src/ssl.hpp

/*
  Licensed to the Apache Software Foundation (ASF) under one
  or more contributor license agreements.  See the NOTICE file
  distributed with this work for additional information
  regarding copyright ownership.  The ASF licenses this file
  to you under the Apache License, Version 2.0 (the
  "License"); you may not use this file except in compliance
  with the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/

#ifndef DATASTAX_INTERNAL_SSL_HPP
#define DATASTAX_INTERNAL_SSL_HPP

#include "address.hpp"
#include "allocated.hpp"
#include "cassandra.h"
#include "driver_config.hpp"
#include "external.hpp"
#include "ref_counted.hpp"
#include "ring_buffer.hpp"
#include "string.hpp"

#include <uv.h>

namespace datastax { namespace internal { namespace core {

class SslSession : public Allocated {
public:
  SslSession(const Address& address, const String& hostname, const String& sni_server_name,
             int flags)
      : address_(address)
      , hostname_(hostname)
      , sni_server_name_(sni_server_name)
      , verify_flags_(flags)
      , error_code_(CASS_OK) {}

  virtual ~SslSession() {}

  bool has_error() const { return error_code() != CASS_OK; }

  CassError error_code() const { return error_code_; }

  String error_message() const { return error_message_; }

  virtual bool is_handshake_done() const = 0;
  virtual void do_handshake() = 0;
  virtual void verify() = 0;

  virtual int encrypt(const char* data, size_t data_size) = 0;
  virtual int decrypt(char* data, size_t data_size) = 0;

  rb::RingBuffer& incoming() { return incoming_; }
  rb::RingBuffer& outgoing() { return outgoing_; }

protected:
  Address address_;
  String hostname_;
  String sni_server_name_;
  int verify_flags_;
  rb::RingBuffer incoming_;
  rb::RingBuffer outgoing_;
  CassError error_code_;
  String error_message_;
};

class SslContext : public RefCounted<SslContext> {
public:
  typedef SharedRefPtr<SslContext> Ptr;

  SslContext()
      : verify_flags_(CASS_SSL_VERIFY_PEER_CERT) {}

  virtual ~SslContext() {}

  void set_verify_flags(int flags) { verify_flags_ = flags; }
  bool is_cert_validation_enabled() { return verify_flags_ != CASS_SSL_VERIFY_NONE; }

  virtual SslSession* create_session(const Address& address, const String& hostname,
                                     const String& sni_server_name) = 0;
  virtual CassError add_trusted_cert(const char* cert, size_t cert_length) = 0;
  virtual CassError set_cert(const char* cert, size_t cert_length) = 0;
  virtual CassError set_private_key(const char* key, size_t key_length, const char* password,
                                    size_t password_length) = 0;
  virtual CassError set_min_protocol_version(CassSslTlsVersion min_version) = 0;

protected:
  int verify_flags_;
};

template <class T>
class SslContextFactoryBase {
public:
  static SslContext::Ptr create();
  static void init_once();
  static void thread_cleanup();

  static void init();    // Tests only
  static void cleanup(); // Tests only

private:
  static uv_once_t ssl_init_guard;
};

template <class T>
SslContext::Ptr SslContextFactoryBase<T>::create() {
  return T::create();
}

template <class T>
void SslContextFactoryBase<T>::init_once() {
  uv_once(&ssl_init_guard, T::init);
}

template <class T>
void SslContextFactoryBase<T>::thread_cleanup() {
  T::internal_thread_cleanup();
}

template <class T>
void SslContextFactoryBase<T>::init() {
  T::internal_init();
}

template <class T>
void SslContextFactoryBase<T>::cleanup() {
  T::internal_cleanup();
}

}}} // namespace datastax::internal::core

#ifdef HAVE_OPENSSL
#include "ssl/ssl_openssl_impl.hpp"
#else
#include "ssl/ssl_no_impl.hpp"
#endif

EXTERNAL_TYPE(datastax::internal::core::SslContext, CassSsl)

#endif