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// Copyright (c) 2017 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/third_party/quiche/src/quic/quartc/quartc_session.h"
#include "net/third_party/quiche/src/quic/core/quic_simple_buffer_allocator.h"
#include "net/third_party/quiche/src/quic/core/quic_types.h"
#include "net/third_party/quiche/src/quic/core/tls_client_handshaker.h"
#include "net/third_party/quiche/src/quic/core/tls_server_handshaker.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_clock.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_ptr_util.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_string_utils.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_test.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_test_mem_slice_vector.h"
#include "net/third_party/quiche/src/quic/quartc/counting_packet_filter.h"
#include "net/third_party/quiche/src/quic/quartc/quartc_endpoint.h"
#include "net/third_party/quiche/src/quic/quartc/quartc_fakes.h"
#include "net/third_party/quiche/src/quic/quartc/quartc_packet_writer.h"
#include "net/third_party/quiche/src/quic/quartc/simulated_packet_transport.h"
#include "net/third_party/quiche/src/quic/test_tools/mock_clock.h"
#include "net/third_party/quiche/src/quic/test_tools/simulator/packet_filter.h"
#include "net/third_party/quiche/src/quic/test_tools/simulator/simulator.h"
namespace quic {
namespace {
constexpr QuicTime::Delta kPropagationDelay =
QuicTime::Delta::FromMilliseconds(10);
// Propagation delay and a bit, but no more than full RTT.
constexpr QuicTime::Delta kPropagationDelayAndABit =
QuicTime::Delta::FromMilliseconds(12);
static QuicByteCount kDefaultMaxPacketSize = 1200;
class QuartcSessionTest : public QuicTest {
public:
~QuartcSessionTest() override {}
void Init(bool create_client_endpoint = true) {
client_transport_ =
QuicMakeUnique<simulator::SimulatedQuartcPacketTransport>(
&simulator_, "client_transport", "server_transport",
10 * kDefaultMaxPacketSize);
server_transport_ =
QuicMakeUnique<simulator::SimulatedQuartcPacketTransport>(
&simulator_, "server_transport", "client_transport",
10 * kDefaultMaxPacketSize);
client_filter_ = QuicMakeUnique<simulator::CountingPacketFilter>(
&simulator_, "client_filter", client_transport_.get());
client_server_link_ = QuicMakeUnique<simulator::SymmetricLink>(
client_filter_.get(), server_transport_.get(),
QuicBandwidth::FromKBitsPerSecond(10 * 1000), kPropagationDelay);
client_stream_delegate_ = QuicMakeUnique<FakeQuartcStreamDelegate>();
client_session_delegate_ = QuicMakeUnique<FakeQuartcSessionDelegate>(
client_stream_delegate_.get(), simulator_.GetClock());
client_endpoint_delegate_ = QuicMakeUnique<FakeQuartcEndpointDelegate>(
client_session_delegate_.get());
server_stream_delegate_ = QuicMakeUnique<FakeQuartcStreamDelegate>();
server_session_delegate_ = QuicMakeUnique<FakeQuartcSessionDelegate>(
server_stream_delegate_.get(), simulator_.GetClock());
server_endpoint_delegate_ = QuicMakeUnique<FakeQuartcEndpointDelegate>(
server_session_delegate_.get());
// No 0-rtt setup, because server config is empty.
// CannotCreateDataStreamBeforeHandshake depends on 1-rtt setup.
if (create_client_endpoint) {
client_endpoint_ = QuicMakeUnique<QuartcClientEndpoint>(
simulator_.GetAlarmFactory(), simulator_.GetClock(),
simulator_.GetRandomGenerator(), client_endpoint_delegate_.get(),
quic::QuartcSessionConfig(),
/*serialized_server_config=*/"");
}
server_endpoint_ = QuicMakeUnique<QuartcServerEndpoint>(
simulator_.GetAlarmFactory(), simulator_.GetClock(),
simulator_.GetRandomGenerator(), server_endpoint_delegate_.get(),
quic::QuartcSessionConfig());
}
// Note that input session config will apply to both server and client.
// Perspective and packet_transport will be overwritten.
void CreateClientAndServerSessions(const QuartcSessionConfig& session_config,
bool init = true) {
if (init) {
Init();
}
server_endpoint_->Connect(server_transport_.get());
client_endpoint_->Connect(client_transport_.get());
CHECK(simulator_.RunUntil([this] {
return client_endpoint_delegate_->session() != nullptr &&
server_endpoint_delegate_->session() != nullptr;
}));
client_peer_ = client_endpoint_delegate_->session();
server_peer_ = server_endpoint_delegate_->session();
}
// Runs all tasks scheduled in the next 200 ms.
void RunTasks() { simulator_.RunFor(QuicTime::Delta::FromMilliseconds(200)); }
void AwaitHandshake() {
simulator_.RunUntil([this] {
return client_peer_->IsCryptoHandshakeConfirmed() &&
server_peer_->IsCryptoHandshakeConfirmed();
});
}
// Test handshake establishment and sending/receiving of data for two
// directions.
void TestSendReceiveStreams() {
ASSERT_TRUE(server_peer_->IsCryptoHandshakeConfirmed());
ASSERT_TRUE(client_peer_->IsCryptoHandshakeConfirmed());
ASSERT_TRUE(server_peer_->IsEncryptionEstablished());
ASSERT_TRUE(client_peer_->IsEncryptionEstablished());
// Now we can establish encrypted outgoing stream.
QuartcStream* outgoing_stream =
server_peer_->CreateOutgoingBidirectionalStream();
QuicStreamId stream_id = outgoing_stream->id();
ASSERT_NE(nullptr, outgoing_stream);
EXPECT_TRUE(server_peer_->ShouldKeepConnectionAlive());
outgoing_stream->SetDelegate(server_stream_delegate_.get());
// Send a test message from peer 1 to peer 2.
char kTestMessage[] = "Hello";
test::QuicTestMemSliceVector data(
{std::make_pair(kTestMessage, strlen(kTestMessage))});
outgoing_stream->WriteMemSlices(data.span(), /*fin=*/false);
RunTasks();
// Wait for peer 2 to receive messages.
ASSERT_TRUE(client_stream_delegate_->has_data());
QuartcStream* incoming = client_session_delegate_->last_incoming_stream();
ASSERT_TRUE(incoming);
EXPECT_EQ(incoming->id(), stream_id);
EXPECT_TRUE(client_peer_->ShouldKeepConnectionAlive());
EXPECT_EQ(client_stream_delegate_->data()[stream_id], kTestMessage);
// Send a test message from peer 2 to peer 1.
char kTestResponse[] = "Response";
test::QuicTestMemSliceVector response(
{std::make_pair(kTestResponse, strlen(kTestResponse))});
incoming->WriteMemSlices(response.span(), /*fin=*/false);
RunTasks();
// Wait for peer 1 to receive messages.
ASSERT_TRUE(server_stream_delegate_->has_data());
EXPECT_EQ(server_stream_delegate_->data()[stream_id], kTestResponse);
}
// Test sending/receiving of messages for two directions.
void TestSendReceiveMessage() {
ASSERT_TRUE(server_peer_->CanSendMessage());
ASSERT_TRUE(client_peer_->CanSendMessage());
// Send message from peer 1 to peer 2.
ASSERT_TRUE(server_peer_->SendOrQueueMessage("Message from server"));
// First message in each direction should not be queued.
EXPECT_EQ(server_peer_->send_message_queue_size(), 0u);
// Wait for peer 2 to receive message.
RunTasks();
EXPECT_THAT(client_session_delegate_->incoming_messages(),
testing::ElementsAre("Message from server"));
// Send message from peer 2 to peer 1.
ASSERT_TRUE(client_peer_->SendOrQueueMessage("Message from client"));
// First message in each direction should not be queued.
EXPECT_EQ(client_peer_->send_message_queue_size(), 0u);
// Wait for peer 1 to receive message.
RunTasks();
EXPECT_THAT(server_session_delegate_->incoming_messages(),
testing::ElementsAre("Message from client"));
}
// Test for sending multiple messages that also result in queueing.
// This is one-way test, which is run in given direction.
void TestSendReceiveQueuedMessages(bool direction_from_server) {
// Send until queue_size number of messages are queued.
constexpr size_t queue_size = 10;
ASSERT_TRUE(server_peer_->CanSendMessage());
ASSERT_TRUE(client_peer_->CanSendMessage());
QuartcSession* const peer_sending =
direction_from_server ? server_peer_ : client_peer_;
FakeQuartcSessionDelegate* const delegate_receiving =
direction_from_server ? client_session_delegate_.get()
: server_session_delegate_.get();
// There should be no messages in the queue before we start sending.
EXPECT_EQ(peer_sending->send_message_queue_size(), 0u);
// Send messages from peer 1 to peer 2 until required number of messages
// are queued in unsent message queue.
std::vector<std::string> sent_messages;
while (peer_sending->send_message_queue_size() < queue_size) {
sent_messages.push_back(
QuicStrCat("Sending message, index=", sent_messages.size()));
ASSERT_TRUE(peer_sending->SendOrQueueMessage(sent_messages.back()));
}
// Wait for peer 2 to receive all messages.
RunTasks();
EXPECT_EQ(delegate_receiving->incoming_messages(), sent_messages);
}
// Test sending long messages:
// - message of maximum allowed length should succeed
// - message of > maximum allowed length should fail.
void TestSendLongMessage() {
ASSERT_TRUE(server_peer_->CanSendMessage());
ASSERT_TRUE(client_peer_->CanSendMessage());
// Send message of maximum allowed length.
std::string message_max_long =
std::string(server_peer_->GetCurrentLargestMessagePayload(), 'A');
ASSERT_TRUE(server_peer_->SendOrQueueMessage(message_max_long));
// Send long message which should fail.
std::string message_too_long =
std::string(server_peer_->GetCurrentLargestMessagePayload() + 1, 'B');
ASSERT_FALSE(server_peer_->SendOrQueueMessage(message_too_long));
// Wait for peer 2 to receive message.
RunTasks();
// Client should only receive one message of allowed length.
EXPECT_THAT(client_session_delegate_->incoming_messages(),
testing::ElementsAre(message_max_long));
}
// Test that client and server are not connected after handshake failure.
void TestDisconnectAfterFailedHandshake() {
EXPECT_TRUE(!client_session_delegate_->connected());
EXPECT_TRUE(!server_session_delegate_->connected());
EXPECT_FALSE(client_peer_->IsEncryptionEstablished());
EXPECT_FALSE(client_peer_->IsCryptoHandshakeConfirmed());
EXPECT_FALSE(server_peer_->IsEncryptionEstablished());
EXPECT_FALSE(server_peer_->IsCryptoHandshakeConfirmed());
}
protected:
simulator::Simulator simulator_;
std::unique_ptr<simulator::SimulatedQuartcPacketTransport> client_transport_;
std::unique_ptr<simulator::SimulatedQuartcPacketTransport> server_transport_;
std::unique_ptr<simulator::CountingPacketFilter> client_filter_;
std::unique_ptr<simulator::SymmetricLink> client_server_link_;
std::unique_ptr<FakeQuartcStreamDelegate> client_stream_delegate_;
std::unique_ptr<FakeQuartcSessionDelegate> client_session_delegate_;
std::unique_ptr<FakeQuartcEndpointDelegate> client_endpoint_delegate_;
std::unique_ptr<FakeQuartcStreamDelegate> server_stream_delegate_;
std::unique_ptr<FakeQuartcSessionDelegate> server_session_delegate_;
std::unique_ptr<FakeQuartcEndpointDelegate> server_endpoint_delegate_;
std::unique_ptr<QuartcClientEndpoint> client_endpoint_;
std::unique_ptr<QuartcServerEndpoint> server_endpoint_;
QuartcSession* client_peer_ = nullptr;
QuartcSession* server_peer_ = nullptr;
};
TEST_F(QuartcSessionTest, SendReceiveStreams) {
CreateClientAndServerSessions(QuartcSessionConfig());
AwaitHandshake();
TestSendReceiveStreams();
}
TEST_F(QuartcSessionTest, SendReceiveMessages) {
CreateClientAndServerSessions(QuartcSessionConfig());
AwaitHandshake();
TestSendReceiveMessage();
}
TEST_F(QuartcSessionTest, SendReceiveQueuedMessages) {
CreateClientAndServerSessions(QuartcSessionConfig());
AwaitHandshake();
TestSendReceiveQueuedMessages(/*direction_from_server=*/true);
TestSendReceiveQueuedMessages(/*direction_from_server=*/false);
}
TEST_F(QuartcSessionTest, SendMessageFails) {
CreateClientAndServerSessions(QuartcSessionConfig());
AwaitHandshake();
TestSendLongMessage();
}
TEST_F(QuartcSessionTest, TestCryptoHandshakeCanWriteTriggers) {
CreateClientAndServerSessions(QuartcSessionConfig());
AwaitHandshake();
RunTasks();
ASSERT_TRUE(client_session_delegate_->writable_time().IsInitialized());
ASSERT_TRUE(
client_session_delegate_->crypto_handshake_time().IsInitialized());
// On client, we are writable 1-rtt before crypto handshake is complete.
ASSERT_LT(client_session_delegate_->writable_time(),
client_session_delegate_->crypto_handshake_time());
ASSERT_TRUE(server_session_delegate_->writable_time().IsInitialized());
ASSERT_TRUE(
server_session_delegate_->crypto_handshake_time().IsInitialized());
// On server, the writable time and crypto handshake are the same. (when SHLO
// is sent).
ASSERT_EQ(server_session_delegate_->writable_time(),
server_session_delegate_->crypto_handshake_time());
}
TEST_F(QuartcSessionTest, PreSharedKeyHandshake) {
QuartcSessionConfig config;
config.pre_shared_key = "foo";
CreateClientAndServerSessions(config);
AwaitHandshake();
TestSendReceiveStreams();
TestSendReceiveMessage();
}
// Test that data streams are not created before handshake.
TEST_F(QuartcSessionTest, CannotCreateDataStreamBeforeHandshake) {
CreateClientAndServerSessions(QuartcSessionConfig());
EXPECT_EQ(nullptr, server_peer_->CreateOutgoingBidirectionalStream());
EXPECT_EQ(nullptr, client_peer_->CreateOutgoingBidirectionalStream());
}
TEST_F(QuartcSessionTest, CancelQuartcStream) {
CreateClientAndServerSessions(QuartcSessionConfig());
AwaitHandshake();
ASSERT_TRUE(client_peer_->IsCryptoHandshakeConfirmed());
ASSERT_TRUE(server_peer_->IsCryptoHandshakeConfirmed());
QuartcStream* stream = client_peer_->CreateOutgoingBidirectionalStream();
ASSERT_NE(nullptr, stream);
uint32_t id = stream->id();
EXPECT_FALSE(client_peer_->IsClosedStream(id));
stream->SetDelegate(client_stream_delegate_.get());
client_peer_->CancelStream(id);
EXPECT_EQ(stream->stream_error(),
QuicRstStreamErrorCode::QUIC_STREAM_CANCELLED);
EXPECT_TRUE(client_peer_->IsClosedStream(id));
}
// TODO(b/112561077): This is the wrong layer for this test. We should write a
// test specifically for QuartcPacketWriter with a stubbed-out
// QuartcPacketTransport and remove
// SimulatedQuartcPacketTransport::last_packet_number().
TEST_F(QuartcSessionTest, WriterGivesPacketNumberToTransport) {
CreateClientAndServerSessions(QuartcSessionConfig());
AwaitHandshake();
ASSERT_TRUE(client_peer_->IsCryptoHandshakeConfirmed());
ASSERT_TRUE(server_peer_->IsCryptoHandshakeConfirmed());
QuartcStream* stream = client_peer_->CreateOutgoingBidirectionalStream();
stream->SetDelegate(client_stream_delegate_.get());
char kClientMessage[] = "Hello";
test::QuicTestMemSliceVector stream_data(
{std::make_pair(kClientMessage, strlen(kClientMessage))});
stream->WriteMemSlices(stream_data.span(), /*fin=*/false);
RunTasks();
// The transport should see the latest packet number sent by QUIC.
EXPECT_EQ(
client_transport_->last_packet_number(),
client_peer_->connection()->sent_packet_manager().GetLargestSentPacket());
}
TEST_F(QuartcSessionTest, CloseConnection) {
CreateClientAndServerSessions(QuartcSessionConfig());
AwaitHandshake();
ASSERT_TRUE(client_peer_->IsCryptoHandshakeConfirmed());
ASSERT_TRUE(server_peer_->IsCryptoHandshakeConfirmed());
client_peer_->CloseConnection("Connection closed by client");
EXPECT_FALSE(client_session_delegate_->connected());
RunTasks();
EXPECT_FALSE(server_session_delegate_->connected());
}
TEST_F(QuartcSessionTest, StreamRetransmissionEnabled) {
CreateClientAndServerSessions(QuartcSessionConfig());
AwaitHandshake();
ASSERT_TRUE(client_peer_->IsCryptoHandshakeConfirmed());
ASSERT_TRUE(server_peer_->IsCryptoHandshakeConfirmed());
QuartcStream* stream = client_peer_->CreateOutgoingBidirectionalStream();
QuicStreamId stream_id = stream->id();
stream->SetDelegate(client_stream_delegate_.get());
stream->set_cancel_on_loss(false);
client_filter_->set_packets_to_drop(1);
char kClientMessage[] = "Hello";
test::QuicTestMemSliceVector stream_data(
{std::make_pair(kClientMessage, strlen(kClientMessage))});
stream->WriteMemSlices(stream_data.span(), /*fin=*/false);
RunTasks();
// Stream data should make it despite packet loss.
ASSERT_TRUE(server_stream_delegate_->has_data());
EXPECT_EQ(server_stream_delegate_->data()[stream_id], kClientMessage);
}
TEST_F(QuartcSessionTest, StreamRetransmissionDisabled) {
// Disable tail loss probe, otherwise test maybe flaky because dropped
// message will be retransmitted to detect tail loss.
QuartcSessionConfig session_config;
session_config.enable_tail_loss_probe = false;
CreateClientAndServerSessions(session_config);
// Disable probing retransmissions, otherwise test maybe flaky because dropped
// message will be retransmitted to to probe for more bandwidth.
client_peer_->connection()->set_fill_up_link_during_probing(false);
AwaitHandshake();
ASSERT_TRUE(client_peer_->IsCryptoHandshakeConfirmed());
ASSERT_TRUE(server_peer_->IsCryptoHandshakeConfirmed());
// The client sends an ACK for the crypto handshake next. This must be
// flushed before we set the filter to drop the next packet, in order to
// ensure that the filter drops a data-bearing packet instead of just an ack.
RunTasks();
QuartcStream* stream = client_peer_->CreateOutgoingBidirectionalStream();
QuicStreamId stream_id = stream->id();
stream->SetDelegate(client_stream_delegate_.get());
stream->set_cancel_on_loss(true);
client_filter_->set_packets_to_drop(1);
char kMessage[] = "Hello";
test::QuicTestMemSliceVector stream_data(
{std::make_pair(kMessage, strlen(kMessage))});
stream->WriteMemSlices(stream_data.span(), /*fin=*/false);
simulator_.RunFor(QuicTime::Delta::FromMilliseconds(1));
// Send another packet to trigger loss detection.
QuartcStream* stream_1 = client_peer_->CreateOutgoingBidirectionalStream();
stream_1->SetDelegate(client_stream_delegate_.get());
char kMessage1[] = "Second message";
test::QuicTestMemSliceVector stream_data_1(
{std::make_pair(kMessage1, strlen(kMessage1))});
stream_1->WriteMemSlices(stream_data_1.span(), /*fin=*/false);
RunTasks();
// QUIC should try to retransmit the first stream by loss detection. Instead,
// it will cancel itself.
EXPECT_THAT(server_stream_delegate_->data()[stream_id], testing::IsEmpty());
EXPECT_TRUE(client_peer_->IsClosedStream(stream_id));
EXPECT_TRUE(server_peer_->IsClosedStream(stream_id));
EXPECT_EQ(client_stream_delegate_->stream_error(stream_id),
QUIC_STREAM_CANCELLED);
EXPECT_EQ(server_stream_delegate_->stream_error(stream_id),
QUIC_STREAM_CANCELLED);
}
TEST_F(QuartcSessionTest, ServerRegistersAsWriteBlocked) {
// Initialize client and server session, but with the server write-blocked.
Init();
server_transport_->SetWritable(false);
CreateClientAndServerSessions(QuartcSessionConfig(), /*init=*/false);
// Let the client send a few copies of the CHLO. The server can't respond, as
// it's still write-blocked.
RunTasks();
// Making the server's transport writable should trigger a callback that
// reaches the server session, allowing it to write packets.
server_transport_->SetWritable(true);
// Now the server should respond with the SHLO, encryption should be
// established, and data should flow normally.
// Note that if the server is *not* correctly registered as write-blocked,
// it will crash here (see b/124527328 for details).
AwaitHandshake();
TestSendReceiveStreams();
}
TEST_F(QuartcSessionTest, PreSharedKeyHandshakeIs0RTT) {
QuartcSessionConfig session_config;
session_config.pre_shared_key = "foo";
// Client endpoint is created below. Destructing client endpoint
// causes issues with the simulator.
Init(/*create_client_endpoint=*/false);
server_endpoint_->Connect(server_transport_.get());
client_endpoint_ = QuicMakeUnique<QuartcClientEndpoint>(
simulator_.GetAlarmFactory(), simulator_.GetClock(),
simulator_.GetRandomGenerator(), client_endpoint_delegate_.get(),
QuartcSessionConfig(),
// This is the key line here. It passes through the server config
// from the server to the client.
server_endpoint_->server_crypto_config());
client_endpoint_->Connect(client_transport_.get());
// Running for 1ms. This is shorter than the RTT, so the
// client session should be created, but server won't be created yet.
simulator_.RunFor(QuicTime::Delta::FromMilliseconds(1));
client_peer_ = client_endpoint_delegate_->session();
server_peer_ = server_endpoint_delegate_->session();
ASSERT_NE(client_peer_, nullptr);
ASSERT_EQ(server_peer_, nullptr);
// Write data to the client before running tasks. This should be sent by the
// client and received by the server if the handshake is 0RTT.
// If this test fails, add 'RunTasks()' above, and see what error is sent
// by the server in the rejection message.
QuartcStream* stream = client_peer_->CreateOutgoingBidirectionalStream();
ASSERT_NE(stream, nullptr);
QuicStreamId stream_id = stream->id();
stream->SetDelegate(client_stream_delegate_.get());
char message[] = "Hello in 0RTTs!";
test::QuicTestMemSliceVector data({std::make_pair(message, strlen(message))});
stream->WriteMemSlices(data.span(), /*fin=*/false);
// This will now run the rest of the connection. But the
// Server peer will receive the CHLO and message after 1 delay.
simulator_.RunFor(kPropagationDelayAndABit);
// If we can decrypt the data, it means that 0 rtt was successful.
// This is because we waited only a propagation delay. So if the decryption
// failed, we would send sREJ instead of SHLO, but it wouldn't be delivered to
// the client yet.
ASSERT_TRUE(server_stream_delegate_->has_data());
EXPECT_EQ(server_stream_delegate_->data()[stream_id], message);
}
} // namespace
} // namespace quic