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// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/quic/quic_client_session_cache.h"
#include "base/run_loop.h"
#include "base/test/simple_test_clock.h"
#include "base/test/task_environment.h"
#include "base/time/time.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/boringssl/src/include/openssl/ssl.h"
namespace net {
namespace {
std::unique_ptr<base::SimpleTestClock> MakeTestClock() {
std::unique_ptr<base::SimpleTestClock> clock =
std::make_unique<base::SimpleTestClock>();
// SimpleTestClock starts at the null base::Time which converts to and from
// time_t confusingly.
clock->SetNow(base::Time::FromTimeT(1000000000));
return clock;
}
class QuicClientSessionCacheTest : public testing::Test {
public:
QuicClientSessionCacheTest() : ssl_ctx_(SSL_CTX_new(TLS_method())) {}
protected:
bssl::UniquePtr<SSL_SESSION> NewSSLSession() {
SSL_SESSION* session = SSL_SESSION_new(ssl_ctx_.get());
if (!SSL_SESSION_set_protocol_version(session, TLS1_3_VERSION))
return nullptr;
return bssl::UniquePtr<SSL_SESSION>(session);
}
bssl::UniquePtr<SSL_SESSION> MakeTestSession(base::Time now,
base::TimeDelta timeout) {
bssl::UniquePtr<SSL_SESSION> session = NewSSLSession();
SSL_SESSION_set_time(session.get(), now.ToTimeT());
SSL_SESSION_set_timeout(session.get(), timeout.InSeconds());
return session;
}
bssl::UniquePtr<SSL_CTX> ssl_ctx_;
};
} // namespace
// Tests that simple insertion and lookup work correctly.
TEST_F(QuicClientSessionCacheTest, Basic) {
QuicClientSessionCache cache;
std::unique_ptr<quic::QuicResumptionState> state1 =
std::make_unique<quic::QuicResumptionState>();
state1->application_state.push_back('a');
state1->tls_session = NewSSLSession();
quic::QuicServerId id1("a.com", 443);
std::unique_ptr<quic::QuicResumptionState> state2 =
std::make_unique<quic::QuicResumptionState>();
state2->application_state.push_back('b');
state2->tls_session = NewSSLSession();
quic::QuicServerId id2("b.com", 443);
EXPECT_EQ(nullptr, cache.Lookup(id1, ssl_ctx_.get()));
EXPECT_EQ(nullptr, cache.Lookup(id2, ssl_ctx_.get()));
EXPECT_EQ(0u, cache.size());
cache.Insert(id1, std::move(state1));
EXPECT_EQ(1u, cache.size());
EXPECT_EQ('a', cache.Lookup(id1, ssl_ctx_.get())->application_state.front());
EXPECT_EQ(nullptr, cache.Lookup(id2, ssl_ctx_.get()));
std::unique_ptr<quic::QuicResumptionState> state3 =
std::make_unique<quic::QuicResumptionState>();
state3->application_state.push_back('c');
state3->tls_session = NewSSLSession();
quic::QuicServerId id3("c.com", 443);
cache.Insert(id3, std::move(state3));
cache.Insert(id2, std::move(state2));
EXPECT_EQ(2u, cache.size());
EXPECT_EQ('b', cache.Lookup(id2, ssl_ctx_.get())->application_state.front());
EXPECT_EQ('c', cache.Lookup(id3, ssl_ctx_.get())->application_state.front());
// Verify that the cache is cleared after Lookups.
EXPECT_EQ(nullptr, cache.Lookup(id1, ssl_ctx_.get()));
EXPECT_EQ(nullptr, cache.Lookup(id2, ssl_ctx_.get()));
EXPECT_EQ(nullptr, cache.Lookup(id3, ssl_ctx_.get()));
EXPECT_EQ(0u, cache.size());
}
// When the size limit is exceeded, the oldest entry should be erased.
TEST_F(QuicClientSessionCacheTest, SizeLimit) {
QuicClientSessionCache cache(2);
std::unique_ptr<quic::QuicResumptionState> state1 =
std::make_unique<quic::QuicResumptionState>();
state1->application_state.push_back('a');
state1->tls_session = NewSSLSession();
quic::QuicServerId id1("a.com", 443);
std::unique_ptr<quic::QuicResumptionState> state2 =
std::make_unique<quic::QuicResumptionState>();
state2->application_state.push_back('b');
state2->tls_session = NewSSLSession();
quic::QuicServerId id2("b.com", 443);
std::unique_ptr<quic::QuicResumptionState> state3 =
std::make_unique<quic::QuicResumptionState>();
state3->application_state.push_back('c');
state3->tls_session = NewSSLSession();
quic::QuicServerId id3("c.com", 443);
cache.Insert(id1, std::move(state1));
cache.Insert(id2, std::move(state2));
cache.Insert(id3, std::move(state3));
EXPECT_EQ(2u, cache.size());
EXPECT_EQ('b', cache.Lookup(id2, ssl_ctx_.get())->application_state.front());
EXPECT_EQ('c', cache.Lookup(id3, ssl_ctx_.get())->application_state.front());
EXPECT_EQ(nullptr, cache.Lookup(id1, ssl_ctx_.get()));
}
// Expired session isn't considered valid and nullptr will be returned upon
// Lookup.
TEST_F(QuicClientSessionCacheTest, Expiration) {
const base::TimeDelta kTimeout = base::TimeDelta::FromSeconds(1000);
QuicClientSessionCache cache;
std::unique_ptr<base::SimpleTestClock> clock = MakeTestClock();
cache.SetClockForTesting(clock.get());
std::unique_ptr<quic::QuicResumptionState> state1 =
std::make_unique<quic::QuicResumptionState>();
state1->tls_session = MakeTestSession(clock->Now(), kTimeout);
quic::QuicServerId id1("a.com", 443);
std::unique_ptr<quic::QuicResumptionState> state2 =
std::make_unique<quic::QuicResumptionState>();
state2->tls_session = MakeTestSession(clock->Now(), 3 * kTimeout);
;
state2->application_state.push_back('b');
quic::QuicServerId id2("b.com", 443);
cache.Insert(id1, std::move(state1));
cache.Insert(id2, std::move(state2));
EXPECT_EQ(2u, cache.size());
// Expire the session.
clock->Advance(kTimeout * 2);
// The entry has not been removed yet.
EXPECT_EQ(2u, cache.size());
EXPECT_EQ(nullptr, cache.Lookup(id1, ssl_ctx_.get()));
EXPECT_EQ(1u, cache.size());
EXPECT_EQ('b', cache.Lookup(id2, ssl_ctx_.get())->application_state.front());
EXPECT_EQ(0u, cache.size());
}
TEST_F(QuicClientSessionCacheTest, FlushOnMemoryNotifications) {
base::test::TaskEnvironment task_environment;
const base::TimeDelta kTimeout = base::TimeDelta::FromSeconds(1000);
QuicClientSessionCache cache;
std::unique_ptr<base::SimpleTestClock> clock = MakeTestClock();
cache.SetClockForTesting(clock.get());
std::unique_ptr<quic::QuicResumptionState> state1 =
std::make_unique<quic::QuicResumptionState>();
state1->tls_session = MakeTestSession(clock->Now(), kTimeout);
quic::QuicServerId id1("a.com", 443);
std::unique_ptr<quic::QuicResumptionState> state2 =
std::make_unique<quic::QuicResumptionState>();
state2->tls_session = MakeTestSession(clock->Now(), 3 * kTimeout);
;
state2->application_state.push_back('b');
quic::QuicServerId id2("b.com", 443);
cache.Insert(id1, std::move(state1));
cache.Insert(id2, std::move(state2));
EXPECT_EQ(2u, cache.size());
// Expire the session.
clock->Advance(kTimeout * 2);
// The entry has not been removed yet.
EXPECT_EQ(2u, cache.size());
// Fire a notification that will flush expired sessions.
base::MemoryPressureListener::NotifyMemoryPressure(
base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE);
base::RunLoop().RunUntilIdle();
// session1 is expired and should be flushed.
EXPECT_EQ(nullptr, cache.Lookup(id1, ssl_ctx_.get()));
EXPECT_EQ(1u, cache.size());
// Fire notification that will flush everything.
base::MemoryPressureListener::NotifyMemoryPressure(
base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL);
base::RunLoop().RunUntilIdle();
EXPECT_EQ(0u, cache.size());
}
} // namespace net
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