124 lines
4.1 KiB
Go
124 lines
4.1 KiB
Go
// Copyright 2020 the Pinniped contributors. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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package supervisorconfig
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import (
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"crypto/tls"
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"fmt"
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"net/url"
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"strings"
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"k8s.io/apimachinery/pkg/labels"
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corev1informers "k8s.io/client-go/informers/core/v1"
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"k8s.io/klog/v2"
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"go.pinniped.dev/generated/1.19/client/supervisor/informers/externalversions/config/v1alpha1"
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pinnipedcontroller "go.pinniped.dev/internal/controller"
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"go.pinniped.dev/internal/controllerlib"
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)
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type tlsCertObserverController struct {
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issuerTLSCertSetter IssuerTLSCertSetter
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defaultTLSCertificateSecretName string
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oidcProviderInformer v1alpha1.OIDCProviderInformer
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secretInformer corev1informers.SecretInformer
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}
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type IssuerTLSCertSetter interface {
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SetIssuerHostToTLSCertMap(issuerHostToTLSCertMap map[string]*tls.Certificate)
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SetDefaultTLSCert(certificate *tls.Certificate)
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}
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func NewTLSCertObserverController(
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issuerTLSCertSetter IssuerTLSCertSetter,
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defaultTLSCertificateSecretName string,
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secretInformer corev1informers.SecretInformer,
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oidcProviderInformer v1alpha1.OIDCProviderInformer,
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withInformer pinnipedcontroller.WithInformerOptionFunc,
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) controllerlib.Controller {
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return controllerlib.New(
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controllerlib.Config{
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Name: "tls-certs-observer-controller",
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Syncer: &tlsCertObserverController{
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issuerTLSCertSetter: issuerTLSCertSetter,
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defaultTLSCertificateSecretName: defaultTLSCertificateSecretName,
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oidcProviderInformer: oidcProviderInformer,
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secretInformer: secretInformer,
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},
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},
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withInformer(
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secretInformer,
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pinnipedcontroller.MatchAnythingFilter(),
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controllerlib.InformerOption{},
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),
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withInformer(
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oidcProviderInformer,
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pinnipedcontroller.MatchAnythingFilter(),
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controllerlib.InformerOption{},
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),
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)
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}
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func (c *tlsCertObserverController) Sync(ctx controllerlib.Context) error {
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ns := ctx.Key.Namespace
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allProviders, err := c.oidcProviderInformer.Lister().OIDCProviders(ns).List(labels.Everything())
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if err != nil {
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return fmt.Errorf("failed to list OIDCProviders: %w", err)
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}
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// Rebuild the whole map on any change to any Secret or OIDCProvider, because either can have changes that
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// can cause the map to need to be updated.
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issuerHostToTLSCertMap := map[string]*tls.Certificate{}
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for _, provider := range allProviders {
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secretName := ""
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if provider.Spec.TLS != nil {
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secretName = provider.Spec.TLS.SecretName
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}
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issuerURL, err := url.Parse(provider.Spec.Issuer)
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if err != nil {
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klog.InfoS("tlsCertObserverController Sync found an invalid issuer URL", "namespace", ns, "issuer", provider.Spec.Issuer)
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continue
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}
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certFromSecret, err := c.certFromSecret(ns, secretName)
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if err != nil {
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continue
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}
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// Lowercase the host part of the URL because hostnames should be treated as case-insensitive.
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issuerHostToTLSCertMap[lowercaseHostWithoutPort(issuerURL)] = certFromSecret
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}
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klog.InfoS("tlsCertObserverController Sync updated the TLS cert cache", "issuerHostCount", len(issuerHostToTLSCertMap))
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c.issuerTLSCertSetter.SetIssuerHostToTLSCertMap(issuerHostToTLSCertMap)
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defaultCert, err := c.certFromSecret(ns, c.defaultTLSCertificateSecretName)
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if err != nil {
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c.issuerTLSCertSetter.SetDefaultTLSCert(nil)
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} else {
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c.issuerTLSCertSetter.SetDefaultTLSCert(defaultCert)
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}
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return nil
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}
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func (c *tlsCertObserverController) certFromSecret(ns string, secretName string) (*tls.Certificate, error) {
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tlsSecret, err := c.secretInformer.Lister().Secrets(ns).Get(secretName)
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if err != nil {
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klog.InfoS("tlsCertObserverController Sync could not find TLS cert secret", "namespace", ns, "secretName", secretName)
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return nil, err
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}
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certFromSecret, err := tls.X509KeyPair(tlsSecret.Data["tls.crt"], tlsSecret.Data["tls.key"])
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if err != nil {
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klog.InfoS("tlsCertObserverController Sync found a TLS secret with Data in an unexpected format", "namespace", ns, "secretName", secretName)
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return nil, err
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}
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return &certFromSecret, nil
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}
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func lowercaseHostWithoutPort(issuerURL *url.URL) string {
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lowercaseHost := strings.ToLower(issuerURL.Host)
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colonSegments := strings.Split(lowercaseHost, ":")
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return colonSegments[0]
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}
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