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keycertbundlerotator.go
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keycertbundlerotator.go
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// Copyright 2018 Istio Authors
//
// 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
// limitations under the License.
package caclient
import (
"fmt"
"sync"
"time"
"istio.io/istio/pkg/log"
pkiutil "istio.io/istio/security/pkg/pki/util"
"istio.io/istio/security/pkg/util"
)
// NewKeyCertBundleRotator is constructor for keyCertBundleRotatorImpl based on the provided configuration.
func NewKeyCertBundleRotator(cfg *Config, retriever KeyCertRetriever, bundle pkiutil.KeyCertBundle) (*KeyCertBundleRotator, error) {
if cfg == nil {
return nil, fmt.Errorf("nil configuration passed")
}
return &KeyCertBundleRotator{
certUtil: util.NewCertUtil(cfg.CSRGracePeriodPercentage),
retriever: retriever,
keycert: bundle,
stopCh: make(chan bool, 1),
stopped: true,
}, nil
}
// KeyCertRetriever is the interface responsible for retrieve new key and certificate from upstream CA.
type KeyCertRetriever interface {
Retrieve(opt *pkiutil.CertOptions) (newCert, certChain, privateKey []byte, err error)
}
// KeyCertBundleRotator automatically updates the key and cert bundle by interacting with upstream CA.
type KeyCertBundleRotator struct {
// TODO: Support multiple KeyCertBundles.
certUtil util.CertUtil
keycert pkiutil.KeyCertBundle
stopCh chan bool
stopped bool
retriever KeyCertRetriever
stoppedMutex sync.Mutex
}
// Start periodically rotates the KeyCertBundle by interacting with the upstream CA.
// It is a blocking function that should run as a go routine. Thread safe.
func (c *KeyCertBundleRotator) Start(errCh chan<- error) {
c.stoppedMutex.Lock()
if !c.stopped {
errCh <- fmt.Errorf("rotator already started")
c.stoppedMutex.Unlock()
return
}
c.stopped = false
c.stoppedMutex.Unlock()
// Make sure we mark rotator stopped after this method finishes.
defer func() {
c.stoppedMutex.Lock()
c.stopped = true
c.stoppedMutex.Unlock()
}()
for {
certBytes, _, _, _ := c.keycert.GetAllPem()
if len(certBytes) != 0 {
waitTime, ttlErr := c.certUtil.GetWaitTime(certBytes, time.Now())
if ttlErr != nil {
log.Errorf("Error getting TTL from cert: %v. Rotate immediately.", ttlErr)
} else {
timer := time.NewTimer(waitTime)
log.Infof("Will rotate key and cert in %v.", waitTime)
select {
case <-c.stopCh:
return
case <-timer.C:
// Continue in the loop.
}
}
}
log.Infof("Retrieve new key and certs.")
co, coErr := c.keycert.CertOptions()
if coErr != nil {
err := fmt.Errorf("failed to extact CertOptions from bundle: %v, abort auto rotation", coErr)
log.Errora(err)
errCh <- err
return
}
certBytes, certChainBytes, privKeyBytes, rErr := c.retriever.Retrieve(co)
if rErr != nil {
err := fmt.Errorf("error retrieving the key and cert: %v, abort auto rotation", rErr)
log.Errora(err)
errCh <- err
return
}
_, _, _, rootCertBytes := c.keycert.GetAllPem()
if vErr := c.keycert.VerifyAndSetAll(certBytes, privKeyBytes, certChainBytes, rootCertBytes); vErr != nil {
err := fmt.Errorf("cannot verify the retrieved key and cert: %v, abort auto rotation", vErr)
log.Errora(err)
errCh <- err
return
}
log.Infof("Successfully retrieved new key and certs.")
}
}
// Stop stops the loop. Thread safe.
func (c *KeyCertBundleRotator) Stop() {
c.stoppedMutex.Lock()
if !c.stopped {
c.stopped = true
c.stopCh <- true
}
c.stoppedMutex.Unlock()
}