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Diffstat (limited to 'doc/examples/asio_tls_server.cpp')
| -rw-r--r-- | doc/examples/asio_tls_server.cpp | 335 |
1 files changed, 335 insertions, 0 deletions
diff --git a/doc/examples/asio_tls_server.cpp b/doc/examples/asio_tls_server.cpp new file mode 100644 index 000000000..e721d0455 --- /dev/null +++ b/doc/examples/asio_tls_server.cpp @@ -0,0 +1,335 @@ +#include <iostream> +#include <string> +#include <vector> + +#include <boost/asio.hpp> +#include <boost/bind.hpp> +#include <boost/thread.hpp> +#include <boost/shared_ptr.hpp> +#include <boost/enable_shared_from_this.hpp> + +#include <botan/tls_server.h> +#include <botan/x509cert.h> +#include <botan/pkcs8.h> +#include <botan/auto_rng.h> +#include <botan/init.h> + +#include "credentials.h" + +using Botan::byte; +using boost::asio::ip::tcp; + +class tls_server_session : public boost::enable_shared_from_this<tls_server_session> + { + public: + typedef boost::shared_ptr<tls_server_session> pointer; + + static pointer create(boost::asio::io_service& io_service, + Botan::TLS::Session_Manager& session_manager, + Botan::Credentials_Manager& credentials, + Botan::TLS::Policy& policy, + Botan::RandomNumberGenerator& rng) + { + return pointer( + new tls_server_session( + io_service, + session_manager, + credentials, + policy, + rng) + ); + } + + tcp::socket& socket() { return m_socket; } + + void start() + { + m_socket.async_read_some( + boost::asio::buffer(m_read_buf, sizeof(m_read_buf)), + m_strand.wrap( + boost::bind(&tls_server_session::handle_read, shared_from_this(), + boost::asio::placeholders::error, + boost::asio::placeholders::bytes_transferred))); + } + + void stop() { m_socket.close(); } + + private: + tls_server_session(boost::asio::io_service& io_service, + Botan::TLS::Session_Manager& session_manager, + Botan::Credentials_Manager& credentials, + Botan::TLS::Policy& policy, + Botan::RandomNumberGenerator& rng) : + m_strand(io_service), + m_socket(io_service), + m_tls(boost::bind(&tls_server_session::tls_output_wanted, this, _1, _2), + boost::bind(&tls_server_session::tls_data_recv, this, _1, _2, _3), + boost::bind(&tls_server_session::tls_handshake_complete, this, _1), + session_manager, + credentials, + policy, + rng) + { + } + + void handle_read(const boost::system::error_code& error, + size_t bytes_transferred) + { + if(!error) + { + try + { + m_tls.received_data(m_read_buf, bytes_transferred); + } + catch(std::exception& e) + { + std::cout << "Read failed " << e.what() << "\n"; + stop(); + return; + } + + m_socket.async_read_some( + boost::asio::buffer(m_read_buf, sizeof(m_read_buf)), + m_strand.wrap(boost::bind(&tls_server_session::handle_read, shared_from_this(), + boost::asio::placeholders::error, + boost::asio::placeholders::bytes_transferred))); + } + else + { + stop(); + } + } + + void handle_write(const boost::system::error_code& error) + { + if(!error) + { + m_write_buf.clear(); + + // initiate another write if needed + tls_output_wanted(NULL, 0); + } + else + { + stop(); + } + } + + void tls_output_wanted(const byte buf[], size_t buf_len) + { + if(buf_len > 0) + m_outbox.insert(m_outbox.end(), buf, buf + buf_len); + + // no write pending and have output pending + if(m_write_buf.empty() && !m_outbox.empty()) + { + std::swap(m_outbox, m_write_buf); + + boost::asio::async_write(m_socket, + boost::asio::buffer(&m_write_buf[0], m_write_buf.size()), + m_strand.wrap( + boost::bind(&tls_server_session::handle_write, + shared_from_this(), + boost::asio::placeholders::error))); + } + } + + void tls_data_recv(const byte buf[], size_t buf_len, Botan::TLS::Alert alert) + { + if(alert.is_valid()) + { + if(alert.type() == Botan::TLS::Alert::CLOSE_NOTIFY) + { + m_tls.close(); + return; + } + } + + if(buf_len > 4) // FIXME: ghetto + { + std::string out; + out += "\r\n"; + out += "HTTP/1.0 200 OK\r\n"; + out += "Server: Botan ASIO test server\r\n"; + if(m_hostname != "") + out += "Host: " + m_hostname + "\r\n"; + out += "Content-Type: text/html\r\n"; + out += "\r\n"; + out += "<html><body>Greets. You said: "; + out += std::string((const char*)buf, buf_len); + out += "</body></html>\r\n\r\n"; + + m_tls.send(reinterpret_cast<const byte*>(&out[0]), + out.size()); + m_tls.close(); + } + } + + bool tls_handshake_complete(const Botan::TLS::Session& session) + { + m_hostname = session.sni_hostname(); + return true; + } + + boost::asio::io_service::strand m_strand; // serialization + + tcp::socket m_socket; + Botan::TLS::Server m_tls; + std::string m_hostname; + + unsigned char m_read_buf[Botan::TLS::MAX_TLS_RECORD_SIZE]; + + // used to hold the data currently being written by the system + std::vector<byte> m_write_buf; + + // used to hold data queued for writing + std::vector<byte> m_outbox; + }; + +class Session_Manager_Locked : public Botan::TLS::Session_Manager + { + public: + bool load_from_session_id(const Botan::MemoryRegion<byte>& session_id, + Botan::TLS::Session& session) + { + boost::lock_guard<boost::mutex> lock(m_mutex); + return m_session_manager.load_from_session_id(session_id, session); + } + + bool load_from_host_info(const std::string& hostname, Botan::u16bit port, + Botan::TLS::Session& session) + { + boost::lock_guard<boost::mutex> lock(m_mutex); + return m_session_manager.load_from_host_info(hostname, port, session); + }; + + void remove_entry(const Botan::MemoryRegion<byte>& session_id) + { + boost::lock_guard<boost::mutex> lock(m_mutex); + m_session_manager.remove_entry(session_id); + } + + void save(const Botan::TLS::Session& session) + { + boost::lock_guard<boost::mutex> lock(m_mutex); + m_session_manager.save(session); + } + + Botan::u32bit session_lifetime() const + { + return m_session_manager.session_lifetime(); + } + + private: + boost::mutex m_mutex; + Botan::TLS::Session_Manager_In_Memory m_session_manager; + + }; + +class tls_server + { + public: + typedef tls_server_session session; + + tls_server(boost::asio::io_service& io_service, unsigned short port) : + m_acceptor(io_service, tcp::endpoint(tcp::v4(), port)), + m_creds(m_rng) + { + session::pointer new_session = make_session(); + + m_acceptor.async_accept( + new_session->socket(), + boost::bind( + &tls_server::handle_accept, + this, + new_session, + boost::asio::placeholders::error) + ); + } + + private: + session::pointer make_session() + { + return session::create( + m_acceptor.get_io_service(), + m_session_manager, + m_creds, + m_policy, + m_rng + ); + } + + void handle_accept(session::pointer new_session, + const boost::system::error_code& error) + { + if (!error) + { + new_session->start(); + + new_session = make_session(); + + m_acceptor.async_accept( + new_session->socket(), + boost::bind( + &tls_server::handle_accept, + this, + new_session, + boost::asio::placeholders::error) + ); + } + } + + tcp::acceptor m_acceptor; + + Botan::AutoSeeded_RNG m_rng; + Session_Manager_Locked m_session_manager; + Botan::TLS::Policy m_policy; + Credentials_Manager_Simple m_creds; + }; + +size_t choose_thread_count() + { + size_t result = boost::thread::hardware_concurrency(); + + if(result) + return result; + + return 2; + } + +int main() + { + try + { + Botan::LibraryInitializer init("thread_safe=true"); + boost::asio::io_service io_service; + + unsigned short port = 4434; + tls_server server(io_service, port); + + const size_t num_threads = choose_thread_count(); + + std::cout << "Using " << num_threads << " threads\n"; + + std::vector<boost::shared_ptr<boost::thread> > threads; + + for(size_t i = 0; i != num_threads; ++i) + { + boost::shared_ptr<boost::thread> thread( + new boost::thread( + boost::bind(&boost::asio::io_service::run, &io_service))); + threads.push_back(thread); + } + + // Wait for all threads in the pool to exit. + for (size_t i = 0; i < threads.size(); ++i) + threads[i]->join(); + } + catch (std::exception& e) + { + std::cerr << e.what() << std::endl; + } + + return 0; + } + |