lego/acme/tls_sni_challenge.go

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package acme
import (
"crypto/rsa"
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"crypto/sha256"
"crypto/tls"
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"encoding/hex"
"encoding/json"
"errors"
"fmt"
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"net"
"net/http"
"time"
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)
type tlsSNIChallenge struct {
jws *jws
optPort string
start chan net.Listener
end chan error
}
func (t *tlsSNIChallenge) Solve(chlng challenge, domain string) error {
// FIXME: https://github.com/ietf-wg-acme/acme/pull/22
// 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)
t.end = make(chan error)
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// Generate the Key Authorization for the challenge
keyAuth, err := getKeyAuthorization(chlng.Token, &t.jws.privKey.PublicKey)
if err != nil {
return err
}
certificate, err := t.generateCertificate(keyAuth)
if err != nil {
return err
}
go t.startSNITLSServer(certificate)
var listener net.Listener
select {
case listener = <-t.start:
break
case err := <-t.end:
return fmt.Errorf("Could not start HTTPS server for challenge -> %v", err)
}
// Make sure we properly close the HTTP server before we return
defer func() {
listener.Close()
err = <-t.end
close(t.start)
close(t.end)
}()
jsonBytes, err := json.Marshal(challenge{Resource: "challenge", Type: chlng.Type, Token: chlng.Token, KeyAuthorization: keyAuth})
if err != nil {
return errors.New("Failed to marshal network message...")
}
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// Tell the server we handle TLS-SNI-01
resp, err := t.jws.post(chlng.URI, jsonBytes)
if err != nil {
return fmt.Errorf("Failed to post JWS message. -> %v", err)
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}
// After the path is sent, the ACME server will access our server.
// Repeatedly check the server for an updated status on our request.
var challengeResponse challenge
Loop:
for {
if resp.StatusCode >= http.StatusBadRequest {
return handleHTTPError(resp)
}
err = json.NewDecoder(resp.Body).Decode(&challengeResponse)
resp.Body.Close()
if err != nil {
return err
}
switch challengeResponse.Status {
case "valid":
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logf("[INFO][%s] The server validated our request", domain)
break Loop
case "pending":
break
case "invalid":
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return handleChallengeError(challengeResponse)
default:
return errors.New("The server returned an unexpected state.")
}
time.Sleep(1 * time.Second)
resp, err = http.Get(chlng.URI)
}
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return nil
}
func (t *tlsSNIChallenge) generateCertificate(keyAuth string) (tls.Certificate, error) {
zBytes := sha256.Sum256([]byte(keyAuth))
z := hex.EncodeToString(zBytes[:sha256.Size])
// generate a new RSA key for the certificates
tempPrivKey, err := generatePrivateKey(rsakey, 2048)
if err != nil {
return tls.Certificate{}, err
}
rsaPrivKey := tempPrivKey.(*rsa.PrivateKey)
rsaPrivPEM := pemEncode(rsaPrivKey)
domain := fmt.Sprintf("%s.%s.acme.invalid", z[:32], z[32:])
tempCertPEM, err := generatePemCert(rsaPrivKey, domain)
if err != nil {
return tls.Certificate{}, err
}
certificate, err := tls.X509KeyPair(tempCertPEM, rsaPrivPEM)
if err != nil {
return tls.Certificate{}, err
}
return certificate, nil
}
func (t *tlsSNIChallenge) startSNITLSServer(cert tls.Certificate) {
// Allow for CLI port override
port := ":443"
if t.optPort != "" {
port = ":" + t.optPort
}
tlsConf := new(tls.Config)
tlsConf.Certificates = []tls.Certificate{cert}
tlsListener, err := tls.Listen("tcp", port, tlsConf)
if err != nil {
t.end <- err
}
// Signal successfull start
t.start <- tlsListener
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http.Serve(tlsListener, nil)
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t.end <- nil
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}