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certs.go
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certs.go
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package tls
import (
"context"
"crypto/x509"
"encoding/pem"
"fmt"
"strings"
"time"
"github.com/acorn-io/baaah/pkg/router"
"github.com/acorn-io/runtime/pkg/labels"
"github.com/acorn-io/runtime/pkg/system"
"github.com/sirupsen/logrus"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
klabels "k8s.io/apimachinery/pkg/labels"
kclient "sigs.k8s.io/controller-runtime/pkg/client"
)
// ProvisionWildcardCert provisions a Let's Encrypt wildcard certificate for *.<domain>.oss-acorn.io
func ProvisionWildcardCert(req router.Request, resp router.Response, domain, token string) error {
logrus.Debugf("Provisioning wildcard cert for %v", domain)
// Ensure that we have a Let's Encrypt account ready
leUser, err := ensureLEUser(req.Ctx, req.Client)
if err != nil {
logrus.Errorf("failed to get/create lets-encrypt account in ProvisionWildcardCert: %v", err)
resp.RetryAfter(15 * time.Second)
return nil
}
wildcardDomain := fmt.Sprintf("*.%s", strings.TrimPrefix(domain, "."))
// Generate wildcard certificate for domain
return leUser.provisionCertIfNotExists(req.Ctx, req.Client, wildcardDomain, system.Namespace, system.TLSSecretName)
}
// RequireSecretTypeTLS is a middleware that ensures that we only act on TLS-Type secrets
func RequireSecretTypeTLS(h router.Handler) router.Handler {
return router.HandlerFunc(func(req router.Request, resp router.Response) error {
sec := req.Object.(*corev1.Secret)
if sec.Type != corev1.SecretTypeTLS {
return nil
}
return h.Handle(req, resp)
})
}
// RenewCert handles the renewal of existing TLS certificates
func RenewCert(req router.Request, resp router.Response) error {
sec := req.Object.(*corev1.Secret)
leUser, err := ensureLEUser(req.Ctx, req.Client)
if err != nil {
logrus.Errorf("failed to get/create lets-encrypt account in RenewCert: %v", err)
resp.RetryAfter(15 * time.Second)
return nil
}
// Early exit if existing cert is still valid
if !leUser.mustRenew(sec) {
logrus.Debugf("Certificate for %v is still valid", sec.Name)
return nil
}
domain := sec.Annotations[labels.AcornDomain]
if domain == "" {
return nil
}
go func() {
// Do not start a new challenge if we already have one in progress
if !lockDomain(domain) {
logrus.Debugf("not starting certificate renewal: %v: %s", ErrCertificateRequestInProgress, domain)
return
}
defer unlockDomain(domain)
logrus.Infof("Renewing TLS cert for %s", domain)
// Get new certificate
cert, err := leUser.getCert(req.Ctx, domain)
if err != nil {
logrus.Errorf("Error getting cert for %v: %v", domain, err)
return
}
// Convert cert to secret
newSec, err := leUser.certToSecret(cert, domain, sec.Namespace, sec.Name)
if err != nil {
logrus.Errorf("Error converting cert to secret: %v", err)
return
}
// Update existing secret
if err := req.Client.Update(req.Ctx, newSec); err != nil {
logrus.Errorf("Error updating secret: %v", err)
return
}
logrus.Infof("TLS secret %s/%s renewed for domain %s", newSec.Namespace, newSec.Name, domain)
}()
return nil
}
// certFromSecret converts TLS secret data to a TLS certificate
func certFromSecret(secret corev1.Secret) (*x509.Certificate, error) {
tlsPEM, ok := secret.Data["tls.crt"]
if !ok {
return nil, fmt.Errorf("key tls.crt not found in secret %s/%s", secret.Namespace, secret.Name)
}
tlsCertBytes, _ := pem.Decode(tlsPEM)
if tlsCertBytes == nil {
return nil, fmt.Errorf("failed to parse Cert PEM stored in secret %s/%s", secret.Namespace, secret.Name)
}
return x509.ParseCertificate(tlsCertBytes.Bytes)
}
// findExistingCert returns the first TLS secret that matches the given domain
func findExistingCertSecret(ctx context.Context, client kclient.Client, target string) (*corev1.Secret, error) {
// Find existing certificate if exists
existingTLSSecrets := &corev1.SecretList{}
if err := client.List(ctx, existingTLSSecrets, &kclient.ListOptions{LabelSelector: klabels.SelectorFromSet(map[string]string{
labels.AcornManaged: "true",
})}); err != nil {
logrus.Errorf("Error listing existing TLS secrets: %v", err)
}
for _, sec := range existingTLSSecrets.Items {
logrus.Debugf("Found existing TLS secret: %s/%s", sec.Namespace, sec.Name)
if sec.Type != corev1.SecretTypeTLS {
continue
}
domain, ok := sec.Annotations[labels.AcornDomain]
if !ok {
continue
}
if domain == target {
cert, err := certFromSecret(sec)
if err != nil {
logrus.Errorf("Error parsing cert from secret: %v", err)
continue
}
if err := cert.VerifyHostname(target); err == nil {
return &sec, nil
}
}
}
return nil, nil
}
func (u *LEUser) provisionCertIfNotExists(ctx context.Context, client kclient.Client, domain string, namespace string, secretName string) error {
// Find existing secret by expected name
existingSecret := &corev1.Secret{}
findSecretErr := client.Get(ctx, router.Key(namespace, secretName), existingSecret)
var mustUpdate bool
if findSecretErr == nil {
if existingSecret.Annotations[labels.AcornDomain] == domain {
// Skip: TLS secret already exists and matches the domain, nothing to do here, renewal will be handled elsewhere
logrus.Debugf("No need to provision cert for domain %s, secret for that domain already exists: %s/%s", domain, existingSecret.Namespace, existingSecret.Name)
return nil
}
// There's an existing secret with a different domain but matching the expected name, so we'll update it
logrus.Debugf("Updating existing secret %s/%s with domain %s to %s", existingSecret.Namespace, existingSecret.Name, existingSecret.Annotations[labels.AcornDomain], domain)
mustUpdate = true
} else if !apierrors.IsNotFound(findSecretErr) {
// Not found is ok, we'll create the secret below.. other errors are bad
return fmt.Errorf("Error getting certificate secret %s/%s: %w", namespace, secretName, findSecretErr)
}
if !mustUpdate {
// Let's see if we have some existing certificate that matches the domain
existingSecret, err := findExistingCertSecret(ctx, client, domain)
if err != nil {
return err
}
if existingSecret != nil {
// We found an existing certificate
// 1. It's in the same namespace, so it will be picked up automatically
if existingSecret.Namespace == namespace {
logrus.Debugf("Found existing TLS secret %s/%s for domain %s", existingSecret.Namespace, existingSecret.Name, domain)
// Skip: TLS secret already exists, nothing to do here, renewal will be handled elsewhere
return nil
}
logrus.Debugf("Found existing TLS secret %s/%s for domain %s, copying to %s/%s", existingSecret.Namespace, existingSecret.Name, domain, namespace, secretName)
// 2. Copy secret to new namespace
copiedSecret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: secretName,
Namespace: namespace,
Labels: map[string]string{
labels.AcornManaged: "true",
},
Annotations: map[string]string{
labels.AcornDomain: domain,
},
},
Data: existingSecret.Data,
Type: existingSecret.Type,
}
if err := client.Create(ctx, copiedSecret); err != nil {
return fmt.Errorf("Error creating TLS secret %s/%s: %w", copiedSecret.Namespace, copiedSecret.Name, err)
}
return nil
}
}
go func() {
// Do not start a new challenge if we already have one in progress
if !lockDomain(domain) {
logrus.Debugf("not starting certificate renewal: %v: %s", ErrCertificateRequestInProgress, domain)
return
}
defer unlockDomain(domain)
logrus.Infof("Provisioning TLS cert for %s in secret %s/%s", domain, namespace, secretName)
cert, err := u.getCert(ctx, domain)
if err != nil {
logrus.Errorf("Error getting cert for %s: %v", domain, err)
return
}
newSec, err := u.certToSecret(cert, domain, namespace, secretName)
if err != nil {
logrus.Errorf("Error converting cert to secret: %v", err)
return
}
if mustUpdate {
if err := client.Update(ctx, newSec); err != nil {
logrus.Errorf("error updating TLS secret %s/%s: %v", namespace, secretName, err)
return
}
logrus.Infof("TLS secret %s/%s updated for domain %s", namespace, secretName, domain)
return
}
if err := client.Create(ctx, newSec); err != nil {
logrus.Errorf("error creating TLS secret %s/%s: %v", namespace, secretName, err)
return
}
logrus.Infof("TLS secret %s/%s created for domain %s", namespace, secretName, domain)
}()
return nil
}