tls_server.cpp

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/*
* TLS Server
* (C) 2004-2011,2012,2016 Jack Lloyd
*     2016 Matthias Gierlings
*     2021 Elektrobit Automotive GmbH
*     2022 René Meusel, Hannes Rantzsch - neXenio GmbH
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
 
#include <botan/tls_server.h>
 
#include <botan/tls_policy.h>
#include <botan/x509cert.h>
#include <botan/internal/tls_channel_impl.h>
 
#if defined(BOTAN_HAS_TLS_12)
   #include <botan/internal/tls_server_impl_12.h>
#endif
 
#if defined(BOTAN_HAS_TLS_13)
   #include <botan/internal/tls_server_impl_13.h>
#endif
 
namespace Botan::TLS {
 
/*
* TLS Server Constructor
*/
Server::Server(const std::shared_ptr<Callbacks>& callbacks,
               const std::shared_ptr<Session_Manager>& session_manager,
               const std::shared_ptr<Credentials_Manager>& creds,
               const std::shared_ptr<const Policy>& policy,
               const std::shared_ptr<RandomNumberGenerator>& rng,
               bool is_datagram,
               size_t io_buf_sz) {
   const auto max_version = policy->latest_supported_version(is_datagram);
 
#if defined(BOTAN_HAS_TLS_13)
   if(!max_version.is_pre_tls_13()) {
      m_impl = std::make_unique<Server_Impl_13>(callbacks, session_manager, creds, policy, rng);
 
   #if defined(BOTAN_HAS_TLS_DOWNGRADE_SUPPORT)
      if(m_impl->expects_downgrade()) {
         m_impl->set_io_buffer_size(io_buf_sz);
      }
   #endif
 
      return;
   }
#endif
 
#if defined(BOTAN_HAS_TLS_12)
   if(max_version.is_pre_tls_13()) {
      m_impl = std::make_unique<Server_Impl_12>(callbacks, session_manager, creds, policy, rng, is_datagram, io_buf_sz);
      return;
   }
#endif
 
   BOTAN_UNUSED(max_version, callbacks, session_manager, creds, policy, rng, is_datagram, io_buf_sz);
   throw Not_Implemented("Requested TLS server version is not available in this build");
}
 
Server::~Server() = default;
 
size_t Server::from_peer(std::span<const uint8_t> data) {
   auto read = m_impl->from_peer(data);
 
#if defined(BOTAN_HAS_TLS_DOWNGRADE_SUPPORT)
   // If TLS 1.2 is not available, we will never downgrade, the downgrade info
   // won't even be created and `is_downgrading()` would always return false.
   if(m_impl->is_downgrading()) {
      auto info = m_impl->extract_downgrade_info();
      m_impl = std::make_unique<Server_Impl_12>(*info);
 
      // replay peer data received so far
      read = m_impl->from_peer(info->peer_transcript);
   }
#endif
 
   return read;
}
 
bool Server::is_handshake_complete() const {
   return m_impl->is_handshake_complete();
}
 
bool Server::is_active() const {
   return m_impl->is_active();
}
 
std::optional<std::chrono::milliseconds> Server::next_retransmission_timeout() const {
   return m_impl->next_retransmission_timeout();
}
 
bool Server::is_closed() const {
   return m_impl->is_closed();
}
 
bool Server::is_closed_for_reading() const {
   return m_impl->is_closed_for_reading();
}
 
bool Server::is_closed_for_writing() const {
   return m_impl->is_closed_for_writing();
}
 
std::vector<X509_Certificate> Server::peer_cert_chain() const {
   return m_impl->peer_cert_chain();
}
 
std::shared_ptr<const Public_Key> Server::peer_raw_public_key() const {
   return m_impl->peer_raw_public_key();
}
 
std::optional<std::string> Server::external_psk_identity() const {
   return m_impl->external_psk_identity();
}
 
SymmetricKey Server::key_material_export(std::string_view label, std::string_view context, size_t length) const {
   return m_impl->key_material_export(label, context, length);
}
 
void Server::renegotiate(bool force_full_renegotiation) {
   m_impl->renegotiate(force_full_renegotiation);
}
 
bool Server::new_session_ticket_supported() const {
   return m_impl->new_session_ticket_supported();
}
 
size_t Server::send_new_session_tickets(const size_t tickets) {
   return m_impl->send_new_session_tickets(tickets);
}
 
void Server::update_traffic_keys(bool request_peer_update) {
   m_impl->update_traffic_keys(request_peer_update);
}
 
bool Server::secure_renegotiation_supported() const {
   return m_impl->secure_renegotiation_supported();
}
 
void Server::to_peer(std::span<const uint8_t> data) {
   m_impl->to_peer(data);
}
 
void Server::send_alert(const Alert& alert) {
   m_impl->send_alert(alert);
}
 
void Server::send_warning_alert(Alert::Type type) {
   m_impl->send_warning_alert(type);
}
 
void Server::send_fatal_alert(Alert::Type type) {
   m_impl->send_fatal_alert(type);
}
 
void Server::close() {
   m_impl->close();
}
 
bool Server::timeout_check() {
   return m_impl->timeout_check();
}
 
std::string Server::application_protocol() const {
   return m_impl->application_protocol();
}
}  // namespace Botan::TLS