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/*
* Copyright 2018 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef RTC_BASE_OPENSSL_SESSION_CACHE_H_
#define RTC_BASE_OPENSSL_SESSION_CACHE_H_
#include <openssl/ossl_typ.h>
#include <map>
#include <string>
#include "absl/strings/string_view.h"
#include "rtc_base/ssl_stream_adapter.h"
#include "rtc_base/string_utils.h"
#ifndef OPENSSL_IS_BORINGSSL
typedef struct ssl_session_st SSL_SESSION;
#endif
namespace rtc {
// The OpenSSLSessionCache maps hostnames to SSL_SESSIONS. This cache is
// owned by the OpenSSLAdapterFactory and is passed down to each OpenSSLAdapter
// created with the factory.
class OpenSSLSessionCache final {
public:
// Creates a new OpenSSLSessionCache using the provided the SSL_CTX and
// the ssl_mode. The SSL_CTX will be up_refed. ssl_ctx cannot be nullptr,
// the constructor immediately dchecks this.
OpenSSLSessionCache(SSLMode ssl_mode, SSL_CTX* ssl_ctx);
// Frees the cached SSL_SESSIONS and then frees the SSL_CTX.
~OpenSSLSessionCache();
OpenSSLSessionCache(const OpenSSLSessionCache&) = delete;
OpenSSLSessionCache& operator=(const OpenSSLSessionCache&) = delete;
// Looks up a session by hostname. The returned SSL_SESSION is not up_refed.
SSL_SESSION* LookupSession(absl::string_view hostname) const;
// Adds a session to the cache, and up_refs it. Any existing session with the
// same hostname is replaced.
void AddSession(absl::string_view hostname, SSL_SESSION* session);
// Returns the true underlying SSL Context that holds these cached sessions.
SSL_CTX* GetSSLContext() const;
// The SSL Mode tht the OpenSSLSessionCache was constructed with. This cannot
// be changed after launch.
SSLMode GetSSLMode() const;
private:
// Holds the SSL Mode that the OpenSSLCache was initialized with. This is
// immutable after creation and cannot change.
const SSLMode ssl_mode_;
/// SSL Context for all shared cached sessions. This SSL_CTX is initialized
// with SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_CLIENT); Meaning
// all client sessions will be added to the cache internal to the context.
SSL_CTX* ssl_ctx_ = nullptr;
// Map of hostnames to SSL_SESSIONs; holds references to the SSL_SESSIONs,
// which are cleaned up when the factory is destroyed.
// TODO(juberti): Add LRU eviction to keep the cache from growing forever.
std::map<std::string, SSL_SESSION*, rtc::AbslStringViewCmp> sessions_;
// The cache should never be copied or assigned directly.
};
} // namespace rtc
#endif // RTC_BASE_OPENSSL_SESSION_CACHE_H_
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