common_tls.h

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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 COMMON_TLS_H
#define COMMON_TLS_H


// Verify that this file was not directly included.
#ifndef CRYPTO_TLS_H
#error crypto_tls.h must be included in place of common_tls.h
#endif

#include <cryptolink/cryptolink.h>

#include <boost/noncopyable.hpp>
#include <boost/shared_ptr.hpp>

#include <netinet/in.h>
#include <sys/socket.h>

namespace isc {
namespace asiolink {

enum TlsRole { CLIENT, SERVER };

class TlsContext;

typedef boost::shared_ptr<TlsContext> TlsContextPtr;

class TlsContextBase : private boost::noncopyable {
public:
    virtual ~TlsContextBase() { }

    explicit TlsContextBase(TlsRole role) : role_(role) { }

    TlsRole getRole() const {
        return (role_);
    }


    static void configure(TlsContextPtr& context,
                          TlsRole role,
                          const std::string& ca_file,
                          const std::string& cert_file,
                          const std::string& key_file,
                          bool cert_required = true);

    virtual bool getCertRequired() const = 0;

protected:
    virtual void setCertRequired(bool cert_required) = 0;

    virtual void loadCaFile(const std::string& ca_file) = 0;

    virtual void loadCaPath(const std::string& ca_path) = 0;

    virtual void loadCertFile(const std::string& cert_file) = 0;

    virtual void loadKeyFile(const std::string& key_file) = 0;

public:
    TlsRole role_;
};

template <typename Callback, typename TlsStreamImpl>
class TlsStreamBase : public TlsStreamImpl {
public:

    TlsStreamBase(IOService& service, TlsContextPtr context);

    virtual ~TlsStreamBase() { }

    TlsRole getRole() const {
        return (role_);
    }

    virtual void handshake(Callback& callback) = 0;

    virtual void shutdown(Callback& callback) = 0;

    virtual std::string getSubject() = 0;

    virtual std::string getIssuer() = 0;

    TlsRole role_;
};

} // namespace asiolink
} // namespace isc

#endif // COMMON_TLS_H