expose the ConnectionState in the Session

The ConnectionState contains basic details about the QUIC connection.

internal/crypto/cert_manager.go

@@ -18,6 +18,7 @@ type CertManager interface {
 	GetLeafCertHash() (uint64, error)
 	VerifyServerProof(proof, chlo, serverConfigData []byte) bool
 	Verify(hostname string) error
+	GetChain() []*x509.Certificate
 }
 
 type certManager struct {
@@ -54,6 +55,10 @@ func (c *certManager) SetData(data []byte) error {
 	return nil
 }
 
+func (c *certManager) GetChain() []*x509.Certificate {
+	return c.chain
+}
+
 func (c *certManager) GetCommonCertificateHashes() []byte {
 	return getCommonCertificateHashes()
 }