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// Copyright (C) 2021 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 BOTAN_BOOST_TLS_H
#define BOTAN_BOOST_TLS_H
/// @file botan_boost_tls.h Botan boost ASIO implementation of the TLS API.
#if defined(WITH_BOTAN) && defined(WITH_BOTAN_BOOST)
#include <asiolink/asio_wrapper.h>
#include <asiolink/io_asio_socket.h>
#include <asiolink/io_service.h>
#include <asiolink/common_tls.h>
#include <exceptions/exceptions.h>
#include <asiolink/botan_boost_wrapper.h>
#include <botan/asio_stream.h>
namespace isc {
namespace asiolink {
/// @brief Translate TLS role into implementation.
inline Botan::TLS::Connection_Side roleToImpl(TlsRole role) {
if (role == TlsRole::SERVER) {
return (Botan::TLS::Connection_Side::SERVER);
} else {
return (Botan::TLS::Connection_Side::CLIENT);
}
}
/// @brief Forward declaration of Botan TLS context.
class TlsContextImpl;
/// @brief Botan boost ASIO TLS context.
class TlsContext : public TlsContextBase {
public:
/// @brief Destructor.
///
/// @note The destructor can't be defined here because a unique
/// pointer to an incomplete type is used.
virtual ~TlsContext();
/// @brief Create a fresh context.
///
/// @param role The TLS role client or server.
explicit TlsContext(TlsRole role);
/// @brief Return the underlying context.
Botan::TLS::Context& getContext();
/// @brief Get the peer certificate requirement mode.
///
/// @return True if peer certificates are required, false if they
/// are optional.
virtual bool getCertRequired() const;
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 Botan TLS context.
std::unique_ptr<TlsContextImpl> impl_;
/// @brief Allow access to protected methods by the base class.
friend class TlsContextBase;
};
/// @brief The type of underlying TLS streams.
typedef Botan::TLS::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 Botan boost ASIO 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 Clear the TLS object.
///
/// @note The idea to reuse a TCP connection for a fresh TLS is at
/// least arguable. Currently it does nothing so the socket is
/// **not** reusable.
virtual void clear() {
}
/// @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() {
const std::vector<Botan::X509_Certificate>& cert_chain =
Base::native_handle()->peer_cert_chain();
if (cert_chain.empty()) {
return ("");
}
const Botan::X509_DN& subject = cert_chain[0].subject_dn();
return (subject.get_first_attribute("CommonName"));
}
/// @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() {
const std::vector<Botan::X509_Certificate>& cert_chain =
Base::native_handle()->peer_cert_chain();
if (cert_chain.empty()) {
return ("");
}
const Botan::X509_DN& issuer = cert_chain[0].issuer_dn();
return (issuer.get_first_attribute("CommonName"));
}
};
// Stream truncated error code.
const int STREAM_TRUNCATED = Botan::TLS::StreamError::StreamTruncated;
} // namespace asiolink
} // namespace isc
#endif // WITH_BOTAN && WITH_BOTAN_BOOST
#endif // BOTAN_BOOST_TLS_H
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