WebEngine/net/connection_info_libtls.cpp at master · usadson/WebEngine · GitHub

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/**
 * Copyright (C) 2020 Tristan. All Rights Reserved.
 * This file is licensed under the BSD 2-Clause license.
 * See the COPYING file for licensing information.
 */

#include "connection_info.hpp"

#include <chrono>
#include <iostream>
#include <sstream>
#include <vector>

#include <tls.h>

#include "logger.hpp"

namespace Net {

	void
	ConnectionInfo::TLSDestroy() {
		Logger::Debug(static_cast<const char *>(__PRETTY_FUNCTION__), "Called");
		tls_close(static_cast<struct tls *>(tlsContext));
		tls_free(static_cast<struct tls *>(tlsContext));
		tlsContext = nullptr;
	}

	bool
	ConnectionInfo::TLSRead(char *buf, std::size_t len) {
		do {
			auto ret = tls_read(static_cast<struct tls *>(tlsContext), buf, len);
			if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT)
				continue;

			if (ret == -1)
				return false;

			buf += ret;
			len -= ret;
		} while (len > 0);

		return true;
	}

	std::optional<char>
	ConnectionInfo::TLSReadChar() {
		char character;

		if (tls_read(static_cast<struct tls *>(tlsContext), &character, 1) == -1)
			return std::optional<char>();

		return std::optional<char>(character);
	}

	bool
	ConnectionInfo::TLSSetup() {
		struct tls_config *config = tls_config_new();

		if (config == nullptr) {
			Logger::Severe("ConnectionInfo::TLSSetup[libtls]", "Failed to create configuration! (Out of memory!)");
			return false;
		}

		if (tls_config_set_alpn(config, tlsALPNProtocols.c_str()) == -1) {
			Logger::Severe(
				"ConnectionInfo::TLSSetup[libtls]", std::string("Failed to set ALPN: ") + tls_config_error(config));
			tls_config_free(config);
			return false;
		}

		struct tls *context = tls_client();
		if (context == nullptr) {
			Logger::Severe("ConnectionInfo::TLSSetup[libtls]", "Failed to create tls_client (Out of memory!)");
			tls_config_free(config);
			return false;
		}

		if (tls_configure(context, config) == -1) {
			Logger::Severe("ConnectionInfo::TLSSetup[libtls]",
				std::string("Failed to configure TLS context: ") + tls_error(context));
			tls_free(context);
			tls_config_free(config);
			return false;
		}

		tls_config_free(config);
		config = nullptr;

		if (tls_connect_socket(context, socket, hostName.c_str()) == -1) {
			Logger::Warning("ConnectionInfo::TLSSetup[libtls]",
				std::string("Failed to setup secure connection with ") + hostName + ": " + tls_error(context));
			tls_free(context);
			return false;
		}

		if (tls_handshake(context) == -1) {
			Logger::Warning(
				"ConnectionInfo::TLSSetup[libtls]", std::string("Failed to setup secure connection (handshake) with ")
														+ hostName + ": " + tls_error(context));
			tls_free(context);
			return false;
		}

		std::cout << "TLS Information:"
				  << "\nTLSVersion=" << tls_conn_version(context) << "\nCipher=" << tls_conn_cipher(context)
				  << "\nCipherStrength=" << tls_conn_cipher_strength(context)
				  << "\nServerName=" << tls_conn_servername(context)
				  << "\nCertificateIssuer=" << tls_peer_cert_issuer(context)
				  << "\nCertificateSubject=" << tls_peer_cert_subject(context)
				  << "\nCertificateHash=" << tls_peer_cert_hash(context) << std::endl;

		tlsContext = context;
		isAuthenticated = true;
		return true;
	}

	bool
	ConnectionInfo::TLSWrite(const char *buf, std::size_t len) {
		do {
			auto ret = tls_write(static_cast<struct tls *>(tlsContext), buf, len);

			if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT)
				continue;

			if (ret == -1)
				return false;

			buf += ret;
			len -= ret;
		} while (len > 0);

		return true;
	}

} // namespace Net