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// Copyright (C) 2021-2022 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
// Do not include this header directly: use crypto_tls.h instead.
#ifndef OPENSSL_TLS_H
#define OPENSSL_TLS_H
/// @file openssl_tls.h OpenSSL implementation of the TLS API.
#ifdef WITH_OPENSSL
#include <asiolink/asio_wrapper.h>
#include <asiolink/io_asio_socket.h>
#include <asiolink/io_service.h>
#include <asiolink/common_tls.h>
#include <boost/asio/ssl.hpp>
namespace isc {
namespace asiolink {
/// @brief Translate TLS role into implementation.
inline boost::asio::ssl::stream_base::handshake_type roleToImpl(TlsRole role) {
if (role == TlsRole::SERVER) {
return (boost::asio::ssl::stream_base::server);
} else {
return (boost::asio::ssl::stream_base::client);
}
}
/// @brief OpenSSL TLS context.
class TlsContext : public TlsContextBase {
public:
/// @brief Destructor.
virtual ~TlsContext() { }
/// @brief Create a fresh context.
///
/// @param role The TLS role client or server.
explicit TlsContext(TlsRole role);
/// @brief Return a reference to the underlying context.
boost::asio::ssl::context& getContext();
/// @brief Return the pointer to the SSL_CTX object.
///
/// Currently used only for tests. Please note that since OpenSSL 1.1
/// The SSL_CTX type is not fully publicly defined.
::SSL_CTX* getNativeContext();
/// @brief Get the peer certificate requirement mode.
///
/// @return True if peer certificates are required, false if they
/// are optional.
virtual bool getCertRequired() const;
/// @brief Get the error message.
///
/// @note Wrapper against OpenSSL 3.x not returning error messages
/// from system errors.
///
/// @param ec The Boost error code.
/// @return The error message.
static std::string getErrMsg(boost::system::error_code ec);
protected:
/// @brief Set the peer certificate requirement mode.
///
/// @param cert_required True if peer certificates are required,
/// false if they are optional.
virtual void setCertRequired(bool cert_required);
/// @brief Load the trust anchor aka certification authority.
///
/// @param ca_file The certificate file name.
virtual void loadCaFile(const std::string& ca_file);
/// @brief Load the trust anchor aka certification authority.
///
/// @param ca_path The certificate directory name.
virtual void loadCaPath(const std::string& ca_path);
/// @brief Load the certificate file.
///
/// @param cert_file The certificate file name.
virtual void loadCertFile(const std::string& cert_file);
/// @brief Load the private key from a file.
///
/// @param key_file The private key file name.
virtual void loadKeyFile(const std::string& key_file);
/// @brief Cached cert_required value.
bool cert_required_;
/// @brief Boost ASIO SSL object.
boost::asio::ssl::context context_;
/// @brief Allow access to protected methods by the base class.
friend class TlsContextBase;
};
/// @brief The type of underlying TLS streams.
typedef boost::asio::ssl::stream<boost::asio::ip::tcp::socket> TlsStreamImpl;
/// @brief TlsStreamBase constructor.
///
/// @tparam Callback The type of callbacks.
/// @tparam TlsStreamImpl The type of underlying TLS streams.
/// @param service I/O Service object used to manage the stream.
/// @param context Pointer to the TLS context.
/// @note The caller must not provide a null pointer to the TLS context.
template <typename Callback, typename TlsStreamImpl>
TlsStreamBase<Callback, TlsStreamImpl>::
TlsStreamBase(IOService& service, TlsContextPtr context)
: TlsStreamImpl(service.get_io_service(), context->getContext()),
role_(context->getRole()) {
}
/// @brief OpenSSL TLS stream.
///
/// @tparam callback The callback.
template <typename Callback>
class TlsStream : public TlsStreamBase<Callback, TlsStreamImpl> {
public:
/// @brief Type of the base.
typedef TlsStreamBase<Callback, TlsStreamImpl> Base;
/// @brief Constructor.
///
/// @param service I/O Service object used to manage the stream.
/// @param context Pointer to the TLS context.
/// @note The caller must not provide a null pointer to the TLS context.
TlsStream(IOService& service, TlsContextPtr context)
: Base(service, context) {
}
/// @brief Destructor.
virtual ~TlsStream() { }
/// @brief TLS Handshake.
///
/// @param callback Callback object.
virtual void handshake(Callback& callback) {
Base::async_handshake(roleToImpl(Base::getRole()), callback);
}
/// @brief TLS shutdown.
///
/// @param callback Callback object.
virtual void shutdown(Callback& callback) {
Base::async_shutdown(callback);
}
/// @brief Return the commonName part of the subjectName of
/// the peer certificate.
///
/// First commonName when there are more than one, in UTF-8.
/// RFC 3280 provides as a commonName example "Susan Housley",
/// to idea to give access to this come from the Role Based
/// Access Control experiment.
///
///
/// @return The commonName part of the subjectName or the empty string.
virtual std::string getSubject() {
::X509* cert = ::SSL_get_peer_certificate(this->native_handle());
if (!cert) {
return ("");
}
::X509_NAME *name = ::X509_get_subject_name(cert);
int loc = ::X509_NAME_get_index_by_NID(name, NID_commonName, -1);
::X509_NAME_ENTRY* ne = ::X509_NAME_get_entry(name, loc);
if (!ne) {
::X509_free(cert);
return ("");
}
unsigned char* buf = 0;
int len = ::ASN1_STRING_to_UTF8(&buf, ::X509_NAME_ENTRY_get_data(ne));
if (len < 0) {
::X509_free(cert);
return ("");
}
std::string ret(reinterpret_cast<char*>(buf), static_cast<size_t>(len));
::OPENSSL_free(buf);
::X509_free(cert);
return (ret);
}
/// @brief Return the commonName part of the issuerName of
/// the peer certificate.
///
/// First commonName when there are more than one, in UTF-8.
/// The issuerName is the subjectName of the signing certificate
/// (the issue in PKIX terms). The idea is to encode a group as
/// members of an intermediate certification authority.
///
///
/// @return The commonName part of the issuerName or the empty string.
virtual std::string getIssuer() {
::X509* cert = ::SSL_get_peer_certificate(this->native_handle());
if (!cert) {
return ("");
}
::X509_NAME *name = ::X509_get_issuer_name(cert);
int loc = ::X509_NAME_get_index_by_NID(name, NID_commonName, -1);
::X509_NAME_ENTRY* ne = ::X509_NAME_get_entry(name, loc);
if (!ne) {
::X509_free(cert);
return ("");
}
unsigned char* buf = 0;
int len = ::ASN1_STRING_to_UTF8(&buf, ::X509_NAME_ENTRY_get_data(ne));
if (len < 0) {
::X509_free(cert);
return ("");
}
std::string ret(reinterpret_cast<char*>(buf), static_cast<size_t>(len));
::OPENSSL_free(buf);
::X509_free(cert);
return (ret);
}
};
// Stream truncated error code.
#ifdef HAVE_STREAM_TRUNCATED_ERROR
const int STREAM_TRUNCATED = boost::asio::ssl::error::stream_truncated;
#else
const int STREAM_TRUNCATED = ERR_PACK(ERR_LIB_SSL, 0, SSL_R_SHORT_READ);
#endif
} // namespace asiolink
} // namespace isc
#endif // WITH_OPENSSL
#endif // OPENSSL_TLS_H
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