servers.h

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/*
 * SNode.C - a slim toolkit for network communication
 * Copyright (C) Volker Christian <me@vchrist.at>
 *               2020, 2021, 2022, 2023, 2024, 2025
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef APPS_ECHO_MODEL_SERVER_H
#define APPS_ECHO_MODEL_SERVER_H
 
#include "log/Logger.h"
 
#define QUOTE_INCLUDE(a) STR_INCLUDE(a)
#define STR_INCLUDE(a) #a
 
// clang-format off
#define SOCKETSERVER_INCLUDE QUOTE_INCLUDE(net/NET/stream/STREAM/SocketServer.h)
// clang-format on
 
#include SOCKETSERVER_INCLUDE // IWYU pragma: export
 
#include "EchoSocketContext.h"
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#include <string>
 
#if (STREAM_TYPE == TLS) // tls
#include <cstddef>
#include <openssl/ssl.h>
#include <openssl/x509v3.h>
#endif
 
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
 
#if (STREAM_TYPE == LEGACY) // legacy
 
namespace apps::echo::model::legacy {
 
    using EchoSocketServer = net::NET::stream::legacy::SocketServer<EchoServerSocketContextFactory>;
 
    EchoSocketServer getServer() {
        return EchoSocketServer("echoserver");
    }
 
} // namespace apps::echo::model::legacy
 
#elif (STREAM_TYPE == TLS) // tls
 
namespace apps::echo::model::tls {
 
    using EchoSocketServer = net::NET::stream::tls::SocketServer<EchoServerSocketContextFactory>;
    using SocketConnection = EchoSocketServer::SocketConnection;
 
    EchoSocketServer getServer() {
        EchoSocketServer server("echoserver");
 
        server.setOnConnect([&server](SocketConnection* socketConnection) { // onConnect
            VLOG(1) << "OnConnect " << server.getConfig().getInstanceName();
 
            VLOG(1) << "\tLocal: " << socketConnection->getLocalAddress().toString();
            VLOG(1) << "\tPeer:  " << socketConnection->getRemoteAddress().toString();
 
            /* Enable automatic hostname checks */
            // X509_VERIFY_PARAM* param = SSL_get0_param(socketConnection->getSSL());
 
            // X509_VERIFY_PARAM_set_hostflags(param, X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS);
            // if (!X509_VERIFY_PARAM_set1_host(param, "localhost", sizeof("localhost") - 1)) {
            //   // handle error
            //   socketConnection->close();
            // }
        });
 
        server.setOnConnected([&server](SocketConnection* socketConnection) { // onConnected
            VLOG(1) << "OnConnected " << server.getConfig().getInstanceName();
 
            X509* server_cert = SSL_get_peer_certificate(socketConnection->getSSL());
            if (server_cert != nullptr) {
                long verifyErr = SSL_get_verify_result(socketConnection->getSSL());
 
                VLOG(1) << "\tPeer certificate verifyErr = " + std::to_string(verifyErr) + ": " +
                               std::string(X509_verify_cert_error_string(verifyErr));
 
                char* str = X509_NAME_oneline(X509_get_subject_name(server_cert), nullptr, 0);
                VLOG(1) << "\t   Subject: " + std::string(str);
                OPENSSL_free(str);
 
                str = X509_NAME_oneline(X509_get_issuer_name(server_cert), nullptr, 0);
                VLOG(1) << "\t   Issuer: " + std::string(str);
                OPENSSL_free(str);
 
                // We could do all sorts of certificate verification stuff here before deallocating the certificate.
 
                GENERAL_NAMES* subjectAltNames =
                    static_cast<GENERAL_NAMES*>(X509_get_ext_d2i(server_cert, NID_subject_alt_name, nullptr, nullptr));
#ifdef __GNUC__
#pragma GCC diagnostic push
#ifdef __has_warning
#if __has_warning("-Wused-but-marked-unused")
#pragma GCC diagnostic ignored "-Wused-but-marked-unused"
#endif
#endif
#endif
                int32_t altNameCount = sk_GENERAL_NAME_num(subjectAltNames);
#ifdef __GNUC_
#pragma GCC diagnostic pop
#endif
                VLOG(1) << "\t   Subject alternative name count: " << altNameCount;
                for (int32_t i = 0; i < altNameCount; ++i) {
#ifdef __GNUC__
#pragma GCC diagnostic push
#ifdef __has_warning
#if __has_warning("-Wused-but-marked-unused")
#pragma GCC diagnostic ignored "-Wused-but-marked-unused"
#endif
#endif
#endif
                    GENERAL_NAME* generalName = sk_GENERAL_NAME_value(subjectAltNames, i);
#ifdef __GNUC_
#pragma GCC diagnostic pop
#endif
                    if (generalName->type == GEN_URI) {
                        std::string subjectAltName =
                            std::string(reinterpret_cast<const char*>(ASN1_STRING_get0_data(generalName->d.uniformResourceIdentifier)),
                                        static_cast<std::size_t>(ASN1_STRING_length(generalName->d.uniformResourceIdentifier)));
                        VLOG(1) << "\t      SAN (URI): '" + subjectAltName;
                    } else if (generalName->type == GEN_DNS) {
                        std::string subjectAltName =
                            std::string(reinterpret_cast<const char*>(ASN1_STRING_get0_data(generalName->d.dNSName)),
                                        static_cast<std::size_t>(ASN1_STRING_length(generalName->d.dNSName)));
                        VLOG(1) << "\t      SAN (DNS): '" + subjectAltName;
                    } else {
                        VLOG(1) << "\t      SAN (Type): '" + std::to_string(generalName->type);
                    }
                }
#ifdef __GNUC__
#pragma GCC diagnostic push
#ifdef __has_warning
#if __has_warning("-Wused-but-marked-unused")
#pragma GCC diagnostic ignored "-Wused-but-marked-unused"
#endif
#endif
#endif
                sk_GENERAL_NAME_pop_free(subjectAltNames, GENERAL_NAME_free);
#ifdef __GNUC_
#pragma GCC diagnostic pop
#endif
                X509_free(server_cert);
            } else {
                VLOG(1) << "\tPeer certificate: no certificate";
            }
        });
 
        server.setOnDisconnect([&server](SocketConnection* socketConnection) { // onDisconnect
            VLOG(1) << "OnDisconnect " << server.getConfig().getInstanceName();
 
            VLOG(1) << "\tLocal: " << socketConnection->getLocalAddress().toString();
            VLOG(1) << "\tPeer:  " << socketConnection->getRemoteAddress().toString();
        });
 
        return server;
    }
 
} // namespace apps::echo::model::tls
 
#endif
 
#endif // APPS_ECHO_MODEL_SERVER_H