forked from TrueCloudLab/certificates
autocert
This commit is contained in:
Mike Malone
parent
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commit
042e36da65
12 changed files with 1520 additions and 0 deletions
132
autocert/INSTALL.md
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132
autocert/INSTALL.md
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### Create a CA
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Set your `STEPPATH` to a working directory where we can stage our CA artifacts before we push them to kubernetes. You can delete this directory once installation is complete.
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```
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$ export STEPPATH=$(mktemp -d /tmp/step.XXX)
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$ step path
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/tmp/step.0kE
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```
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Run `step ca init` to generate a root certificate and CA configuration for your cluster. You'll be prompted for a password that will be used to encrypt key material.
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```
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$ step ca init \
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--name Autocert \
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--dns "ca.step.svc.cluster.local,127.0.0.1" \
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--address ":4443" \
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--provisioner admin \
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--with-ca-url "ca.step.svc.cluster.local"
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```
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For older versions of `step` run this command without the flags.
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Add provisioning credentials for use by `autocert`. You'll be prompted for a password for `autocert`.
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```
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$ step ca provisioner add autocert --create
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```
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For older versions of `step`:
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* Run `step ca init` and follow prompts
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* Edit `$(step path)/config/ca.json` and change base paths to `/home/step`
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* Edit `$(step path)/config/defaults.json` to change base paths to `/home/step` and remove port from CA URL
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```
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$ sed -i "" "s|$(step path)|/home/step/.step|g" $(step path)/config/ca.json
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$ sed -i "" "s|$(step path)|/home/step/.step|g" $(step path)/config/defaults.json
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$ sed -i "" "s|ca.step.svc.cluster.local:4443|ca.step.svc.cluster.local|" $(step path)/config/defaults.json
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```
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### Install the CA in Kubernetes
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We'll install our CA and the `autocert` controller in the `step` namespace.
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```
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$ kubectl create namespace step
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```
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To install the CA we need to configmap the CA certificates, signing keys, and configuration artifacts. Note that key material is encrypted so we don't need to use secrets.
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```
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$ kubectl -n step create configmap config --from-file $(step path)/config
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$ kubectl -n step create configmap certs --from-file $(step path)/certs
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$ kubectl -n step create configmap secrets --from-file $(step path)/secrets
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```
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But we will need to create secrets for the CA and autocert to decrypt their keys:
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```
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$ kubectl -n step create secret generic ca-password --from-literal password=<ca-password>
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$ kubectl -n step create secret generic autocert-password --from-literal password=<autocert-password>
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```
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Where `<ca-password>` is the password you entered during `step ca init` and `<autocert-password>` is the password you entered during `step ca provisioner add`.
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Next, we'll install the CA.
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```
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$ kubectl apply -f https://raw.githubusercontent.com/smallstep/certificates/master/autocert/install/01-step-ca.yaml
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```
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Once you've done this you can delete the temporary `$STEPPATH` directory and `unset STEPPATH` (though you may want to retain it as a backup).
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### Install `autocert` in Kubernetes
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Install the `autocert` controller.
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```
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$ kubectl apply -f https://raw.githubusercontent.com/smallstep/certificates/master/autocert/install/02-autocert.yaml
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```
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Autocert creates secrets containing single-use bootstrap tokens for pods to authenticate with the CA and obtain a certificate. The tokens are automatically cleaned up after they expire. To do this, `autocert` needs permission to create and delete secrets in your cluster.
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If you have RBAC enabled in your cluster, apply `rbac.yaml` to give `autocert` these permissions.
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```
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$ kubectl apply -f https://raw.githubusercontent.com/smallstep/certificates/master/autocert/install/03-rbac.yaml
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```
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Finally, register the `autocert` mutation webhook with kubernetes.
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```
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$ cat <<EOF | kubectl apply -f -
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apiVersion: admissionregistration.k8s.io/v1beta1
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kind: MutatingWebhookConfiguration
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metadata:
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name: autocert-webhook-config
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labels: {app: controller}
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webhooks:
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- name: autocert.step.sm
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clientConfig:
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service:
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name: autocert
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namespace: step
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path: "/mutate"
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caBundle: $(cat $(step path)/certs/root_ca.crt | base64)
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rules:
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- operations: ["CREATE"]
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apiGroups: [""]
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apiVersions: ["v1"]
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resources: ["pods"]
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failurePolicy: Ignore
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namespaceSelector:
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matchLabels:
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autocert.step.sm: enabled
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EOF
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```
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### Check your work
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If everything worked you should have CA and controller pods running in the `step` namespace and your webhook configuration should be installed:
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```
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$ kubectl -n step get pods
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NAME READY STATUS RESTARTS AGE
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ca-7577d7d667-vtfq5 1/1 Running 0 1m
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controller-86bd99bd96-s9zlc 1/1 Running 0 28s
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$ kubectl get mutatingwebhookconfiguration
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NAME CREATED AT
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autocert-webhook-config 2019-01-17T22:57:57Z
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```
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247
autocert/README.md
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247
autocert/README.md
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AUTOCERT LOGO (see external-dns)
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Autocert issues X.509 certificates from your own internal certificate authority and auto-mounts them in kubernetes containers so services can use TLS.
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Autocert is a kubernetes add-on that integrates with `step certificates` to automatically issue X.509 certificates and mount them in your containers. It also automatically renews certificates before they expire.
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Diagram / Video
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Autocert certificates let you secure your data plane (service-to-service) communication using mutual TLS (mTLS). Services and proxies can limit access to clients that also have a certificate issued by your certificate authority (CA). Servers can identify which client is connecting improving visibility and enabling granular access control.
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Once certificates are issued you can use mTLS to secure communication in to, out of, and between kubernetes clusters. Services can use mTLS to only allow connections from clients that have their own certificate issued from your CA.
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It's like your own Let's Encrypt, but you control who gets a certificate.
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## Getting Started
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These instructions will get `autocert` installed quickly on an existing kubernetes cluster.
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### Prerequisites
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Make sure you've [`installed step`](https://github.com/smallstep/cli#installing) version `0.8.3` or later:
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```
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$ step version
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Smallstep CLI/0.8.3 (darwin/amd64)
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Release Date: 2019-01-16 01:46 UTC
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```
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You'll also need `kubectl` and a kubernetes cluster running version `1.9` or later:
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```
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$ kubectl version --short
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Client Version: v1.13.1
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Server Version: v1.10.11
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```
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You'll also need [webhook admission controllers](https://kubernetes.io/docs/reference/access-authn-authz/extensible-admission-controllers/#admission-webhooks) enabled in your cluster:
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```
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$ kubectl api-versions | grep "admissionregistration.k8s.io/v1beta1"
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admissionregistration.k8s.io/v1beta1
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```
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We'll be creating a new kubernetes namespace and setting up some RBAC rules during installation. You'll need appropriate permissions in your cluster (e.g., you may need to be cluster-admin).
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```
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TODO: Check whether you have cluster permissions..? GKE instructions here if you don't have them.
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```
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In order to grant these permissions you may need to give yourself cluster-admin rights in your cluster. GKE, in particular, does not give the cluster owner these rights by default. You can give yourself cluster-admin rights by running:
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```
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kubectl create clusterrolebinding cluster-admin-binding \
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--clusterrole cluster-admin \
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--user $(gcloud config get-value account)
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```
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### Install
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You can install `step certificates` and `autocert` in one step by running:
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```
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curl https://github.com/smallstep/... | sh
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```
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If you don't like piping `curl` to `sh` (good for you) you can also [install manually](INSTALL.md) then return here to complete the quick start guide.
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### Enable autocert
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To enable `autocert` for a namespace the `autocert.step.sm=enabled` label (the `autocert` webhook will not affect namespaces for which it is not enabled). To enable `autocert` for the default namespace run:
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```
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$ kubectl label namespace default autocert.step.sm=enabled
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```
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To check your work you can check which namespaces have `autocert` enabled by running:
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```
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$ kubectl get namespace -L autocert.step.sm
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NAME STATUS AGE AUTOCERT.STEP.SM
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default Active 59m enabled
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...
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```
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### Annotate pods
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In addition to enabling `autocert` for a namespace, pods must be annotated with their name for certificates to be injected. The annotated name will appear as the common name and SAN in the issued certificate.
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To trigger certificate injection pods must be annotated at creation time. You can do this in your deployment YAMLs:
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```
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$ cat <<EOF | kubectl apply -f -
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apiVersion: apps/v1
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kind: Deployment
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metadata: {name: sleep}
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spec:
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replicas: 1
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selector: {matchLabels: {app: sleep}}
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template:
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metadata:
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annotations:
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autocert.step.sm/name: sleep.default.svc.cluster.local
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labels: {app: sleep}
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spec:
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containers:
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- name: sleep
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image: alpine
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command: ["/bin/sleep", "86400"]
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imagePullPolicy: IfNotPresent
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EOF
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```
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If successful, `kubectl describe pod` will show a new annotation and indicate that a new mount has been created (for certificates). An init container and sidecar are also installed to handle certificate issuance and renewal, respectively.
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```
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$ kubectl describe pod sleep
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Name: sleep-f996bd578-nch7c
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Namespace: default
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<... snip ...>
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Annotations: autocert.step.sm/name: sleep.default.svc.cluster.local
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autocert.step.sm/status: injected
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Status: Running
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<... snip ...>
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Init Containers:
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autocert-bootstrapper:
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Image: step-k8s/bootstrapper
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<... snip ...>
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Containers:
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sleep:
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Image: alpine
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<... snip ...>
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Mounts:
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/var/run/autocert.step.sm from certs (ro)
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/var/run/secrets/kubernetes.io/serviceaccount from default-token-jn988 (ro)
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autocert-renewer:
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Image: step-k8s/renewer
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<... snip ...>
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Volumes:
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certs:
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Type: EmptyDir (a temporary directory that shares a pod's lifetime)
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<... snip ...>
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Events:
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Type Reason Age From Message
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---- ------ ---- ---- -------
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Normal Scheduled 4m2s default-scheduler Successfully assigned sleep-f996bd578-nch7c to docker-for-desktop
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Normal SuccessfulMountVolume 4m2s kubelet, docker-for-desktop MountVolume.SetUp succeeded for volume "certs"
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Normal SuccessfulMountVolume 4m2s kubelet, docker-for-desktop MountVolume.SetUp succeeded for volume "default-token-jn988"
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Normal Pulled 4m1s kubelet, docker-for-desktop Container image "step-k8s/bootstrapper" already present on machine
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Normal Created 4m1s kubelet, docker-for-desktop Created container
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Normal Started 4m kubelet, docker-for-desktop Started container
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Normal Pulled 4m kubelet, docker-for-desktop Container image "alpine" already present on machine
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Normal Created 4m kubelet, docker-for-desktop Created container
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Normal Started 3m59s kubelet, docker-for-desktop Started container
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Normal Pulled 3m59s kubelet, docker-for-desktop Container image "step-k8s/renewer" already present on machine
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Normal Created 3m59s kubelet, docker-for-desktop Created container
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Normal Started 3m59s kubelet, docker-for-desktop Started container
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```
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Certificates are mounted to `/var/run/autocert.step.sm`. We can inspect this directory to make sure everything worked correctly:
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```
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$ kubectl exec -it sleep-f996bd578-nch7c -c sleep -- ls -lias /var/run/autocert.step.sm
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total 20
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1593393 4 drwxrwxrwx 2 root root 4096 Jan 17 21:27 .
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1339651 4 drwxr-xr-x 1 root root 4096 Jan 17 21:27 ..
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1593451 4 -rw------- 1 root root 574 Jan 17 21:27 root.crt
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1593442 4 -rw-r--r-- 1 root root 1352 Jan 17 21:41 site.crt
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1593443 4 -rw-r--r-- 1 root root 227 Jan 17 21:27 site.key
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```
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The `autocert-renewer` sidecare installs the `step` CLI tool, which we can use to inspect the issued certificate:
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```
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$ kubectl exec -it sleep-f996bd578-nch7c -c autocert-renewer -- step certificate inspect /var/run/autocert.step.sm/site.crt
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Certificate:
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Data:
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Version: 3 (0x2)
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Serial Number: 46935033335539540860078000614852612373 (0x234f5bce23705f015a8377ab1cfd5115)
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Signature Algorithm: ECDSA-SHA256
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Issuer: CN=Autocert Intermediate CA
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Validity
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Not Before: Jan 17 21:41:04 2019 UTC
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Not After : Jan 17 21:46:14 2019 UTC
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Subject: CN=sleep.default.svc.cluster.local
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Subject Public Key Info:
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Public Key Algorithm: ECDSA
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Public-Key: (256 bit)
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X:
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31:aa:a1:7f:c8:b4:c6:da:90:fc:b8:3a:e9:cc:48:
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f9:89:b9:5d:d7:a4:63:80:76:9f:21:6d:e5:88:4c:
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a8:e4
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Y:
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ed:21:38:57:cd:3f:32:71:6f:ca:81:34:b0:4a:bd:
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a3:c4:8d:d1:87:bc:2c:4c:42:79:e5:35:49:38:3f:
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b7:c8
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Curve: P-256
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X509v3 extensions:
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X509v3 Key Usage: critical
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Digital Signature, Key Encipherment
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X509v3 Extended Key Usage:
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TLS Web Server Authentication, TLS Web Client Authentication
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X509v3 Subject Key Identifier:
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43:0E:0A:50:30:A5:5B:AF:22:AC:28:49:26:53:2A:B4:D4:20:E0:E0
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X509v3 Authority Key Identifier:
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keyid:61:45:1E:E4:95:4C:0A:6B:37:4C:43:41:FD:54:2E:8E:5E:A2:24:EF
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X509v3 Subject Alternative Name:
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DNS:sleep.default.svc.cluster.local
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Signature Algorithm: ECDSA-SHA256
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30:44:02:20:0c:c5:ab:0d:22:17:a2:04:9f:ff:5f:b1:c0:a5:
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||||||
|
8b:94:88:e0:40:66:e1:19:e9:34:2f:67:74:12:4f:bb:51:8b:
|
||||||
|
02:20:01:7e:0d:44:ce:b2:92:41:d5:78:0d:02:5a:68:05:7c:
|
||||||
|
c2:a9:81:28:71:5c:95:6d:56:51:49:e0:37:b7:09:87
|
||||||
|
```
|
||||||
|
|
||||||
|
### Test your installation
|
||||||
|
|
||||||
|
To test your installation you can install the `hello-mtls` demo app.
|
||||||
|
|
||||||
|
* Install app, which uses mTLS and responds "hello, `identity`"
|
||||||
|
* Do a `kubectl run` of `step-cli` then get a certificate using `step` and `curl hello-mtls` from within the cluster
|
||||||
|
* Port forward from localhost to get a certificate then `curl` with `--resolve`
|
||||||
|
|
||||||
|
### Further reading
|
||||||
|
|
||||||
|
* Link to ExternalDNS example
|
||||||
|
* Link to multiple cluster with Service type ExternalDNS so they can communicate
|
||||||
|
|
||||||
|
### Uninstall
|
||||||
|
|
||||||
|
* Delete the `sleep` deployment (if you created it)
|
||||||
|
* Remove labels (show how to find labelled namespaces)
|
||||||
|
* Remove annotations (show how to find any annotated pods)
|
||||||
|
* Remove secrets (show how to find labelled secrets)
|
||||||
|
* Delete `step` namespace
|
||||||
10
autocert/bootstrapper/Dockerfile
Normal file
10
autocert/bootstrapper/Dockerfile
Normal file
|
|
@ -0,0 +1,10 @@
|
||||||
|
FROM smallstep/step-cli:0.8.3
|
||||||
|
|
||||||
|
USER root
|
||||||
|
ENV CRT="/var/run/autocert.step.sm/site.crt"
|
||||||
|
ENV KEY="/var/run/autocert.step.sm/site.key"
|
||||||
|
ENV STEP_ROOT="/var/run/autocert.step.sm/root.crt"
|
||||||
|
|
||||||
|
COPY bootstrapper.sh /home/step/
|
||||||
|
RUN chmod +x /home/step/bootstrapper.sh
|
||||||
|
CMD ["/home/step/bootstrapper.sh"]
|
||||||
7
autocert/bootstrapper/bootstrapper.sh
Normal file
7
autocert/bootstrapper/bootstrapper.sh
Normal file
|
|
@ -0,0 +1,7 @@
|
||||||
|
#!/bin/sh
|
||||||
|
|
||||||
|
# Download the root certificate and set permissions
|
||||||
|
step ca certificate $COMMON_NAME $CRT $KEY
|
||||||
|
chmod 644 $CRT $KEY
|
||||||
|
|
||||||
|
step ca root $STEP_ROOT
|
||||||
19
autocert/controller/Dockerfile
Normal file
19
autocert/controller/Dockerfile
Normal file
|
|
@ -0,0 +1,19 @@
|
||||||
|
# build stage
|
||||||
|
FROM golang:alpine AS build-env
|
||||||
|
RUN apk update && apk upgrade && \
|
||||||
|
apk add --no-cache git
|
||||||
|
RUN go get -u github.com/golang/dep/cmd/dep
|
||||||
|
WORKDIR $GOPATH/src/github.com/step-certificates-k8s/controller
|
||||||
|
# copy dep files and run dep separately from code for better caching
|
||||||
|
COPY Gopkg.toml Gopkg.lock ./
|
||||||
|
RUN dep ensure --vendor-only
|
||||||
|
COPY . ./
|
||||||
|
RUN go build -o /server .
|
||||||
|
|
||||||
|
# final stage
|
||||||
|
FROM smallstep/step-cli:0.8.3
|
||||||
|
ENV STEPPATH="/home/step/.step"
|
||||||
|
ENV PWDPATH="/home/step/password/password"
|
||||||
|
ENV CONFIGPATH="/home/step/autocert/config.yaml"
|
||||||
|
COPY --from=build-env /server .
|
||||||
|
ENTRYPOINT ./server $CONFIGPATH
|
||||||
124
autocert/controller/client.go
Normal file
124
autocert/controller/client.go
Normal file
|
|
@ -0,0 +1,124 @@
|
||||||
|
package main
|
||||||
|
|
||||||
|
import (
|
||||||
|
"crypto/tls"
|
||||||
|
"crypto/x509"
|
||||||
|
"fmt"
|
||||||
|
"io/ioutil"
|
||||||
|
"net"
|
||||||
|
"net/http"
|
||||||
|
"os"
|
||||||
|
"strings"
|
||||||
|
"time"
|
||||||
|
)
|
||||||
|
|
||||||
|
const (
|
||||||
|
serviceAccountToken = "/var/run/secrets/kubernetes.io/serviceaccount/token"
|
||||||
|
serviceAccountCACert = "/var/run/secrets/kubernetes.io/serviceaccount/ca.crt"
|
||||||
|
)
|
||||||
|
|
||||||
|
// Client is minimal kubernetes client interface
|
||||||
|
type Client interface {
|
||||||
|
Do(req *http.Request) (*http.Response, error)
|
||||||
|
GetRequest(url string) (*http.Request, error)
|
||||||
|
PostRequest(url, body, contentType string) (*http.Request, error)
|
||||||
|
DeleteRequest(url string) (*http.Request, error)
|
||||||
|
Host() string
|
||||||
|
}
|
||||||
|
|
||||||
|
type k8sClient struct {
|
||||||
|
host string
|
||||||
|
token string
|
||||||
|
httpClient *http.Client
|
||||||
|
}
|
||||||
|
|
||||||
|
func (kc *k8sClient) GetRequest(url string) (*http.Request, error) {
|
||||||
|
if !strings.HasPrefix(url, kc.host) {
|
||||||
|
url = fmt.Sprintf("%s/%s", kc.host, url)
|
||||||
|
}
|
||||||
|
req, err := http.NewRequest("GET", url, nil)
|
||||||
|
if err != nil {
|
||||||
|
return nil, err
|
||||||
|
}
|
||||||
|
if len(kc.token) > 0 {
|
||||||
|
req.Header.Set("Authorization", "Bearer "+kc.token)
|
||||||
|
}
|
||||||
|
return req, nil
|
||||||
|
}
|
||||||
|
|
||||||
|
func (kc *k8sClient) PostRequest(url string, body string, contentType string) (*http.Request, error) {
|
||||||
|
if !strings.HasPrefix(url, kc.host) {
|
||||||
|
url = fmt.Sprintf("%s/%s", kc.host, url)
|
||||||
|
}
|
||||||
|
req, err := http.NewRequest("POST", url, strings.NewReader(body))
|
||||||
|
if err != nil {
|
||||||
|
return nil, err
|
||||||
|
}
|
||||||
|
if len(kc.token) > 0 {
|
||||||
|
req.Header.Set("Authorization", "Bearer "+kc.token)
|
||||||
|
}
|
||||||
|
if contentType != "" {
|
||||||
|
req.Header.Set("Content-Type", contentType)
|
||||||
|
}
|
||||||
|
return req, nil
|
||||||
|
}
|
||||||
|
|
||||||
|
func (kc *k8sClient) DeleteRequest(url string) (*http.Request, error) {
|
||||||
|
if !strings.HasPrefix(url, kc.host) {
|
||||||
|
url = fmt.Sprintf("%s/%s", kc.host, url)
|
||||||
|
}
|
||||||
|
req, err := http.NewRequest("DELETE", url, nil)
|
||||||
|
if err != nil {
|
||||||
|
return nil, err
|
||||||
|
}
|
||||||
|
if len(kc.token) > 0 {
|
||||||
|
req.Header.Set("Authorization", "Bearer "+kc.token)
|
||||||
|
}
|
||||||
|
return req, nil
|
||||||
|
}
|
||||||
|
|
||||||
|
func (kc *k8sClient) Do(req *http.Request) (*http.Response, error) {
|
||||||
|
return kc.httpClient.Do(req)
|
||||||
|
}
|
||||||
|
|
||||||
|
func (kc *k8sClient) Host() string {
|
||||||
|
return kc.host
|
||||||
|
}
|
||||||
|
|
||||||
|
// NewInClusterK8sClient creates K8sClient if it is inside Kubernetes
|
||||||
|
func NewInClusterK8sClient() (Client, error) {
|
||||||
|
host, port := os.Getenv("KUBERNETES_SERVICE_HOST"), os.Getenv("KUBERNETES_SERVICE_PORT")
|
||||||
|
if len(host) == 0 || len(port) == 0 {
|
||||||
|
return nil, fmt.Errorf("unable to load in-cluster configuration, KUBERNETES_SERVICE_HOST and KUBERNETES_SERVICE_PORT must be defined")
|
||||||
|
}
|
||||||
|
token, err := ioutil.ReadFile(serviceAccountToken)
|
||||||
|
if err != nil {
|
||||||
|
return nil, err
|
||||||
|
}
|
||||||
|
ca, err := ioutil.ReadFile(serviceAccountCACert)
|
||||||
|
if err != nil {
|
||||||
|
return nil, err
|
||||||
|
}
|
||||||
|
certPool := x509.NewCertPool()
|
||||||
|
certPool.AppendCertsFromPEM(ca)
|
||||||
|
transport := &http.Transport{TLSClientConfig: &tls.Config{
|
||||||
|
MinVersion: tls.VersionTLS10,
|
||||||
|
RootCAs: certPool,
|
||||||
|
}}
|
||||||
|
httpClient := &http.Client{Transport: transport, Timeout: time.Nanosecond * 0}
|
||||||
|
|
||||||
|
return &k8sClient{
|
||||||
|
host: "https://" + net.JoinHostPort(host, port),
|
||||||
|
token: string(token),
|
||||||
|
httpClient: httpClient,
|
||||||
|
}, nil
|
||||||
|
}
|
||||||
|
|
||||||
|
// NewInsecureK8sClient creates an insecure k8s client which is suitable
|
||||||
|
// to connect kubernetes api behind proxy
|
||||||
|
func NewInsecureK8sClient(apiURL string) Client {
|
||||||
|
return &k8sClient{
|
||||||
|
host: apiURL,
|
||||||
|
httpClient: http.DefaultClient,
|
||||||
|
}
|
||||||
|
}
|
||||||
601
autocert/controller/main.go
Normal file
601
autocert/controller/main.go
Normal file
|
|
@ -0,0 +1,601 @@
|
||||||
|
package main
|
||||||
|
|
||||||
|
import (
|
||||||
|
"context"
|
||||||
|
"crypto/sha256"
|
||||||
|
"encoding/json"
|
||||||
|
"encoding/hex"
|
||||||
|
"fmt"
|
||||||
|
"io/ioutil"
|
||||||
|
"net/http"
|
||||||
|
"os"
|
||||||
|
"strings"
|
||||||
|
"time"
|
||||||
|
|
||||||
|
"github.com/ghodss/yaml"
|
||||||
|
"github.com/pkg/errors"
|
||||||
|
log "github.com/sirupsen/logrus"
|
||||||
|
"github.com/smallstep/certificates/ca"
|
||||||
|
"github.com/smallstep/cli/crypto/pemutil"
|
||||||
|
"k8s.io/api/admission/v1beta1"
|
||||||
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
||||||
|
corev1 "k8s.io/api/core/v1"
|
||||||
|
"k8s.io/apimachinery/pkg/runtime"
|
||||||
|
"k8s.io/apimachinery/pkg/runtime/serializer"
|
||||||
|
)
|
||||||
|
|
||||||
|
var (
|
||||||
|
runtimeScheme = runtime.NewScheme()
|
||||||
|
codecs = serializer.NewCodecFactory(runtimeScheme)
|
||||||
|
deserializer = codecs.UniversalDeserializer()
|
||||||
|
// GetRootCAPath() is broken; points to secrets not certs. So
|
||||||
|
// we'll hard code instead for now.
|
||||||
|
//rootCAPath = pki.GetRootCAPath()
|
||||||
|
rootCAPath = "/home/step/.step/certs/root_ca.crt"
|
||||||
|
)
|
||||||
|
|
||||||
|
const (
|
||||||
|
admissionWebhookAnnotationKey = "autocert.step.sm/name"
|
||||||
|
admissionWebhookStatusKey = "autocert.step.sm/status"
|
||||||
|
provisionerPasswordFile = "/home/step/password/password"
|
||||||
|
volumeMountPath = "/var/run/autocert.step.sm"
|
||||||
|
tokenSecretKey = "token"
|
||||||
|
tokenSecretLabel = "autocert.step.sm/token"
|
||||||
|
)
|
||||||
|
|
||||||
|
// Config options for the autocert admission controller.
|
||||||
|
type Config struct {
|
||||||
|
LogFormat string `yaml:"logFormat"`
|
||||||
|
CaUrl string `yaml:"caUrl"`
|
||||||
|
CertLifetime string `yaml:"certLifetime"`
|
||||||
|
Bootstrapper corev1.Container `yaml:"bootstrapper"`
|
||||||
|
Renewer corev1.Container `yaml:"renewer"`
|
||||||
|
CertsVolume corev1.Volume `yaml:"certsVolume"`
|
||||||
|
}
|
||||||
|
|
||||||
|
// RFC6902 JSONPatch Operation
|
||||||
|
type PatchOperation struct {
|
||||||
|
Op string `json:"op"`
|
||||||
|
Path string `json:"path"`
|
||||||
|
Value interface{} `json:"value,omitempty"`
|
||||||
|
}
|
||||||
|
|
||||||
|
// RFC6901 JSONPath Escaping -- https://tools.ietf.org/html/rfc6901
|
||||||
|
func escapeJsonPath(path string) string {
|
||||||
|
// Replace`~` with `~0` then `/` with `~1`. Note that the order
|
||||||
|
// matters otherwise we'll turn a `/` into a `~/`.
|
||||||
|
path = strings.Replace(path, "~", "~0", -1)
|
||||||
|
path = strings.Replace(path, "/", "~1", -1)
|
||||||
|
return path
|
||||||
|
}
|
||||||
|
|
||||||
|
func loadConfig(file string) (*Config, error) {
|
||||||
|
data, err := ioutil.ReadFile(file)
|
||||||
|
if err != nil {
|
||||||
|
return nil, err
|
||||||
|
}
|
||||||
|
|
||||||
|
var cfg Config
|
||||||
|
if err := yaml.Unmarshal(data, &cfg); err != nil {
|
||||||
|
return nil, err
|
||||||
|
}
|
||||||
|
|
||||||
|
return &cfg, nil
|
||||||
|
}
|
||||||
|
|
||||||
|
// createTokenSecret generates a kubernetes Secret object containing a bootstrap token
|
||||||
|
// in the specified namespce. The secret name is randomly generated with a given prefix.
|
||||||
|
// A goroutine is scheduled to cleanup the secret after the token expires. The secret
|
||||||
|
// is also labelled for easy identification and manual cleanup.
|
||||||
|
func createTokenSecret(prefix, namespace, token string) (string, error) {
|
||||||
|
secret := corev1.Secret {
|
||||||
|
TypeMeta: metav1.TypeMeta {
|
||||||
|
Kind: "Secret",
|
||||||
|
APIVersion: "v1",
|
||||||
|
},
|
||||||
|
ObjectMeta: metav1.ObjectMeta {
|
||||||
|
GenerateName: prefix,
|
||||||
|
Namespace: namespace,
|
||||||
|
Labels: map[string]string {
|
||||||
|
tokenSecretLabel: "true",
|
||||||
|
},
|
||||||
|
},
|
||||||
|
StringData: map[string]string {
|
||||||
|
tokenSecretKey: token,
|
||||||
|
},
|
||||||
|
Type: corev1.SecretTypeOpaque,
|
||||||
|
}
|
||||||
|
|
||||||
|
client, err := NewInClusterK8sClient()
|
||||||
|
if err != nil {
|
||||||
|
return "", err
|
||||||
|
}
|
||||||
|
|
||||||
|
body, err := json.Marshal(secret)
|
||||||
|
if err != nil {
|
||||||
|
return "", err
|
||||||
|
}
|
||||||
|
log.WithField("secret", string(body)).Debug("Creating secret")
|
||||||
|
|
||||||
|
req, err := client.PostRequest(fmt.Sprintf("api/v1/namespaces/%s/secrets", namespace), string(body), "application/json")
|
||||||
|
if err != nil {
|
||||||
|
return "", err
|
||||||
|
}
|
||||||
|
|
||||||
|
resp, err := client.Do(req)
|
||||||
|
if err != nil {
|
||||||
|
log.Errorf("Secret creation error. Response: %v", resp)
|
||||||
|
return "", errors.Wrap(err, "secret creation")
|
||||||
|
}
|
||||||
|
if resp.StatusCode < 200 || resp.StatusCode >= 300 {
|
||||||
|
log.Errorf("Secret creation error (!2XX). Response: %v", resp)
|
||||||
|
var rbody []byte
|
||||||
|
if resp.Body != nil {
|
||||||
|
if data, err := ioutil.ReadAll(resp.Body); err == nil {
|
||||||
|
rbody = data
|
||||||
|
}
|
||||||
|
}
|
||||||
|
log.Error("Error body: ", string(rbody))
|
||||||
|
return "", errors.New("Not 200")
|
||||||
|
}
|
||||||
|
|
||||||
|
var rbody []byte
|
||||||
|
if resp.Body != nil {
|
||||||
|
if data, err := ioutil.ReadAll(resp.Body); err == nil {
|
||||||
|
rbody = data
|
||||||
|
}
|
||||||
|
}
|
||||||
|
if len(rbody) == 0 {
|
||||||
|
return "", errors.New("Empty response body")
|
||||||
|
}
|
||||||
|
|
||||||
|
var created *corev1.Secret
|
||||||
|
if err := json.Unmarshal(rbody, &created); err != nil {
|
||||||
|
return "", errors.Wrap(err, "Error unmarshalling secret response")
|
||||||
|
}
|
||||||
|
|
||||||
|
// Clean up after ourselves by deleting the Secret after the bootstrap
|
||||||
|
// token expires. This is best effort -- obviously we'll miss some stuff
|
||||||
|
// if this process goes away -- but the secrets are also labelled so
|
||||||
|
// it's also easy to clean them up in bulk using kubectl if we miss any.
|
||||||
|
go func() {
|
||||||
|
time.Sleep(tokenLifetime)
|
||||||
|
req, err := client.DeleteRequest(fmt.Sprintf("api/v1/namespaces/%s/secrets/%s", namespace, created.Name))
|
||||||
|
ctxLog := log.WithFields(log.Fields{
|
||||||
|
"name": created.Name,
|
||||||
|
"namespace": namespace,
|
||||||
|
})
|
||||||
|
if err != nil {
|
||||||
|
ctxLog.WithField("error", err).Error("Error deleting expired boostrap token secret")
|
||||||
|
return
|
||||||
|
}
|
||||||
|
resp, err := client.Do(req)
|
||||||
|
if err != nil {
|
||||||
|
ctxLog.WithField("error", err).Error("Error deleting expired boostrap token secret")
|
||||||
|
return
|
||||||
|
}
|
||||||
|
if resp.StatusCode < 200 || resp.StatusCode >= 300 {
|
||||||
|
ctxLog.WithFields(log.Fields{
|
||||||
|
"status": resp.Status,
|
||||||
|
"statusCode": resp.StatusCode,
|
||||||
|
}).Error("Error deleting expired boostrap token secret")
|
||||||
|
return
|
||||||
|
}
|
||||||
|
ctxLog.Info("Deleted expired bootstrap token secret")
|
||||||
|
}()
|
||||||
|
|
||||||
|
return created.Name, err
|
||||||
|
}
|
||||||
|
|
||||||
|
// mkBootstrapper generates a bootstrap container based on the template defined in Config. It
|
||||||
|
// generates a new bootstrap token and mounts it, along with other required coniguration, as
|
||||||
|
// environment variables in the returned bootstrap container.
|
||||||
|
func mkBootstrapper(config *Config, commonName string, namespace string, provisioner Provisioner) (corev1.Container, error) {
|
||||||
|
b := config.Bootstrapper
|
||||||
|
|
||||||
|
token, err := provisioner.Token(commonName)
|
||||||
|
if err != nil {
|
||||||
|
return b, errors.Wrap(err, "token generation")
|
||||||
|
}
|
||||||
|
|
||||||
|
// Generate CA fingerprint
|
||||||
|
crt, err := pemutil.ReadCertificate(rootCAPath)
|
||||||
|
if err != nil {
|
||||||
|
return b, errors.Wrap(err, "CA fingerprint")
|
||||||
|
}
|
||||||
|
sum := sha256.Sum256(crt.Raw)
|
||||||
|
fingerprint := strings.ToLower(hex.EncodeToString(sum[:]))
|
||||||
|
|
||||||
|
secretName, err := createTokenSecret(commonName + "-", namespace, token)
|
||||||
|
if err != nil {
|
||||||
|
return b, errors.Wrap(err, "create token secret")
|
||||||
|
}
|
||||||
|
log.Infof("Secret name is: %s", secretName)
|
||||||
|
|
||||||
|
b.Env = append(b.Env, corev1.EnvVar {
|
||||||
|
Name: "COMMON_NAME",
|
||||||
|
Value: commonName,
|
||||||
|
})
|
||||||
|
b.Env = append(b.Env, corev1.EnvVar {
|
||||||
|
Name: "STEP_TOKEN",
|
||||||
|
ValueFrom: &corev1.EnvVarSource {
|
||||||
|
SecretKeyRef: &corev1.SecretKeySelector {
|
||||||
|
LocalObjectReference: corev1.LocalObjectReference {
|
||||||
|
Name: secretName,
|
||||||
|
},
|
||||||
|
Key: tokenSecretKey,
|
||||||
|
},
|
||||||
|
},
|
||||||
|
})
|
||||||
|
b.Env = append(b.Env, corev1.EnvVar {
|
||||||
|
Name: "STEP_CA_URL",
|
||||||
|
Value: config.CaUrl,
|
||||||
|
})
|
||||||
|
b.Env = append(b.Env, corev1.EnvVar {
|
||||||
|
Name: "STEP_FINGERPRINT",
|
||||||
|
Value: fingerprint,
|
||||||
|
})
|
||||||
|
b.Env = append(b.Env, corev1.EnvVar {
|
||||||
|
Name: "STEP_NOT_AFTER",
|
||||||
|
Value: config.CertLifetime,
|
||||||
|
})
|
||||||
|
return b, nil
|
||||||
|
}
|
||||||
|
|
||||||
|
// mkRenewer generates a new renewer based on the template provided in Config.
|
||||||
|
func mkRenewer(config *Config) (corev1.Container) {
|
||||||
|
r := config.Renewer
|
||||||
|
r.Env = append(r.Env, corev1.EnvVar {
|
||||||
|
Name: "STEP_CA_URL",
|
||||||
|
Value: config.CaUrl,
|
||||||
|
})
|
||||||
|
return r
|
||||||
|
}
|
||||||
|
|
||||||
|
func addContainers(existing, new []corev1.Container, path string) (ops []PatchOperation) {
|
||||||
|
if len(existing) == 0 {
|
||||||
|
return []PatchOperation {
|
||||||
|
PatchOperation {
|
||||||
|
Op: "add",
|
||||||
|
Path: path,
|
||||||
|
Value: new,
|
||||||
|
},
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
for _, add := range new {
|
||||||
|
ops = append(ops, PatchOperation {
|
||||||
|
Op: "add",
|
||||||
|
Path: path + "/-",
|
||||||
|
Value: add,
|
||||||
|
})
|
||||||
|
}
|
||||||
|
return ops
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func addVolumes(existing, new []corev1.Volume, path string) (ops []PatchOperation) {
|
||||||
|
if len(existing) == 0 {
|
||||||
|
return []PatchOperation{
|
||||||
|
PatchOperation {
|
||||||
|
Op: "add",
|
||||||
|
Path: path,
|
||||||
|
Value: new,
|
||||||
|
},
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
for _, add := range new {
|
||||||
|
ops = append(ops, PatchOperation {
|
||||||
|
Op: "add",
|
||||||
|
Path: path + "/-",
|
||||||
|
Value: add,
|
||||||
|
})
|
||||||
|
}
|
||||||
|
return ops
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func addCertsVolumeMount(volumeName string, containers []corev1.Container) (ops []PatchOperation) {
|
||||||
|
volumeMount := corev1.VolumeMount {
|
||||||
|
Name: volumeName,
|
||||||
|
MountPath: volumeMountPath,
|
||||||
|
ReadOnly: true,
|
||||||
|
}
|
||||||
|
for i, container := range containers {
|
||||||
|
if len(container.VolumeMounts) == 0 {
|
||||||
|
ops = append(ops, PatchOperation {
|
||||||
|
Op: "add",
|
||||||
|
Path: fmt.Sprintf("/spec/containers/%v/volumeMounts", i),
|
||||||
|
Value: []corev1.VolumeMount{volumeMount},
|
||||||
|
})
|
||||||
|
} else {
|
||||||
|
ops = append(ops, PatchOperation {
|
||||||
|
Op: "add",
|
||||||
|
Path: fmt.Sprintf("/spec/containers/%v/volumeMounts/-", i),
|
||||||
|
Value: volumeMount,
|
||||||
|
})
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return ops
|
||||||
|
}
|
||||||
|
|
||||||
|
func addAnnotations(existing, new map[string]string) (ops []PatchOperation) {
|
||||||
|
if len(existing) == 0 {
|
||||||
|
return []PatchOperation{
|
||||||
|
PatchOperation {
|
||||||
|
Op: "add",
|
||||||
|
Path: "/metadata/annotations",
|
||||||
|
Value: new,
|
||||||
|
},
|
||||||
|
}
|
||||||
|
}
|
||||||
|
for k, v := range new {
|
||||||
|
if existing[k] == "" {
|
||||||
|
ops = append(ops, PatchOperation {
|
||||||
|
Op: "add",
|
||||||
|
Path: "/metadata/annotations/" + escapeJsonPath(k),
|
||||||
|
Value: v,
|
||||||
|
})
|
||||||
|
} else {
|
||||||
|
ops = append(ops, PatchOperation {
|
||||||
|
Op: "replace",
|
||||||
|
Path: "/metadata/annotations/" + escapeJsonPath(k),
|
||||||
|
Value: v,
|
||||||
|
})
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return ops
|
||||||
|
}
|
||||||
|
|
||||||
|
// patch produces a list of patches to apply to a pod to inject a certificate. In particular,
|
||||||
|
// we patch the pod in order to:
|
||||||
|
// - Mount the `certs` volume in existing containers defined in the pod
|
||||||
|
// - Add the autocert-renewer as a container (a sidecar)
|
||||||
|
// - Add the autocert-bootstrapper as an initContainer
|
||||||
|
// - Add the `certs` volume definition
|
||||||
|
// - Annotate the pod to indicate that it's been processed by this controller
|
||||||
|
// The result is a list of serialized JSONPatch objects (or an error).
|
||||||
|
func patch(pod *corev1.Pod, namespace string, config *Config, provisioner Provisioner) ([]byte, error) {
|
||||||
|
var ops[] PatchOperation
|
||||||
|
|
||||||
|
commonName := pod.ObjectMeta.GetAnnotations()[admissionWebhookAnnotationKey]
|
||||||
|
renewer := mkRenewer(config)
|
||||||
|
bootstrapper, err := mkBootstrapper(config, commonName, namespace, provisioner)
|
||||||
|
if err != nil {
|
||||||
|
return nil, err
|
||||||
|
}
|
||||||
|
|
||||||
|
ops = append(ops, addCertsVolumeMount(config.CertsVolume.Name, pod.Spec.Containers)...)
|
||||||
|
ops = append(ops, addContainers(pod.Spec.Containers, []corev1.Container{renewer}, "/spec/containers")...)
|
||||||
|
ops = append(ops, addContainers(pod.Spec.InitContainers, []corev1.Container{bootstrapper}, "/spec/initContainers")...)
|
||||||
|
ops = append(ops, addVolumes(pod.Spec.Volumes, []corev1.Volume{config.CertsVolume}, "/spec/volumes")...)
|
||||||
|
ops = append(ops, addAnnotations(pod.Annotations, map[string]string{admissionWebhookStatusKey: "injected"})...)
|
||||||
|
|
||||||
|
return json.Marshal(ops)
|
||||||
|
}
|
||||||
|
|
||||||
|
// shouldMutate checks whether a pod is subject to mutation by this admission controller. A pod
|
||||||
|
// is subject to mutation if it's annotated with the `admissionWebhookAnnotationKey` and if it
|
||||||
|
// has not already been processed (indicated by `admissionWebhookStatusKey` set to `injected`).
|
||||||
|
func shouldMutate(metadata *metav1.ObjectMeta) bool {
|
||||||
|
annotations := metadata.GetAnnotations()
|
||||||
|
if annotations == nil {
|
||||||
|
annotations = map[string]string{}
|
||||||
|
}
|
||||||
|
|
||||||
|
// Only mutate if the object is annotated appropriately (annotation key set) and we haven't
|
||||||
|
// mutated already (status key isn't set).
|
||||||
|
if annotations[admissionWebhookAnnotationKey] == "" || annotations[admissionWebhookStatusKey] == "injected" {
|
||||||
|
return false
|
||||||
|
} else {
|
||||||
|
return true
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// mutate takes an `AdmissionReview`, determines whether it is subject to mutation, and returns
|
||||||
|
// an appropriate `AdmissionResponse` including patches or any errors that occurred.
|
||||||
|
func mutate(review *v1beta1.AdmissionReview, config *Config, provisioner Provisioner) *v1beta1.AdmissionResponse {
|
||||||
|
ctxLog := log.WithField("uid", review.Request.UID)
|
||||||
|
|
||||||
|
request := review.Request
|
||||||
|
var pod corev1.Pod
|
||||||
|
if err := json.Unmarshal(request.Object.Raw, &pod); err != nil {
|
||||||
|
ctxLog.WithField("error", err).Error("Error unmarshalling pod")
|
||||||
|
return &v1beta1.AdmissionResponse {
|
||||||
|
Allowed: false,
|
||||||
|
UID: request.UID,
|
||||||
|
Result: &metav1.Status {
|
||||||
|
Message: err.Error(),
|
||||||
|
},
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
ctxLog = ctxLog.WithFields(log.Fields{
|
||||||
|
"kind": request.Kind,
|
||||||
|
"operation": request.Operation,
|
||||||
|
"name": pod.Name,
|
||||||
|
"generateName": pod.GenerateName,
|
||||||
|
"namespace": request.Namespace,
|
||||||
|
"user": request.UserInfo,
|
||||||
|
})
|
||||||
|
|
||||||
|
if !shouldMutate(&pod.ObjectMeta) {
|
||||||
|
ctxLog.WithField("annotations", pod.Annotations).Info("Skipping mutation")
|
||||||
|
return &v1beta1.AdmissionResponse {
|
||||||
|
Allowed: true,
|
||||||
|
UID: request.UID,
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
patchBytes, err := patch(&pod, request.Namespace, config, provisioner)
|
||||||
|
if err != nil {
|
||||||
|
ctxLog.WithField("error", err).Error("Error generating patch")
|
||||||
|
return &v1beta1.AdmissionResponse {
|
||||||
|
Allowed: false,
|
||||||
|
UID: request.UID,
|
||||||
|
Result: &metav1.Status {
|
||||||
|
Message: err.Error(),
|
||||||
|
},
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
ctxLog.WithField("patch", string(patchBytes)).Info("Generated patch")
|
||||||
|
return &v1beta1.AdmissionResponse {
|
||||||
|
Allowed: true,
|
||||||
|
Patch: patchBytes,
|
||||||
|
UID: request.UID,
|
||||||
|
PatchType: func() *v1beta1.PatchType {
|
||||||
|
pt := v1beta1.PatchTypeJSONPatch
|
||||||
|
return &pt
|
||||||
|
}(),
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func main() {
|
||||||
|
if len(os.Args) != 2 {
|
||||||
|
log.Errorf("Usage: %s <config>\n", os.Args[0])
|
||||||
|
os.Exit(1)
|
||||||
|
}
|
||||||
|
|
||||||
|
config, err := loadConfig(os.Args[1])
|
||||||
|
if err != nil {
|
||||||
|
panic(err)
|
||||||
|
}
|
||||||
|
|
||||||
|
log.SetOutput(os.Stdout)
|
||||||
|
if config.LogFormat == "json" {
|
||||||
|
log.SetFormatter(&log.JSONFormatter{})
|
||||||
|
}
|
||||||
|
if config.LogFormat == "text" {
|
||||||
|
log.SetFormatter(&log.TextFormatter{})
|
||||||
|
}
|
||||||
|
|
||||||
|
log.WithFields(log.Fields{
|
||||||
|
"config": config,
|
||||||
|
}).Info("Loaded config")
|
||||||
|
|
||||||
|
provisionerName := os.Getenv("PROVISIONER_NAME")
|
||||||
|
provisionerKid := os.Getenv("PROVISIONER_KID")
|
||||||
|
log.WithFields(log.Fields{
|
||||||
|
"provisionerName": provisionerName,
|
||||||
|
"provisionerKid": provisionerKid,
|
||||||
|
}).Info("Loaded provisioner configuration")
|
||||||
|
|
||||||
|
provisioner, err := NewProvisioner(provisionerName, provisionerKid, config.CaUrl, rootCAPath, provisionerPasswordFile)
|
||||||
|
if err != nil {
|
||||||
|
log.Errorf("Error loading provisioner: %v", err)
|
||||||
|
os.Exit(1)
|
||||||
|
}
|
||||||
|
log.WithFields(log.Fields{
|
||||||
|
"name": provisioner.Name(),
|
||||||
|
"kid": provisioner.Kid(),
|
||||||
|
}).Info("Loaded provisioner")
|
||||||
|
|
||||||
|
namespace := os.Getenv("NAMESPACE")
|
||||||
|
if namespace == "" {
|
||||||
|
log.Errorf("$NAMESPACE not set")
|
||||||
|
os.Exit(1)
|
||||||
|
}
|
||||||
|
|
||||||
|
name := fmt.Sprintf("autocert.%s.svc", namespace)
|
||||||
|
token, err := provisioner.Token(name)
|
||||||
|
if err != nil {
|
||||||
|
log.WithField("error", err).Errorf("Error generating bootstrap token during controller startup")
|
||||||
|
os.Exit(1)
|
||||||
|
}
|
||||||
|
log.WithField("name", name).Infof("Generated bootstrap token for controller")
|
||||||
|
|
||||||
|
// make sure to cancel the renew goroutine
|
||||||
|
ctx, cancel := context.WithCancel(context.Background())
|
||||||
|
defer cancel()
|
||||||
|
|
||||||
|
srv, err := ca.BootstrapServer(ctx, token, &http.Server{
|
||||||
|
Addr: ":4443",
|
||||||
|
Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
||||||
|
if r.URL.Path == "/healthz" {
|
||||||
|
log.Info("/healthz")
|
||||||
|
fmt.Fprintf(w, "ok")
|
||||||
|
w.WriteHeader(http.StatusOK)
|
||||||
|
return
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
var name string
|
||||||
|
if r.TLS != nil && len(r.TLS.PeerCertificates) > 0 {
|
||||||
|
name = r.TLS.PeerCertificates[0].Subject.CommonName
|
||||||
|
}
|
||||||
|
*/
|
||||||
|
|
||||||
|
if r.URL.Path != "/mutate" {
|
||||||
|
log.WithField("path", r.URL.Path).Error("Bad Request: 404 Not Found")
|
||||||
|
http.NotFound(w, r)
|
||||||
|
return
|
||||||
|
}
|
||||||
|
|
||||||
|
var body []byte
|
||||||
|
if r.Body != nil {
|
||||||
|
if data, err := ioutil.ReadAll(r.Body); err == nil {
|
||||||
|
body = data
|
||||||
|
}
|
||||||
|
}
|
||||||
|
if len(body) == 0 {
|
||||||
|
log.Error("Bad Request: 400 (Empty Body)")
|
||||||
|
http.Error(w, "Bad Request (Empty Body)", http.StatusBadRequest)
|
||||||
|
return
|
||||||
|
}
|
||||||
|
|
||||||
|
contentType := r.Header.Get("Content-Type")
|
||||||
|
if contentType != "application/json" {
|
||||||
|
log.WithField("Content-Type", contentType).Error("Bad Request: 415 (Unsupported Media Type)")
|
||||||
|
http.Error(w, fmt.Sprintf("Bad Request: 415 Unsupported Media Type (Expected Content-Type 'application/json' but got '%s')", contentType), http.StatusUnsupportedMediaType)
|
||||||
|
return
|
||||||
|
}
|
||||||
|
|
||||||
|
var response *v1beta1.AdmissionResponse
|
||||||
|
review := v1beta1.AdmissionReview{}
|
||||||
|
if _, _, err := deserializer.Decode(body, nil, &review); err != nil {
|
||||||
|
log.WithFields(log.Fields{
|
||||||
|
"body": body,
|
||||||
|
"error": err,
|
||||||
|
}).Error("Can't decode body")
|
||||||
|
response = &v1beta1.AdmissionResponse {
|
||||||
|
Allowed: false,
|
||||||
|
Result: &metav1.Status {
|
||||||
|
Message: err.Error(),
|
||||||
|
},
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
response = mutate(&review, config, provisioner)
|
||||||
|
}
|
||||||
|
|
||||||
|
resp, err := json.Marshal(v1beta1.AdmissionReview {
|
||||||
|
Response: response,
|
||||||
|
})
|
||||||
|
if err != nil {
|
||||||
|
log.WithFields(log.Fields{
|
||||||
|
"uid": review.Request.UID,
|
||||||
|
"error": err,
|
||||||
|
}).Info("Marshal error")
|
||||||
|
http.Error(w, fmt.Sprintf("Marshal Error: %v", err), http.StatusInternalServerError)
|
||||||
|
} else {
|
||||||
|
log.WithFields(log.Fields{
|
||||||
|
"uid": review.Request.UID,
|
||||||
|
"response": string(resp),
|
||||||
|
}).Info("Returning review")
|
||||||
|
if _, err := w.Write(resp); err != nil {
|
||||||
|
log.WithFields(log.Fields{
|
||||||
|
"uid": review.Request.UID,
|
||||||
|
"error": err,
|
||||||
|
}).Info("Write error")
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}),
|
||||||
|
}, ca.VerifyClientCertIfGiven())
|
||||||
|
if err != nil {
|
||||||
|
panic(err)
|
||||||
|
}
|
||||||
|
|
||||||
|
log.Info("Listening on :4443 ...")
|
||||||
|
if err := srv.ListenAndServeTLS("", ""); err != nil {
|
||||||
|
panic(err)
|
||||||
|
}
|
||||||
|
}
|
||||||
143
autocert/controller/provisioner.go
Normal file
143
autocert/controller/provisioner.go
Normal file
|
|
@ -0,0 +1,143 @@
|
||||||
|
package main
|
||||||
|
|
||||||
|
import (
|
||||||
|
"encoding/json"
|
||||||
|
"fmt"
|
||||||
|
"time"
|
||||||
|
|
||||||
|
"github.com/pkg/errors"
|
||||||
|
"github.com/smallstep/cli/crypto/pki"
|
||||||
|
"github.com/smallstep/cli/crypto/randutil"
|
||||||
|
"github.com/smallstep/cli/jose"
|
||||||
|
"github.com/smallstep/cli/token"
|
||||||
|
"github.com/smallstep/cli/token/provision"
|
||||||
|
)
|
||||||
|
|
||||||
|
const (
|
||||||
|
tokenLifetime = 5 * time.Minute
|
||||||
|
)
|
||||||
|
|
||||||
|
type Provisioner interface {
|
||||||
|
Name() string
|
||||||
|
Kid() string
|
||||||
|
Token(subject string) (string, error)
|
||||||
|
}
|
||||||
|
|
||||||
|
type provisioner struct {
|
||||||
|
name string
|
||||||
|
kid string
|
||||||
|
caUrl string
|
||||||
|
caRoot string
|
||||||
|
jwk *jose.JSONWebKey
|
||||||
|
tokenLifetime time.Duration
|
||||||
|
}
|
||||||
|
|
||||||
|
// Name returns the provisioner's name.
|
||||||
|
func (p *provisioner) Name() string {
|
||||||
|
return p.name
|
||||||
|
}
|
||||||
|
|
||||||
|
// Kid returns the provisioners key ID.
|
||||||
|
func (p *provisioner) Kid() string {
|
||||||
|
return p.kid
|
||||||
|
}
|
||||||
|
|
||||||
|
// Token generates a bootstrap token for a subject.
|
||||||
|
func (p *provisioner) Token(subject string) (string, error) {
|
||||||
|
// A random jwt id will be used to identify duplicated tokens
|
||||||
|
jwtID, err := randutil.Hex(64) // 256 bits
|
||||||
|
if err != nil {
|
||||||
|
return "", err
|
||||||
|
}
|
||||||
|
|
||||||
|
notBefore := time.Now()
|
||||||
|
notAfter := notBefore.Add(tokenLifetime)
|
||||||
|
signUrl := fmt.Sprintf("%v/1.0/sign", p.caUrl)
|
||||||
|
|
||||||
|
tokOptions := []token.Options{
|
||||||
|
token.WithJWTID(jwtID),
|
||||||
|
token.WithKid(p.kid),
|
||||||
|
token.WithIssuer(p.name),
|
||||||
|
token.WithAudience(signUrl),
|
||||||
|
token.WithValidity(notBefore, notAfter),
|
||||||
|
token.WithRootCA(p.caRoot),
|
||||||
|
}
|
||||||
|
|
||||||
|
tok, err := provision.New(subject, tokOptions...)
|
||||||
|
if err != nil {
|
||||||
|
return "", err
|
||||||
|
}
|
||||||
|
|
||||||
|
return tok.SignedString(p.jwk.Algorithm, p.jwk.Key)
|
||||||
|
}
|
||||||
|
|
||||||
|
func decryptProvisionerJWK(encryptedKey, passFile string) (*jose.JSONWebKey, error) {
|
||||||
|
decrypted, err := jose.Decrypt("", []byte(encryptedKey), jose.WithPasswordFile(passFile))
|
||||||
|
if err != nil {
|
||||||
|
return nil, err
|
||||||
|
}
|
||||||
|
|
||||||
|
jwk := new(jose.JSONWebKey)
|
||||||
|
if err := json.Unmarshal(decrypted, jwk); err != nil {
|
||||||
|
return nil, errors.Wrap(err, "error unmarshalling provisioning key")
|
||||||
|
}
|
||||||
|
return jwk, nil
|
||||||
|
}
|
||||||
|
|
||||||
|
// loadProvisionerJWKByKid retrieves a provisioner key from the CA by key ID and
|
||||||
|
// decrypts it using the specified password file.
|
||||||
|
func loadProvisionerJWKByKid(kid, caUrl, caRoot, passFile string) (*jose.JSONWebKey, error) {
|
||||||
|
encrypted, err := pki.GetProvisionerKey(caUrl, caRoot, kid)
|
||||||
|
if err != nil {
|
||||||
|
return nil, err
|
||||||
|
}
|
||||||
|
|
||||||
|
return decryptProvisionerJWK(encrypted, passFile)
|
||||||
|
}
|
||||||
|
|
||||||
|
// loadProvisionerJWKByName retrieves the list of provisioners and encrypted key then
|
||||||
|
// returns the key of the first provisioner with a matching name that can be successfully
|
||||||
|
// decrypted with the specified password file.
|
||||||
|
func loadProvisionerJWKByName(name, caUrl, caRoot, passFile string) (key *jose.JSONWebKey, err error) {
|
||||||
|
provisioners, err := pki.GetProvisioners(caUrl, caRoot)
|
||||||
|
if err != nil {
|
||||||
|
err = errors.Wrap(err, "error getting the provisioners")
|
||||||
|
return
|
||||||
|
}
|
||||||
|
|
||||||
|
for _, provisioner := range provisioners {
|
||||||
|
if provisioner.Name == name {
|
||||||
|
key, err = decryptProvisionerJWK(provisioner.EncryptedKey, passFile)
|
||||||
|
if err == nil {
|
||||||
|
return
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return nil, errors.New(fmt.Sprintf("provisioner '%s' not found (or your password is wrong)", name))
|
||||||
|
}
|
||||||
|
|
||||||
|
// NewProvisioner loads and decrypts key material from the CA for the named
|
||||||
|
// provisioner. The key identified by `kid` will be used if specified. If `kid`
|
||||||
|
// is the empty string we'll use the first key for the named provisioner that
|
||||||
|
// decrypts using `passFile`.
|
||||||
|
func NewProvisioner(name, kid, caUrl, caRoot, passFile string) (Provisioner, error) {
|
||||||
|
var jwk *jose.JSONWebKey
|
||||||
|
var err error
|
||||||
|
if kid != "" {
|
||||||
|
jwk, err = loadProvisionerJWKByKid(kid, caUrl, caRoot, passFile)
|
||||||
|
} else {
|
||||||
|
jwk, err = loadProvisionerJWKByName(name, caUrl, caRoot, passFile)
|
||||||
|
}
|
||||||
|
if err != nil {
|
||||||
|
return nil, err
|
||||||
|
}
|
||||||
|
|
||||||
|
return &provisioner{
|
||||||
|
name: name,
|
||||||
|
kid: jwk.KeyID,
|
||||||
|
caUrl: caUrl,
|
||||||
|
caRoot: caRoot,
|
||||||
|
jwk: jwk,
|
||||||
|
tokenLifetime: tokenLifetime,
|
||||||
|
}, nil
|
||||||
|
}
|
||||||
87
autocert/install/01-step-ca.yaml
Normal file
87
autocert/install/01-step-ca.yaml
Normal file
|
|
@ -0,0 +1,87 @@
|
||||||
|
apiVersion: v1
|
||||||
|
kind: Service
|
||||||
|
metadata:
|
||||||
|
labels:
|
||||||
|
app: ca
|
||||||
|
name: ca
|
||||||
|
namespace: step
|
||||||
|
spec:
|
||||||
|
type: ClusterIP
|
||||||
|
ports:
|
||||||
|
- port: 443
|
||||||
|
targetPort: 4443
|
||||||
|
selector:
|
||||||
|
app: ca
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
apiVersion: apps/v1
|
||||||
|
kind: Deployment
|
||||||
|
metadata:
|
||||||
|
name: ca
|
||||||
|
namespace: step
|
||||||
|
labels:
|
||||||
|
app: ca
|
||||||
|
spec:
|
||||||
|
replicas: 1
|
||||||
|
selector:
|
||||||
|
matchLabels:
|
||||||
|
app: ca
|
||||||
|
template:
|
||||||
|
metadata:
|
||||||
|
labels:
|
||||||
|
app: ca
|
||||||
|
spec:
|
||||||
|
containers:
|
||||||
|
- name: ca
|
||||||
|
image: smallstep/step-ca:0.8.3
|
||||||
|
env:
|
||||||
|
- name: PWDPATH
|
||||||
|
value: /home/step/password/password
|
||||||
|
resources:
|
||||||
|
requests:
|
||||||
|
cpu: 100m
|
||||||
|
memory: 20Mi
|
||||||
|
readinessProbe:
|
||||||
|
httpGet:
|
||||||
|
path: /health
|
||||||
|
port: 4443
|
||||||
|
scheme: HTTPS
|
||||||
|
initialDelaySeconds: 3
|
||||||
|
periodSeconds: 3
|
||||||
|
livenessProbe:
|
||||||
|
httpGet:
|
||||||
|
path: /health
|
||||||
|
port: 4443
|
||||||
|
scheme: HTTPS
|
||||||
|
initialDelaySeconds: 3
|
||||||
|
periodSeconds: 3
|
||||||
|
volumeMounts:
|
||||||
|
- name: config
|
||||||
|
mountPath: /home/step/.step/config
|
||||||
|
readOnly: true
|
||||||
|
- name: certs
|
||||||
|
mountPath: /home/step/.step/certs
|
||||||
|
readOnly: true
|
||||||
|
- name: secrets
|
||||||
|
mountPath: /home/step/.step/secrets
|
||||||
|
readOnly: true
|
||||||
|
- name: ca-password
|
||||||
|
mountPath: /home/step/password
|
||||||
|
readOnly: true
|
||||||
|
securityContext:
|
||||||
|
runAsUser: 1000
|
||||||
|
allowPrivilegeEscalation: false
|
||||||
|
volumes:
|
||||||
|
- name: certs
|
||||||
|
configMap:
|
||||||
|
name: certs
|
||||||
|
- name: config
|
||||||
|
configMap:
|
||||||
|
name: config
|
||||||
|
- name: secrets
|
||||||
|
configMap:
|
||||||
|
name: secrets
|
||||||
|
- name: ca-password
|
||||||
|
secret:
|
||||||
|
secretName: ca-password
|
||||||
106
autocert/install/02-autocert.yaml
Normal file
106
autocert/install/02-autocert.yaml
Normal file
|
|
@ -0,0 +1,106 @@
|
||||||
|
apiVersion: v1
|
||||||
|
kind: Service
|
||||||
|
metadata:
|
||||||
|
labels: {app: autocert}
|
||||||
|
name: autocert
|
||||||
|
namespace: step
|
||||||
|
spec:
|
||||||
|
type: ClusterIP
|
||||||
|
ports:
|
||||||
|
- port: 443
|
||||||
|
targetPort: 4443
|
||||||
|
selector: {app: autocert}
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
apiVersion: v1
|
||||||
|
kind: ConfigMap
|
||||||
|
metadata:
|
||||||
|
name: autocert-config
|
||||||
|
namespace: step
|
||||||
|
data:
|
||||||
|
config.yaml: |
|
||||||
|
logFormat: json # or text
|
||||||
|
caUrl: https://ca.step.svc.cluster.local
|
||||||
|
certLifetime: 24h
|
||||||
|
renewer:
|
||||||
|
name: autocert-renewer
|
||||||
|
image: smallstep/autocert-renewer:0.8.3
|
||||||
|
resources: {requests: {cpu: 10m, memory: 20Mi}}
|
||||||
|
imagePullPolicy: IfNotPresent
|
||||||
|
volumeMounts:
|
||||||
|
- name: certs
|
||||||
|
mountPath: /var/run/autocert.step.sm
|
||||||
|
bootstrapper:
|
||||||
|
name: autocert-bootstrapper
|
||||||
|
image: smallstep/autocert-bootstrapper:0.8.3
|
||||||
|
resources: {requests: {cpu: 10m, memory: 20Mi}}
|
||||||
|
imagePullPolicy: IfNotPresent
|
||||||
|
volumeMounts:
|
||||||
|
- name: certs
|
||||||
|
mountPath: /var/run/autocert.step.sm
|
||||||
|
certsVolume:
|
||||||
|
name: certs
|
||||||
|
emptyDir: {}
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
apiVersion: apps/v1
|
||||||
|
kind: Deployment
|
||||||
|
metadata:
|
||||||
|
name: autocert
|
||||||
|
namespace: step
|
||||||
|
labels: {app: autocert}
|
||||||
|
spec:
|
||||||
|
replicas: 1
|
||||||
|
selector: {matchLabels: {app: autocert}}
|
||||||
|
template:
|
||||||
|
metadata: {labels: {app: autocert}}
|
||||||
|
spec:
|
||||||
|
containers:
|
||||||
|
- name: autocert
|
||||||
|
image: smallstep/autocert-controller:0.8.3
|
||||||
|
resources: {requests: {cpu: 100m, memory: 20Mi}}
|
||||||
|
env:
|
||||||
|
- name: PROVISIONER_NAME
|
||||||
|
value: autocert
|
||||||
|
- name: NAMESPACE
|
||||||
|
valueFrom:
|
||||||
|
fieldRef:
|
||||||
|
fieldPath: metadata.namespace
|
||||||
|
volumeMounts:
|
||||||
|
- name: config
|
||||||
|
mountPath: /home/step/.step/config
|
||||||
|
readOnly: true
|
||||||
|
- name: certs
|
||||||
|
mountPath: /home/step/.step/certs
|
||||||
|
readOnly: true
|
||||||
|
- name: autocert-password
|
||||||
|
mountPath: /home/step/password
|
||||||
|
readOnly: true
|
||||||
|
- name: autocert-config
|
||||||
|
mountPath: /home/step/autocert
|
||||||
|
readOnly: true
|
||||||
|
securityContext:
|
||||||
|
runAsUser: 1000
|
||||||
|
allowPrivilegeEscalation: false
|
||||||
|
livenessProbe:
|
||||||
|
httpGet:
|
||||||
|
path: /healthz
|
||||||
|
port: 4443
|
||||||
|
scheme: HTTPS
|
||||||
|
readinessProbe:
|
||||||
|
httpGet:
|
||||||
|
path: /healthz
|
||||||
|
port: 4443
|
||||||
|
scheme: HTTPS
|
||||||
|
volumes:
|
||||||
|
- name: config
|
||||||
|
configMap: {name: config}
|
||||||
|
- name: certs
|
||||||
|
configMap: {name: certs}
|
||||||
|
- name: autocert-password
|
||||||
|
secret: {secretName: autocert-password}
|
||||||
|
- name: autocert-config
|
||||||
|
configMap: {name: autocert-config}
|
||||||
|
|
||||||
36
autocert/install/03-rbac.yaml
Normal file
36
autocert/install/03-rbac.yaml
Normal file
|
|
@ -0,0 +1,36 @@
|
||||||
|
# Create a ClusterRole for managing autocert secrets, which should
|
||||||
|
# only exist in namespaces with autocert enabled and should always
|
||||||
|
# be labeled `autocert.step.sm/token: true`.
|
||||||
|
#
|
||||||
|
# To create this ClusterRole you need cluster-admin privileges. On
|
||||||
|
# GKE you can give yourself cluster-admin privileges using the
|
||||||
|
# following command:
|
||||||
|
#
|
||||||
|
# kubectl create clusterrolebinding cluster-admin-binding \
|
||||||
|
# --clusterrole cluster-admin \
|
||||||
|
# --user $(gcloud config get-value account)
|
||||||
|
|
||||||
|
apiVersion: rbac.authorization.k8s.io/v1
|
||||||
|
kind: ClusterRole
|
||||||
|
metadata:
|
||||||
|
name: autocert-secret-management
|
||||||
|
rules:
|
||||||
|
- apiGroups: [""]
|
||||||
|
resources: ["secrets"]
|
||||||
|
verbs: ["create", "delete"]
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
apiVersion: rbac.authorization.k8s.io/v1
|
||||||
|
kind: ClusterRoleBinding
|
||||||
|
metadata:
|
||||||
|
name: autocert-secret-management
|
||||||
|
roleRef:
|
||||||
|
apiGroup: rbac.authorization.k8s.io
|
||||||
|
kind: ClusterRole
|
||||||
|
name: autocert-secret-management
|
||||||
|
subjects:
|
||||||
|
- kind: ServiceAccount
|
||||||
|
name: default
|
||||||
|
namespace: step
|
||||||
|
|
||||||
8
autocert/renewer/Dockerfile
Normal file
8
autocert/renewer/Dockerfile
Normal file
|
|
@ -0,0 +1,8 @@
|
||||||
|
FROM smallstep/step-cli:0.8.3
|
||||||
|
|
||||||
|
USER root
|
||||||
|
ENV CRT="/var/run/autocert.step.sm/site.crt"
|
||||||
|
ENV KEY="/var/run/autocert.step.sm/site.key"
|
||||||
|
ENV STEP_ROOT="/var/run/autocert.step.sm/root.crt"
|
||||||
|
|
||||||
|
ENTRYPOINT ["/bin/bash", "-c", "step ca renew --daemon $CRT $KEY"]
|
||||||
Loading…
Reference in a new issue