lego/acme/tls_sni_02_challenge.go
2016-06-29 16:51:28 +02:00

72 lines
2 KiB
Go

package acme
import (
"crypto/rsa"
"crypto/sha256"
"crypto/tls"
"encoding/hex"
"fmt"
"log"
)
type tlsSNI02Challenge struct {
jws *jws
validate validateFunc
provider ChallengeProvider
}
func (t *tlsSNI02Challenge) Solve(chlng challenge, domain string) error {
logf("[INFO][%s] acme: Trying to solve TLS-SNI-02", domain)
// Generate the Key Authorization for the challenge
keyAuth, err := getKeyAuthorization(chlng.Token, t.jws.privKey)
if err != nil {
return err
}
err = t.provider.Present(domain, chlng.Token, keyAuth)
if err != nil {
return fmt.Errorf("[%s] error presenting token: %v", domain, err)
}
defer func() {
err := t.provider.CleanUp(domain, chlng.Token, keyAuth)
if err != nil {
log.Printf("[%s] error cleaning up: %v", domain, err)
}
}()
return t.validate(t.jws, domain, chlng.URI, challenge{Resource: "challenge", Type: chlng.Type, Token: chlng.Token, KeyAuthorization: keyAuth})
}
// TLSSNI02ChallengeCert returns a certificate for the `tls-sni-02` challenge
func TLSSNI02ChallengeCert(token, keyAuth string) (tls.Certificate, error) {
// Construct SanA value from token sha256
tokenShaBytes := sha256.Sum256([]byte(token))
tokenSha := hex.EncodeToString(tokenShaBytes[:sha256.Size])
sanA := fmt.Sprintf("%s.%s.token.acme.invalid", tokenSha[:32], tokenSha[32:])
// Construct SanB value from keyAuth sha256
keyAuthShaBytes := sha256.Sum256([]byte(keyAuth))
keyAuthSha := hex.EncodeToString(keyAuthShaBytes[:sha256.Size])
sanB := fmt.Sprintf("%s.%s.ka.acme.invalid", keyAuthSha[:32], keyAuthSha[32:])
// generate a new RSA key for the certificate
tempPrivKey, err := generatePrivateKey(RSA2048)
if err != nil {
return tls.Certificate{}, err
}
rsaPrivKey := tempPrivKey.(*rsa.PrivateKey)
rsaPrivPEM := pemEncode(rsaPrivKey)
tempCertPEM, err := generatePemCert(rsaPrivKey, sanA, sanB)
if err != nil {
return tls.Certificate{}, err
}
certificate, err := tls.X509KeyPair(tempCertPEM, rsaPrivPEM)
if err != nil {
return tls.Certificate{}, err
}
return certificate, nil
}