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Merge pull request #47 from s-urbaniak/tls-reload-tick
*: watch tls certificate changes
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| /* | ||
| Copyright 2017 Frederic Branczyk All rights reserved. | ||
| 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 tls | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "crypto/tls" | ||
| "fmt" | ||
| "io/ioutil" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/golang/glog" | ||
| ) | ||
|
|
||
| // CertReloader is the struct that parses a certificate/key pair, | ||
| // providing a goroutine safe GetCertificate method to retrieve the parsed content. | ||
| // | ||
| // The GetCertificate signature is compatible with https://golang.org/pkg/crypto/tls/#Config.GetCertificate | ||
| // and can be used to hot-reload a certificate/key pair. | ||
| // | ||
| // For hot-reloading the Watch method must be started explicitly. | ||
| type CertReloader struct { | ||
| certPath, keyPath string | ||
| interval time.Duration | ||
|
|
||
| mu sync.RWMutex // protects the fields below | ||
| cert *tls.Certificate | ||
| certRaw, keyRaw []byte | ||
| } | ||
|
|
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| func NewCertReloader(certPath, keyPath string, interval time.Duration) (*CertReloader, error) { | ||
| r := &CertReloader{ | ||
| certPath: certPath, | ||
| keyPath: keyPath, | ||
| interval: interval, | ||
| } | ||
|
|
||
| if err := r.reload(); err != nil { | ||
| return nil, fmt.Errorf("error loading certificates: %v", err) | ||
| } | ||
|
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| return r, nil | ||
| } | ||
|
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| // Watch watches the configured certificate and key path and blocks the current goroutine | ||
| // until the scenario context is done or an error occurred during reloading. | ||
| func (r *CertReloader) Watch(ctx context.Context) error { | ||
| t := time.NewTicker(r.interval) | ||
|
|
||
| for { | ||
| select { | ||
| case <-t.C: | ||
| case <-ctx.Done(): | ||
| return nil | ||
| } | ||
|
|
||
| if err := r.reload(); err != nil { | ||
| return fmt.Errorf("reloading failed: %v", err) | ||
| } | ||
| } | ||
| } | ||
|
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| func (r *CertReloader) reload() error { | ||
| certRaw, err := ioutil.ReadFile(r.certPath) | ||
| if err != nil { | ||
| return fmt.Errorf("error loading certificate: %v", err) | ||
| } | ||
|
|
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| keyRaw, err := ioutil.ReadFile(r.keyPath) | ||
| if err != nil { | ||
| return fmt.Errorf("error loading key: %v", err) | ||
| } | ||
|
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| r.mu.RLock() | ||
| equal := bytes.Equal(keyRaw, r.keyRaw) && bytes.Equal(certRaw, r.certRaw) | ||
| r.mu.RUnlock() | ||
|
|
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| if equal { | ||
| return nil | ||
| } | ||
|
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| glog.V(4).Info("reloading key ", r.keyPath, " certificate ", r.certPath) | ||
|
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| cert, err := tls.X509KeyPair(certRaw, keyRaw) | ||
| if err != nil { | ||
| return fmt.Errorf("error parsing certificate: %v", err) | ||
| } | ||
|
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| r.mu.Lock() | ||
| r.cert = &cert | ||
| r.certRaw = certRaw | ||
| r.keyRaw = keyRaw | ||
| r.mu.Unlock() | ||
|
|
||
| return nil | ||
| } | ||
|
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| // GetCertificate returns the current valid certificate. | ||
| // The ClientHello message is ignored | ||
| // and is just there to be compatible with https://golang.org/pkg/crypto/tls/#Config.GetCertificate. | ||
| func (r *CertReloader) GetCertificate(_ *tls.ClientHelloInfo) (*tls.Certificate, error) { | ||
| r.mu.RLock() | ||
| defer r.mu.RUnlock() | ||
|
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||
| return r.cert, nil | ||
| } |
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