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