ssl_session.h

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/*
 *
 * Copyright 2018 gRPC authors.
 *
 * Licensed 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 GRPC_CORE_TSI_SSL_SESSION_CACHE_SSL_SESSION_H
#define GRPC_CORE_TSI_SSL_SESSION_CACHE_SSL_SESSION_H
 
#include <grpc/support/port_platform.h>
 
#include <memory>
 
#include <openssl/ssl.h>
 
#include <grpc/slice.h>
 
#include "src/core/lib/gprpp/ref_counted.h"
 
// The main purpose of code here is to provide means to cache SSL sessions
// in a way that they can be shared between connections.
//
// SSL_SESSION stands for single instance of session and is not generally safe
// to share between SSL contexts with different lifetimes. It happens because
// not all SSL implementations guarantee immutability of SSL_SESSION object.
// See SSL_SESSION documentation in BoringSSL and OpenSSL for more details.
 
namespace tsi {
 
struct SslSessionDeleter {
  void operator()(SSL_SESSION* session) { SSL_SESSION_free(session); }
};
 
typedef std::unique_ptr<SSL_SESSION, SslSessionDeleter> SslSessionPtr;
 
class SslCachedSession {
 public:
  // Not copyable nor movable.
  SslCachedSession(const SslCachedSession&) = delete;
  SslCachedSession& operator=(const SslCachedSession&) = delete;
 
  static std::unique_ptr<SslCachedSession> Create(SslSessionPtr session);
 
  virtual ~SslCachedSession() = default;
 
  virtual SslSessionPtr CopySession() const = 0;
 
 protected:
  SslCachedSession() = default;
};
 
}  // namespace tsi
 
#endif /* GRPC_CORE_TSI_SSL_SESSION_CACHE_SSL_SESSION_H */