| /* |
| * Copyright (C) 2004-2023 Savoir-faire Linux Inc. |
| * |
| * This program is free software: you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation, either version 3 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program. If not, see <https://www.gnu.org/licenses/>. |
| */ |
| #pragma once |
| |
| //#include "noncopyable.h" |
| #include "generic_io.h" |
| #include "certstore.h" |
| #include "diffie-hellman.h" |
| |
| #include <gnutls/gnutls.h> |
| #include <asio/io_context.hpp> |
| |
| #include <string> |
| #include <functional> |
| #include <memory> |
| #include <future> |
| #include <chrono> |
| #include <vector> |
| #include <array> |
| |
| namespace dht { |
| namespace crypto { |
| struct Certificate; |
| struct PrivateKey; |
| } // namespace crypto |
| } // namespace dht |
| |
| namespace dhtnet { |
| namespace tls { |
| |
| enum class TlsSessionState { |
| NONE, |
| SETUP, |
| COOKIE, // only used with non-initiator and non-reliable transport |
| HANDSHAKE, |
| MTU_DISCOVERY, // only used with non-reliable transport |
| ESTABLISHED, |
| SHUTDOWN |
| }; |
| |
| using clock = std::chrono::steady_clock; |
| using duration = clock::duration; |
| |
| struct TlsParams |
| { |
| // User CA list for session credentials |
| std::string ca_list; |
| |
| std::shared_ptr<dht::crypto::Certificate> peer_ca; |
| |
| // User identity for credential |
| std::shared_ptr<dht::crypto::Certificate> cert; |
| std::shared_ptr<dht::crypto::PrivateKey> cert_key; |
| |
| // Diffie-Hellman computed by gnutls_dh_params_init/gnutls_dh_params_generateX |
| std::shared_future<DhParams> dh_params; |
| |
| tls::CertificateStore& certStore; |
| |
| // handshake timeout |
| duration timeout; |
| |
| // Callback for certificate checkings |
| std::function<int(unsigned status, const gnutls_datum_t* cert_list, unsigned cert_list_size)> |
| cert_check; |
| |
| std::shared_ptr<asio::io_context> io_context; |
| |
| std::shared_ptr<Logger> logger; |
| }; |
| |
| /// TlsSession |
| /// |
| /// Manages a TLS/DTLS data transport overlayed on a given generic socket. |
| /// |
| /// \note API is not thread-safe. |
| /// |
| class TlsSession : public GenericSocket<uint8_t> |
| { |
| public: |
| using SocketType = GenericSocket<uint8_t>; |
| using OnStateChangeFunc = std::function<void(TlsSessionState)>; |
| using OnRxDataFunc = std::function<void(std::vector<uint8_t>&&)>; |
| using OnCertificatesUpdate |
| = std::function<void(const gnutls_datum_t*, const gnutls_datum_t*, unsigned int)>; |
| using VerifyCertificate = std::function<int(gnutls_session_t)>; |
| |
| // ===> WARNINGS <=== |
| // Following callbacks are called into the FSM thread context |
| // Do not call blocking routines inside them. |
| using TlsSessionCallbacks = struct |
| { |
| OnStateChangeFunc onStateChange; |
| OnRxDataFunc onRxData; |
| OnCertificatesUpdate onCertificatesUpdate; |
| VerifyCertificate verifyCertificate; |
| }; |
| |
| TlsSession(std::unique_ptr<SocketType>&& transport, |
| const TlsParams& params, |
| const TlsSessionCallbacks& cbs, |
| bool anonymous = true); |
| ~TlsSession(); |
| |
| /// Request TLS thread to stop and quit. |
| /// \note IO operations return error after this call. |
| void shutdown() override; |
| |
| void setOnRecv(RecvCb&& cb) override |
| { |
| (void) cb; |
| throw std::logic_error("TlsSession::setOnRecv not implemented"); |
| } |
| |
| /// Return true if the TLS session type is a server. |
| bool isInitiator() const override; |
| |
| bool isReliable() const override; |
| |
| int maxPayload() const override; |
| |
| /// Synchronous writing. |
| /// Return a positive number for number of bytes write, or 0 and \a ec set in case of error. |
| std::size_t write(const ValueType* data, std::size_t size, std::error_code& ec) override; |
| |
| /// Synchronous reading. |
| /// Return a positive number for number of bytes read, or 0 and \a ec set in case of error. |
| std::size_t read(ValueType* data, std::size_t size, std::error_code& ec) override; |
| |
| int waitForData(std::chrono::milliseconds, std::error_code&) const override; |
| |
| std::shared_ptr<dht::crypto::Certificate> peerCertificate() const; |
| |
| const std::shared_ptr<dht::log::Logger>& logger() const; |
| |
| private: |
| class TlsSessionImpl; |
| std::unique_ptr<TlsSessionImpl> pimpl_; |
| }; |
| |
| } // namespace tls |
| } // namespace dhtnet |