如何验证中间 CA

我有与服务器的SSL连接。我有根 CA，它也是服务器证书。我没有客户端证书，当连接启动时，客户端会验证服务器证书，如果它有效，则连接。现在我已经从我的根 CA 创建了中间 CA，并将其替换为服务器证书，现在我希望客户端验证服务器证书是否受根 CA 信任，我使用 openSSL API C++执行此操作。我该怎么做？这是我尝试过的，但它需要更多的东西。

  const Char *caCert = "/home/omar/CA/host/host_rsa_key.crt";
      X509_LOOKUP *lookup = X509_STORE_add_lookup(ctx_ ->  cert_store,X509_LOOKUP_file());

      result=X509_LOOKUP_load_file(lookup,caCert,X509_FILETYPE_PEM);
      if(result != 1)
      {
        log()<<ERROR! Cannot load file to lookup structuren";
        return;
      }

      SSL_CTX_sess_set_new_cb(ctx_, handshakeCallback);
      SSL_CTX_set_verify(ctx_, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
                         verifyCallback);
      SSL_CTX_set_verify_depth(ctx_, 8);

这是我将所有证书加载到ssl_ctx的地方。

我有验证回调函数，它调用验证证书（）方法，这里是

  Int verifyCertificate(Int preverify, X509_STORE_CTX *store)
  {
  X509 *cert = NULL;
 // X509_NAME *name = NULL;
  SSL *ssl = NULL;
 Int certDepth = -1;
 Int certErr   = 0;
 Char *certHost = NULL;
 Char *certHash = NULL;
 Char *certData = NULL;

 cert = X509_STORE_CTX_get_current_cert(store);
 if (cert == NULL)
 log() << " ERROR! Failed to get certificate.n";

goto VerifyCertificateError;
}

 certDepth = X509_STORE_CTX_get_error_depth(store);
 certErr = X509_STORE_CTX_get_error(store);

ssl = (SSL *) X509_STORE_CTX_get_ex_data(store, SSL_get_ex_data_X509_STORE_CTX_idx());
if (ssl == NULL)
{
 log() <<  ERROR! Failed to get SSL context from store context.n";
 goto VerifyCertificateError;
}
if (preverify == 0)
{
//
// Self signed certificate allowed, SSH host auth style.
//
if (certErr == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT)
{
  log() << " Certificate preverify failed on self";
  return 1;
}
else if (certErr == X509_V_ERR_CERT_NOT_YET_VALID)
{
  log() << Allowing not yet valid certificate.n";
  return 1;
 }
 else if (certErr == X509_V_ERR_CERT_HAS_EXPIRED)
 {
  log() << " Allowing expired certificate.n";

  return 1;
}
else if(certErr == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT)
{
  log()<<" Unable to get issuer cert.n"

  return 1;
}

if (certDepth == 0)
{
 if (parseCertificate(store, certHost, certHash, certData) == 0)
 {
   log() << "Encryptable: ERROR! Failed to parse certificate.n";
  goto VerifyCertificateError;
}

  goto VerifyCertificateError;
}

if (authCallback_(certHost, certHash, certData, certCallback_,
                      callbackParameter_) == 0)
 {
  log() << " ERROR! Failed to authorize "
        << "the server certificate.n";
  goto VerifyCertificateError;

if (certData != NULL)
{
  delete [] certData;
}
return 0;
}