ceph/src/boost/boost/asio/ssl/detail/engine.hpp

   1 //
   2 // ssl/detail/engine.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #ifndef BOOST_ASIO_SSL_DETAIL_ENGINE_HPP
  12 #define BOOST_ASIO_SSL_DETAIL_ENGINE_HPP
  13
  14 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  15 # pragma once
  16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  17
  18 #include <boost/asio/detail/config.hpp>
  19
  20 #include <boost/asio/buffer.hpp>
  21 #include <boost/asio/detail/static_mutex.hpp>
  22 #include <boost/asio/ssl/detail/openssl_types.hpp>
  23 #include <boost/asio/ssl/detail/verify_callback.hpp>
  24 #include <boost/asio/ssl/stream_base.hpp>
  25 #include <boost/asio/ssl/verify_mode.hpp>
  26
  27 #include <boost/asio/detail/push_options.hpp>
  28
  29 namespace boost {
  30 namespace asio {
  31 namespace ssl {
  32 namespace detail {
  33
  34 class engine
  35 {
  36 public:
  37   enum want
  38   {
  39     // Returned by functions to indicate that the engine wants input. The input
  40     // buffer should be updated to point to the data. The engine then needs to
  41     // be called again to retry the operation.
  42     want_input_and_retry = -2,
  43
  44     // Returned by functions to indicate that the engine wants to write output.
  45     // The output buffer points to the data to be written. The engine then
  46     // needs to be called again to retry the operation.
  47     want_output_and_retry = -1,
  48
  49     // Returned by functions to indicate that the engine doesn't need input or
  50     // output.
  51     want_nothing = 0,
  52
  53     // Returned by functions to indicate that the engine wants to write output.
  54     // The output buffer points to the data to be written. After that the
  55     // operation is complete, and the engine does not need to be called again.
  56     want_output = 1
  57   };
  58
  59   // Construct a new engine for the specified context.
  60   BOOST_ASIO_DECL explicit engine(SSL_CTX* context);
  61
  62 #if defined(BOOST_ASIO_HAS_MOVE)
  63   // Move construct from another engine.
  64   BOOST_ASIO_DECL engine(engine&& other) BOOST_ASIO_NOEXCEPT;
  65 #endif // defined(BOOST_ASIO_HAS_MOVE)
  66
  67   // Destructor.
  68   BOOST_ASIO_DECL ~engine();
  69
  70   // Get the underlying implementation in the native type.
  71   BOOST_ASIO_DECL SSL* native_handle();
  72
  73   // Set the peer verification mode.
  74   BOOST_ASIO_DECL boost::system::error_code set_verify_mode(
  75       verify_mode v, boost::system::error_code& ec);
  76
  77   // Set the peer verification depth.
  78   BOOST_ASIO_DECL boost::system::error_code set_verify_depth(
  79       int depth, boost::system::error_code& ec);
  80
  81   // Set a peer certificate verification callback.
  82   BOOST_ASIO_DECL boost::system::error_code set_verify_callback(
  83       verify_callback_base* callback, boost::system::error_code& ec);
  84
  85   // Perform an SSL handshake using either SSL_connect (client-side) or
  86   // SSL_accept (server-side).
  87   BOOST_ASIO_DECL want handshake(
  88       stream_base::handshake_type type, boost::system::error_code& ec);
  89
  90   // Perform a graceful shutdown of the SSL session.
  91   BOOST_ASIO_DECL want shutdown(boost::system::error_code& ec);
  92
  93   // Write bytes to the SSL session.
  94   BOOST_ASIO_DECL want write(const boost::asio::const_buffer& data,
  95       boost::system::error_code& ec, std::size_t& bytes_transferred);
  96
  97   // Read bytes from the SSL session.
  98   BOOST_ASIO_DECL want read(const boost::asio::mutable_buffer& data,
  99       boost::system::error_code& ec, std::size_t& bytes_transferred);
 100
 101   // Get output data to be written to the transport.
 102   BOOST_ASIO_DECL boost::asio::mutable_buffer get_output(
 103       const boost::asio::mutable_buffer& data);
 104
 105   // Put input data that was read from the transport.
 106   BOOST_ASIO_DECL boost::asio::const_buffer put_input(
 107       const boost::asio::const_buffer& data);
 108
 109   // Map an error::eof code returned by the underlying transport according to
 110   // the type and state of the SSL session. Returns a const reference to the
 111   // error code object, suitable for passing to a completion handler.
 112   BOOST_ASIO_DECL const boost::system::error_code& map_error_code(
 113       boost::system::error_code& ec) const;
 114
 115 private:
 116   // Disallow copying and assignment.
 117   engine(const engine&);
 118   engine& operator=(const engine&);
 119
 120   // Callback used when the SSL implementation wants to verify a certificate.
 121   BOOST_ASIO_DECL static int verify_callback_function(
 122       int preverified, X509_STORE_CTX* ctx);
 123
 124 #if (OPENSSL_VERSION_NUMBER < 0x10000000L)
 125   // The SSL_accept function may not be thread safe. This mutex is used to
 126   // protect all calls to the SSL_accept function.
 127   BOOST_ASIO_DECL static boost::asio::detail::static_mutex& accept_mutex();
 128 #endif // (OPENSSL_VERSION_NUMBER < 0x10000000L)
 129
 130   // Perform one operation. Returns >= 0 on success or error, want_read if the
 131   // operation needs more input, or want_write if it needs to write some output
 132   // before the operation can complete.
 133   BOOST_ASIO_DECL want perform(int (engine::* op)(void*, std::size_t),
 134       void* data, std::size_t length, boost::system::error_code& ec,
 135       std::size_t* bytes_transferred);
 136
 137   // Adapt the SSL_accept function to the signature needed for perform().
 138   BOOST_ASIO_DECL int do_accept(void*, std::size_t);
 139
 140   // Adapt the SSL_connect function to the signature needed for perform().
 141   BOOST_ASIO_DECL int do_connect(void*, std::size_t);
 142
 143   // Adapt the SSL_shutdown function to the signature needed for perform().
 144   BOOST_ASIO_DECL int do_shutdown(void*, std::size_t);
 145
 146   // Adapt the SSL_read function to the signature needed for perform().
 147   BOOST_ASIO_DECL int do_read(void* data, std::size_t length);
 148
 149   // Adapt the SSL_write function to the signature needed for perform().
 150   BOOST_ASIO_DECL int do_write(void* data, std::size_t length);
 151
 152   SSL* ssl_;
 153   BIO* ext_bio_;
 154 };
 155
 156 } // namespace detail
 157 } // namespace ssl
 158 } // namespace asio
 159 } // namespace boost
 160
 161 #include <boost/asio/detail/pop_options.hpp>
 162
 163 #if defined(BOOST_ASIO_HEADER_ONLY)
 164 # include <boost/asio/ssl/detail/impl/engine.ipp>
 165 #endif // defined(BOOST_ASIO_HEADER_ONLY)
 166
 167 #endif // BOOST_ASIO_SSL_DETAIL_ENGINE_HPP