net_ssl.h

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// Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
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// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of the Andrey N. Sabelnikov nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
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// 



#ifndef _NET_SSL_H
#define _NET_SSL_H

#include <chrono>
#include <stdint.h>
#include <string>
#include <vector>
#include <boost/utility/string_ref.hpp>
#include <boost/asio/io_context.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <boost/asio/ssl.hpp>
#include <boost/filesystem/path.hpp>
#include <boost/system/error_code.hpp>

#define SSL_FINGERPRINT_SIZE 32

namespace epee
{
namespace net_utils
{
    enum class ssl_support_t: uint8_t {
        e_ssl_support_disabled,
        e_ssl_support_enabled,
        e_ssl_support_autodetect,
    };

  enum class ssl_verification_t : uint8_t
  {
    none = 0,         
    system_ca,        
    user_certificates,
    user_ca           
  };

  struct ssl_authentication_t
  {
    std::string private_key_path; 
    std::string certificate_path; 

    void use_ssl_certificate(boost::asio::ssl::context &ssl_context) const;
  };

  class ssl_options_t
  {
    // force sorted behavior in private
    std::vector<std::vector<std::uint8_t>> fingerprints_;

  public:
    std::string ca_path;
    ssl_authentication_t auth;
    ssl_support_t support;
    ssl_verification_t verification;

    ssl_options_t(ssl_support_t support)
      : fingerprints_(),
        ca_path(),
        auth(),
        support(support),
        verification(support == ssl_support_t::e_ssl_support_disabled ? ssl_verification_t::none : ssl_verification_t::system_ca)
    {}

    ssl_options_t(std::vector<std::vector<std::uint8_t>> fingerprints, std::string ca_path);

    ssl_options_t(const ssl_options_t&) = default;
    ssl_options_t(ssl_options_t&&) = default;

    ssl_options_t& operator=(const ssl_options_t&) = default;
    ssl_options_t& operator=(ssl_options_t&&) = default;

    explicit operator bool() const noexcept { return support != ssl_support_t::e_ssl_support_disabled; }

    bool has_strong_verification(boost::string_ref host) const noexcept;

    bool has_fingerprint(boost::asio::ssl::verify_context &ctx) const;

    void configure(
      boost::asio::ssl::stream<boost::asio::ip::tcp::socket> &socket,
      boost::asio::ssl::stream_base::handshake_type type,
      const std::string& host = {}) const;
    boost::asio::ssl::context create_context() const;

    bool handshake(
      boost::asio::io_context& io_context,
      boost::asio::ssl::stream<boost::asio::ip::tcp::socket> &socket,
      boost::asio::ssl::stream_base::handshake_type type,
      boost::asio::const_buffer buffer = {},
      const std::string& host = {},
      std::chrono::milliseconds timeout = std::chrono::seconds(15)) const;
  };

        // https://security.stackexchange.com/questions/34780/checking-client-hello-for-https-classification
    constexpr size_t get_ssl_magic_size() { return 9; }
    bool is_ssl(const unsigned char *data, size_t len);
    bool ssl_support_from_string(ssl_support_t &ssl, boost::string_ref s);

    bool create_ec_ssl_certificate(EVP_PKEY *&pkey, X509 *&cert);
    bool create_rsa_ssl_certificate(EVP_PKEY *&pkey, X509 *&cert);

  boost::system::error_code store_ssl_keys(boost::asio::ssl::context& ssl, const boost::filesystem::path& base);
}
}

#endif //_NET_SSL_H