network_time_tracker: add temporary time protocol.

components/network_time/network_time_tracker_unittest.cc

 // Copyright 2014 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 "components/network_time/network_time_tracker.h"
 
 #include <memory>
+#include <utility>
 
 #include "base/compiler_specific.h"
+#include "base/feature_list.h"
+#include "base/strings/stringprintf.h"
 #include "base/test/simple_test_clock.h"
 #include "base/test/simple_test_tick_clock.h"
+#include "components/client_update_protocol/ecdsa.h"
 #include "components/network_time/network_time_pref_names.h"
 #include "components/prefs/testing_pref_service.h"
+#include "net/http/http_response_headers.h"
+#include "net/test/embedded_test_server/embedded_test_server.h"
+#include "net/test/embedded_test_server/http_response.h"
+#include "net/url_request/url_fetcher.h"
+#include "net/url_request/url_request_test_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace network_time {
 
 class NetworkTimeTrackerTest : public testing::Test {
  public:
   ~NetworkTimeTrackerTest() override {}
 
-  void SetUp() override {
+  NetworkTimeTrackerTest()
+      : io_thread_("IO thread"),
+        clock_(new base::SimpleTestClock),
+        tick_clock_(new base::SimpleTestTickClock),
+        test_server_(new net::EmbeddedTestServer) {
+    base::Thread::Options thread_options;
+    thread_options.message_loop_type = base::MessageLoop::TYPE_IO;
+    EXPECT_TRUE(io_thread_.StartWithOptions(thread_options));
     NetworkTimeTracker::RegisterPrefs(pref_service_.registry());
 
-    clock_ = new base::SimpleTestClock();
-    tick_clock_ = new base::SimpleTestTickClock();
+    tracker_.reset(new NetworkTimeTracker(
+        std::unique_ptr<base::Clock>(clock_),
+        std::unique_ptr<base::TickClock>(tick_clock_), &pref_service_,
+        new net::TestURLRequestContextGetter(io_thread_.task_runner())));
+
     // Do this to be sure that |is_null| returns false.
     clock_->Advance(base::TimeDelta::FromDays(111));
     tick_clock_->Advance(base::TimeDelta::FromDays(222));
 
-    tracker_.reset(new NetworkTimeTracker(
-        std::unique_ptr<base::Clock>(clock_),
-        std::unique_ptr<base::TickClock>(tick_clock_), &pref_service_));
-
     // Can not be smaller than 15, it's the NowFromSystemTime() resolution.
     resolution_ = base::TimeDelta::FromMilliseconds(17);
     latency_ = base::TimeDelta::FromMilliseconds(50);
     adjustment_ = 7 * base::TimeDelta::FromMilliseconds(kTicksResolutionMs);
+
+    SetNetworkQueriesWithFinch(true);
   }
 
+  void TearDown() override { io_thread_.Stop(); }
+
   // Replaces |tracker_| with a new object, while preserving the
   // testing clocks.
   void Reset() {
     base::SimpleTestClock* new_clock = new base::SimpleTestClock();
     new_clock->SetNow(clock_->Now());
     base::SimpleTestTickClock* new_tick_clock = new base::SimpleTestTickClock();
     new_tick_clock->SetNowTicks(tick_clock_->NowTicks());
     clock_ = new_clock;
-    tick_clock_= new_tick_clock;
+    tick_clock_ = new_tick_clock;
     tracker_.reset(new NetworkTimeTracker(
         std::unique_ptr<base::Clock>(clock_),
-        std::unique_ptr<base::TickClock>(tick_clock_), &pref_service_));
+        std::unique_ptr<base::TickClock>(tick_clock_), &pref_service_,
+        new net::TestURLRequestContextGetter(io_thread_.task_runner())));
+  }
+
+  // Returns a valid time response.  Update as follows:
+  //
+  // curl http://clients2.google.com/time/1/current?cup2key=1:123123123
+  //
+  // where 1 is the key version and 123123123 is the nonce.  Copy the nonce, the
+  // response, and the x-cup-server-proof header into the test.
+  static std::unique_ptr<net::test_server::HttpResponse>
+  GoodTimeResponseHandler(const net::test_server::HttpRequest& request) {
+    net::test_server::BasicHttpResponse* response =
+        new net::test_server::BasicHttpResponse();
+    response->set_code(net::HTTP_OK);
+    response->set_content(
+        ")]}'\n"
+        "{\"current_time_millis\":1461621971825,\"server_nonce\":-6."
+        "006853099049523E85}");
+    response->AddCustomHeader(
+        "x-cup-server-proof",
+        "304402202e0f24db1ea69f1bbe81da4108f381fcf7a2781c53cf7663cb47083cb5fe8e"
+        "fd"
+        "022009d2b67c0deceaaf849f7c529be96701ed5f15d5efcaf401a94e0801accc9832:"
+        "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855");
+    return std::unique_ptr<net::test_server::HttpResponse>(response);
+  }
+
+  // Good signature over invalid data, though made with a non-production key.
+  static std::unique_ptr<net::test_server::HttpResponse> BadDataResponseHandler(
+      const net::test_server::HttpRequest& request) {
+    net::test_server::BasicHttpResponse* response =
+        new net::test_server::BasicHttpResponse();
+    response->set_code(net::HTTP_OK);
+    response->set_content(
+        ")]}'\n"
+        "{\"current_time_millis\":NaN,\"server_nonce\":9.420921002039447E182}");
+    response->AddCustomHeader(
+        "x-cup-server-proof",
+        "3046022100a07aa437b24f1f6bb7ff6f6d1e004dd4bcb717c93e21d6bae5ef8d6d984c"
+        "86a7022100e423419ff49fae37b421ef6cdeab348b45c63b236ab365f36f4cd3b4d4d6"
+        "d852:"
+        "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b85"
+        "5");
+    return std::unique_ptr<net::test_server::HttpResponse>(response);
+  }
+
+  static std::unique_ptr<net::test_server::HttpResponse>
+  BadSignatureResponseHandler(const net::test_server::HttpRequest& request) {
+    net::test_server::BasicHttpResponse* response =
+        new net::test_server::BasicHttpResponse();
+    response->set_code(net::HTTP_OK);
+    response->set_content(
+        ")]}'\n"
+        "{\"current_time_millis\":1461621971825,\"server_nonce\":-6."
+        "006853099049523E85}");
+    response->AddCustomHeader("x-cup-server-proof", "dead:beef");
+    return std::unique_ptr<net::test_server::HttpResponse>(response);
+  }
+
+  static std::unique_ptr<net::test_server::HttpResponse>
+  ServerErrorResponseHandler(const net::test_server::HttpRequest& request) {
+    net::test_server::BasicHttpResponse* response =
+        new net::test_server::BasicHttpResponse();
+    response->set_code(net::HTTP_INTERNAL_SERVER_ERROR);
+    return std::unique_ptr<net::test_server::HttpResponse>(response);
+  }
+
+  static std::unique_ptr<net::test_server::HttpResponse>
+  NetworkErrorResponseHandler(const net::test_server::HttpRequest& request) {
+    return std::unique_ptr<net::test_server::HttpResponse>(
+        new net::test_server::RawHttpResponse("", ""));
   }
 
   // Updates the notifier's time with the specified parameters.
   void UpdateNetworkTime(const base::Time& network_time,
                          const base::TimeDelta& resolution,
                          const base::TimeDelta& latency,
                          const base::TimeTicks& post_time) {
     tracker_->UpdateNetworkTime(
         network_time, resolution, latency, post_time);
   }
 
   // Advances both the system clock and the tick clock.  This should be used for
   // the normal passage of time, i.e. when neither clock is doing anything odd.
   void AdvanceBoth(const base::TimeDelta& delta) {
     tick_clock_->Advance(delta);
     clock_->Advance(delta);
   }
 
  protected:
+  void SetNetworkQueriesWithFinch(bool enable) {
+    base::FeatureList::ClearInstanceForTesting();
+    std::unique_ptr<base::FeatureList> feature_list(new base::FeatureList);
+    if (enable) {
+      feature_list->InitializeFromCommandLine("NetworkTimeServiceQuerying", "");
+    }
+    base::FeatureList::SetInstance(std::move(feature_list));
+  }
+
+  base::Thread io_thread_;
+  base::MessageLoop message_loop_;
   base::TimeDelta resolution_;
   base::TimeDelta latency_;
   base::TimeDelta adjustment_;
   base::SimpleTestClock* clock_;
   base::SimpleTestTickClock* tick_clock_;
   TestingPrefServiceSimple pref_service_;
   std::unique_ptr<NetworkTimeTracker> tracker_;
+  std::unique_ptr<net::EmbeddedTestServer> test_server_;
 };
 
 TEST_F(NetworkTimeTrackerTest, Uninitialized) {
   base::Time network_time;
   base::TimeDelta uncertainty;
   EXPECT_FALSE(tracker_->GetNetworkTime(&network_time, &uncertainty));
 }
 
 TEST_F(NetworkTimeTrackerTest, LongPostingDelay) {
   // The request arrives at the server, which records the time.  Advance the
@@ skipping 35 matching lines @@
   EXPECT_GT(out_network_time + uncertainty / 2, clock_->Now());
 }
 
 TEST_F(NetworkTimeTrackerTest, ClockIsWack) {
   // Now let's assume the system clock is completely wrong.
   base::Time in_network_time = clock_->Now() - base::TimeDelta::FromDays(90);
   UpdateNetworkTime(in_network_time - latency_ / 2, resolution_, latency_,
                     tick_clock_->NowTicks());
 
   base::Time out_network_time;
-  EXPECT_TRUE(tracker_->GetNetworkTime(&out_network_time, NULL));
+  EXPECT_TRUE(tracker_->GetNetworkTime(&out_network_time, nullptr));
   EXPECT_EQ(in_network_time, out_network_time);
 }
 
 TEST_F(NetworkTimeTrackerTest, ClocksDivergeSlightly) {
   // The two clocks are allowed to diverge a little bit.
   base::Time in_network_time = clock_->Now();
   UpdateNetworkTime(in_network_time - latency_ / 2, resolution_, latency_,
                     tick_clock_->NowTicks());
 
   base::TimeDelta small = base::TimeDelta::FromSeconds(30);
@@ skipping 33 matching lines @@
   EXPECT_EQ(resolution_ + latency_ + adjustment_, uncertainty);
 }
 
 TEST_F(NetworkTimeTrackerTest, SpringForward) {
   // Simulate the wall clock advancing faster than the tick clock.
   UpdateNetworkTime(clock_->Now(), resolution_, latency_,
                     tick_clock_->NowTicks());
   tick_clock_->Advance(base::TimeDelta::FromSeconds(1));
   clock_->Advance(base::TimeDelta::FromDays(1));
   base::Time out_network_time;
-  EXPECT_FALSE(tracker_->GetNetworkTime(&out_network_time, NULL));
+  EXPECT_FALSE(tracker_->GetNetworkTime(&out_network_time, nullptr));
 }
 
 TEST_F(NetworkTimeTrackerTest, FallBack) {
   // Simulate the wall clock running backward.
   UpdateNetworkTime(clock_->Now(), resolution_, latency_,
                     tick_clock_->NowTicks());
   tick_clock_->Advance(base::TimeDelta::FromSeconds(1));
   clock_->Advance(base::TimeDelta::FromDays(-1));
   base::Time out_network_time;
-  EXPECT_FALSE(tracker_->GetNetworkTime(&out_network_time, NULL));
+  EXPECT_FALSE(tracker_->GetNetworkTime(&out_network_time, nullptr));
 }
 
 TEST_F(NetworkTimeTrackerTest, SuspendAndResume) {
   // Simulate the wall clock advancing while the tick clock stands still, as
   // would happen in a suspend+resume cycle.
   UpdateNetworkTime(clock_->Now(), resolution_, latency_,
                     tick_clock_->NowTicks());
   clock_->Advance(base::TimeDelta::FromHours(1));
   base::Time out_network_time;
-  EXPECT_FALSE(tracker_->GetNetworkTime(&out_network_time, NULL));
+  EXPECT_FALSE(tracker_->GetNetworkTime(&out_network_time, nullptr));
 }
 
 TEST_F(NetworkTimeTrackerTest, Serialize) {
   // Test that we can serialize and deserialize state and get consistent
   // results.
   base::Time in_network_time = clock_->Now() - base::TimeDelta::FromDays(90);
   UpdateNetworkTime(in_network_time - latency_ / 2, resolution_, latency_,
                     tick_clock_->NowTicks());
   base::Time out_network_time;
   base::TimeDelta out_uncertainty;
@@ skipping 11 matching lines @@
 }
 
 TEST_F(NetworkTimeTrackerTest, DeserializeOldFormat) {
   // Test that deserializing old data (which do not record the uncertainty and
   // tick clock) causes the serialized data to be ignored.
   base::Time in_network_time = clock_->Now() - base::TimeDelta::FromDays(90);
   UpdateNetworkTime(in_network_time - latency_ / 2, resolution_, latency_,
                     tick_clock_->NowTicks());
 
   base::Time out_network_time;
-  EXPECT_TRUE(tracker_->GetNetworkTime(&out_network_time, NULL));
+  EXPECT_TRUE(tracker_->GetNetworkTime(&out_network_time, nullptr));
   double local, network;
   const base::DictionaryValue* saved_prefs =
       pref_service_.GetDictionary(prefs::kNetworkTimeMapping);
   saved_prefs->GetDouble("local", &local);
   saved_prefs->GetDouble("network", &network);
   base::DictionaryValue prefs;
   prefs.SetDouble("local", local);
   prefs.SetDouble("network", network);
   pref_service_.Set(prefs::kNetworkTimeMapping, prefs);
   Reset();
-  EXPECT_FALSE(tracker_->GetNetworkTime(&out_network_time, NULL));
+  EXPECT_FALSE(tracker_->GetNetworkTime(&out_network_time, nullptr));
 }
 
 TEST_F(NetworkTimeTrackerTest, SerializeWithLongDelay) {
   // Test that if the serialized data are more than a week old, they are
   // discarded.
   base::Time in_network_time = clock_->Now() - base::TimeDelta::FromDays(90);
   UpdateNetworkTime(in_network_time - latency_ / 2, resolution_, latency_,
                     tick_clock_->NowTicks());
   base::Time out_network_time;
-  EXPECT_TRUE(tracker_->GetNetworkTime(&out_network_time, NULL));
+  EXPECT_TRUE(tracker_->GetNetworkTime(&out_network_time, nullptr));
   AdvanceBoth(base::TimeDelta::FromDays(8));
   Reset();
-  EXPECT_FALSE(tracker_->GetNetworkTime(&out_network_time, NULL));
+  EXPECT_FALSE(tracker_->GetNetworkTime(&out_network_time, nullptr));
 }
 
 TEST_F(NetworkTimeTrackerTest, SerializeWithTickClockAdvance) {
   // Test that serialized data are discarded if the wall clock and tick clock
   // have not advanced consistently since data were serialized.
   base::Time in_network_time = clock_->Now() - base::TimeDelta::FromDays(90);
   UpdateNetworkTime(in_network_time - latency_ / 2, resolution_, latency_,
                     tick_clock_->NowTicks());
   base::Time out_network_time;
-  EXPECT_TRUE(tracker_->GetNetworkTime(&out_network_time, NULL));
+  EXPECT_TRUE(tracker_->GetNetworkTime(&out_network_time, nullptr));
   tick_clock_->Advance(base::TimeDelta::FromDays(1));
   Reset();
-  EXPECT_FALSE(tracker_->GetNetworkTime(&out_network_time, NULL));
+  EXPECT_FALSE(tracker_->GetNetworkTime(&out_network_time, nullptr));
 }
 
 TEST_F(NetworkTimeTrackerTest, SerializeWithWallClockAdvance) {
   // Test that serialized data are discarded if the wall clock and tick clock
   // have not advanced consistently since data were serialized.
   base::Time in_network_time = clock_->Now() - base::TimeDelta::FromDays(90);
   UpdateNetworkTime(in_network_time - latency_ / 2, resolution_, latency_,
                     tick_clock_->NowTicks());
 
   base::Time out_network_time;
-  EXPECT_TRUE(tracker_->GetNetworkTime(&out_network_time, NULL));
+  EXPECT_TRUE(tracker_->GetNetworkTime(&out_network_time, nullptr));
   clock_->Advance(base::TimeDelta::FromDays(1));
   Reset();
-  EXPECT_FALSE(tracker_->GetNetworkTime(&out_network_time, NULL));
+  EXPECT_FALSE(tracker_->GetNetworkTime(&out_network_time, nullptr));
+}
+
+TEST_F(NetworkTimeTrackerTest, UpdateFromNetwork) {
+  base::Time out_network_time;
+  EXPECT_FALSE(tracker_->GetNetworkTime(&out_network_time, nullptr));
+
+  test_server_->RegisterRequestHandler(
+      base::Bind(&NetworkTimeTrackerTest::GoodTimeResponseHandler));
+  EXPECT_TRUE(test_server_->Start());
+  tracker_->SetTimeServerURLForTesting(test_server_->GetURL("/"));
+  EXPECT_TRUE(tracker_->QueryTimeServiceForTesting());
+  tracker_->WaitForFetchForTesting(123123123);
+
+  EXPECT_TRUE(tracker_->GetNetworkTime(&out_network_time, nullptr));
+  EXPECT_EQ(base::Time::UnixEpoch() +
+                base::TimeDelta::FromMilliseconds(1461621971825),
+            out_network_time);
+  // Should see no backoff in the success case.
+  EXPECT_EQ(base::TimeDelta::FromMinutes(60),
+            tracker_->GetTimerDelayForTesting());
+}
+
+TEST_F(NetworkTimeTrackerTest, NoNetworkQueryWhileSynced) {
+  base::Time in_network_time = clock_->Now();
+  UpdateNetworkTime(in_network_time, resolution_, latency_,
+                    tick_clock_->NowTicks());
+  EXPECT_FALSE(
+      tracker_->QueryTimeServiceForTesting());  // No query should be started.
+}
+
+TEST_F(NetworkTimeTrackerTest, NoNetworkQueryWhileFeatureDisabled) {
+  // Disable network time queries and check that a query is not sent.
+  SetNetworkQueriesWithFinch(false);
+  EXPECT_FALSE(tracker_->QueryTimeServiceForTesting());
+
+  // Enable time queries and check that a query is sent.
+  SetNetworkQueriesWithFinch(true);
+  EXPECT_TRUE(tracker_->QueryTimeServiceForTesting());
+  tracker_->WaitForFetchForTesting(123123123);
+}
+
+TEST_F(NetworkTimeTrackerTest, UpdateFromNetworkBadSignature) {
+  test_server_->RegisterRequestHandler(
+      base::Bind(&NetworkTimeTrackerTest::BadSignatureResponseHandler));
+  EXPECT_TRUE(test_server_->Start());
+  tracker_->SetTimeServerURLForTesting(test_server_->GetURL("/"));
+  EXPECT_TRUE(tracker_->QueryTimeServiceForTesting());
+  tracker_->WaitForFetchForTesting(123123123);
+
+  base::Time out_network_time;
+  EXPECT_FALSE(tracker_->GetNetworkTime(&out_network_time, nullptr));
+  EXPECT_EQ(base::TimeDelta::FromMinutes(120),
+            tracker_->GetTimerDelayForTesting());
+}
+
+static const uint8_t kDevKeyPubBytes[] = {
+    0x30, 0x59, 0x30, 0x13, 0x06, 0x07, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x02,
+    0x01, 0x06, 0x08, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07, 0x03,
+    0x42, 0x00, 0x04, 0xe0, 0x6b, 0x0d, 0x76, 0x75, 0xa3, 0x99, 0x7d, 0x7c,
+    0x1b, 0xd6, 0x3c, 0x73, 0xbb, 0x4b, 0xfe, 0x0a, 0xe7, 0x2f, 0x61, 0x3d,
+    0x77, 0x0a, 0xaa, 0x14, 0xd8, 0x5a, 0xbf, 0x14, 0x60, 0xec, 0xf6, 0x32,
+    0x77, 0xb5, 0xa7, 0xe6, 0x35, 0xa5, 0x61, 0xaf, 0xdc, 0xdf, 0x91, 0xce,
+    0x45, 0x34, 0x5f, 0x36, 0x85, 0x2f, 0xb9, 0x53, 0x00, 0x5d, 0x86, 0xe7,
+    0x04, 0x16, 0xe2, 0x3d, 0x21, 0x76, 0x2b};
+
+TEST_F(NetworkTimeTrackerTest, UpdateFromNetworkBadData) {
+  test_server_->RegisterRequestHandler(
+      base::Bind(&NetworkTimeTrackerTest::BadDataResponseHandler));
+  EXPECT_TRUE(test_server_->Start());
+  base::StringPiece key = {reinterpret_cast<const char*>(kDevKeyPubBytes),
+                           sizeof(kDevKeyPubBytes)};
+  tracker_->SetPublicKeyForTesting(key);
+  tracker_->SetTimeServerURLForTesting(test_server_->GetURL("/"));
+  EXPECT_TRUE(tracker_->QueryTimeServiceForTesting());
+  tracker_->WaitForFetchForTesting(123123123);
+  base::Time out_network_time;
+  EXPECT_FALSE(tracker_->GetNetworkTime(&out_network_time, nullptr));
+  EXPECT_EQ(base::TimeDelta::FromMinutes(120),
+            tracker_->GetTimerDelayForTesting());
+}
+
+TEST_F(NetworkTimeTrackerTest, UpdateFromNetworkServerError) {
+  test_server_->RegisterRequestHandler(
+      base::Bind(&NetworkTimeTrackerTest::ServerErrorResponseHandler));
+  EXPECT_TRUE(test_server_->Start());
+  tracker_->SetTimeServerURLForTesting(test_server_->GetURL("/"));
+  EXPECT_TRUE(tracker_->QueryTimeServiceForTesting());
+  tracker_->WaitForFetchForTesting(123123123);
+
+  base::Time out_network_time;
+  EXPECT_FALSE(tracker_->GetNetworkTime(&out_network_time, nullptr));
+  // Should see backoff in the error case.
+  EXPECT_EQ(base::TimeDelta::FromMinutes(120),
+            tracker_->GetTimerDelayForTesting());
+}
+
+TEST_F(NetworkTimeTrackerTest, UpdateFromNetworNetworkError) {
+  test_server_->RegisterRequestHandler(
+      base::Bind(&NetworkTimeTrackerTest::NetworkErrorResponseHandler));
+  EXPECT_TRUE(test_server_->Start());
+  tracker_->SetTimeServerURLForTesting(test_server_->GetURL("/"));
+  EXPECT_TRUE(tracker_->QueryTimeServiceForTesting());
+  tracker_->WaitForFetchForTesting(123123123);
+
+  base::Time out_network_time;
+  EXPECT_FALSE(tracker_->GetNetworkTime(&out_network_time, nullptr));
+  // Should see backoff in the error case.
+  EXPECT_EQ(base::TimeDelta::FromMinutes(120),
+            tracker_->GetTimerDelayForTesting());
+}
+
+TEST_F(NetworkTimeTrackerTest, UpdateFromNetworkLargeResponse) {
+  test_server_->RegisterRequestHandler(
+      base::Bind(&NetworkTimeTrackerTest::GoodTimeResponseHandler));
+  EXPECT_TRUE(test_server_->Start());
+  tracker_->SetTimeServerURLForTesting(test_server_->GetURL("/"));
+
+  base::Time out_network_time;
+
+  tracker_->SetMaxResponseSizeForTesting(3);
+  EXPECT_TRUE(tracker_->QueryTimeServiceForTesting());
+  tracker_->WaitForFetchForTesting(123123123);
+  EXPECT_FALSE(tracker_->GetNetworkTime(&out_network_time, nullptr));
+
+  tracker_->SetMaxResponseSizeForTesting(1024);
+  EXPECT_TRUE(tracker_->QueryTimeServiceForTesting());
+  tracker_->WaitForFetchForTesting(123123123);
+  EXPECT_TRUE(tracker_->GetNetworkTime(&out_network_time, nullptr));
 }
 
 }  // namespace network_time