1 files changed, 120 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/tls/asio/asio_context.h b/comm/third_party/botan/src/lib/tls/asio/asio_context.h
new file mode 100644
index 0000000000..e225fde6a2
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+++ b/comm/third_party/botan/src/lib/tls/asio/asio_context.h
@@ -0,0 +1,120 @@
+/*
+ * 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_