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/*
* TLS Context
* (C) 2018-2020 Jack Lloyd
* 2018-2020 Hannes Rantzsch, Tim Oesterreich, Rene Meusel
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_ASIO_TLS_CONTEXT_H_
#define BOTAN_ASIO_TLS_CONTEXT_H_
#include <botan/build.h>
#include <boost/version.hpp>
#if BOOST_VERSION >= 106600
#include <functional>
#include <botan/credentials_manager.h>
#include <botan/ocsp.h>
#include <botan/rng.h>
#include <botan/tls_callbacks.h>
#include <botan/tls_policy.h>
#include <botan/tls_server_info.h>
#include <botan/tls_session_manager.h>
namespace Botan {
namespace TLS {
namespace detail {
template <typename FunT>
struct fn_signature_helper : public std::false_type {};
template <typename R, typename D, typename... Args>
struct fn_signature_helper<R(D::*)(Args...)>
{
using type = std::function<R(Args...)>;
};
} // namespace detail
/**
* A helper class to initialize and configure Botan::TLS::Stream
*/
class Context
{
public:
// statically extract the function signature type from Callbacks::tls_verify_cert_chain
// and reuse it as an std::function<> for the verify callback signature
/**
* The signature of the callback function should correspond to the signature of
* Callbacks::tls_verify_cert_chain
*/
using Verify_Callback =
detail::fn_signature_helper<decltype(&Callbacks::tls_verify_cert_chain)>::type;
Context(Credentials_Manager& credentials_manager,
RandomNumberGenerator& rng,
Session_Manager& session_manager,
Policy& policy,
Server_Information server_info = Server_Information()) :
m_credentials_manager(credentials_manager),
m_rng(rng),
m_session_manager(session_manager),
m_policy(policy),
m_server_info(server_info)
{}
virtual ~Context() = default;
Context(Context&&) = default;
Context(const Context&) = delete;
Context& operator=(const Context&) = delete;
Context& operator=(Context&&) = delete;
/**
* @brief Override the tls_verify_cert_chain callback
*
* This changes the verify_callback in the stream's TLS::Context, and hence the tls_verify_cert_chain callback
* used in the handshake.
* Using this function is equivalent to setting the callback via @see Botan::TLS::Stream::set_verify_callback
*
* @note This function should only be called before initiating the TLS handshake
*/
void set_verify_callback(Verify_Callback callback)
{
m_verify_callback = std::move(callback);
}
bool has_verify_callback() const
{
return static_cast<bool>(m_verify_callback);
}
const Verify_Callback& get_verify_callback() const
{
return m_verify_callback;
}
void set_server_info(const Server_Information& server_info)
{
m_server_info = server_info;
}
protected:
template <class S, class C> friend class Stream;
Credentials_Manager& m_credentials_manager;
RandomNumberGenerator& m_rng;
Session_Manager& m_session_manager;
Policy& m_policy;
Server_Information m_server_info;
Verify_Callback m_verify_callback;
};
} // namespace TLS
} // namespace Botan
#endif // BOOST_VERSION
#endif // BOTAN_ASIO_TLS_CONTEXT_H_
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