// 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/cert/multi_threaded_cert_verifier.h"

#include "base/bind.h"
#include "base/debug/leak_annotations.h"
#include "base/files/file_path.h"
#include "base/format_macros.h"
#include "base/strings/stringprintf.h"
#include "net/base/net_errors.h"
#include "net/base/test_completion_callback.h"
#include "net/base/test_data_directory.h"
#include "net/cert/cert_trust_anchor_provider.h"
#include "net/cert/cert_verify_proc.h"
#include "net/cert/cert_verify_result.h"
#include "net/cert/x509_certificate.h"
#include "net/log/net_log.h"
#include "net/test/cert_test_util.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"

using testing::Mock;
using testing::ReturnRef;

namespace net {

namespace {

void FailTest(int /* result */) {
  FAIL();
}

class MockCertVerifyProc : public CertVerifyProc {
 public:
  MockCertVerifyProc() {}

 private:
  ~MockCertVerifyProc() override {}

  // CertVerifyProc implementation
  bool SupportsAdditionalTrustAnchors() const override { return false; }
  bool SupportsOCSPStapling() const override { return false; }

  int VerifyInternal(X509Certificate* cert,
                     const std::string& hostname,
                     const std::string& ocsp_response,
                     int flags,
                     CRLSet* crl_set,
                     const CertificateList& additional_trust_anchors,
                     CertVerifyResult* verify_result) override {
    verify_result->Reset();
    verify_result->verified_cert = cert;
    verify_result->cert_status = CERT_STATUS_COMMON_NAME_INVALID;
    return ERR_CERT_COMMON_NAME_INVALID;
  }
};

class MockCertTrustAnchorProvider : public CertTrustAnchorProvider {
 public:
  MockCertTrustAnchorProvider() {}
  virtual ~MockCertTrustAnchorProvider() {}

  MOCK_METHOD0(GetAdditionalTrustAnchors, const CertificateList&());
};

}  // namespace

class MultiThreadedCertVerifierTest : public ::testing::Test {
 public:
  MultiThreadedCertVerifierTest() : verifier_(new MockCertVerifyProc()) {}
  ~MultiThreadedCertVerifierTest() override {}

 protected:
  MultiThreadedCertVerifier verifier_;
};

TEST_F(MultiThreadedCertVerifierTest, CacheHit) {
  base::FilePath certs_dir = GetTestCertsDirectory();
  scoped_refptr<X509Certificate> test_cert(
      ImportCertFromFile(certs_dir, "ok_cert.pem"));
  ASSERT_NE(static_cast<X509Certificate*>(NULL), test_cert.get());

  int error;
  CertVerifyResult verify_result;
  TestCompletionCallback callback;
  scoped_ptr<CertVerifier::Request> request;

  error = verifier_.Verify(test_cert.get(), "www.example.com", std::string(), 0,
                           NULL, &verify_result, callback.callback(), &request,
                           BoundNetLog());
  ASSERT_EQ(ERR_IO_PENDING, error);
  EXPECT_TRUE(request);
  error = callback.WaitForResult();
  ASSERT_TRUE(IsCertificateError(error));
  ASSERT_EQ(1u, verifier_.requests());
  ASSERT_EQ(0u, verifier_.cache_hits());
  ASSERT_EQ(0u, verifier_.inflight_joins());
  ASSERT_EQ(1u, verifier_.GetCacheSize());

  error = verifier_.Verify(test_cert.get(), "www.example.com", std::string(), 0,
                           NULL, &verify_result, callback.callback(), &request,
                           BoundNetLog());
  // Synchronous completion.
  ASSERT_NE(ERR_IO_PENDING, error);
  ASSERT_TRUE(IsCertificateError(error));
  ASSERT_FALSE(request);
  ASSERT_EQ(2u, verifier_.requests());
  ASSERT_EQ(1u, verifier_.cache_hits());
  ASSERT_EQ(0u, verifier_.inflight_joins());
  ASSERT_EQ(1u, verifier_.GetCacheSize());
}

// Tests the same server certificate with different intermediate CA
// certificates.  These should be treated as different certificate chains even
// though the two X509Certificate objects contain the same server certificate.
TEST_F(MultiThreadedCertVerifierTest, DifferentCACerts) {
  base::FilePath certs_dir = GetTestCertsDirectory();

  scoped_refptr<X509Certificate> server_cert =
      ImportCertFromFile(certs_dir, "salesforce_com_test.pem");
  ASSERT_NE(static_cast<X509Certificate*>(NULL), server_cert.get());

  scoped_refptr<X509Certificate> intermediate_cert1 =
      ImportCertFromFile(certs_dir, "verisign_intermediate_ca_2011.pem");
  ASSERT_NE(static_cast<X509Certificate*>(NULL), intermediate_cert1.get());

  scoped_refptr<X509Certificate> intermediate_cert2 =
      ImportCertFromFile(certs_dir, "verisign_intermediate_ca_2016.pem");
  ASSERT_NE(static_cast<X509Certificate*>(NULL), intermediate_cert2.get());

  X509Certificate::OSCertHandles intermediates;
  intermediates.push_back(intermediate_cert1->os_cert_handle());
  scoped_refptr<X509Certificate> cert_chain1 =
      X509Certificate::CreateFromHandle(server_cert->os_cert_handle(),
                                        intermediates);

  intermediates.clear();
  intermediates.push_back(intermediate_cert2->os_cert_handle());
  scoped_refptr<X509Certificate> cert_chain2 =
      X509Certificate::CreateFromHandle(server_cert->os_cert_handle(),
                                        intermediates);

  int error;
  CertVerifyResult verify_result;
  TestCompletionCallback callback;
  scoped_ptr<CertVerifier::Request> request;

  error = verifier_.Verify(cert_chain1.get(), "www.example.com", std::string(),
                           0, NULL, &verify_result, callback.callback(),
                           &request, BoundNetLog());
  ASSERT_EQ(ERR_IO_PENDING, error);
  EXPECT_TRUE(request);
  error = callback.WaitForResult();
  ASSERT_TRUE(IsCertificateError(error));
  ASSERT_EQ(1u, verifier_.requests());
  ASSERT_EQ(0u, verifier_.cache_hits());
  ASSERT_EQ(0u, verifier_.inflight_joins());
  ASSERT_EQ(1u, verifier_.GetCacheSize());

  error = verifier_.Verify(cert_chain2.get(), "www.example.com", std::string(),
                           0, NULL, &verify_result, callback.callback(),
                           &request, BoundNetLog());
  ASSERT_EQ(ERR_IO_PENDING, error);
  EXPECT_TRUE(request);
  error = callback.WaitForResult();
  ASSERT_TRUE(IsCertificateError(error));
  ASSERT_EQ(2u, verifier_.requests());
  ASSERT_EQ(0u, verifier_.cache_hits());
  ASSERT_EQ(0u, verifier_.inflight_joins());
  ASSERT_EQ(2u, verifier_.GetCacheSize());
}

// Tests an inflight join.
TEST_F(MultiThreadedCertVerifierTest, InflightJoin) {
  base::FilePath certs_dir = GetTestCertsDirectory();
  scoped_refptr<X509Certificate> test_cert(
      ImportCertFromFile(certs_dir, "ok_cert.pem"));
  ASSERT_NE(static_cast<X509Certificate*>(NULL), test_cert.get());

  int error;
  CertVerifyResult verify_result;
  TestCompletionCallback callback;
  scoped_ptr<CertVerifier::Request> request;
  CertVerifyResult verify_result2;
  TestCompletionCallback callback2;
  scoped_ptr<CertVerifier::Request> request2;

  error = verifier_.Verify(test_cert.get(), "www.example.com", std::string(), 0,
                           NULL, &verify_result, callback.callback(), &request,
                           BoundNetLog());
  ASSERT_EQ(ERR_IO_PENDING, error);
  EXPECT_TRUE(request);
  error = verifier_.Verify(test_cert.get(), "www.example.com", std::string(), 0,
                           NULL, &verify_result2, callback2.callback(),
                           &request2, BoundNetLog());
  EXPECT_EQ(ERR_IO_PENDING, error);
  EXPECT_TRUE(request2);
  error = callback.WaitForResult();
  EXPECT_TRUE(IsCertificateError(error));
  error = callback2.WaitForResult();
  ASSERT_TRUE(IsCertificateError(error));
  ASSERT_EQ(2u, verifier_.requests());
  ASSERT_EQ(0u, verifier_.cache_hits());
  ASSERT_EQ(1u, verifier_.inflight_joins());
}

// Tests that the callback of a canceled request is never made.
TEST_F(MultiThreadedCertVerifierTest, CancelRequest) {
  base::FilePath certs_dir = GetTestCertsDirectory();
  scoped_refptr<X509Certificate> test_cert(
      ImportCertFromFile(certs_dir, "ok_cert.pem"));
  ASSERT_NE(static_cast<X509Certificate*>(NULL), test_cert.get());

  int error;
  CertVerifyResult verify_result;
  scoped_ptr<CertVerifier::Request> request;

  error = verifier_.Verify(test_cert.get(), "www.example.com", std::string(), 0,
                           NULL, &verify_result, base::Bind(&FailTest),
                           &request, BoundNetLog());
  ASSERT_EQ(ERR_IO_PENDING, error);
  ASSERT_TRUE(request);
  request.reset();

  // Issue a few more requests to the worker pool and wait for their
  // completion, so that the task of the canceled request (which runs on a
  // worker thread) is likely to complete by the end of this test.
  TestCompletionCallback callback;
  for (int i = 0; i < 5; ++i) {
    error = verifier_.Verify(test_cert.get(), "www2.example.com", std::string(),
                             0, NULL, &verify_result, callback.callback(),
                             &request, BoundNetLog());
    ASSERT_EQ(ERR_IO_PENDING, error);
    EXPECT_TRUE(request);
    error = callback.WaitForResult();
    verifier_.ClearCache();
  }
}

// Tests that a canceled request is not leaked.
TEST_F(MultiThreadedCertVerifierTest, CancelRequestThenQuit) {
  base::FilePath certs_dir = GetTestCertsDirectory();
  scoped_refptr<X509Certificate> test_cert(
      ImportCertFromFile(certs_dir, "ok_cert.pem"));
  ASSERT_NE(static_cast<X509Certificate*>(NULL), test_cert.get());

  int error;
  CertVerifyResult verify_result;
  TestCompletionCallback callback;
  scoped_ptr<CertVerifier::Request> request;

  {
    // Because shutdown intentionally doesn't join worker threads, memory may
    // be leaked if the main thread shuts down before the worker thread
    // completes. In particular MultiThreadedCertVerifier calls
    // base::WorkerPool::PostTaskAndReply(), which leaks its "relay" when it
    // can't post the reply back to the origin thread. See
    // https://crbug.com/522514
    ANNOTATE_SCOPED_MEMORY_LEAK;
    error = verifier_.Verify(test_cert.get(), "www.example.com", std::string(),
                             0, NULL, &verify_result, callback.callback(),
                             &request, BoundNetLog());
  }
  ASSERT_EQ(ERR_IO_PENDING, error);
  EXPECT_TRUE(request);
  request.reset();
  // Destroy |verifier| by going out of scope.
}

TEST_F(MultiThreadedCertVerifierTest, RequestParamsComparators) {
  SHA1HashValue a_key;
  memset(a_key.data, 'a', sizeof(a_key.data));

  SHA1HashValue z_key;
  memset(z_key.data, 'z', sizeof(z_key.data));

  const CertificateList empty_list;
  CertificateList test_list;
  test_list.push_back(
      ImportCertFromFile(GetTestCertsDirectory(), "ok_cert.pem"));

  struct {
    // Keys to test
    MultiThreadedCertVerifier::RequestParams key1;
    MultiThreadedCertVerifier::RequestParams key2;

    // Expectation:
    // -1 means key1 is less than key2
    //  0 means key1 equals key2
    //  1 means key1 is greater than key2
    int expected_result;
  } tests[] = {
      {
       // Test for basic equivalence.
       MultiThreadedCertVerifier::RequestParams(
           a_key, a_key, "www.example.test", std::string(), 0, test_list),
       MultiThreadedCertVerifier::RequestParams(
           a_key, a_key, "www.example.test", std::string(), 0, test_list),
       0,
      },
      {
       // Test that different certificates but with the same CA and for
       // the same host are different validation keys.
       MultiThreadedCertVerifier::RequestParams(
           a_key, a_key, "www.example.test", std::string(), 0, test_list),
       MultiThreadedCertVerifier::RequestParams(
           z_key, a_key, "www.example.test", std::string(), 0, test_list),
       -1,
      },
      {
       // Test that the same EE certificate for the same host, but with
       // different chains are different validation keys.
       MultiThreadedCertVerifier::RequestParams(
           a_key, z_key, "www.example.test", std::string(), 0, test_list),
       MultiThreadedCertVerifier::RequestParams(
           a_key, a_key, "www.example.test", std::string(), 0, test_list),
       1,
      },
      {
       // The same certificate, with the same chain, but for different
       // hosts are different validation keys.
       MultiThreadedCertVerifier::RequestParams(
           a_key, a_key, "www1.example.test", std::string(), 0, test_list),
       MultiThreadedCertVerifier::RequestParams(
           a_key, a_key, "www2.example.test", std::string(), 0, test_list),
       -1,
      },
      {
       // The same certificate, chain, and host, but with different flags
       // are different validation keys.
       MultiThreadedCertVerifier::RequestParams(
           a_key, a_key, "www.example.test", std::string(),
           CertVerifier::VERIFY_EV_CERT, test_list),
       MultiThreadedCertVerifier::RequestParams(
           a_key, a_key, "www.example.test", std::string(), 0, test_list),
       1,
      },
      {
       // Different additional_trust_anchors.
       MultiThreadedCertVerifier::RequestParams(
           a_key, a_key, "www.example.test", std::string(), 0, empty_list),
       MultiThreadedCertVerifier::RequestParams(
           a_key, a_key, "www.example.test", std::string(), 0, test_list),
       -1,
      },
      {
       // Different OCSP responses.
       MultiThreadedCertVerifier::RequestParams(
           a_key, a_key, "www.example.test", "ocsp response", 0, test_list),
       MultiThreadedCertVerifier::RequestParams(
           a_key, a_key, "www.example.test", std::string(), 0, test_list),
       -1,
      },
  };
  for (size_t i = 0; i < arraysize(tests); ++i) {
    SCOPED_TRACE(base::StringPrintf("Test[%" PRIuS "]", i));

    const MultiThreadedCertVerifier::RequestParams& key1 = tests[i].key1;
    const MultiThreadedCertVerifier::RequestParams& key2 = tests[i].key2;

    switch (tests[i].expected_result) {
      case -1:
        EXPECT_TRUE(key1 < key2);
        EXPECT_FALSE(key2 < key1);
        break;
      case 0:
        EXPECT_FALSE(key1 < key2);
        EXPECT_FALSE(key2 < key1);
        break;
      case 1:
        EXPECT_FALSE(key1 < key2);
        EXPECT_TRUE(key2 < key1);
        break;
      default:
        FAIL() << "Invalid expectation. Can be only -1, 0, 1";
    }
  }
}

TEST_F(MultiThreadedCertVerifierTest, CertTrustAnchorProvider) {
  MockCertTrustAnchorProvider trust_provider;
  verifier_.SetCertTrustAnchorProvider(&trust_provider);

  scoped_refptr<X509Certificate> test_cert(
      ImportCertFromFile(GetTestCertsDirectory(), "ok_cert.pem"));
  ASSERT_TRUE(test_cert.get());

  const CertificateList empty_cert_list;
  CertificateList cert_list;
  cert_list.push_back(test_cert);

  // Check that Verify() asks the |trust_provider| for the current list of
  // additional trust anchors.
  int error;
  CertVerifyResult verify_result;
  TestCompletionCallback callback;
  scoped_ptr<CertVerifier::Request> request;
  EXPECT_CALL(trust_provider, GetAdditionalTrustAnchors())
      .WillOnce(ReturnRef(empty_cert_list));
  error = verifier_.Verify(test_cert.get(), "www.example.com", std::string(), 0,
                           NULL, &verify_result, callback.callback(), &request,
                           BoundNetLog());
  Mock::VerifyAndClearExpectations(&trust_provider);
  ASSERT_EQ(ERR_IO_PENDING, error);
  EXPECT_TRUE(request);
  error = callback.WaitForResult();
  EXPECT_EQ(ERR_CERT_COMMON_NAME_INVALID, error);
  ASSERT_EQ(1u, verifier_.requests());
  ASSERT_EQ(0u, verifier_.cache_hits());

  // The next Verify() uses the cached result.
  EXPECT_CALL(trust_provider, GetAdditionalTrustAnchors())
      .WillOnce(ReturnRef(empty_cert_list));
  error = verifier_.Verify(test_cert.get(), "www.example.com", std::string(), 0,
                           NULL, &verify_result, callback.callback(), &request,
                           BoundNetLog());
  Mock::VerifyAndClearExpectations(&trust_provider);
  EXPECT_EQ(ERR_CERT_COMMON_NAME_INVALID, error);
  EXPECT_FALSE(request);
  ASSERT_EQ(2u, verifier_.requests());
  ASSERT_EQ(1u, verifier_.cache_hits());

  // Another Verify() for the same certificate but with a different list of
  // trust anchors will not reuse the cache.
  EXPECT_CALL(trust_provider, GetAdditionalTrustAnchors())
      .WillOnce(ReturnRef(cert_list));
  error = verifier_.Verify(test_cert.get(), "www.example.com", std::string(), 0,
                           NULL, &verify_result, callback.callback(), &request,
                           BoundNetLog());
  Mock::VerifyAndClearExpectations(&trust_provider);
  ASSERT_EQ(ERR_IO_PENDING, error);
  EXPECT_TRUE(request);
  error = callback.WaitForResult();
  EXPECT_EQ(ERR_CERT_COMMON_NAME_INVALID, error);
  ASSERT_EQ(3u, verifier_.requests());
  ASSERT_EQ(1u, verifier_.cache_hits());
}

// Tests de-duplication of requests.
// Starts up 5 requests, of which 3 are unique.
TEST_F(MultiThreadedCertVerifierTest, MultipleInflightJoin) {
  base::FilePath certs_dir = GetTestCertsDirectory();
  scoped_refptr<X509Certificate> test_cert(
      ImportCertFromFile(certs_dir, "ok_cert.pem"));
  ASSERT_NE(static_cast<X509Certificate*>(nullptr), test_cert.get());

  int error;
  CertVerifyResult verify_result1;
  TestCompletionCallback callback1;
  scoped_ptr<CertVerifier::Request> request1;
  CertVerifyResult verify_result2;
  TestCompletionCallback callback2;
  scoped_ptr<CertVerifier::Request> request2;
  CertVerifyResult verify_result3;
  TestCompletionCallback callback3;
  scoped_ptr<CertVerifier::Request> request3;
  CertVerifyResult verify_result4;
  TestCompletionCallback callback4;
  scoped_ptr<CertVerifier::Request> request4;
  CertVerifyResult verify_result5;
  TestCompletionCallback callback5;
  scoped_ptr<CertVerifier::Request> request5;

  const char domain1[] = "www.example1.com";
  const char domain2[] = "www.exampleB.com";
  const char domain3[] = "www.example3.com";

  // Start 3 unique requests.
  error = verifier_.Verify(test_cert.get(), domain2, std::string(), 0, nullptr,
                           &verify_result1, callback1.callback(), &request1,
                           BoundNetLog());
  ASSERT_EQ(ERR_IO_PENDING, error);
  EXPECT_TRUE(request1);

  error = verifier_.Verify(test_cert.get(), domain2, std::string(), 0, nullptr,
                           &verify_result2, callback2.callback(), &request2,
                           BoundNetLog());
  EXPECT_EQ(ERR_IO_PENDING, error);
  EXPECT_TRUE(request2);

  error = verifier_.Verify(test_cert.get(), domain3, std::string(), 0, nullptr,
                           &verify_result3, callback3.callback(), &request3,
                           BoundNetLog());
  EXPECT_EQ(ERR_IO_PENDING, error);
  EXPECT_TRUE(request3);

  // Start duplicate requests (which should join to existing jobs).
  error = verifier_.Verify(test_cert.get(), domain1, std::string(), 0, nullptr,
                           &verify_result4, callback4.callback(), &request4,
                           BoundNetLog());
  EXPECT_EQ(ERR_IO_PENDING, error);
  EXPECT_TRUE(request4);

  error = verifier_.Verify(test_cert.get(), domain2, std::string(), 0, nullptr,
                           &verify_result5, callback5.callback(), &request5,
                           BoundNetLog());
  EXPECT_EQ(ERR_IO_PENDING, error);
  EXPECT_TRUE(request5);

  error = callback1.WaitForResult();
  EXPECT_TRUE(IsCertificateError(error));
  error = callback2.WaitForResult();
  ASSERT_TRUE(IsCertificateError(error));
  error = callback4.WaitForResult();
  ASSERT_TRUE(IsCertificateError(error));

  // Let the other requests automatically cancel.
  ASSERT_EQ(5u, verifier_.requests());
  ASSERT_EQ(0u, verifier_.cache_hits());
  ASSERT_EQ(2u, verifier_.inflight_joins());
}

}  // namespace net