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Filename : host_name_verification.ipp
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//
// ssl/impl/host_name_verification.ipp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//

#ifndef BOOST_ASIO_SSL_IMPL_HOST_NAME_VERIFICATION_IPP
#define BOOST_ASIO_SSL_IMPL_HOST_NAME_VERIFICATION_IPP

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)

#include <boost/asio/detail/config.hpp>

#include <cctype>
#include <cstring>
#include <boost/asio/ip/address.hpp>
#include <boost/asio/ssl/host_name_verification.hpp>
#include <boost/asio/ssl/detail/openssl_types.hpp>

#include <boost/asio/detail/push_options.hpp>

namespace boost {
namespace asio {
namespace ssl {

bool host_name_verification::operator()(
    bool preverified, verify_context& ctx) const
{
  using namespace std; // For memcmp.

  // Don't bother looking at certificates that have failed pre-verification.
  if (!preverified)
    return false;

  // We're only interested in checking the certificate at the end of the chain.
  int depth = X509_STORE_CTX_get_error_depth(ctx.native_handle());
  if (depth > 0)
    return true;

  // Try converting the host name to an address. If it is an address then we
  // need to look for an IP address in the certificate rather than a host name.
  boost::system::error_code ec;
  ip::address address = ip::make_address(host_, ec);
  const bool is_address = !ec;
  (void)address;

  X509* cert = X509_STORE_CTX_get_current_cert(ctx.native_handle());

  if (is_address)
  {
    return X509_check_ip_asc(cert, host_.c_str(), 0) == 1;
  }
  else
  {
    char* peername = 0;
    const int result = X509_check_host(cert,
        host_.c_str(), host_.size(), 0, &peername);
    OPENSSL_free(peername);
    return result == 1;
  }
}

} // namespace ssl
} // namespace asio
} // namespace boost

#include <boost/asio/detail/pop_options.hpp>

#endif // BOOST_ASIO_SSL_IMPL_HOST_NAME_VERIFICATION_IPP