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dnscontrollerprovider.go
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dnscontrollerprovider.go
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/*
* Copyright 2019 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
*
*/
package legobridge
import (
"fmt"
"github.com/gardener/cert-management/pkg/cert/metrics"
"github.com/gardener/cert-management/pkg/cert/source"
"github.com/gardener/cert-management/pkg/cert/utils"
"k8s.io/apimachinery/pkg/util/wait"
"sync/atomic"
"time"
"github.com/go-acme/lego/v3/challenge"
"github.com/go-acme/lego/v3/challenge/dns01"
"github.com/gardener/controller-manager-library/pkg/logger"
"github.com/gardener/controller-manager-library/pkg/resources"
dnsapi "github.com/gardener/external-dns-management/pkg/apis/dns/v1alpha1"
"github.com/gardener/external-dns-management/pkg/dns"
)
// ProviderWithCount is an extended Provider interface.
type ProviderWithCount interface {
challenge.Provider
GetChallengesCount() int
}
var index uint32
func newDNSControllerProvider(cluster resources.Cluster, settings DNSControllerSettings,
certificateName resources.ObjectName, targetClass, issuerName string) (ProviderWithCount, error) {
itf, err := cluster.Resources().GetByExample(&dnsapi.DNSEntry{})
if err != nil {
return nil, fmt.Errorf("cannot get DNSEntry resources: %s", err.Error())
}
n := atomic.AddUint32(&index, 1)
return &dnsControllerProvider{
logger: logger.NewContext("DNSChallengeProvider", fmt.Sprintf("dns-challenge-provider: %s-%d", certificateName, n)),
settings: settings,
entryResources: itf,
certificateName: certificateName,
targetClass: targetClass,
issuerName: issuerName,
ttl: int64(settings.PropagationTimeout.Seconds()),
initialWait: true,
presenting: map[string][]string{}}, nil
}
type dnsControllerProvider struct {
logger logger.LogContext
settings DNSControllerSettings
entryResources resources.Interface
certificateName resources.ObjectName
targetClass string
issuerName string
count int32
ttl int64
presenting map[string][]string
multiValues bool
initialWait bool
}
var _ challenge.Provider = &dnsControllerProvider{}
var _ challenge.ProviderTimeout = &dnsControllerProvider{}
var backoff = wait.Backoff{
Steps: 4,
Duration: 500 * time.Millisecond,
Factor: 2.0,
Jitter: 0.1,
Cap: 2500 * time.Millisecond,
}
type updateError struct {
msg string
}
func (e *updateError) Error() string {
return e.msg
}
func retryOnUpdateError(fn func() error) error {
var lastUpdateErr error
err := wait.ExponentialBackoff(backoff, func() (bool, error) {
err := fn()
_, isUpdateErr := err.(*updateError)
switch {
case err == nil:
return true, nil
case isUpdateErr:
lastUpdateErr = err
return false, nil
default:
return false, err
}
})
if err == wait.ErrWaitTimeout {
err = lastUpdateErr
}
return err
}
func (p *dnsControllerProvider) Present(domain, token, keyAuth string) error {
metrics.AddActiveACMEDNSChallenge(p.issuerName)
atomic.AddInt32(&p.count, 1)
fqdn, value := dns01.GetRecord(domain, keyAuth)
values := p.addPresentingDomainValue(domain, value)
setSpec := func(e *dnsapi.DNSEntry) {
e.Spec.DNSName = dns.NormalizeHostname(fqdn)
e.Spec.OwnerId = p.settings.OwnerID
e.Spec.TTL = &p.ttl
e.Spec.Text = values
if p.targetClass != "" {
resources.SetAnnotation(e, source.AnnotDNSClass, p.targetClass)
}
}
entry := p.prepareEntry(domain)
if len(values) == 1 {
setSpec(entry)
p.logger.Infof("presenting DNSEntry %s/%s for certificate resource %s", entry.Namespace, entry.Name, p.certificateName)
if p.existsBlockingEntry(entry) {
p.removePresentingDomain(domain)
return fmt.Errorf("already existing DNSEntry %s/%s for certificate resource %s", entry.Namespace, entry.Name, p.certificateName)
}
_, err := p.entryResources.Create(entry)
if err != nil {
return fmt.Errorf("creating DNSEntry %s/%s failed with %s", entry.Namespace, entry.Name, err.Error())
}
return nil
}
p.multiValues = true
err := retryOnUpdateError(func() error {
obj, err := p.entryResources.Get_(entry)
if err != nil {
return fmt.Errorf("getting DNSEntry %s/%s failed with %s", entry.Namespace, entry.Name, err.Error())
}
entry = obj.Data().(*dnsapi.DNSEntry)
setSpec(entry)
p.logger.Infof("presenting DNSEntry %s/%s for certificate resource %s with %d values", entry.Namespace, entry.Name, p.certificateName, len(values))
_, err = p.entryResources.Update(entry)
if err != nil {
return &updateError{msg: fmt.Sprintf("updating DNSEntry %s/%s failed with %s", entry.Namespace, entry.Name, err.Error())}
}
return nil
})
return err
}
func (p *dnsControllerProvider) existsBlockingEntry(entry *dnsapi.DNSEntry) bool {
objectName := resources.NewObjectName(entry.Namespace, entry.Name)
obj, err := p.entryResources.Get_(objectName)
if err != nil {
return false
}
keep := obj.GetCreationTimestamp().Add(3 * time.Minute).After(time.Now())
if !keep {
// delete outdated or foreign DNSEntry
_ = p.entryResources.DeleteByName(objectName)
}
return keep
}
func (p *dnsControllerProvider) addPresentingDomainValue(domain, value string) []string {
values := append(p.presenting[domain], value)
p.presenting[domain] = values
return values
}
func (p *dnsControllerProvider) removePresentingDomain(domain string) bool {
if _, found := p.presenting[domain]; !found {
return false
}
delete(p.presenting, domain)
return true
}
func (p *dnsControllerProvider) CleanUp(domain, token, keyAuth string) error {
metrics.RemoveActiveACMEDNSChallenge(p.issuerName)
if !p.removePresentingDomain(domain) {
return nil
}
entry := p.prepareEntry(domain)
p.logger.Infof("cleanup DNSEntry %s/%s for request %s", entry.Namespace, entry.Name, p.certificateName)
err := p.entryResources.Delete(entry)
if err != nil {
return fmt.Errorf("deleting DNSEntry %s/%s failed with %s", entry.Namespace, entry.Name, err.Error())
}
return nil
}
func (p *dnsControllerProvider) GetChallengesCount() int {
return int(atomic.LoadInt32(&p.count))
}
func (p *dnsControllerProvider) prepareEntry(domain string) *dnsapi.DNSEntry {
entry := &dnsapi.DNSEntry{}
entry.Name = "cert--" + domain
entry.Namespace = p.settings.Namespace
return entry
}
func (p *dnsControllerProvider) checkDNSEntryNotPending(domain string, values []string) bool {
entry := p.prepareEntry(domain)
obj, err := p.entryResources.Get_(entry)
if err != nil {
return true // no more waiting
}
entry = obj.Data().(*dnsapi.DNSEntry)
return !(entry.Status.State == "Pending" || entry.Status.State == "Ready" && len(entry.Status.Targets) != len(values))
}
func (p *dnsControllerProvider) Timeout() (timeout, interval time.Duration) {
waitTimeout := p.settings.PropagationTimeout
if p.initialWait {
p.initialWait = false
// The Timeout function is called several times after all domains are "presented".
// On the first call it is checked that no DNS entries are pending anymore.
// Depending on number of domain names and possible parallel other work,
// the dns-controller-manager may need several change batches
// until all entries are ready
prepareWaitTimeout := waitTimeout + 5*time.Second*time.Duration(len(p.presenting))
p.waitFor("DNS entry getting ready", p.checkDNSEntryNotPending, prepareWaitTimeout)
if p.waitFor("DNS record propagation", p.isDNSTxtRecordReady, waitTimeout) {
// wait some additional seconds to enlarge probability of record propagation to DNS server use by ACME server
additionalWaitTime := p.settings.AdditionalWait
p.logger.Infof("Waiting additional %d seconds...", int(additionalWaitTime.Seconds()))
time.Sleep(additionalWaitTime)
}
}
return waitTimeout / 2, dns01.DefaultPollingInterval
}
func (p *dnsControllerProvider) waitFor(msg string, isReady func(domain string, values []string) bool, timeout time.Duration) bool {
waitTime := 5 * time.Second
endTime := time.Now().Add(timeout)
pendingDomain := ""
for time.Now().Before(endTime) {
ready := true
for domain, values := range p.presenting {
if !isReady(domain, values) {
pendingDomain = domain
ready = false
break
}
}
if ready {
return true
}
p.logger.Infof("Waiting %d seconds for %s [%s]...", int(waitTime.Seconds()), msg, pendingDomain)
time.Sleep(waitTime)
}
return false
}
func (p *dnsControllerProvider) isDNSTxtRecordReady(domain string, values []string) bool {
fqdn := fmt.Sprintf("_acme-challenge.%s.", domain)
found, _ := utils.CheckDNSPropagation(p.settings.PrecheckNameservers, fqdn, values...)
return found
}