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// 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/ct_objects_extractor.h"
#include "base/files/file_path.h"
#include "net/base/test_data_directory.h"
#include "net/cert/ct_log_verifier.h"
#include "net/cert/ct_serialization.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 ct {
class CTObjectsExtractorTest : public ::testing::Test {
public:
void SetUp() override {
precert_chain_ =
CreateCertificateListFromFile(GetTestCertsDirectory(),
"ct-test-embedded-cert.pem",
X509Certificate::FORMAT_AUTO);
ASSERT_EQ(2u, precert_chain_.size());
std::string der_test_cert(ct::GetDerEncodedX509Cert());
test_cert_ = X509Certificate::CreateFromBytes(der_test_cert.data(),
der_test_cert.length());
log_ = CTLogVerifier::Create(ct::GetTestPublicKey(), "testlog",
"https://ct.example.com");
ASSERT_TRUE(log_);
}
void ExtractEmbeddedSCT(scoped_refptr<X509Certificate> cert,
scoped_refptr<SignedCertificateTimestamp>* sct) {
std::string sct_list;
EXPECT_TRUE(ExtractEmbeddedSCTList(cert->os_cert_handle(), &sct_list));
std::vector<base::StringPiece> parsed_scts;
base::StringPiece sct_list_sp(sct_list);
// Make sure the SCT list can be decoded properly
EXPECT_TRUE(DecodeSCTList(&sct_list_sp, &parsed_scts));
EXPECT_TRUE(DecodeSignedCertificateTimestamp(&parsed_scts[0], sct));
}
protected:
CertificateList precert_chain_;
scoped_refptr<X509Certificate> test_cert_;
scoped_refptr<const CTLogVerifier> log_;
};
// Test that an SCT can be extracted and the extracted SCT contains the
// expected data.
TEST_F(CTObjectsExtractorTest, ExtractEmbeddedSCT) {
scoped_refptr<ct::SignedCertificateTimestamp> sct(
new ct::SignedCertificateTimestamp());
ExtractEmbeddedSCT(precert_chain_[0], &sct);
EXPECT_EQ(sct->version, SignedCertificateTimestamp::SCT_VERSION_1);
EXPECT_EQ(ct::GetTestPublicKeyId(), sct->log_id);
base::Time expected_timestamp =
base::Time::UnixEpoch() +
base::TimeDelta::FromMilliseconds(1365181456275);
EXPECT_EQ(expected_timestamp, sct->timestamp);
}
TEST_F(CTObjectsExtractorTest, ExtractPrecert) {
LogEntry entry;
ASSERT_TRUE(GetPrecertLogEntry(precert_chain_[0]->os_cert_handle(),
precert_chain_[1]->os_cert_handle(),
&entry));
ASSERT_EQ(ct::LogEntry::LOG_ENTRY_TYPE_PRECERT, entry.type);
// Should have empty leaf cert for this log entry type.
ASSERT_TRUE(entry.leaf_certificate.empty());
// Compare hash values of issuer spki.
SHA256HashValue expected_issuer_key_hash;
memcpy(expected_issuer_key_hash.data, GetDefaultIssuerKeyHash().data(), 32);
ASSERT_TRUE(expected_issuer_key_hash.Equals(entry.issuer_key_hash));
}
TEST_F(CTObjectsExtractorTest, ExtractOrdinaryX509Cert) {
LogEntry entry;
ASSERT_TRUE(GetX509LogEntry(test_cert_->os_cert_handle(), &entry));
ASSERT_EQ(ct::LogEntry::LOG_ENTRY_TYPE_X509, entry.type);
// Should have empty tbs_certificate for this log entry type.
ASSERT_TRUE(entry.tbs_certificate.empty());
// Length of leaf_certificate should be 718, see the CT Serialization tests.
ASSERT_EQ(718U, entry.leaf_certificate.size());
}
// Test that the embedded SCT verifies
TEST_F(CTObjectsExtractorTest, ExtractedSCTVerifies) {
scoped_refptr<ct::SignedCertificateTimestamp> sct(
new ct::SignedCertificateTimestamp());
ExtractEmbeddedSCT(precert_chain_[0], &sct);
LogEntry entry;
ASSERT_TRUE(GetPrecertLogEntry(precert_chain_[0]->os_cert_handle(),
precert_chain_[1]->os_cert_handle(),
&entry));
EXPECT_TRUE(log_->Verify(entry, *sct.get()));
}
// Test that an externally-provided SCT verifies over the LogEntry
// of a regular X.509 Certificate
TEST_F(CTObjectsExtractorTest, ComplementarySCTVerifies) {
scoped_refptr<ct::SignedCertificateTimestamp> sct(
new ct::SignedCertificateTimestamp());
GetX509CertSCT(&sct);
LogEntry entry;
ASSERT_TRUE(GetX509LogEntry(test_cert_->os_cert_handle(), &entry));
EXPECT_TRUE(log_->Verify(entry, *sct.get()));
}
// Test that the extractor can parse OCSP responses.
TEST_F(CTObjectsExtractorTest, ExtractSCTListFromOCSPResponse) {
std::string der_subject_cert(ct::GetDerEncodedFakeOCSPResponseCert());
scoped_refptr<X509Certificate> subject_cert =
X509Certificate::CreateFromBytes(der_subject_cert.data(),
der_subject_cert.length());
std::string der_issuer_cert(ct::GetDerEncodedFakeOCSPResponseIssuerCert());
scoped_refptr<X509Certificate> issuer_cert =
X509Certificate::CreateFromBytes(der_issuer_cert.data(),
der_issuer_cert.length());
std::string fake_sct_list = ct::GetFakeOCSPExtensionValue();
ASSERT_FALSE(fake_sct_list.empty());
std::string ocsp_response = ct::GetDerEncodedFakeOCSPResponse();
std::string extracted_sct_list;
EXPECT_TRUE(ct::ExtractSCTListFromOCSPResponse(
issuer_cert->os_cert_handle(), subject_cert->serial_number(),
ocsp_response, &extracted_sct_list));
EXPECT_EQ(extracted_sct_list, fake_sct_list);
}
// Test that the extractor honours serial number.
TEST_F(CTObjectsExtractorTest, ExtractSCTListFromOCSPResponseMatchesSerial) {
std::string der_issuer_cert(ct::GetDerEncodedFakeOCSPResponseIssuerCert());
scoped_refptr<X509Certificate> issuer_cert =
X509Certificate::CreateFromBytes(der_issuer_cert.data(),
der_issuer_cert.length());
std::string ocsp_response = ct::GetDerEncodedFakeOCSPResponse();
std::string extracted_sct_list;
EXPECT_FALSE(ct::ExtractSCTListFromOCSPResponse(
issuer_cert->os_cert_handle(), test_cert_->serial_number(),
ocsp_response, &extracted_sct_list));
}
// Test that the extractor honours issuer ID.
TEST_F(CTObjectsExtractorTest, ExtractSCTListFromOCSPResponseMatchesIssuer) {
std::string der_subject_cert(ct::GetDerEncodedFakeOCSPResponseCert());
scoped_refptr<X509Certificate> subject_cert =
X509Certificate::CreateFromBytes(der_subject_cert.data(),
der_subject_cert.length());
std::string ocsp_response = ct::GetDerEncodedFakeOCSPResponse();
std::string extracted_sct_list;
// Use test_cert_ for issuer - it is not the correct issuer of |subject_cert|.
EXPECT_FALSE(ct::ExtractSCTListFromOCSPResponse(
test_cert_->os_cert_handle(), subject_cert->serial_number(),
ocsp_response, &extracted_sct_list));
}
} // namespace ct
} // namespace net
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