forked from TrueCloudLab/certificates
351c01cf7e
* Do not allow pods in one namespace to create certificates for hostnames from another namespace. * Make cluster domain configurable, clean up shouldMutate() logic, and make namespace restrictions configurable with restrictCertificatesToNamespace. * Return certificate hostname validation errors in the admission webhook response. * Appease the gometalinter.
647 lines
19 KiB
Go
647 lines
19 KiB
Go
package main
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import (
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"context"
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"crypto/sha256"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net/http"
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"os"
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"strings"
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"time"
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"github.com/ghodss/yaml"
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"github.com/pkg/errors"
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log "github.com/sirupsen/logrus"
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"github.com/smallstep/certificates/ca"
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"github.com/smallstep/cli/crypto/pemutil"
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"k8s.io/api/admission/v1beta1"
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corev1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/serializer"
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)
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var (
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runtimeScheme = runtime.NewScheme()
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codecs = serializer.NewCodecFactory(runtimeScheme)
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deserializer = codecs.UniversalDeserializer()
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// GetRootCAPath() is broken; points to secrets not certs. So
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// we'll hard code instead for now.
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//rootCAPath = pki.GetRootCAPath()
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rootCAPath = "/home/step/.step/certs/root_ca.crt"
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)
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const (
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admissionWebhookAnnotationKey = "autocert.step.sm/name"
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admissionWebhookStatusKey = "autocert.step.sm/status"
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provisionerPasswordFile = "/home/step/password/password"
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volumeMountPath = "/var/run/autocert.step.sm"
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tokenSecretKey = "token"
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tokenSecretLabel = "autocert.step.sm/token"
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)
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// Config options for the autocert admission controller.
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type Config struct {
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LogFormat string `yaml:"logFormat"`
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CaURL string `yaml:"caUrl"`
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CertLifetime string `yaml:"certLifetime"`
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Bootstrapper corev1.Container `yaml:"bootstrapper"`
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Renewer corev1.Container `yaml:"renewer"`
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CertsVolume corev1.Volume `yaml:"certsVolume"`
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RestrictCertificatesToNamespace bool `yaml:"restrictCertificatesToNamespace"`
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ClusterDomain string `yaml:"clusterDomain"`
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}
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// GetClusterDomain returns the Kubernetes cluster domain, defaults to
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// "cluster.local" if not specified in the configuration.
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func (c Config) GetClusterDomain() string {
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if c.ClusterDomain != "" {
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return c.ClusterDomain
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}
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return "cluster.local"
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}
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// PatchOperation represents a RFC6902 JSONPatch Operation
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type PatchOperation struct {
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Op string `json:"op"`
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Path string `json:"path"`
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Value interface{} `json:"value,omitempty"`
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}
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// RFC6901 JSONPath Escaping -- https://tools.ietf.org/html/rfc6901
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func escapeJSONPath(path string) string {
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// Replace`~` with `~0` then `/` with `~1`. Note that the order
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// matters otherwise we'll turn a `/` into a `~/`.
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path = strings.Replace(path, "~", "~0", -1)
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path = strings.Replace(path, "/", "~1", -1)
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return path
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}
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func loadConfig(file string) (*Config, error) {
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data, err := ioutil.ReadFile(file)
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if err != nil {
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return nil, err
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}
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var cfg Config
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if err := yaml.Unmarshal(data, &cfg); err != nil {
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return nil, err
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}
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return &cfg, nil
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}
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// createTokenSecret generates a kubernetes Secret object containing a bootstrap token
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// in the specified namespce. The secret name is randomly generated with a given prefix.
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// A goroutine is scheduled to cleanup the secret after the token expires. The secret
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// is also labelled for easy identification and manual cleanup.
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func createTokenSecret(prefix, namespace, token string) (string, error) {
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secret := corev1.Secret{
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TypeMeta: metav1.TypeMeta{
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Kind: "Secret",
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APIVersion: "v1",
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},
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ObjectMeta: metav1.ObjectMeta{
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GenerateName: prefix,
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Namespace: namespace,
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Labels: map[string]string{
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tokenSecretLabel: "true",
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},
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},
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StringData: map[string]string{
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tokenSecretKey: token,
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},
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Type: corev1.SecretTypeOpaque,
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}
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client, err := NewInClusterK8sClient()
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if err != nil {
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return "", err
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}
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body, err := json.Marshal(secret)
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if err != nil {
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return "", err
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}
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log.WithField("secret", string(body)).Debug("Creating secret")
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req, err := client.PostRequest(fmt.Sprintf("api/v1/namespaces/%s/secrets", namespace), string(body), "application/json")
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if err != nil {
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return "", err
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}
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resp, err := client.Do(req)
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if err != nil {
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log.Errorf("Secret creation error. Response: %v", resp)
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return "", errors.Wrap(err, "secret creation")
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}
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if resp.StatusCode < 200 || resp.StatusCode >= 300 {
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log.Errorf("Secret creation error (!2XX). Response: %v", resp)
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var rbody []byte
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if resp.Body != nil {
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if data, err := ioutil.ReadAll(resp.Body); err == nil {
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rbody = data
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}
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}
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log.Error("Error body: ", string(rbody))
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return "", errors.New("Not 200")
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}
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var rbody []byte
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if resp.Body != nil {
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if data, err := ioutil.ReadAll(resp.Body); err == nil {
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rbody = data
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}
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}
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if len(rbody) == 0 {
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return "", errors.New("Empty response body")
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}
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var created *corev1.Secret
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if err := json.Unmarshal(rbody, &created); err != nil {
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return "", errors.Wrap(err, "Error unmarshalling secret response")
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}
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// Clean up after ourselves by deleting the Secret after the bootstrap
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// token expires. This is best effort -- obviously we'll miss some stuff
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// if this process goes away -- but the secrets are also labelled so
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// it's also easy to clean them up in bulk using kubectl if we miss any.
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go func() {
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time.Sleep(tokenLifetime)
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req, err := client.DeleteRequest(fmt.Sprintf("api/v1/namespaces/%s/secrets/%s", namespace, created.Name))
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ctxLog := log.WithFields(log.Fields{
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"name": created.Name,
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"namespace": namespace,
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})
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if err != nil {
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ctxLog.WithField("error", err).Error("Error deleting expired boostrap token secret")
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return
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}
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resp, err := client.Do(req)
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if err != nil {
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ctxLog.WithField("error", err).Error("Error deleting expired boostrap token secret")
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return
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}
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if resp.StatusCode < 200 || resp.StatusCode >= 300 {
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ctxLog.WithFields(log.Fields{
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"status": resp.Status,
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"statusCode": resp.StatusCode,
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}).Error("Error deleting expired boostrap token secret")
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return
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}
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ctxLog.Info("Deleted expired bootstrap token secret")
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}()
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return created.Name, err
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}
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// mkBootstrapper generates a bootstrap container based on the template defined in Config. It
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// generates a new bootstrap token and mounts it, along with other required coniguration, as
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// environment variables in the returned bootstrap container.
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func mkBootstrapper(config *Config, commonName string, namespace string, provisioner Provisioner) (corev1.Container, error) {
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b := config.Bootstrapper
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token, err := provisioner.Token(commonName)
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if err != nil {
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return b, errors.Wrap(err, "token generation")
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}
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// Generate CA fingerprint
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crt, err := pemutil.ReadCertificate(rootCAPath)
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if err != nil {
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return b, errors.Wrap(err, "CA fingerprint")
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}
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sum := sha256.Sum256(crt.Raw)
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fingerprint := strings.ToLower(hex.EncodeToString(sum[:]))
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secretName, err := createTokenSecret(commonName+"-", namespace, token)
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if err != nil {
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return b, errors.Wrap(err, "create token secret")
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}
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log.Infof("Secret name is: %s", secretName)
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b.Env = append(b.Env, corev1.EnvVar{
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Name: "COMMON_NAME",
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Value: commonName,
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})
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b.Env = append(b.Env, corev1.EnvVar{
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Name: "STEP_TOKEN",
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ValueFrom: &corev1.EnvVarSource{
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SecretKeyRef: &corev1.SecretKeySelector{
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LocalObjectReference: corev1.LocalObjectReference{
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Name: secretName,
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},
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Key: tokenSecretKey,
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},
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},
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})
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b.Env = append(b.Env, corev1.EnvVar{
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Name: "STEP_CA_URL",
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Value: config.CaURL,
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})
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b.Env = append(b.Env, corev1.EnvVar{
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Name: "STEP_FINGERPRINT",
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Value: fingerprint,
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})
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b.Env = append(b.Env, corev1.EnvVar{
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Name: "STEP_NOT_AFTER",
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Value: config.CertLifetime,
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})
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return b, nil
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}
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// mkRenewer generates a new renewer based on the template provided in Config.
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func mkRenewer(config *Config) corev1.Container {
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r := config.Renewer
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r.Env = append(r.Env, corev1.EnvVar{
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Name: "STEP_CA_URL",
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Value: config.CaURL,
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})
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return r
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}
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func addContainers(existing, new []corev1.Container, path string) (ops []PatchOperation) {
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if len(existing) == 0 {
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return []PatchOperation{
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{
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Op: "add",
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Path: path,
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Value: new,
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},
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}
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}
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for _, add := range new {
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ops = append(ops, PatchOperation{
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Op: "add",
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Path: path + "/-",
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Value: add,
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})
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}
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return ops
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}
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func addVolumes(existing, new []corev1.Volume, path string) (ops []PatchOperation) {
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if len(existing) == 0 {
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return []PatchOperation{
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{
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Op: "add",
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Path: path,
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Value: new,
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},
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}
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}
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for _, add := range new {
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ops = append(ops, PatchOperation{
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Op: "add",
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Path: path + "/-",
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Value: add,
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})
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}
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return ops
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}
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func addCertsVolumeMount(volumeName string, containers []corev1.Container) (ops []PatchOperation) {
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volumeMount := corev1.VolumeMount{
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Name: volumeName,
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MountPath: volumeMountPath,
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ReadOnly: true,
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}
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for i, container := range containers {
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if len(container.VolumeMounts) == 0 {
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ops = append(ops, PatchOperation{
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Op: "add",
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Path: fmt.Sprintf("/spec/containers/%v/volumeMounts", i),
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Value: []corev1.VolumeMount{volumeMount},
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})
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} else {
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ops = append(ops, PatchOperation{
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Op: "add",
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Path: fmt.Sprintf("/spec/containers/%v/volumeMounts/-", i),
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Value: volumeMount,
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})
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}
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}
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return ops
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}
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func addAnnotations(existing, new map[string]string) (ops []PatchOperation) {
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if len(existing) == 0 {
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return []PatchOperation{
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{
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Op: "add",
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Path: "/metadata/annotations",
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Value: new,
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},
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}
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}
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for k, v := range new {
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if existing[k] == "" {
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ops = append(ops, PatchOperation{
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Op: "add",
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Path: "/metadata/annotations/" + escapeJSONPath(k),
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Value: v,
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})
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} else {
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ops = append(ops, PatchOperation{
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Op: "replace",
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Path: "/metadata/annotations/" + escapeJSONPath(k),
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Value: v,
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})
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}
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}
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return ops
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}
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// patch produces a list of patches to apply to a pod to inject a certificate. In particular,
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// we patch the pod in order to:
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// - Mount the `certs` volume in existing containers defined in the pod
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// - Add the autocert-renewer as a container (a sidecar)
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// - Add the autocert-bootstrapper as an initContainer
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// - Add the `certs` volume definition
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// - Annotate the pod to indicate that it's been processed by this controller
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// The result is a list of serialized JSONPatch objects (or an error).
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func patch(pod *corev1.Pod, namespace string, config *Config, provisioner Provisioner) ([]byte, error) {
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var ops []PatchOperation
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annotations := pod.ObjectMeta.GetAnnotations()
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commonName := annotations[admissionWebhookAnnotationKey]
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renewer := mkRenewer(config)
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bootstrapper, err := mkBootstrapper(config, commonName, namespace, provisioner)
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if err != nil {
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return nil, err
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}
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ops = append(ops, addCertsVolumeMount(config.CertsVolume.Name, pod.Spec.Containers)...)
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ops = append(ops, addContainers(pod.Spec.Containers, []corev1.Container{renewer}, "/spec/containers")...)
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ops = append(ops, addContainers(pod.Spec.InitContainers, []corev1.Container{bootstrapper}, "/spec/initContainers")...)
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ops = append(ops, addVolumes(pod.Spec.Volumes, []corev1.Volume{config.CertsVolume}, "/spec/volumes")...)
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ops = append(ops, addAnnotations(pod.Annotations, map[string]string{admissionWebhookStatusKey: "injected"})...)
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return json.Marshal(ops)
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}
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// shouldMutate checks whether a pod is subject to mutation by this admission controller. A pod
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// is subject to mutation if it's annotated with the `admissionWebhookAnnotationKey` and if it
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// has not already been processed (indicated by `admissionWebhookStatusKey` set to `injected`).
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// If the pod requests a certificate with a subject matching a namespace other than its own
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// and restrictToNamespace is true, then shouldMutate will return a validation error
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// that should be returned to the client.
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func shouldMutate(metadata *metav1.ObjectMeta, namespace string, clusterDomain string, restrictToNamespace bool) (bool, error) {
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annotations := metadata.GetAnnotations()
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if annotations == nil {
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annotations = map[string]string{}
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}
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// Only mutate if the object is annotated appropriately (annotation key set) and we haven't
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// mutated already (status key isn't set).
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if annotations[admissionWebhookAnnotationKey] == "" || annotations[admissionWebhookStatusKey] == "injected" {
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return false, nil
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}
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if !restrictToNamespace {
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return true, nil
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}
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subject := strings.Trim(annotations[admissionWebhookAnnotationKey], ".")
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err := fmt.Errorf("subject \"%s\" matches a namespace other than \"%s\" and is not permitted. This check can be disabled by setting restrictCertificatesToNamespace to false in the autocert-config ConfigMap", subject, namespace)
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if strings.HasSuffix(subject, ".svc") && !strings.HasSuffix(subject, fmt.Sprintf(".%s.svc", namespace)) {
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return false, err
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}
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if strings.HasSuffix(subject, fmt.Sprintf(".svc.%s", clusterDomain)) && !strings.HasSuffix(subject, fmt.Sprintf(".%s.svc.%s", namespace, clusterDomain)) {
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return false, err
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}
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return true, nil
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}
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// mutate takes an `AdmissionReview`, determines whether it is subject to mutation, and returns
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// an appropriate `AdmissionResponse` including patches or any errors that occurred.
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func mutate(review *v1beta1.AdmissionReview, config *Config, provisioner Provisioner) *v1beta1.AdmissionResponse {
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ctxLog := log.WithField("uid", review.Request.UID)
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request := review.Request
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var pod corev1.Pod
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if err := json.Unmarshal(request.Object.Raw, &pod); err != nil {
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ctxLog.WithField("error", err).Error("Error unmarshalling pod")
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return &v1beta1.AdmissionResponse{
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Allowed: false,
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UID: request.UID,
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Result: &metav1.Status{
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Message: err.Error(),
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},
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}
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}
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ctxLog = ctxLog.WithFields(log.Fields{
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"kind": request.Kind,
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"operation": request.Operation,
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"name": pod.Name,
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"generateName": pod.GenerateName,
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"namespace": request.Namespace,
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"user": request.UserInfo,
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})
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mutationAllowed, validationErr := shouldMutate(&pod.ObjectMeta, request.Namespace, config.GetClusterDomain(), config.RestrictCertificatesToNamespace)
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if validationErr != nil {
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ctxLog.WithField("error", validationErr).Info("Validation error")
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return &v1beta1.AdmissionResponse{
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Allowed: false,
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UID: request.UID,
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Result: &metav1.Status{
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Message: validationErr.Error(),
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},
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}
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}
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if !mutationAllowed {
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ctxLog.WithField("annotations", pod.Annotations).Info("Skipping mutation")
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return &v1beta1.AdmissionResponse{
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Allowed: true,
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UID: request.UID,
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}
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}
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patchBytes, err := patch(&pod, request.Namespace, config, provisioner)
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if err != nil {
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ctxLog.WithField("error", err).Error("Error generating patch")
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return &v1beta1.AdmissionResponse{
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Allowed: false,
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UID: request.UID,
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Result: &metav1.Status{
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Message: err.Error(),
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},
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}
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}
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ctxLog.WithField("patch", string(patchBytes)).Info("Generated patch")
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return &v1beta1.AdmissionResponse{
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Allowed: true,
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Patch: patchBytes,
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UID: request.UID,
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PatchType: func() *v1beta1.PatchType {
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pt := v1beta1.PatchTypeJSONPatch
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return &pt
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}(),
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}
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}
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func main() {
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if len(os.Args) != 2 {
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log.Errorf("Usage: %s <config>\n", os.Args[0])
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os.Exit(1)
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}
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config, err := loadConfig(os.Args[1])
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if err != nil {
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panic(err)
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}
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log.SetOutput(os.Stdout)
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if config.LogFormat == "json" {
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log.SetFormatter(&log.JSONFormatter{})
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}
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if config.LogFormat == "text" {
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log.SetFormatter(&log.TextFormatter{})
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}
|
|
|
|
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)
|
|
}
|
|
}
|