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tls.go
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tls.go
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// Copyright The Cryostat Authors
//
// The Universal Permissive License (UPL), Version 1.0
//
// Subject to the condition set forth below, permission is hereby granted to any
// person obtaining a copy of this software, associated documentation and/or data
// (collectively the "Software"), free of charge and under any and all copyright
// rights in the Software, and any and all patent rights owned or freely
// licensable by each licensor hereunder covering either (i) the unmodified
// Software as contributed to or provided by such licensor, or (ii) the Larger
// Works (as defined below), to deal in both
//
// (a) the Software, and
// (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
// one is included with the Software (each a "Larger Work" to which the Software
// is contributed by such licensors),
//
// without restriction, including without limitation the rights to copy, create
// derivative works of, display, perform, and distribute the Software and make,
// use, sell, offer for sale, import, export, have made, and have sold the
// Software and the Larger Work(s), and to sublicense the foregoing rights on
// either these or other terms.
//
// This license is subject to the following condition:
// The above copyright notice and either this complete permission notice or at
// a minimum a reference to the UPL must be included in all copies or
// substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package common
import (
"context"
"errors"
"strings"
operatorv1beta1 "github.com/cryostatio/cryostat-operator/api/v1beta1"
certv1 "github.com/jetstack/cert-manager/pkg/apis/certmanager/v1"
certMeta "github.com/jetstack/cert-manager/pkg/apis/meta/v1"
corev1 "k8s.io/api/core/v1"
kerrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/types"
"sigs.k8s.io/controller-runtime/pkg/client"
)
// ReconcilerTLS contains methods a reconciler may wish to use when configuring
// TLS-related functionality
type ReconcilerTLS interface {
IsCertManagerEnabled() bool
GetCryostatCABytes(ctx context.Context, cryostat *operatorv1beta1.Cryostat) ([]byte, error)
GetCertificateSecret(ctx context.Context, name string, namespace string) (*corev1.Secret, error)
OSUtils
}
// ReconcilerTLSConfig contains parameters used to create a ReconcilerTLS
type ReconcilerTLSConfig struct {
// This client, initialized using mgr.Client(), is a split client
// that reads objects from the cache and writes to the apiserver
Client client.Client
// Optional field to override the default behaviour when interacting
// with the operating system
OSUtils
}
type reconcilerTLS struct {
*ReconcilerTLSConfig
}
// blank assignment to verify that tlsReconciler implements ReconcilerTLS
var _ ReconcilerTLS = &reconcilerTLS{}
// Environment variable to disable TLS for services
const disableServiceTLS = "DISABLE_SERVICE_TLS"
// NewReconcilerTLS creates a new ReconcilerTLS using the provided configuration
func NewReconcilerTLS(config *ReconcilerTLSConfig) ReconcilerTLS {
configCopy := *config
if config.OSUtils == nil {
configCopy.OSUtils = &defaultOSUtils{}
}
return &reconcilerTLS{
ReconcilerTLSConfig: &configCopy,
}
}
// IsCertManagerEnabled returns whether TLS using cert-manager is enabled
// for this operator
func (r *reconcilerTLS) IsCertManagerEnabled() bool {
// FIXME hardcoded off - new operator-sdk has cert-manager already set up
// somehow, with "CA injection"?
// Check if the user has explicitly requested cert-manager to be disabled
return strings.ToLower(r.GetEnv(disableServiceTLS)) != "true"
}
// ErrCertNotReady is returned when cert-manager has not marked the certificate
// as ready, and no TLS secret has been populated yet.
var ErrCertNotReady error = errors.New("Certificate secret not yet ready")
// GetCertificateSecret returns the Secret corresponding to the named
// cert-manager Certificate. This can return ErrCertNotReady if the
// certificate secret is not available yet.
func (r *reconcilerTLS) GetCertificateSecret(ctx context.Context, name string, namespace string) (*corev1.Secret, error) {
// Look up named certificate
cert := &certv1.Certificate{}
err := r.Client.Get(ctx, types.NamespacedName{Name: name, Namespace: namespace}, cert)
if err != nil {
if kerrors.IsNotFound(err) {
return nil, ErrCertNotReady
}
return nil, err
}
if !isCertificateReady(cert) {
return nil, ErrCertNotReady
}
secret := &corev1.Secret{}
err = r.Client.Get(ctx, types.NamespacedName{Name: cert.Spec.SecretName, Namespace: namespace}, secret)
if err != nil {
return nil, err
}
return secret, nil
}
// GetCryostatCABytes returns the CA certificate created for the provided
// Cryostat CR, as a byte slice.
func (r *reconcilerTLS) GetCryostatCABytes(ctx context.Context, cryostat *operatorv1beta1.Cryostat) ([]byte, error) {
caName := cryostat.Name + "-ca"
secret, err := r.GetCertificateSecret(ctx, caName, cryostat.Namespace)
if err != nil {
return nil, err
}
return secret.Data[corev1.TLSCertKey], nil
}
func isCertificateReady(cert *certv1.Certificate) bool {
// Check if the certificate has a condition where Ready == True
for _, condition := range cert.Status.Conditions {
if condition.Type == certv1.CertificateConditionReady && condition.Status == certMeta.ConditionTrue {
return true
}
}
return false
}