| // 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/certificate_transparency/chrome_ct_policy_enforcer.h" |
| |
| #include <memory> |
| #include <string> |
| |
| #include "base/stl_util.h" |
| #include "base/time/time.h" |
| #include "base/version.h" |
| #include "crypto/rsa_private_key.h" |
| #include "crypto/sha2.h" |
| #include "net/cert/ct_policy_status.h" |
| #include "net/cert/ct_verify_result.h" |
| #include "net/cert/x509_certificate.h" |
| #include "net/cert/x509_util.h" |
| #include "net/log/net_log_with_source.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 net::ct::CTPolicyCompliance; |
| using net::ct::SCTList; |
| using net::ct::SignedCertificateTimestamp; |
| using net::NetLogWithSource; |
| using net::X509Certificate; |
| |
| namespace certificate_transparency { |
| |
| namespace { |
| |
| const char kGoogleAviatorLogID[] = |
| "\x68\xf6\x98\xf8\x1f\x64\x82\xbe\x3a\x8c\xee\xb9\x28\x1d\x4c\xfc\x71\x51" |
| "\x5d\x67\x93\xd4\x44\xd1\x0a\x67\xac\xbb\x4f\x4f\xfb\xc4"; |
| static_assert(base::size(kGoogleAviatorLogID) - 1 == crypto::kSHA256Length, |
| "Incorrect log ID length."); |
| |
| class ChromeCTPolicyEnforcerTest : public ::testing::Test { |
| public: |
| void SetUp() override { |
| policy_enforcer_.reset(new ChromeCTPolicyEnforcer); |
| |
| std::string der_test_cert(net::ct::GetDerEncodedX509Cert()); |
| chain_ = X509Certificate::CreateFromBytes(der_test_cert.data(), |
| der_test_cert.size()); |
| ASSERT_TRUE(chain_.get()); |
| google_log_id_ = std::string(kGoogleAviatorLogID, crypto::kSHA256Length); |
| non_google_log_id_.assign(crypto::kSHA256Length, 1); |
| } |
| |
| void FillListWithSCTsOfOrigin( |
| SignedCertificateTimestamp::Origin desired_origin, |
| size_t num_scts, |
| const std::vector<std::string>& desired_log_keys, |
| bool timestamp_past_enforcement_date, |
| SCTList* verified_scts) { |
| for (size_t i = 0; i < num_scts; ++i) { |
| scoped_refptr<SignedCertificateTimestamp> sct( |
| new SignedCertificateTimestamp()); |
| sct->origin = desired_origin; |
| if (i < desired_log_keys.size()) |
| sct->log_id = desired_log_keys[i]; |
| else |
| sct->log_id = std::string(crypto::kSHA256Length, static_cast<char>(i)); |
| |
| if (timestamp_past_enforcement_date) { |
| EXPECT_TRUE(base::Time::FromUTCExploded({2015, 8, 0, 15, 0, 0, 0, 0}, |
| &sct->timestamp)); |
| } else { |
| EXPECT_TRUE(base::Time::FromUTCExploded({2015, 6, 0, 15, 0, 0, 0, 0}, |
| &sct->timestamp)); |
| } |
| |
| verified_scts->push_back(sct); |
| } |
| } |
| |
| void AddDisqualifiedLogSCT(SignedCertificateTimestamp::Origin desired_origin, |
| bool timestamp_after_disqualification_date, |
| SCTList* verified_scts) { |
| static const char kCertlyLogID[] = |
| "\xcd\xb5\x17\x9b\x7f\xc1\xc0\x46\xfe\xea\x31\x13\x6a\x3f\x8f\x00\x2e" |
| "\x61\x82\xfa\xf8\x89\x6f\xec\xc8\xb2\xf5\xb5\xab\x60\x49\x00"; |
| static_assert(base::size(kCertlyLogID) - 1 == crypto::kSHA256Length, |
| "Incorrect log ID length."); |
| |
| scoped_refptr<SignedCertificateTimestamp> sct( |
| new SignedCertificateTimestamp()); |
| sct->origin = desired_origin; |
| sct->log_id = std::string(kCertlyLogID, crypto::kSHA256Length); |
| if (timestamp_after_disqualification_date) { |
| EXPECT_TRUE(base::Time::FromUTCExploded({2016, 4, 0, 16, 0, 0, 0, 0}, |
| &sct->timestamp)); |
| } else { |
| EXPECT_TRUE(base::Time::FromUTCExploded({2016, 4, 0, 1, 0, 0, 0, 0}, |
| &sct->timestamp)); |
| } |
| |
| verified_scts->push_back(sct); |
| } |
| |
| void FillListWithSCTsOfOrigin( |
| SignedCertificateTimestamp::Origin desired_origin, |
| size_t num_scts, |
| SCTList* verified_scts) { |
| std::vector<std::string> desired_log_ids; |
| desired_log_ids.push_back(google_log_id_); |
| FillListWithSCTsOfOrigin(desired_origin, num_scts, desired_log_ids, true, |
| verified_scts); |
| } |
| |
| base::Time CreateTime(const base::Time::Exploded& exploded) { |
| base::Time result; |
| if (!base::Time::FromUTCExploded(exploded, &result)) { |
| ADD_FAILURE() << "Failed FromUTCExploded"; |
| } |
| return result; |
| } |
| |
| protected: |
| std::unique_ptr<net::CTPolicyEnforcer> policy_enforcer_; |
| scoped_refptr<X509Certificate> chain_; |
| std::string google_log_id_; |
| std::string non_google_log_id_; |
| }; |
| |
| TEST_F(ChromeCTPolicyEnforcerTest, |
| DoesNotConformToCTPolicyNotEnoughDiverseSCTsAllGoogle) { |
| SCTList scts; |
| std::vector<std::string> desired_log_ids(2, google_log_id_); |
| |
| FillListWithSCTsOfOrigin(SignedCertificateTimestamp::SCT_FROM_TLS_EXTENSION, |
| desired_log_ids.size(), desired_log_ids, true, |
| &scts); |
| |
| EXPECT_EQ(CTPolicyCompliance::CT_POLICY_NOT_DIVERSE_SCTS, |
| policy_enforcer_->CheckCompliance(chain_.get(), scts, |
| NetLogWithSource())); |
| } |
| |
| TEST_F(ChromeCTPolicyEnforcerTest, |
| DoesNotConformToCTPolicyNotEnoughDiverseSCTsAllNonGoogle) { |
| SCTList scts; |
| std::vector<std::string> desired_log_ids(2, non_google_log_id_); |
| |
| FillListWithSCTsOfOrigin(SignedCertificateTimestamp::SCT_FROM_TLS_EXTENSION, |
| desired_log_ids.size(), desired_log_ids, true, |
| &scts); |
| |
| EXPECT_EQ(CTPolicyCompliance::CT_POLICY_NOT_DIVERSE_SCTS, |
| policy_enforcer_->CheckCompliance(chain_.get(), scts, |
| NetLogWithSource())); |
| } |
| |
| TEST_F(ChromeCTPolicyEnforcerTest, |
| ConformsToCTPolicyIfSCTBeforeEnforcementDate) { |
| SCTList scts; |
| // |chain_| is valid for 10 years - over 121 months - so requires 5 SCTs. |
| // All 5 SCTs will be from non-Google logs. |
| FillListWithSCTsOfOrigin(SignedCertificateTimestamp::SCT_EMBEDDED, 5, |
| std::vector<std::string>(), false, &scts); |
| |
| EXPECT_EQ(CTPolicyCompliance::CT_POLICY_COMPLIES_VIA_SCTS, |
| policy_enforcer_->CheckCompliance(chain_.get(), scts, |
| NetLogWithSource())); |
| } |
| |
| TEST_F(ChromeCTPolicyEnforcerTest, ConformsToCTPolicyWithNonEmbeddedSCTs) { |
| SCTList scts; |
| FillListWithSCTsOfOrigin(SignedCertificateTimestamp::SCT_FROM_TLS_EXTENSION, |
| 2, &scts); |
| |
| EXPECT_EQ(CTPolicyCompliance::CT_POLICY_COMPLIES_VIA_SCTS, |
| policy_enforcer_->CheckCompliance(chain_.get(), scts, |
| NetLogWithSource())); |
| } |
| |
| TEST_F(ChromeCTPolicyEnforcerTest, ConformsToCTPolicyWithEmbeddedSCTs) { |
| // |chain_| is valid for 10 years - over 121 months - so requires 5 SCTs. |
| SCTList scts; |
| FillListWithSCTsOfOrigin(SignedCertificateTimestamp::SCT_EMBEDDED, 5, &scts); |
| |
| EXPECT_EQ(CTPolicyCompliance::CT_POLICY_COMPLIES_VIA_SCTS, |
| policy_enforcer_->CheckCompliance(chain_.get(), scts, |
| NetLogWithSource())); |
| } |
| |
| TEST_F(ChromeCTPolicyEnforcerTest, |
| ConformsToCTPolicyWithPooledNonEmbeddedSCTs) { |
| SCTList scts; |
| std::vector<std::string> desired_logs; |
| |
| // One Google log, delivered via OCSP. |
| desired_logs.clear(); |
| desired_logs.push_back(google_log_id_); |
| FillListWithSCTsOfOrigin(SignedCertificateTimestamp::SCT_FROM_OCSP_RESPONSE, |
| desired_logs.size(), desired_logs, true, &scts); |
| |
| // One non-Google log, delivered via TLS. |
| desired_logs.clear(); |
| desired_logs.push_back(non_google_log_id_); |
| FillListWithSCTsOfOrigin(SignedCertificateTimestamp::SCT_FROM_TLS_EXTENSION, |
| desired_logs.size(), desired_logs, true, &scts); |
| |
| EXPECT_EQ(CTPolicyCompliance::CT_POLICY_COMPLIES_VIA_SCTS, |
| policy_enforcer_->CheckCompliance(chain_.get(), scts, |
| NetLogWithSource())); |
| } |
| |
| TEST_F(ChromeCTPolicyEnforcerTest, ConformsToCTPolicyWithPooledEmbeddedSCTs) { |
| SCTList scts; |
| std::vector<std::string> desired_logs; |
| |
| // One Google log, delivered embedded. |
| desired_logs.clear(); |
| desired_logs.push_back(google_log_id_); |
| FillListWithSCTsOfOrigin(SignedCertificateTimestamp::SCT_EMBEDDED, |
| desired_logs.size(), desired_logs, true, &scts); |
| |
| // One non-Google log, delivered via OCSP. |
| desired_logs.clear(); |
| desired_logs.push_back(non_google_log_id_); |
| FillListWithSCTsOfOrigin(SignedCertificateTimestamp::SCT_FROM_OCSP_RESPONSE, |
| desired_logs.size(), desired_logs, true, &scts); |
| |
| EXPECT_EQ(CTPolicyCompliance::CT_POLICY_COMPLIES_VIA_SCTS, |
| policy_enforcer_->CheckCompliance(chain_.get(), scts, |
| NetLogWithSource())); |
| } |
| |
| TEST_F(ChromeCTPolicyEnforcerTest, DoesNotConformToCTPolicyNotEnoughSCTs) { |
| // |chain_| is valid for 10 years - over 121 months - so requires 5 SCTs. |
| SCTList scts; |
| FillListWithSCTsOfOrigin(SignedCertificateTimestamp::SCT_EMBEDDED, 2, &scts); |
| |
| EXPECT_EQ(CTPolicyCompliance::CT_POLICY_NOT_ENOUGH_SCTS, |
| policy_enforcer_->CheckCompliance(chain_.get(), scts, |
| NetLogWithSource())); |
| } |
| |
| TEST_F(ChromeCTPolicyEnforcerTest, DoesNotConformToCTPolicyNotEnoughFreshSCTs) { |
| SCTList scts; |
| |
| // The results should be the same before and after disqualification, |
| // regardless of the delivery method. |
| |
| // SCT from before disqualification. |
| scts.clear(); |
| FillListWithSCTsOfOrigin(SignedCertificateTimestamp::SCT_FROM_TLS_EXTENSION, |
| 1, &scts); |
| AddDisqualifiedLogSCT(SignedCertificateTimestamp::SCT_FROM_TLS_EXTENSION, |
| false, &scts); |
| EXPECT_EQ(CTPolicyCompliance::CT_POLICY_NOT_DIVERSE_SCTS, |
| policy_enforcer_->CheckCompliance(chain_.get(), scts, |
| NetLogWithSource())); |
| |
| // SCT from after disqualification. |
| scts.clear(); |
| FillListWithSCTsOfOrigin(SignedCertificateTimestamp::SCT_FROM_TLS_EXTENSION, |
| 1, &scts); |
| AddDisqualifiedLogSCT(SignedCertificateTimestamp::SCT_FROM_TLS_EXTENSION, |
| true, &scts); |
| EXPECT_EQ(CTPolicyCompliance::CT_POLICY_NOT_DIVERSE_SCTS, |
| policy_enforcer_->CheckCompliance(chain_.get(), scts, |
| NetLogWithSource())); |
| |
| // Embedded SCT from before disqualification. |
| scts.clear(); |
| FillListWithSCTsOfOrigin(SignedCertificateTimestamp::SCT_FROM_TLS_EXTENSION, |
| 1, &scts); |
| AddDisqualifiedLogSCT(SignedCertificateTimestamp::SCT_EMBEDDED, false, &scts); |
| EXPECT_EQ(CTPolicyCompliance::CT_POLICY_NOT_DIVERSE_SCTS, |
| policy_enforcer_->CheckCompliance(chain_.get(), scts, |
| NetLogWithSource())); |
| |
| // Embedded SCT from after disqualification. |
| scts.clear(); |
| FillListWithSCTsOfOrigin(SignedCertificateTimestamp::SCT_FROM_TLS_EXTENSION, |
| 1, &scts); |
| AddDisqualifiedLogSCT(SignedCertificateTimestamp::SCT_EMBEDDED, true, &scts); |
| EXPECT_EQ(CTPolicyCompliance::CT_POLICY_NOT_DIVERSE_SCTS, |
| policy_enforcer_->CheckCompliance(chain_.get(), scts, |
| NetLogWithSource())); |
| } |
| |
| TEST_F(ChromeCTPolicyEnforcerTest, |
| ConformsWithDisqualifiedLogBeforeDisqualificationDate) { |
| SCTList scts; |
| FillListWithSCTsOfOrigin(SignedCertificateTimestamp::SCT_EMBEDDED, 4, &scts); |
| AddDisqualifiedLogSCT(SignedCertificateTimestamp::SCT_EMBEDDED, false, &scts); |
| |
| // |chain_| is valid for 10 years - over 121 months - so requires 5 SCTs. |
| EXPECT_EQ(CTPolicyCompliance::CT_POLICY_COMPLIES_VIA_SCTS, |
| policy_enforcer_->CheckCompliance(chain_.get(), scts, |
| NetLogWithSource())); |
| } |
| |
| TEST_F(ChromeCTPolicyEnforcerTest, |
| DoesNotConformWithDisqualifiedLogAfterDisqualificationDate) { |
| SCTList scts; |
| FillListWithSCTsOfOrigin(SignedCertificateTimestamp::SCT_EMBEDDED, 4, &scts); |
| AddDisqualifiedLogSCT(SignedCertificateTimestamp::SCT_EMBEDDED, true, &scts); |
| |
| // |chain_| is valid for 10 years - over 121 months - so requires 5 SCTs. |
| EXPECT_EQ(CTPolicyCompliance::CT_POLICY_NOT_ENOUGH_SCTS, |
| policy_enforcer_->CheckCompliance(chain_.get(), scts, |
| NetLogWithSource())); |
| } |
| |
| TEST_F(ChromeCTPolicyEnforcerTest, |
| DoesNotConformWithIssuanceDateAfterDisqualificationDate) { |
| SCTList scts; |
| AddDisqualifiedLogSCT(SignedCertificateTimestamp::SCT_EMBEDDED, true, &scts); |
| FillListWithSCTsOfOrigin(SignedCertificateTimestamp::SCT_EMBEDDED, 4, &scts); |
| // Make sure all SCTs are after the disqualification date. |
| for (size_t i = 1; i < scts.size(); ++i) |
| scts[i]->timestamp = scts[0]->timestamp; |
| |
| // |chain_| is valid for 10 years - over 121 months - so requires 5 SCTs. |
| EXPECT_EQ(CTPolicyCompliance::CT_POLICY_NOT_ENOUGH_SCTS, |
| policy_enforcer_->CheckCompliance(chain_.get(), scts, |
| NetLogWithSource())); |
| } |
| |
| TEST_F(ChromeCTPolicyEnforcerTest, |
| DoesNotConformToCTPolicyNotEnoughUniqueEmbeddedLogs) { |
| SCTList scts; |
| std::vector<std::string> desired_logs; |
| |
| // One Google Log. |
| desired_logs.clear(); |
| desired_logs.push_back(google_log_id_); |
| FillListWithSCTsOfOrigin(SignedCertificateTimestamp::SCT_EMBEDDED, |
| desired_logs.size(), desired_logs, true, &scts); |
| |
| // Two distinct non-Google logs. |
| desired_logs.clear(); |
| desired_logs.push_back(std::string(crypto::kSHA256Length, 'A')); |
| desired_logs.push_back(std::string(crypto::kSHA256Length, 'B')); |
| FillListWithSCTsOfOrigin(SignedCertificateTimestamp::SCT_EMBEDDED, |
| desired_logs.size(), desired_logs, true, &scts); |
| |
| // Two unique SCTs from the same non-Google log. |
| desired_logs.clear(); |
| desired_logs.push_back(std::string(crypto::kSHA256Length, 'C')); |
| desired_logs.push_back(std::string(crypto::kSHA256Length, 'C')); |
| FillListWithSCTsOfOrigin(SignedCertificateTimestamp::SCT_EMBEDDED, |
| desired_logs.size(), desired_logs, true, &scts); |
| |
| // |chain_| is valid for 10 years - over 121 months - so requires 5 SCTs. |
| // However, there are only 4 SCTs are from distinct logs. |
| EXPECT_EQ(CTPolicyCompliance::CT_POLICY_NOT_ENOUGH_SCTS, |
| policy_enforcer_->CheckCompliance(chain_.get(), scts, |
| NetLogWithSource())); |
| } |
| |
| TEST_F(ChromeCTPolicyEnforcerTest, |
| ConformsToPolicyExactNumberOfSCTsForValidityPeriod) { |
| std::unique_ptr<crypto::RSAPrivateKey> private_key( |
| crypto::RSAPrivateKey::Create(1024)); |
| ASSERT_TRUE(private_key); |
| |
| // Test multiple validity periods |
| base::Time time_2015_3_0_25_11_25_0_0 = |
| CreateTime({2015, 3, 0, 25, 11, 25, 0, 0}); |
| |
| base::Time time_2016_6_0_6_11_25_0_0 = |
| CreateTime({2016, 6, 0, 6, 11, 25, 0, 0}); |
| |
| base::Time time_2016_6_0_25_11_25_0_0 = |
| CreateTime({2016, 6, 0, 25, 11, 25, 0, 0}); |
| |
| base::Time time_2016_6_0_27_11_25_0_0 = |
| CreateTime({2016, 6, 0, 27, 11, 25, 0, 0}); |
| |
| base::Time time_2017_6_0_25_11_25_0_0 = |
| CreateTime({2017, 6, 0, 25, 11, 25, 0, 0}); |
| |
| base::Time time_2017_6_0_28_11_25_0_0 = |
| CreateTime({2017, 6, 0, 28, 11, 25, 0, 0}); |
| |
| base::Time time_2018_6_0_25_11_25_0_0 = |
| CreateTime({2018, 6, 0, 25, 11, 25, 0, 0}); |
| |
| base::Time time_2018_6_0_27_11_25_0_0 = |
| CreateTime({2018, 6, 0, 27, 11, 25, 0, 0}); |
| |
| const struct TestData { |
| base::Time validity_start; |
| base::Time validity_end; |
| size_t scts_required; |
| } kTestData[] = {{// Cert valid for -14 months (nonsensical), needs 2 SCTs. |
| time_2016_6_0_6_11_25_0_0, time_2015_3_0_25_11_25_0_0, 2}, |
| {// Cert valid for 14 months, needs 2 SCTs. |
| time_2015_3_0_25_11_25_0_0, time_2016_6_0_6_11_25_0_0, 2}, |
| {// Cert valid for exactly 15 months, needs 3 SCTs. |
| time_2015_3_0_25_11_25_0_0, time_2016_6_0_25_11_25_0_0, 3}, |
| {// Cert valid for over 15 months, needs 3 SCTs. |
| time_2015_3_0_25_11_25_0_0, time_2016_6_0_27_11_25_0_0, 3}, |
| {// Cert valid for exactly 27 months, needs 3 SCTs. |
| time_2015_3_0_25_11_25_0_0, time_2017_6_0_25_11_25_0_0, 3}, |
| {// Cert valid for over 27 months, needs 4 SCTs. |
| time_2015_3_0_25_11_25_0_0, time_2017_6_0_28_11_25_0_0, 4}, |
| {// Cert valid for exactly 39 months, needs 4 SCTs. |
| time_2015_3_0_25_11_25_0_0, time_2018_6_0_25_11_25_0_0, 4}, |
| {// Cert valid for over 39 months, needs 5 SCTs. |
| time_2015_3_0_25_11_25_0_0, time_2018_6_0_27_11_25_0_0, 5}}; |
| |
| for (size_t i = 0; i < base::size(kTestData); ++i) { |
| SCOPED_TRACE(i); |
| const base::Time& start = kTestData[i].validity_start; |
| const base::Time& end = kTestData[i].validity_end; |
| size_t required_scts = kTestData[i].scts_required; |
| |
| // Create a self-signed certificate with exactly the validity period. |
| std::string cert_data; |
| ASSERT_TRUE(net::x509_util::CreateSelfSignedCert( |
| private_key->key(), net::x509_util::DIGEST_SHA256, "CN=test", |
| i * 10 + required_scts, start, end, {}, &cert_data)); |
| scoped_refptr<X509Certificate> cert( |
| X509Certificate::CreateFromBytes(cert_data.data(), cert_data.size())); |
| ASSERT_TRUE(cert); |
| |
| for (size_t i = 0; i < required_scts - 1; ++i) { |
| SCTList scts; |
| FillListWithSCTsOfOrigin(SignedCertificateTimestamp::SCT_EMBEDDED, i, |
| std::vector<std::string>(), false, &scts); |
| EXPECT_EQ(CTPolicyCompliance::CT_POLICY_NOT_ENOUGH_SCTS, |
| policy_enforcer_->CheckCompliance(cert.get(), scts, |
| NetLogWithSource())) |
| << " for: " << (end - start).InDays() << " and " << required_scts |
| << " scts=" << scts.size() << " i=" << i; |
| } |
| SCTList scts; |
| FillListWithSCTsOfOrigin(SignedCertificateTimestamp::SCT_EMBEDDED, |
| required_scts, std::vector<std::string>(), false, |
| &scts); |
| EXPECT_EQ( |
| CTPolicyCompliance::CT_POLICY_COMPLIES_VIA_SCTS, |
| policy_enforcer_->CheckCompliance(cert.get(), scts, NetLogWithSource())) |
| << " for: " << (end - start).InDays() << " and " << required_scts |
| << " scts=" << scts.size(); |
| } |
| } |
| |
| } // namespace |
| |
| } // namespace certificate_transparency |
