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Return TLS unrecognized_name error when no certificate is available

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Romain 2022-03-28 18:18:08 +02:00 committed by GitHub
parent e3adf93a74
commit 0f29e893f4
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 15 additions and 2 deletions
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17
pkg/tls/tlsmanager.go
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@ -143,7 +143,18 @@ func (m *Manager) Get(storeName, configName string) (*tls.Config, error) {
if isACMETLS(clientHello) {
certificate := acmeTLSStore.GetBestCertificate(clientHello)
if certificate == nil {
return nil, fmt.Errorf("no certificate for TLSALPN challenge: %s", domainToCheck)
log.WithoutContext().Debugf("TLS: no certificate for TLSALPN challenge: %s", domainToCheck)
// We want the user to eventually get the (alertUnrecognizedName) "unrecognized
// name" error.
// Unfortunately, if we returned an error here, since we can't use
// the unexported error (errNoCertificates) that our caller (config.getCertificate
// in crypto/tls) uses as a sentinel, it would report an (alertInternalError)
// "internal error" instead of an alertUnrecognizedName.
// Which is why we return no error, and we let the caller detect that there's
// actually no certificate, and fall back into the flow that will report
// the desired error.
// https://cs.opensource.google/go/go/+/dev.boringcrypto.go1.17:src/crypto/tls/common.go;l=1058
return nil, nil
}
return certificate, nil
@ -155,7 +166,9 @@ func (m *Manager) Get(storeName, configName string) (*tls.Config, error) {
}
if sniStrict {
return nil, fmt.Errorf("strict SNI enabled - No certificate found for domain: %q, closing connection", domainToCheck)
log.WithoutContext().Debugf("TLS: strict SNI enabled - No certificate found for domain: %q, closing connection", domainToCheck)
// Same comment as above, as in the isACMETLS case.
return nil, nil
}
log.WithoutContext().Debugf("Serving default certificate for request: %q", domainToCheck)