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challengeProvider.go
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challengeProvider.go
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package acme
import (
"crypto"
"crypto/ecdsa"
"crypto/rand"
"crypto/rsa"
"crypto/sha256"
"crypto/tls"
"crypto/x509"
"encoding/hex"
"encoding/pem"
"fmt"
"strings"
"sync"
"time"
"github.com/cenk/backoff"
"github.com/containous/traefik/cluster"
"github.com/containous/traefik/log"
"github.com/containous/traefik/safe"
"github.com/containous/traefik/tls/generate"
"github.com/xenolf/lego/acme"
)
var _ acme.ChallengeProviderTimeout = (*challengeProvider)(nil)
type challengeProvider struct {
store cluster.Store
lock sync.RWMutex
}
func (c *challengeProvider) getCertificate(domain string) (cert *tls.Certificate, exists bool) {
log.Debugf("Challenge GetCertificate %s", domain)
if !strings.HasSuffix(domain, ".acme.invalid") {
return nil, false
}
c.lock.RLock()
defer c.lock.RUnlock()
account := c.store.Get().(*Account)
if account.ChallengeCerts == nil {
return nil, false
}
account.Init()
var result *tls.Certificate
operation := func() error {
for _, cert := range account.ChallengeCerts {
for _, dns := range cert.certificate.Leaf.DNSNames {
if domain == dns {
result = cert.certificate
return nil
}
}
}
return fmt.Errorf("cannot find challenge cert for domain %s", domain)
}
notify := func(err error, time time.Duration) {
log.Errorf("Error getting cert: %v, retrying in %s", err, time)
}
ebo := backoff.NewExponentialBackOff()
ebo.MaxElapsedTime = 60 * time.Second
err := backoff.RetryNotify(safe.OperationWithRecover(operation), ebo, notify)
if err != nil {
log.Errorf("Error getting cert: %v", err)
return nil, false
}
return result, true
}
func (c *challengeProvider) Present(domain, token, keyAuth string) error {
log.Debugf("Challenge Present %s", domain)
cert, _, err := tlsSNI01ChallengeCert(keyAuth)
if err != nil {
return err
}
c.lock.Lock()
defer c.lock.Unlock()
transaction, object, err := c.store.Begin()
if err != nil {
return err
}
account := object.(*Account)
if account.ChallengeCerts == nil {
account.ChallengeCerts = map[string]*ChallengeCert{}
}
account.ChallengeCerts[domain] = &cert
return transaction.Commit(account)
}
func (c *challengeProvider) CleanUp(domain, token, keyAuth string) error {
log.Debugf("Challenge CleanUp %s", domain)
c.lock.Lock()
defer c.lock.Unlock()
transaction, object, err := c.store.Begin()
if err != nil {
return err
}
account := object.(*Account)
delete(account.ChallengeCerts, domain)
return transaction.Commit(account)
}
func (c *challengeProvider) Timeout() (timeout, interval time.Duration) {
return 60 * time.Second, 5 * time.Second
}
// tlsSNI01ChallengeCert returns a certificate and target domain for the `tls-sni-01` challenge
func tlsSNI01ChallengeCert(keyAuth string) (ChallengeCert, string, error) {
// generate a new RSA key for the certificates
var tempPrivKey crypto.PrivateKey
tempPrivKey, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return ChallengeCert{}, "", err
}
rsaPrivKey := tempPrivKey.(*rsa.PrivateKey)
rsaPrivPEM := pemEncode(rsaPrivKey)
zBytes := sha256.Sum256([]byte(keyAuth))
z := hex.EncodeToString(zBytes[:sha256.Size])
domain := fmt.Sprintf("%s.%s.acme.invalid", z[:32], z[32:])
tempCertPEM, err := generate.PemCert(rsaPrivKey, domain, time.Time{})
if err != nil {
return ChallengeCert{}, "", err
}
certificate, err := tls.X509KeyPair(tempCertPEM, rsaPrivPEM)
if err != nil {
return ChallengeCert{}, "", err
}
return ChallengeCert{Certificate: tempCertPEM, PrivateKey: rsaPrivPEM, certificate: &certificate}, domain, nil
}
func pemEncode(data interface{}) []byte {
var pemBlock *pem.Block
switch key := data.(type) {
case *ecdsa.PrivateKey:
keyBytes, _ := x509.MarshalECPrivateKey(key)
pemBlock = &pem.Block{Type: "EC PRIVATE KEY", Bytes: keyBytes}
case *rsa.PrivateKey:
pemBlock = &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(key)}
case *x509.CertificateRequest:
pemBlock = &pem.Block{Type: "CERTIFICATE REQUEST", Bytes: key.Raw}
case []byte:
pemBlock = &pem.Block{Type: "CERTIFICATE", Bytes: []byte(data.([]byte))}
}
return pem.EncodeToMemory(pemBlock)
}