153 lines
3.5 KiB
Go
153 lines
3.5 KiB
Go
package acme
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import (
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"crypto/rsa"
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"crypto/sha256"
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"crypto/tls"
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"encoding/hex"
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"encoding/json"
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"errors"
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"fmt"
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"net"
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"net/http"
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"time"
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)
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type tlsSNIChallenge struct {
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jws *jws
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optPort string
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start chan net.Listener
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end chan error
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}
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func (t *tlsSNIChallenge) Solve(chlng challenge, domain string) error {
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// FIXME: https://github.com/ietf-wg-acme/acme/pull/22
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// Currently we implement this challenge to track boulder, not the current spec!
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logf("[INFO][%s] acme: Trying to solve TLS-SNI-01", domain)
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t.start = make(chan net.Listener)
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t.end = make(chan error)
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// Generate the Key Authorization for the challenge
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keyAuth, err := getKeyAuthorization(chlng.Token, &t.jws.privKey.PublicKey)
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if err != nil {
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return err
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}
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certificate, err := t.generateCertificate(keyAuth)
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if err != nil {
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return err
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}
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go t.startSNITLSServer(certificate)
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var listener net.Listener
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select {
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case listener = <-t.start:
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break
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case err := <-t.end:
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return fmt.Errorf("Could not start HTTPS server for challenge -> %v", err)
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}
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// Make sure we properly close the HTTP server before we return
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defer func() {
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listener.Close()
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err = <-t.end
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close(t.start)
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close(t.end)
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}()
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jsonBytes, err := json.Marshal(challenge{Resource: "challenge", Type: chlng.Type, Token: chlng.Token, KeyAuthorization: keyAuth})
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if err != nil {
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return errors.New("Failed to marshal network message...")
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}
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// Tell the server we handle TLS-SNI-01
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resp, err := t.jws.post(chlng.URI, jsonBytes)
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if err != nil {
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return fmt.Errorf("Failed to post JWS message. -> %v", err)
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}
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// After the path is sent, the ACME server will access our server.
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// Repeatedly check the server for an updated status on our request.
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var challengeResponse challenge
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Loop:
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for {
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if resp.StatusCode >= http.StatusBadRequest {
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return handleHTTPError(resp)
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}
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err = json.NewDecoder(resp.Body).Decode(&challengeResponse)
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resp.Body.Close()
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if err != nil {
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return err
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}
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switch challengeResponse.Status {
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case "valid":
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logf("[INFO][%s] The server validated our request", domain)
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break Loop
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case "pending":
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break
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case "invalid":
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return handleChallengeError(challengeResponse)
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default:
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return errors.New("The server returned an unexpected state.")
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}
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time.Sleep(1 * time.Second)
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resp, err = http.Get(chlng.URI)
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}
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return nil
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}
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func (t *tlsSNIChallenge) generateCertificate(keyAuth string) (tls.Certificate, error) {
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zBytes := sha256.Sum256([]byte(keyAuth))
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z := hex.EncodeToString(zBytes[:sha256.Size])
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// generate a new RSA key for the certificates
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tempPrivKey, err := generatePrivateKey(rsakey, 2048)
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if err != nil {
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return tls.Certificate{}, err
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}
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rsaPrivKey := tempPrivKey.(*rsa.PrivateKey)
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rsaPrivPEM := pemEncode(rsaPrivKey)
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domain := fmt.Sprintf("%s.%s.acme.invalid", z[:32], z[32:])
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tempCertPEM, err := generatePemCert(rsaPrivKey, domain)
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if err != nil {
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return tls.Certificate{}, 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 tls.Certificate{}, err
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}
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return certificate, nil
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}
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func (t *tlsSNIChallenge) startSNITLSServer(cert tls.Certificate) {
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// Allow for CLI port override
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port := ":443"
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if t.optPort != "" {
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port = ":" + t.optPort
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}
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tlsConf := new(tls.Config)
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tlsConf.Certificates = []tls.Certificate{cert}
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tlsListener, err := tls.Listen("tcp", port, tlsConf)
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if err != nil {
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t.end <- err
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}
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// Signal successfull start
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t.start <- tlsListener
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http.Serve(tlsListener, nil)
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t.end <- nil
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}
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