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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 <grpc/slice.h>
extern "C" {
#include <openssl/ssl.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;
/// SslCachedSession is an immutable thread-safe storage for single session
/// representation. It provides means to share SSL session data (e.g. TLS
/// ticket) between encrypted connections regardless of SSL context lifetime.
class SslCachedSession {
public:
// Not copyable nor movable.
SslCachedSession(const SslCachedSession&) = delete;
SslCachedSession& operator=(const SslCachedSession&) = delete;
/// Create single cached instance of \a session.
static grpc_core::UniquePtr<SslCachedSession> Create(SslSessionPtr session);
virtual ~SslCachedSession() = default;
/// Returns a copy of previously cached session.
virtual SslSessionPtr CopySession() const GRPC_ABSTRACT;
GRPC_ABSTRACT_BASE_CLASS
protected:
SslCachedSession() = default;
};
} // namespace tsi
#endif /* GRPC_CORE_TSI_SSL_SESSION_CACHE_SSL_SESSION_H */
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