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// Copyright 2013 The Chromium Authors
// 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 <memory>
#include <string>
#include <string_view>
#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/net_errors.h"
#include "net/cert/ct_log_verifier.h"
#include "net/cert/ct_serialization.h"
#include "net/cert/sct_status_flags.h"
#include "net/cert/signed_certificate_timestamp.h"
#include "net/cert/signed_certificate_timestamp_and_status.h"
#include "net/cert/x509_certificate.h"
#include "net/log/net_log_source_type.h"
#include "net/log/net_log_with_source.h"
#include "net/log/test_net_log.h"
#include "net/log/test_net_log_util.h"
#include "net/test/cert_test_util.h"
#include "net/test/ct_test_util.h"
#include "net/test/test_data_directory.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
using testing::_;
using testing::Mock;
namespace net {
namespace {
const char kLogDescription[] = "somelog";
class MultiLogCTVerifierTest : public ::testing::Test {
public:
void SetUp() override {
scoped_refptr<const CTLogVerifier> log(
CTLogVerifier::Create(ct::GetTestPublicKey(), kLogDescription));
ASSERT_TRUE(log);
log_verifiers_.push_back(log);
verifier_ = std::make_unique<MultiLogCTVerifier>(log_verifiers_);
std::string der_test_cert(ct::GetDerEncodedX509Cert());
chain_ =
X509Certificate::CreateFromBytes(base::as_byte_span(der_test_cert));
ASSERT_TRUE(chain_.get());
embedded_sct_chain_ =
CreateCertificateChainFromFile(GetTestCertsDirectory(),
"ct-test-embedded-cert.pem",
X509Certificate::FORMAT_AUTO);
ASSERT_TRUE(embedded_sct_chain_.get());
}
bool CheckForEmbeddedSCTInNetLog(
const RecordingNetLogObserver& net_log_observer) {
auto entries = net_log_observer.GetEntries();
if (entries.size() != 2)
return false;
auto embedded_scts =
GetOptionalStringValueFromParams(entries[0], "embedded_scts");
if (!embedded_scts || embedded_scts->empty())
return false;
const NetLogEntry& parsed = entries[1];
if (parsed.params.empty()) {
return false;
}
const base::Value::List* scts = parsed.params.FindList("scts");
if (!scts || scts->size() != 1)
return false;
const base::Value& the_sct = (*scts)[0];
if (!the_sct.is_dict())
return false;
const std::string* origin = the_sct.GetDict().FindString("origin");
if (!origin || *origin != "Embedded in certificate")
return false;
const std::string* verification_status =
the_sct.GetDict().FindString("verification_status");
if (!verification_status || *verification_status != "Verified")
return false;
return true;
}
// Returns true if |chain| is a certificate with embedded SCTs that can be
// successfully extracted.
bool VerifySinglePrecertificateChain(scoped_refptr<X509Certificate> chain) {
SignedCertificateTimestampAndStatusList scts;
verifier_->Verify(chain.get(), std::string_view(), std::string_view(),
base::Time::Now(), &scts, NetLogWithSource());
return !scts.empty();
}
// Returns true if |chain| is a certificate with a single embedded SCT that
// can be successfully extracted and matched to the test log indicated by
// |kLogDescription|.
bool CheckPrecertificateVerification(scoped_refptr<X509Certificate> chain) {
SignedCertificateTimestampAndStatusList scts;
RecordingNetLogObserver net_log_observer(NetLogCaptureMode::kDefault);
NetLogWithSource net_log = NetLogWithSource::Make(
NetLog::Get(), NetLogSourceType::SSL_CONNECT_JOB);
verifier_->Verify(chain.get(), std::string_view(), std::string_view(),
base::Time::Now(), &scts, net_log);
return ct::CheckForSingleVerifiedSCTInResult(scts, kLogDescription) &&
ct::CheckForSCTOrigin(
scts, ct::SignedCertificateTimestamp::SCT_EMBEDDED) &&
CheckForEmbeddedSCTInNetLog(net_log_observer);
}
// Histogram-related helper methods
int GetValueFromHistogram(const std::string& histogram_name,
int sample_index) {
base::Histogram* histogram = static_cast<base::Histogram*>(
base::StatisticsRecorder::FindHistogram(histogram_name));
if (histogram == nullptr)
return 0;
std::unique_ptr<base::HistogramSamples> samples =
histogram->SnapshotSamples();
return samples->GetCount(sample_index);
}
int NumEmbeddedSCTsInHistogram() {
return GetValueFromHistogram("Net.CertificateTransparency.SCTOrigin",
ct::SignedCertificateTimestamp::SCT_EMBEDDED);
}
int NumValidSCTsInStatusHistogram() {
return GetValueFromHistogram("Net.CertificateTransparency.SCTStatus",
ct::SCT_STATUS_OK);
}
protected:
std::unique_ptr<MultiLogCTVerifier> verifier_;
scoped_refptr<X509Certificate> chain_;
scoped_refptr<X509Certificate> embedded_sct_chain_;
std::vector<scoped_refptr<const CTLogVerifier>> log_verifiers_;
};
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_list = ct::GetSCTListForTesting();
SignedCertificateTimestampAndStatusList scts;
verifier_->Verify(chain_.get(), std::string_view(), sct_list,
base::Time::Now(), &scts, NetLogWithSource());
ASSERT_TRUE(ct::CheckForSingleVerifiedSCTInResult(scts, kLogDescription));
ASSERT_TRUE(ct::CheckForSCTOrigin(
scts, ct::SignedCertificateTimestamp::SCT_FROM_TLS_EXTENSION));
}
TEST_F(MultiLogCTVerifierTest, IdentifiesSCTFromUnknownLog) {
std::string sct_list = ct::GetSCTListWithInvalidSCT();
SignedCertificateTimestampAndStatusList scts;
verifier_->Verify(chain_.get(), std::string_view(), sct_list,
base::Time::Now(), &scts, NetLogWithSource());
EXPECT_EQ(1U, scts.size());
EXPECT_EQ("", scts[0].sct->log_description);
EXPECT_EQ(ct::SCT_STATUS_LOG_UNKNOWN, scts[0].status);
}
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 = ct::GetSCTListWithInvalidSCT();
SignedCertificateTimestampAndStatusList scts;
int num_valid_scts = NumValidSCTsInStatusHistogram();
int num_invalid_scts = GetValueFromHistogram(
"Net.CertificateTransparency.SCTStatus", ct::SCT_STATUS_LOG_UNKNOWN);
verifier_->Verify(chain_.get(), std::string_view(), sct_list,
base::Time::Now(), &scts, NetLogWithSource());
ASSERT_EQ(num_valid_scts, NumValidSCTsInStatusHistogram());
ASSERT_EQ(num_invalid_scts + 1,
GetValueFromHistogram("Net.CertificateTransparency.SCTStatus",
ct::SCT_STATUS_LOG_UNKNOWN));
}
TEST_F(MultiLogCTVerifierTest, CountsSingleEmbeddedSCTInOriginsHistogram) {
int old_embedded_count = NumEmbeddedSCTsInHistogram();
ASSERT_TRUE(CheckPrecertificateVerification(embedded_sct_chain_));
EXPECT_EQ(old_embedded_count + 1, NumEmbeddedSCTsInHistogram());
}
} // namespace
} // namespace net
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