1 files changed, 122 insertions, 0 deletions
diff --git a/src/lib/tls/tls_session_manager_memory.cpp b/src/lib/tls/tls_session_manager_memory.cpp
new file mode 100644
index 000000000..24ede276c
--- /dev/null
+++ b/src/lib/tls/tls_session_manager_memory.cpp
@@ -0,0 +1,122 @@
+/*
+* TLS Session Management
+* (C) 2011,2012 Jack Lloyd
+*
+* Released under the terms of the Botan license
+*/
+
+#include <botan/tls_session_manager.h>
+#include <botan/hex.h>
+#include <chrono>
+
+namespace Botan {
+
+namespace TLS {
+
+Session_Manager_In_Memory::Session_Manager_In_Memory(
+   RandomNumberGenerator& rng,
+   size_t max_sessions,
+   std::chrono::seconds session_lifetime) :
+   m_max_sessions(max_sessions),
+   m_session_lifetime(session_lifetime),
+   m_rng(rng),
+   m_session_key(m_rng, 32)
+   {}
+
+bool Session_Manager_In_Memory::load_from_session_str(
+   const std::string& session_str, Session& session)
+   {
+   // assert(lock is held)
+
+   auto i = m_sessions.find(session_str);
+
+   if(i == m_sessions.end())
+      return false;
+
+   try
+      {
+      session = Session::decrypt(i->second, m_session_key);
+      }
+   catch(...)
+      {
+      return false;
+      }
+
+   // if session has expired, remove it
+   const auto now = std::chrono::system_clock::now();
+
+   if(session.start_time() + session_lifetime() < now)
+      {
+      m_sessions.erase(i);
+      return false;
+      }
+
+   return true;
+   }
+
+bool Session_Manager_In_Memory::load_from_session_id(
+   const std::vector<byte>& session_id, Session& session)
+   {
+   std::lock_guard<std::mutex> lock(m_mutex);
+
+   return load_from_session_str(hex_encode(session_id), session);
+   }
+
+bool Session_Manager_In_Memory::load_from_server_info(
+   const Server_Information& info, Session& session)
+   {
+   std::lock_guard<std::mutex> lock(m_mutex);
+
+   auto i = m_info_sessions.find(info);
+
+   if(i == m_info_sessions.end())
+      return false;
+
+   if(load_from_session_str(i->second, session))
+      return true;
+
+   /*
+   * It existed at one point but was removed from the sessions map,
+   * remove m_info_sessions entry as well
+   */
+   m_info_sessions.erase(i);
+
+   return false;
+   }
+
+void Session_Manager_In_Memory::remove_entry(
+   const std::vector<byte>& session_id)
+   {
+   std::lock_guard<std::mutex> lock(m_mutex);
+
+   auto i = m_sessions.find(hex_encode(session_id));
+
+   if(i != m_sessions.end())
+      m_sessions.erase(i);
+   }
+
+void Session_Manager_In_Memory::save(const Session& session)
+   {
+   std::lock_guard<std::mutex> lock(m_mutex);
+
+   if(m_max_sessions != 0)
+      {
+      /*
+      We generate new session IDs with the first 4 bytes being a
+      timestamp, so this actually removes the oldest sessions first.
+      */
+      while(m_sessions.size() >= m_max_sessions)
+         m_sessions.erase(m_sessions.begin());
+      }
+
+   const std::string session_id_str = hex_encode(session.session_id());
+
+   m_sessions[session_id_str] = session.encrypt(m_session_key, m_rng);
+
+   if(session.side() == CLIENT && !session.server_info().empty())
+      m_info_sessions[session.server_info()] = session_id_str;
+   }
+
+}
+
+}