add",
Path: "/metadata/labels",
Value: labels,
})
patchBytes, err := json.Marshal(patches)
if err != nil {
fmt.Errorf("could not marshal JSON patch: %v", err)
}
admissionReviewResponse := v1beta1.AdmissionReview{
Response: &v1beta1.AdmissionResponse{
UID: admissionReviewReq.Request.UID,
Allowed: true,
},
}
admissionReviewResponse.Response.Patch = patchBytes
bytes, err := json.Marshal(&admissionReviewResponse)
if err != nil {
fmt.Errorf("marshaling response: %v", err)
}
w.Write(bytes)
}

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@ -0,0 +1,18 @@
package main
import (
"context"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"fmt"
)
func test(){
pods, err := clientSet.CoreV1().Pods("").List(context.TODO(), metav1.ListOptions{})
if err != nil {
panic(err.Error())
}
fmt.Printf("There are %d pods in the cluster\n", len(pods.Items))
}

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@ -0,0 +1,13 @@
{
"signing": {
"default": {
"expiry": "175200h"
},
"profiles": {
"default": {
"usages": ["signing", "key encipherment", "server auth", "client auth"],
"expiry": "175200h"
}
}
}
}

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@ -0,0 +1,18 @@
{
"hosts": [
"cluster.local"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "AU",
"L": "Melbourne",
"O": "Example",
"OU": "CA",
"ST": "Example"
}
]
}

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@ -0,0 +1,8 @@
apiVersion: v1
kind: Secret
metadata:
name: example-webhook-tls
type: Opaque
data:
tls.crt: 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
tls.key: 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@ -0,0 +1,46 @@
# Use CFSSL to generate certificates
More about [CFSSL here]("https://github.com/cloudflare/cfssl")
```
cd kubernetes\admissioncontrollers\introduction
docker run -it --rm -v ${PWD}:/work -w /work debian bash
apt-get update && apt-get install -y curl &&
curl -L https://github.com/cloudflare/cfssl/releases/download/v1.5.0/cfssl_1.5.0_linux_amd64 -o /usr/local/bin/cfssl && \
curl -L https://github.com/cloudflare/cfssl/releases/download/v1.5.0/cfssljson_1.5.0_linux_amd64 -o /usr/local/bin/cfssljson && \
chmod +x /usr/local/bin/cfssl && \
chmod +x /usr/local/bin/cfssljson
#generate ca in /tmp
cfssl gencert -initca ./tls/ca-csr.json | cfssljson -bare /tmp/ca
#generate certificate in /tmp
cfssl gencert \
-ca=/tmp/ca.pem \
-ca-key=/tmp/ca-key.pem \
-config=./tls/ca-config.json \
-hostname="example-webhook,example-webhook.default.svc.cluster.local,example-webhook.default.svc,localhost,127.0.0.1" \
-profile=default \
./tls/ca-csr.json | cfssljson -bare /tmp/example-webhook
#make a secret
cat <<EOF > ./tls/example-webhook-tls.yaml
apiVersion: v1
kind: Secret
metadata:
name: example-webhook-tls
type: Opaque
data:
tls.crt: $(cat /tmp/example-webhook.pem | base64 | tr -d '\n')
tls.key: $(cat /tmp/example-webhook-key.pem | base64 | tr -d '\n')
EOF
#generate CA Bundle + inject into template
ca_pem_b64="$(openssl base64 -A <"/tmp/ca.pem")"
sed -e 's@${CA_PEM_B64}@'"$ca_pem_b64"'@g' <"webhook-template.yaml" \
> webhook.yaml
```

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@ -0,0 +1,24 @@
apiVersion: admissionregistration.k8s.io/v1
kind: MutatingWebhookConfiguration
metadata:
name: example-webhook
webhooks:
- name: example-webhook.default.svc.cluster.local
admissionReviewVersions:
- "v1beta1"
sideEffects: "None"
timeoutSeconds: 30
objectSelector:
matchLabels:
example-webhook-enabled: "true"
clientConfig:
service:
name: example-webhook
namespace: default
path: "/mutate"
caBundle: "${CA_PEM_B64}"
rules:
- operations: [ "CREATE" ]
apiGroups: [""]
apiVersions: ["v1"]
resources: ["pods"]

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@ -0,0 +1,24 @@
apiVersion: admissionregistration.k8s.io/v1
kind: MutatingWebhookConfiguration
metadata:
name: example-webhook
webhooks:
- name: example-webhook.default.svc.cluster.local
admissionReviewVersions:
- "v1beta1"
sideEffects: "None"
timeoutSeconds: 30
objectSelector:
matchLabels:
example-webhook-enabled: "true"
clientConfig:
service:
name: example-webhook
namespace: default
path: "/mutate"
caBundle: "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"
rules:
- operations: [ "CREATE" ]
apiGroups: [""]
apiVersions: ["v1"]
resources: ["pods"]