net/cert/multi_log_ct_verifier_unittest.cc - chromium/src.git - Git at Google

 // Copyright 2013 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_log_ct_verifier.h"

 #include <string>

 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/histogram_samples.h"
 #include "base/metrics/statistics_recorder.h"
 #include "base/values.h"
 #include "net/base/capturing_net_log.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_log.h"
 #include "net/base/test_data_directory.h"
 #include "net/cert/ct_log_verifier.h"
 #include "net/cert/ct_serialization.h"
 #include "net/cert/ct_verify_result.h"
 #include "net/cert/pem_tokenizer.h"
 #include "net/cert/sct_status_flags.h"
 #include "net/cert/signed_certificate_timestamp.h"
 #include "net/cert/x509_certificate.h"
 #include "net/test/cert_test_util.h"
 #include "net/test/ct_test_util.h"
 #include "testing/gtest/include/gtest/gtest.h"

 namespace net {

 namespace {

 const char kLogDescription[] = "somelog";
 const char kSCTCountHistogram[] =
     "Net.CertificateTransparency.SCTsPerConnection";

 class MultiLogCTVerifierTest : public ::testing::Test {
  public:
   virtual void SetUp() override {
     scoped_ptr<CTLogVerifier> log(
         CTLogVerifier::Create(ct::GetTestPublicKey(), kLogDescription));
     ASSERT_TRUE(log);

     verifier_.reset(new MultiLogCTVerifier());
     verifier_->AddLog(log.Pass());
     std::string der_test_cert(ct::GetDerEncodedX509Cert());
     chain_ = X509Certificate::CreateFromBytes(
         der_test_cert.data(),
         der_test_cert.length());
     ASSERT_TRUE(chain_.get());

     embedded_sct_chain_ =
         CreateCertificateChainFromFile(GetTestCertsDirectory(),
                                        "ct-test-embedded-cert.pem",
                                        X509Certificate::FORMAT_AUTO);
     ASSERT_TRUE(embedded_sct_chain_.get());
   }

   bool CheckForSingleVerifiedSCTInResult(const ct::CTVerifyResult& result) {
     return (result.verified_scts.size() == 1U) &&
         result.invalid_scts.empty() &&
         result.unknown_logs_scts.empty() &&
         result.verified_scts[0]->log_description == kLogDescription;
   }

   bool CheckForSCTOrigin(
       const ct::CTVerifyResult& result,
       ct::SignedCertificateTimestamp::Origin origin) {
     return (result.verified_scts.size() > 0) &&
         (result.verified_scts[0]->origin == origin);
   }

   bool CheckForEmbeddedSCTInNetLog(CapturingNetLog& net_log) {
     CapturingNetLog::CapturedEntryList entries;
     net_log.GetEntries(&entries);
     if (entries.size() != 2)
       return false;

     const CapturingNetLog::CapturedEntry& received = entries[0];
     std::string embedded_scts;
     if (!received.GetStringValue("embedded_scts", &embedded_scts))
       return false;
     if (embedded_scts.empty())
       return false;

     const CapturingNetLog::CapturedEntry& parsed = entries[1];
     base::ListValue* verified_scts;
     if (!parsed.GetListValue("verified_scts", &verified_scts) ||
         verified_scts->GetSize() != 1) {
       return false;
     }

     base::DictionaryValue* the_sct;
     if (!verified_scts->GetDictionary(0, &the_sct))
       return false;

     std::string origin;
     if (!the_sct->GetString("origin", &origin))
       return false;
     if (origin != "embedded_in_certificate")
       return false;

     base::ListValue* other_scts;
     if (!parsed.GetListValue("invalid_scts", &other_scts) ||
         !other_scts->empty()) {
       return false;
     }

     if (!parsed.GetListValue("unknown_logs_scts", &other_scts) ||
         !other_scts->empty()) {
       return false;
     }

     return true;
   }

   std::string GetSCTListWithInvalidSCT() {
     std::string sct(ct::GetTestSignedCertificateTimestamp());

     // Change a byte inside the Log ID part of the SCT so it does
     // not match the log used in the tests
     sct[15] = 't';

     std::string sct_list;
     ct::EncodeSCTListForTesting(sct, &sct_list);
     return sct_list;
   }

   bool VerifySinglePrecertificateChain(scoped_refptr<X509Certificate> chain,
                                        const BoundNetLog& bound_net_log,
                                        ct::CTVerifyResult* result) {
     return verifier_->Verify(chain.get(),
                              std::string(),
                              std::string(),
                              result,
                              bound_net_log) == OK;
   }

   bool VerifySinglePrecertificateChain(scoped_refptr<X509Certificate> chain) {
     ct::CTVerifyResult result;
     CapturingNetLog net_log;
     BoundNetLog bound_net_log =
         BoundNetLog::Make(&net_log, NetLog::SOURCE_CONNECT_JOB);

     return verifier_->Verify(chain.get(),
                              std::string(),
                              std::string(),
                              &result,
                              bound_net_log) == OK;
   }

   bool CheckPrecertificateVerification(scoped_refptr<X509Certificate> chain) {
     ct::CTVerifyResult result;
     CapturingNetLog net_log;
     BoundNetLog bound_net_log =
       BoundNetLog::Make(&net_log, NetLog::SOURCE_CONNECT_JOB);
     return (VerifySinglePrecertificateChain(chain, bound_net_log, &result) &&
             CheckForSingleVerifiedSCTInResult(result) &&
             CheckForSCTOrigin(result,
                               ct::SignedCertificateTimestamp::SCT_EMBEDDED) &&
             CheckForEmbeddedSCTInNetLog(net_log));
   }

   // Histogram-related helper methods
   int GetValueFromHistogram(std::string histogram_name, int sample_index) {
     base::Histogram* histogram = static_cast<base::Histogram*>(
         base::StatisticsRecorder::FindHistogram(histogram_name));

     if (histogram == NULL)
       return 0;

     scoped_ptr<base::HistogramSamples> samples = histogram->SnapshotSamples();
     return samples->GetCount(sample_index);
   }

   int NumConnectionsWithSingleSCT() {
     return GetValueFromHistogram(kSCTCountHistogram, 1);
   }

   int NumEmbeddedSCTsInHistogram() {
     return GetValueFromHistogram("Net.CertificateTransparency.SCTOrigin",
                                  ct::SignedCertificateTimestamp::SCT_EMBEDDED);
   }

   int NumValidSCTsInStatusHistogram() {
     return GetValueFromHistogram("Net.CertificateTransparency.SCTStatus",
                                  ct::SCT_STATUS_OK);
   }

  protected:
   scoped_ptr<MultiLogCTVerifier> verifier_;
   scoped_refptr<X509Certificate> chain_;
   scoped_refptr<X509Certificate> embedded_sct_chain_;
 };

 TEST_F(MultiLogCTVerifierTest, VerifiesEmbeddedSCT) {
   ASSERT_TRUE(CheckPrecertificateVerification(embedded_sct_chain_));
 }

 TEST_F(MultiLogCTVerifierTest, VerifiesEmbeddedSCTWithPreCA) {
   scoped_refptr<X509Certificate> chain(
       CreateCertificateChainFromFile(GetTestCertsDirectory(),
                                      "ct-test-embedded-with-preca-chain.pem",
                                      X509Certificate::FORMAT_AUTO));
   ASSERT_TRUE(chain.get());
   ASSERT_TRUE(CheckPrecertificateVerification(chain));
 }

 TEST_F(MultiLogCTVerifierTest, VerifiesEmbeddedSCTWithIntermediate) {
   scoped_refptr<X509Certificate> chain(CreateCertificateChainFromFile(
       GetTestCertsDirectory(),
       "ct-test-embedded-with-intermediate-chain.pem",
       X509Certificate::FORMAT_AUTO));
   ASSERT_TRUE(chain.get());
   ASSERT_TRUE(CheckPrecertificateVerification(chain));
 }

 TEST_F(MultiLogCTVerifierTest,
        VerifiesEmbeddedSCTWithIntermediateAndPreCA) {
   scoped_refptr<X509Certificate> chain(CreateCertificateChainFromFile(
       GetTestCertsDirectory(),
       "ct-test-embedded-with-intermediate-preca-chain.pem",
       X509Certificate::FORMAT_AUTO));
   ASSERT_TRUE(chain.get());
   ASSERT_TRUE(CheckPrecertificateVerification(chain));
 }

 TEST_F(MultiLogCTVerifierTest,
        VerifiesSCTOverX509Cert) {
   std::string sct(ct::GetTestSignedCertificateTimestamp());

   std::string sct_list;
   ASSERT_TRUE(ct::EncodeSCTListForTesting(sct, &sct_list));

   ct::CTVerifyResult result;
   EXPECT_EQ(OK,
             verifier_->Verify(
                 chain_.get(), std::string(), sct_list, &result, BoundNetLog()));
   ASSERT_TRUE(CheckForSingleVerifiedSCTInResult(result));
   ASSERT_TRUE(CheckForSCTOrigin(
       result, ct::SignedCertificateTimestamp::SCT_FROM_TLS_EXTENSION));
 }

 TEST_F(MultiLogCTVerifierTest,
        IdentifiesSCTFromUnknownLog) {
   std::string sct_list = GetSCTListWithInvalidSCT();
   ct::CTVerifyResult result;

   EXPECT_NE(OK,
             verifier_->Verify(
                 chain_.get(), std::string(), sct_list, &result, BoundNetLog()));
   EXPECT_EQ(1U, result.unknown_logs_scts.size());
   EXPECT_EQ("", result.unknown_logs_scts[0]->log_description);
 }

 TEST_F(MultiLogCTVerifierTest, CountsValidSCTsInStatusHistogram) {
   int num_valid_scts = NumValidSCTsInStatusHistogram();

   ASSERT_TRUE(VerifySinglePrecertificateChain(embedded_sct_chain_));

   EXPECT_EQ(num_valid_scts + 1, NumValidSCTsInStatusHistogram());
 }

 TEST_F(MultiLogCTVerifierTest, CountsInvalidSCTsInStatusHistogram) {
   std::string sct_list = GetSCTListWithInvalidSCT();
   ct::CTVerifyResult result;
   int num_valid_scts = NumValidSCTsInStatusHistogram();
   int num_invalid_scts = GetValueFromHistogram(
       "Net.CertificateTransparency.SCTStatus", ct::SCT_STATUS_LOG_UNKNOWN);

   EXPECT_NE(OK,
             verifier_->Verify(
                 chain_.get(), std::string(), sct_list, &result, BoundNetLog()));

   ASSERT_EQ(num_valid_scts, NumValidSCTsInStatusHistogram());
   ASSERT_EQ(num_invalid_scts + 1,
             GetValueFromHistogram("Net.CertificateTransparency.SCTStatus",
                                   ct::SCT_STATUS_LOG_UNKNOWN));
 }

 TEST_F(MultiLogCTVerifierTest, CountsSingleEmbeddedSCTInConnectionsHistogram) {
   int old_sct_count = NumConnectionsWithSingleSCT();
   ASSERT_TRUE(CheckPrecertificateVerification(embedded_sct_chain_));
   EXPECT_EQ(old_sct_count + 1, NumConnectionsWithSingleSCT());
 }

 TEST_F(MultiLogCTVerifierTest, CountsSingleEmbeddedSCTInOriginsHistogram) {
   int old_embedded_count = NumEmbeddedSCTsInHistogram();
   ASSERT_TRUE(CheckPrecertificateVerification(embedded_sct_chain_));
   EXPECT_EQ(old_embedded_count + 1, NumEmbeddedSCTsInHistogram());
 }

 TEST_F(MultiLogCTVerifierTest, CountsZeroSCTsCorrectly) {
   int connections_without_scts = GetValueFromHistogram(kSCTCountHistogram, 0);
   EXPECT_FALSE(VerifySinglePrecertificateChain(chain_));
   ASSERT_EQ(connections_without_scts + 1,
             GetValueFromHistogram(kSCTCountHistogram, 0));
 }

 }  // namespace

 }  // namespace net
	// Copyright 2013 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_log_ct_verifier.h"

	#include <string>

	#include "base/files/file_path.h"
	#include "base/files/file_util.h"
	#include "base/metrics/histogram.h"
	#include "base/metrics/histogram_samples.h"
	#include "base/metrics/statistics_recorder.h"
	#include "base/values.h"
	#include "net/base/capturing_net_log.h"
	#include "net/base/net_errors.h"
	#include "net/base/net_log.h"
	#include "net/base/test_data_directory.h"
	#include "net/cert/ct_log_verifier.h"
	#include "net/cert/ct_serialization.h"
	#include "net/cert/ct_verify_result.h"
	#include "net/cert/pem_tokenizer.h"
	#include "net/cert/sct_status_flags.h"
	#include "net/cert/signed_certificate_timestamp.h"
	#include "net/cert/x509_certificate.h"
	#include "net/test/cert_test_util.h"
	#include "net/test/ct_test_util.h"
	#include "testing/gtest/include/gtest/gtest.h"

	namespace net {

	namespace {

	const char kLogDescription[] = "somelog";
	const char kSCTCountHistogram[] =
	"Net.CertificateTransparency.SCTsPerConnection";

	class MultiLogCTVerifierTest : public ::testing::Test {
	public:
	virtual void SetUp() override {
	scoped_ptr<CTLogVerifier> log(
	CTLogVerifier::Create(ct::GetTestPublicKey(), kLogDescription));
	ASSERT_TRUE(log);

	verifier_.reset(new MultiLogCTVerifier());
	verifier_->AddLog(log.Pass());
	std::string der_test_cert(ct::GetDerEncodedX509Cert());
	chain_ = X509Certificate::CreateFromBytes(
	der_test_cert.data(),
	der_test_cert.length());
	ASSERT_TRUE(chain_.get());

	embedded_sct_chain_ =
	CreateCertificateChainFromFile(GetTestCertsDirectory(),
	"ct-test-embedded-cert.pem",
	X509Certificate::FORMAT_AUTO);
	ASSERT_TRUE(embedded_sct_chain_.get());
	}

	bool CheckForSingleVerifiedSCTInResult(const ct::CTVerifyResult& result) {
	return (result.verified_scts.size() == 1U) &&
	result.invalid_scts.empty() &&
	result.unknown_logs_scts.empty() &&
	result.verified_scts[0]->log_description == kLogDescription;
	}

	bool CheckForSCTOrigin(
	const ct::CTVerifyResult& result,
	ct::SignedCertificateTimestamp::Origin origin) {
	return (result.verified_scts.size() > 0) &&
	(result.verified_scts[0]->origin == origin);
	}

	bool CheckForEmbeddedSCTInNetLog(CapturingNetLog& net_log) {
	CapturingNetLog::CapturedEntryList entries;
	net_log.GetEntries(&entries);
	if (entries.size() != 2)
	return false;

	const CapturingNetLog::CapturedEntry& received = entries[0];
	std::string embedded_scts;
	if (!received.GetStringValue("embedded_scts", &embedded_scts))
	return false;
	if (embedded_scts.empty())
	return false;

	const CapturingNetLog::CapturedEntry& parsed = entries[1];
	base::ListValue* verified_scts;
	if (!parsed.GetListValue("verified_scts", &verified_scts) \|\|
	verified_scts->GetSize() != 1) {
	return false;
	}

	base::DictionaryValue* the_sct;
	if (!verified_scts->GetDictionary(0, &the_sct))
	return false;

	std::string origin;
	if (!the_sct->GetString("origin", &origin))
	return false;
	if (origin != "embedded_in_certificate")
	return false;

	base::ListValue* other_scts;
	if (!parsed.GetListValue("invalid_scts", &other_scts) \|\|
	!other_scts->empty()) {
	return false;
	}

	if (!parsed.GetListValue("unknown_logs_scts", &other_scts) \|\|
	!other_scts->empty()) {
	return false;
	}

	return true;
	}

	std::string GetSCTListWithInvalidSCT() {
	std::string sct(ct::GetTestSignedCertificateTimestamp());

	// Change a byte inside the Log ID part of the SCT so it does
	// not match the log used in the tests
	sct[15] = 't';

	std::string sct_list;
	ct::EncodeSCTListForTesting(sct, &sct_list);
	return sct_list;
	}

	bool VerifySinglePrecertificateChain(scoped_refptr<X509Certificate> chain,
	const BoundNetLog& bound_net_log,
	ct::CTVerifyResult* result) {
	return verifier_->Verify(chain.get(),
	std::string(),
	std::string(),
	result,
	bound_net_log) == OK;
	}

	bool VerifySinglePrecertificateChain(scoped_refptr<X509Certificate> chain) {
	ct::CTVerifyResult result;
	CapturingNetLog net_log;
	BoundNetLog bound_net_log =
	BoundNetLog::Make(&net_log, NetLog::SOURCE_CONNECT_JOB);

	return verifier_->Verify(chain.get(),
	std::string(),
	std::string(),
	&result,
	bound_net_log) == OK;
	}

	bool CheckPrecertificateVerification(scoped_refptr<X509Certificate> chain) {
	ct::CTVerifyResult result;
	CapturingNetLog net_log;
	BoundNetLog bound_net_log =
	BoundNetLog::Make(&net_log, NetLog::SOURCE_CONNECT_JOB);
	return (VerifySinglePrecertificateChain(chain, bound_net_log, &result) &&
	CheckForSingleVerifiedSCTInResult(result) &&
	CheckForSCTOrigin(result,
	ct::SignedCertificateTimestamp::SCT_EMBEDDED) &&
	CheckForEmbeddedSCTInNetLog(net_log));
	}

	// Histogram-related helper methods
	int GetValueFromHistogram(std::string histogram_name, int sample_index) {
	base::Histogram* histogram = static_cast<base::Histogram*>(
	base::StatisticsRecorder::FindHistogram(histogram_name));

	if (histogram == NULL)
	return 0;

	scoped_ptr<base::HistogramSamples> samples = histogram->SnapshotSamples();
	return samples->GetCount(sample_index);
	}

	int NumConnectionsWithSingleSCT() {
	return GetValueFromHistogram(kSCTCountHistogram, 1);
	}

	int NumEmbeddedSCTsInHistogram() {
	return GetValueFromHistogram("Net.CertificateTransparency.SCTOrigin",
	ct::SignedCertificateTimestamp::SCT_EMBEDDED);
	}

	int NumValidSCTsInStatusHistogram() {
	return GetValueFromHistogram("Net.CertificateTransparency.SCTStatus",
	ct::SCT_STATUS_OK);
	}

	protected:
	scoped_ptr<MultiLogCTVerifier> verifier_;
	scoped_refptr<X509Certificate> chain_;
	scoped_refptr<X509Certificate> embedded_sct_chain_;
	};

	TEST_F(MultiLogCTVerifierTest, VerifiesEmbeddedSCT) {
	ASSERT_TRUE(CheckPrecertificateVerification(embedded_sct_chain_));
	}

	TEST_F(MultiLogCTVerifierTest, VerifiesEmbeddedSCTWithPreCA) {
	scoped_refptr<X509Certificate> chain(
	CreateCertificateChainFromFile(GetTestCertsDirectory(),
	"ct-test-embedded-with-preca-chain.pem",
	X509Certificate::FORMAT_AUTO));
	ASSERT_TRUE(chain.get());
	ASSERT_TRUE(CheckPrecertificateVerification(chain));
	}

	TEST_F(MultiLogCTVerifierTest, VerifiesEmbeddedSCTWithIntermediate) {
	scoped_refptr<X509Certificate> chain(CreateCertificateChainFromFile(
	GetTestCertsDirectory(),
	"ct-test-embedded-with-intermediate-chain.pem",
	X509Certificate::FORMAT_AUTO));
	ASSERT_TRUE(chain.get());
	ASSERT_TRUE(CheckPrecertificateVerification(chain));
	}

	TEST_F(MultiLogCTVerifierTest,
	VerifiesEmbeddedSCTWithIntermediateAndPreCA) {
	scoped_refptr<X509Certificate> chain(CreateCertificateChainFromFile(
	GetTestCertsDirectory(),
	"ct-test-embedded-with-intermediate-preca-chain.pem",
	X509Certificate::FORMAT_AUTO));
	ASSERT_TRUE(chain.get());
	ASSERT_TRUE(CheckPrecertificateVerification(chain));
	}

	TEST_F(MultiLogCTVerifierTest,
	VerifiesSCTOverX509Cert) {
	std::string sct(ct::GetTestSignedCertificateTimestamp());

	std::string sct_list;
	ASSERT_TRUE(ct::EncodeSCTListForTesting(sct, &sct_list));

	ct::CTVerifyResult result;
	EXPECT_EQ(OK,
	verifier_->Verify(
	chain_.get(), std::string(), sct_list, &result, BoundNetLog()));
	ASSERT_TRUE(CheckForSingleVerifiedSCTInResult(result));
	ASSERT_TRUE(CheckForSCTOrigin(
	result, ct::SignedCertificateTimestamp::SCT_FROM_TLS_EXTENSION));
	}

	TEST_F(MultiLogCTVerifierTest,
	IdentifiesSCTFromUnknownLog) {
	std::string sct_list = GetSCTListWithInvalidSCT();
	ct::CTVerifyResult result;

	EXPECT_NE(OK,
	verifier_->Verify(
	chain_.get(), std::string(), sct_list, &result, BoundNetLog()));
	EXPECT_EQ(1U, result.unknown_logs_scts.size());
	EXPECT_EQ("", result.unknown_logs_scts[0]->log_description);
	}

	TEST_F(MultiLogCTVerifierTest, CountsValidSCTsInStatusHistogram) {
	int num_valid_scts = NumValidSCTsInStatusHistogram();

	ASSERT_TRUE(VerifySinglePrecertificateChain(embedded_sct_chain_));

	EXPECT_EQ(num_valid_scts + 1, NumValidSCTsInStatusHistogram());
	}

	TEST_F(MultiLogCTVerifierTest, CountsInvalidSCTsInStatusHistogram) {
	std::string sct_list = GetSCTListWithInvalidSCT();
	ct::CTVerifyResult result;
	int num_valid_scts = NumValidSCTsInStatusHistogram();
	int num_invalid_scts = GetValueFromHistogram(
	"Net.CertificateTransparency.SCTStatus", ct::SCT_STATUS_LOG_UNKNOWN);

	EXPECT_NE(OK,
	verifier_->Verify(
	chain_.get(), std::string(), sct_list, &result, BoundNetLog()));

	ASSERT_EQ(num_valid_scts, NumValidSCTsInStatusHistogram());
	ASSERT_EQ(num_invalid_scts + 1,
	GetValueFromHistogram("Net.CertificateTransparency.SCTStatus",
	ct::SCT_STATUS_LOG_UNKNOWN));
	}

	TEST_F(MultiLogCTVerifierTest, CountsSingleEmbeddedSCTInConnectionsHistogram) {
	int old_sct_count = NumConnectionsWithSingleSCT();
	ASSERT_TRUE(CheckPrecertificateVerification(embedded_sct_chain_));
	EXPECT_EQ(old_sct_count + 1, NumConnectionsWithSingleSCT());
	}

	TEST_F(MultiLogCTVerifierTest, CountsSingleEmbeddedSCTInOriginsHistogram) {
	int old_embedded_count = NumEmbeddedSCTsInHistogram();
	ASSERT_TRUE(CheckPrecertificateVerification(embedded_sct_chain_));
	EXPECT_EQ(old_embedded_count + 1, NumEmbeddedSCTsInHistogram());
	}

	TEST_F(MultiLogCTVerifierTest, CountsZeroSCTsCorrectly) {
	int connections_without_scts = GetValueFromHistogram(kSCTCountHistogram, 0);
	EXPECT_FALSE(VerifySinglePrecertificateChain(chain_));
	ASSERT_EQ(connections_without_scts + 1,
	GetValueFromHistogram(kSCTCountHistogram, 0));
	}

	} // namespace

	} // namespace net