// Copyright (c) 2012 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_crypto_client_stream.h"

#include "base/memory/scoped_ptr.h"
#include "net/quic/crypto/aes_128_gcm_12_encrypter.h"
#include "net/quic/crypto/quic_decrypter.h"
#include "net/quic/crypto/quic_encrypter.h"
#include "net/quic/quic_flags.h"
#include "net/quic/quic_protocol.h"
#include "net/quic/quic_server_id.h"
#include "net/quic/quic_utils.h"
#include "net/quic/test_tools/crypto_test_utils.h"
#include "net/quic/test_tools/quic_test_utils.h"
#include "net/quic/test_tools/simple_quic_framer.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"

using std::string;
using std::vector;

namespace net {
namespace test {
namespace {

const char kServerHostname[] = "test.example.com";
const uint16 kServerPort = 443;

class QuicCryptoClientStreamTest : public ::testing::Test {
 public:
  QuicCryptoClientStreamTest()
      : server_id_(kServerHostname, kServerPort, PRIVACY_MODE_DISABLED),
        crypto_config_(CryptoTestUtils::ProofVerifierForTesting()) {
    CreateConnection();
  }

  void CreateConnection() {
    connection_ = new PacketSavingConnection(&helper_, Perspective::IS_CLIENT);
    // Advance the time, because timers do not like uninitialized times.
    connection_->AdvanceTime(QuicTime::Delta::FromSeconds(1));

    session_.reset(new TestQuicSpdyClientSession(
        connection_, DefaultQuicConfig(), server_id_, &crypto_config_));
  }

  void CompleteCryptoHandshake() {
    stream()->CryptoConnect();
    CryptoTestUtils::HandshakeWithFakeServer(&helper_, connection_, stream(),
                                             server_options_);
  }

  void ConstructHandshakeMessage() {
    CryptoFramer framer;
    message_data_.reset(framer.ConstructHandshakeMessage(message_));
  }

  QuicCryptoClientStream* stream() { return session_->GetCryptoStream(); }

  MockConnectionHelper helper_;
  PacketSavingConnection* connection_;
  scoped_ptr<TestQuicSpdyClientSession> session_;
  QuicServerId server_id_;
  CryptoHandshakeMessage message_;
  scoped_ptr<QuicData> message_data_;
  QuicCryptoClientConfig crypto_config_;
  CryptoTestUtils::FakeServerOptions server_options_;
};

TEST_F(QuicCryptoClientStreamTest, NotInitiallyConected) {
  EXPECT_FALSE(stream()->encryption_established());
  EXPECT_FALSE(stream()->handshake_confirmed());
}

TEST_F(QuicCryptoClientStreamTest, ConnectedAfterSHLO) {
  CompleteCryptoHandshake();
  EXPECT_TRUE(stream()->encryption_established());
  EXPECT_TRUE(stream()->handshake_confirmed());
}

TEST_F(QuicCryptoClientStreamTest, MessageAfterHandshake) {
  CompleteCryptoHandshake();

  EXPECT_CALL(*connection_, SendConnectionClose(
      QUIC_CRYPTO_MESSAGE_AFTER_HANDSHAKE_COMPLETE));
  message_.set_tag(kCHLO);
  ConstructHandshakeMessage();
  stream()->OnStreamFrame(QuicStreamFrame(kCryptoStreamId, /*fin=*/false,
                                          /*offset=*/0,
                                          message_data_->AsStringPiece()));
}

TEST_F(QuicCryptoClientStreamTest, BadMessageType) {
  stream()->CryptoConnect();

  message_.set_tag(kCHLO);
  ConstructHandshakeMessage();

  EXPECT_CALL(*connection_, SendConnectionCloseWithDetails(
        QUIC_INVALID_CRYPTO_MESSAGE_TYPE, "Expected REJ"));
  stream()->OnStreamFrame(QuicStreamFrame(kCryptoStreamId, /*fin=*/false,
                                          /*offset=*/0,
                                          message_data_->AsStringPiece()));
}

TEST_F(QuicCryptoClientStreamTest, NegotiatedParameters) {
  CompleteCryptoHandshake();

  const QuicConfig* config = session_->config();
  EXPECT_EQ(kMaximumIdleTimeoutSecs,
            config->IdleConnectionStateLifetime().ToSeconds());
  EXPECT_EQ(kDefaultMaxStreamsPerConnection,
            config->MaxStreamsPerConnection());

  const QuicCryptoNegotiatedParameters& crypto_params(
      stream()->crypto_negotiated_params());
  EXPECT_EQ(crypto_config_.aead[0], crypto_params.aead);
  EXPECT_EQ(crypto_config_.kexs[0], crypto_params.key_exchange);
}

TEST_F(QuicCryptoClientStreamTest, ExpiredServerConfig) {
  // Seed the config with a cached server config.
  CompleteCryptoHandshake();

  // Recreate connection with the new config.
  CreateConnection();

  // Advance time 5 years to ensure that we pass the expiry time of the cached
  // server config.
  connection_->AdvanceTime(
      QuicTime::Delta::FromSeconds(60 * 60 * 24 * 365 * 5));

  stream()->CryptoConnect();
  // Check that a client hello was sent.
  ASSERT_EQ(1u, connection_->encrypted_packets_.size());
}

TEST_F(QuicCryptoClientStreamTest, InvalidCachedServerConfig) {
  // Seed the config with a cached server config.
  CompleteCryptoHandshake();

  // Recreate connection with the new config.
  CreateConnection();

  QuicCryptoClientConfig::CachedState* state =
      crypto_config_.LookupOrCreate(server_id_);

  vector<string> certs = state->certs();
  string cert_sct = state->cert_sct();
  string signature = state->signature();
  state->SetProof(certs, cert_sct, signature + signature);

  stream()->CryptoConnect();
  // Check that a client hello was sent.
  ASSERT_EQ(1u, connection_->encrypted_packets_.size());
}

TEST_F(QuicCryptoClientStreamTest, ServerConfigUpdate) {
  // Test that the crypto client stream can receive server config updates after
  // the connection has been established.
  CompleteCryptoHandshake();

  QuicCryptoClientConfig::CachedState* state =
      crypto_config_.LookupOrCreate(server_id_);

  // Ensure cached STK is different to what we send in the handshake.
  EXPECT_NE("xstk", state->source_address_token());

  // Initialize using {...} syntax to avoid trailing \0 if converting from
  // string.
  unsigned char stk[] = { 'x', 's', 't', 'k' };

  // Minimum SCFG that passes config validation checks.
  unsigned char scfg[] = {
    // SCFG
    0x53, 0x43, 0x46, 0x47,
    // num entries
    0x01, 0x00,
    // padding
    0x00, 0x00,
    // EXPY
    0x45, 0x58, 0x50, 0x59,
    // EXPY end offset
    0x08, 0x00, 0x00, 0x00,
    // Value
    '1',  '2',  '3',  '4',
    '5',  '6',  '7',  '8'
  };

  CryptoHandshakeMessage server_config_update;
  server_config_update.set_tag(kSCUP);
  server_config_update.SetValue(kSourceAddressTokenTag, stk);
  server_config_update.SetValue(kSCFG, scfg);

  scoped_ptr<QuicData> data(
      CryptoFramer::ConstructHandshakeMessage(server_config_update));
  stream()->OnStreamFrame(QuicStreamFrame(kCryptoStreamId, /*fin=*/false,
                                          /*offset=*/0, data->AsStringPiece()));

  // Make sure that the STK and SCFG are cached correctly.
  EXPECT_EQ("xstk", state->source_address_token());

  string cached_scfg = state->server_config();
  test::CompareCharArraysWithHexError(
      "scfg", cached_scfg.data(), cached_scfg.length(),
      QuicUtils::AsChars(scfg), arraysize(scfg));
}

TEST_F(QuicCryptoClientStreamTest, ServerConfigUpdateBeforeHandshake) {
  EXPECT_CALL(*connection_, SendConnectionClose(
      QUIC_CRYPTO_UPDATE_BEFORE_HANDSHAKE_COMPLETE));
  CryptoHandshakeMessage server_config_update;
  server_config_update.set_tag(kSCUP);
  scoped_ptr<QuicData> data(
      CryptoFramer::ConstructHandshakeMessage(server_config_update));
  stream()->OnStreamFrame(QuicStreamFrame(kCryptoStreamId, /*fin=*/false,
                                          /*offset=*/0, data->AsStringPiece()));
}

TEST_F(QuicCryptoClientStreamTest, TokenBindingNegotiation) {
  server_options_.token_binding_enabled = true;
  crypto_config_.tb_key_params.push_back(kP256);

  CompleteCryptoHandshake();
  EXPECT_TRUE(stream()->encryption_established());
  EXPECT_TRUE(stream()->handshake_confirmed());
  EXPECT_EQ(kP256,
            stream()->crypto_negotiated_params().token_binding_key_param);
}

TEST_F(QuicCryptoClientStreamTest, NoTokenBindingWithoutServerSupport) {
  crypto_config_.tb_key_params.push_back(kP256);

  CompleteCryptoHandshake();
  EXPECT_TRUE(stream()->encryption_established());
  EXPECT_TRUE(stream()->handshake_confirmed());
  EXPECT_EQ(0u, stream()->crypto_negotiated_params().token_binding_key_param);
}

TEST_F(QuicCryptoClientStreamTest, NoTokenBindingWithoutClientSupport) {
  server_options_.token_binding_enabled = true;

  CompleteCryptoHandshake();
  EXPECT_TRUE(stream()->encryption_established());
  EXPECT_TRUE(stream()->handshake_confirmed());
  EXPECT_EQ(0u, stream()->crypto_negotiated_params().token_binding_key_param);
}

TEST_F(QuicCryptoClientStreamTest, TokenBindingNotNegotiated) {
  CompleteCryptoHandshake();
  EXPECT_TRUE(stream()->encryption_established());
  EXPECT_TRUE(stream()->handshake_confirmed());
  EXPECT_EQ(0u, stream()->crypto_negotiated_params().token_binding_key_param);
}

class QuicCryptoClientStreamStatelessTest : public ::testing::Test {
 public:
  QuicCryptoClientStreamStatelessTest()
      : client_crypto_config_(CryptoTestUtils::ProofVerifierForTesting()),
        server_crypto_config_(QuicCryptoServerConfig::TESTING,
                              QuicRandom::GetInstance(),
                              CryptoTestUtils::ProofSourceForTesting()),
        server_id_(kServerHostname, kServerPort, PRIVACY_MODE_DISABLED) {
    TestQuicSpdyClientSession* client_session = nullptr;
    CreateClientSessionForTest(
        server_id_,
        /* supports_stateless_rejects= */ true,
        QuicTime::Delta::FromSeconds(100000), QuicSupportedVersions(), &helper_,
        &client_crypto_config_, &client_connection_, &client_session);
    CHECK(client_session);
    client_session_.reset(client_session);
  }

  QuicCryptoServerStream* server_stream() {
    return server_session_->GetCryptoStream();
  }

  void AdvanceHandshakeWithFakeServer() {
    client_session_->GetCryptoStream()->CryptoConnect();
    CryptoTestUtils::AdvanceHandshake(client_connection_,
                                      client_session_->GetCryptoStream(), 0,
                                      server_connection_, server_stream(), 0);
  }

  // Initializes the server_stream_ for stateless rejects.
  void InitializeFakeStatelessRejectServer() {
    TestQuicSpdyServerSession* server_session = nullptr;
    CreateServerSessionForTest(server_id_, QuicTime::Delta::FromSeconds(100000),
                               QuicSupportedVersions(), &helper_,
                               &server_crypto_config_, &server_connection_,
                               &server_session);
    CHECK(server_session);
    server_session_.reset(server_session);
    CryptoTestUtils::FakeServerOptions options;
    CryptoTestUtils::SetupCryptoServerConfigForTest(
        server_connection_->clock(), server_connection_->random_generator(),
        server_session_->config(), &server_crypto_config_, options);
    FLAGS_enable_quic_stateless_reject_support = true;
  }

  MockConnectionHelper helper_;

  // Client crypto stream state
  PacketSavingConnection* client_connection_;
  scoped_ptr<TestQuicSpdyClientSession> client_session_;
  QuicCryptoClientConfig client_crypto_config_;

  // Server crypto stream state
  PacketSavingConnection* server_connection_;
  scoped_ptr<TestQuicSpdyServerSession> server_session_;
  QuicCryptoServerConfig server_crypto_config_;
  QuicServerId server_id_;
};

TEST_F(QuicCryptoClientStreamStatelessTest, StatelessReject) {
  ValueRestore<bool> old_flag(&FLAGS_enable_quic_stateless_reject_support,
                              true);

  QuicCryptoClientConfig::CachedState* client_state =
      client_crypto_config_.LookupOrCreate(server_id_);

  EXPECT_FALSE(client_state->has_server_designated_connection_id());
  EXPECT_CALL(*client_session_, OnProofValid(testing::_));

  InitializeFakeStatelessRejectServer();
  AdvanceHandshakeWithFakeServer();

  EXPECT_EQ(1, server_stream()->NumHandshakeMessages());
  EXPECT_EQ(0, server_stream()->NumHandshakeMessagesWithServerNonces());

  EXPECT_FALSE(client_session_->GetCryptoStream()->encryption_established());
  EXPECT_FALSE(client_session_->GetCryptoStream()->handshake_confirmed());
  // Even though the handshake was not complete, the cached client_state is
  // complete, and can be used for a subsequent successful handshake.
  EXPECT_TRUE(client_state->IsComplete(QuicWallTime::FromUNIXSeconds(0)));

  ASSERT_TRUE(client_state->has_server_nonce());
  ASSERT_FALSE(client_state->GetNextServerNonce().empty());
  ASSERT_TRUE(client_state->has_server_designated_connection_id());
  QuicConnectionId server_designated_id =
      client_state->GetNextServerDesignatedConnectionId();
  QuicConnectionId expected_id =
      server_session_->connection()->random_generator()->RandUint64();
  EXPECT_EQ(expected_id, server_designated_id);
  EXPECT_FALSE(client_state->has_server_designated_connection_id());
}

}  // namespace
}  // namespace test
}  // namespace net