Mike Yu | bab3daa | 2018-10-19 22:11:43 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2018 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #ifndef _DNS_DNSTLSSESSIONCACHE_H |
| 18 | #define _DNS_DNSTLSSESSIONCACHE_H |
| 19 | |
| 20 | #include <deque> |
| 21 | #include <mutex> |
| 22 | |
| 23 | #include <openssl/ssl.h> |
| 24 | |
| 25 | #include <android-base/thread_annotations.h> |
Mike Yu | bab3daa | 2018-10-19 22:11:43 +0800 | [diff] [blame] | 26 | |
| 27 | namespace android { |
| 28 | namespace net { |
| 29 | |
| 30 | // Cache of recently seen SSL_SESSIONs. This is used to support session tickets. |
| 31 | // This class is thread-safe. |
| 32 | class DnsTlsSessionCache { |
Bernie Innocenti | ec4219b | 2019-01-30 11:16:36 +0900 | [diff] [blame] | 33 | public: |
Mike Yu | bab3daa | 2018-10-19 22:11:43 +0800 | [diff] [blame] | 34 | // Prepare SSL objects to use this session cache. These methods must be called |
| 35 | // before making use of either object. |
| 36 | void prepareSslContext(SSL_CTX* _Nonnull ssl_ctx); |
| 37 | bool prepareSsl(SSL* _Nonnull ssl); |
| 38 | |
| 39 | // Get the most recently discovered session. For TLS 1.3 compatibility and |
| 40 | // maximum privacy, each session will only be returned once, so the caller |
| 41 | // gains ownership of the session. (Here and throughout, |
| 42 | // bssl::UniquePtr<SSL_SESSION> is actually serving as a reference counted |
| 43 | // pointer.) |
| 44 | bssl::UniquePtr<SSL_SESSION> getSession() EXCLUDES(mLock); |
| 45 | |
Bernie Innocenti | ec4219b | 2019-01-30 11:16:36 +0900 | [diff] [blame] | 46 | private: |
Mike Yu | bab3daa | 2018-10-19 22:11:43 +0800 | [diff] [blame] | 47 | static constexpr size_t kMaxSize = 5; |
| 48 | static int newSessionCallback(SSL* _Nullable ssl, SSL_SESSION* _Nullable session); |
| 49 | |
| 50 | std::mutex mLock; |
| 51 | void recordSession(SSL_SESSION* _Nullable session) EXCLUDES(mLock); |
| 52 | |
| 53 | // Queue of sessions, from least recently added to most recently. |
| 54 | std::deque<bssl::UniquePtr<SSL_SESSION>> mSessions GUARDED_BY(mLock); |
| 55 | }; |
| 56 | |
| 57 | } // end of namespace net |
| 58 | } // end of namespace android |
| 59 | |
| 60 | #endif // _DNS_DNSTLSSESSIONCACHE_H |