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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,175 @@ | ||
| // SPDX-License-Identifier: GPL-2.0 | ||
| /* Copyright (c) 2024 Chilledheart */ | ||
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| #ifdef UNSAFE_BUFFERS_BUILD | ||
| // TODO(crbug.com/40284755): Remove this and spanify to fix the errors. | ||
| #pragma allow_unsafe_buffers | ||
| #endif | ||
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| #include "net/ssl_client_session_cache.hpp" | ||
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| #include <tuple> | ||
| #include <utility> | ||
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| #include <absl/time/clock.h> | ||
| #include "third_party/boringssl/src/include/openssl/ssl.h" | ||
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| namespace net { | ||
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| namespace { | ||
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| // Returns a tuple of references to fields of |key|, for comparison purposes. | ||
| auto TieKeyFields(const SSLClientSessionCache::Key& key) { | ||
| return std::tie(key.server, key.dest_ip_addr); | ||
| } | ||
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| } // namespace | ||
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| SSLClientSessionCache::Key::Key() = default; | ||
| SSLClientSessionCache::Key::Key(const Key& other) = default; | ||
| SSLClientSessionCache::Key::Key(Key&& other) = default; | ||
| SSLClientSessionCache::Key::~Key() = default; | ||
| SSLClientSessionCache::Key& SSLClientSessionCache::Key::operator=(const Key& other) = default; | ||
| SSLClientSessionCache::Key& SSLClientSessionCache::Key::operator=(Key&& other) = default; | ||
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| bool SSLClientSessionCache::Key::operator==(const Key& other) const { | ||
| return TieKeyFields(*this) == TieKeyFields(other); | ||
| } | ||
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| bool SSLClientSessionCache::Key::operator<(const Key& other) const { | ||
| return TieKeyFields(*this) < TieKeyFields(other); | ||
| } | ||
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| SSLClientSessionCache::SSLClientSessionCache(const Config& config) : config_(config), cache_(config.max_entries) {} | ||
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| SSLClientSessionCache::~SSLClientSessionCache() { | ||
| Flush(); | ||
| } | ||
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| size_t SSLClientSessionCache::size() const { | ||
| return cache_.size(); | ||
| } | ||
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| bssl::UniquePtr<SSL_SESSION> SSLClientSessionCache::Lookup(const Key& cache_key) { | ||
| // Expire stale sessions. | ||
| lookups_since_flush_++; | ||
| if (lookups_since_flush_ >= config_.expiration_check_count) { | ||
| lookups_since_flush_ = 0; | ||
| FlushExpiredSessions(); | ||
| } | ||
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| auto iter = cache_.Get(cache_key); | ||
| if (iter == cache_.end()) | ||
| return nullptr; | ||
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| time_t now = absl::ToTimeT(absl::Now()); | ||
| bssl::UniquePtr<SSL_SESSION> session = iter->second.Pop(); | ||
| if (iter->second.ExpireSessions(now)) | ||
| cache_.Erase(iter); | ||
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| if (IsExpired(session.get(), now)) | ||
| session = nullptr; | ||
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| return session; | ||
| } | ||
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| void SSLClientSessionCache::Insert(const Key& cache_key, bssl::UniquePtr<SSL_SESSION> session) { | ||
| auto iter = cache_.Get(cache_key); | ||
| if (iter == cache_.end()) | ||
| iter = cache_.Put(cache_key, Entry()); | ||
| iter->second.Push(std::move(session)); | ||
| } | ||
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| void SSLClientSessionCache::ClearEarlyData(const Key& cache_key) { | ||
| auto iter = cache_.Get(cache_key); | ||
| if (iter != cache_.end()) { | ||
| for (auto& session : iter->second.sessions) { | ||
| if (session) { | ||
| session.reset(SSL_SESSION_copy_without_early_data(session.get())); | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| void SSLClientSessionCache::Flush() { | ||
| cache_.Clear(); | ||
| } | ||
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| bool SSLClientSessionCache::IsExpired(SSL_SESSION* session, time_t now) { | ||
| if (now < 0) | ||
| return true; | ||
| uint64_t now_u64 = static_cast<uint64_t>(now); | ||
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| // now_u64 may be slightly behind because of differences in how | ||
| // time is calculated at this layer versus BoringSSL. | ||
| // Add a second of wiggle room to account for this. | ||
| return now_u64 < SSL_SESSION_get_time(session) - 1 || | ||
| now_u64 >= SSL_SESSION_get_time(session) + SSL_SESSION_get_timeout(session); | ||
| } | ||
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| SSLClientSessionCache::Entry::Entry() = default; | ||
| SSLClientSessionCache::Entry::Entry(Entry&&) = default; | ||
| SSLClientSessionCache::Entry::~Entry() = default; | ||
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| void SSLClientSessionCache::Entry::Push(bssl::UniquePtr<SSL_SESSION> session) { | ||
| if (sessions[0] != nullptr && SSL_SESSION_should_be_single_use(sessions[0].get())) { | ||
| sessions[1] = std::move(sessions[0]); | ||
| } | ||
| sessions[0] = std::move(session); | ||
| } | ||
|
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| bssl::UniquePtr<SSL_SESSION> SSLClientSessionCache::Entry::Pop() { | ||
| if (sessions[0] == nullptr) | ||
| return nullptr; | ||
| bssl::UniquePtr<SSL_SESSION> session = bssl::UpRef(sessions[0]); | ||
| if (SSL_SESSION_should_be_single_use(session.get())) { | ||
| sessions[0] = std::move(sessions[1]); | ||
| sessions[1] = nullptr; | ||
| } | ||
| return session; | ||
| } | ||
|
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| bool SSLClientSessionCache::Entry::ExpireSessions(time_t now) { | ||
| if (sessions[0] == nullptr) | ||
| return true; | ||
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| if (SSLClientSessionCache::IsExpired(sessions[0].get(), now)) { | ||
| return true; | ||
| } | ||
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| if (sessions[1] != nullptr && SSLClientSessionCache::IsExpired(sessions[1].get(), now)) { | ||
| sessions[1] = nullptr; | ||
| } | ||
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| return false; | ||
| } | ||
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| void SSLClientSessionCache::FlushExpiredSessions() { | ||
| time_t now = absl::ToTimeT(absl::Now()); | ||
| auto iter = cache_.begin(); | ||
| while (iter != cache_.end()) { | ||
| if (iter->second.ExpireSessions(now)) { | ||
| iter = cache_.Erase(iter); | ||
| } else { | ||
| ++iter; | ||
| } | ||
| } | ||
| } | ||
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| #if 0 | ||
| void SSLClientSessionCache::OnMemoryPressure( | ||
| base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level) { | ||
| switch (memory_pressure_level) { | ||
| case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE: | ||
| break; | ||
| case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE: | ||
| FlushExpiredSessions(); | ||
| break; | ||
| case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL: | ||
| Flush(); | ||
| break; | ||
| } | ||
| } | ||
| #endif | ||
|
|
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| } // namespace net |
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