1 /* 2 * Copyright 2018 The WebRTC Project Authors. All rights reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef RTC_BASE_OPENSSL_SESSION_CACHE_H_ 12 #define RTC_BASE_OPENSSL_SESSION_CACHE_H_ 13 14 #include <openssl/ossl_typ.h> 15 16 #include <map> 17 #include <string> 18 19 #include "rtc_base/constructor_magic.h" 20 #include "rtc_base/ssl_stream_adapter.h" 21 22 #ifndef OPENSSL_IS_BORINGSSL 23 typedef struct ssl_session_st SSL_SESSION; 24 #endif 25 26 namespace rtc { 27 28 // The OpenSSLSessionCache maps hostnames to SSL_SESSIONS. This cache is 29 // owned by the OpenSSLAdapterFactory and is passed down to each OpenSSLAdapter 30 // created with the factory. 31 class OpenSSLSessionCache final { 32 public: 33 // Creates a new OpenSSLSessionCache using the provided the SSL_CTX and 34 // the ssl_mode. The SSL_CTX will be up_refed. ssl_ctx cannot be nullptr, 35 // the constructor immediately dchecks this. 36 OpenSSLSessionCache(SSLMode ssl_mode, SSL_CTX* ssl_ctx); 37 // Frees the cached SSL_SESSIONS and then frees the SSL_CTX. 38 ~OpenSSLSessionCache(); 39 // Looks up a session by hostname. The returned SSL_SESSION is not up_refed. 40 SSL_SESSION* LookupSession(const std::string& hostname) const; 41 // Adds a session to the cache, and up_refs it. Any existing session with the 42 // same hostname is replaced. 43 void AddSession(const std::string& hostname, SSL_SESSION* session); 44 // Returns the true underlying SSL Context that holds these cached sessions. 45 SSL_CTX* GetSSLContext() const; 46 // The SSL Mode tht the OpenSSLSessionCache was constructed with. This cannot 47 // be changed after launch. 48 SSLMode GetSSLMode() const; 49 50 private: 51 // Holds the SSL Mode that the OpenSSLCache was initialized with. This is 52 // immutable after creation and cannot change. 53 const SSLMode ssl_mode_; 54 /// SSL Context for all shared cached sessions. This SSL_CTX is initialized 55 // with SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_CLIENT); Meaning 56 // all client sessions will be added to the cache internal to the context. 57 SSL_CTX* ssl_ctx_ = nullptr; 58 // Map of hostnames to SSL_SESSIONs; holds references to the SSL_SESSIONs, 59 // which are cleaned up when the factory is destroyed. 60 // TODO(juberti): Add LRU eviction to keep the cache from growing forever. 61 std::map<std::string, SSL_SESSION*> sessions_; 62 // The cache should never be copied or assigned directly. 63 RTC_DISALLOW_COPY_AND_ASSIGN(OpenSSLSessionCache); 64 }; 65 66 } // namespace rtc 67 68 #endif // RTC_BASE_OPENSSL_SESSION_CACHE_H_ 69