net/cert/multi_log_ct_verifier_unittest.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "net/cert/multi_log_ct_verifier.h"
   6
   7 #include <string>
   8
   9 #include "base/files/file_path.h"
  10 #include "base/files/file_util.h"
  11 #include "base/metrics/histogram.h"
  12 #include "base/metrics/histogram_samples.h"
  13 #include "base/metrics/statistics_recorder.h"
  14 #include "base/values.h"
  15 #include "net/base/capturing_net_log.h"
  16 #include "net/base/net_errors.h"
  17 #include "net/base/net_log.h"
  18 #include "net/base/test_data_directory.h"
  19 #include "net/cert/ct_log_verifier.h"
  20 #include "net/cert/ct_serialization.h"
  21 #include "net/cert/ct_verify_result.h"
  22 #include "net/cert/pem_tokenizer.h"
  23 #include "net/cert/sct_status_flags.h"
  24 #include "net/cert/signed_certificate_timestamp.h"
  25 #include "net/cert/x509_certificate.h"
  26 #include "net/test/cert_test_util.h"
  27 #include "net/test/ct_test_util.h"
  28 #include "testing/gtest/include/gtest/gtest.h"
  29
  30 namespace net {
  31
  32 namespace {
  33
  34 const char kLogDescription[] = "somelog";
  35 const char kSCTCountHistogram[] =
  36     "Net.CertificateTransparency.SCTsPerConnection";
  37
  38 class MultiLogCTVerifierTest : public ::testing::Test {
  39  public:
  40   virtual void SetUp() OVERRIDE {
  41     scoped_ptr<CTLogVerifier> log(
  42         CTLogVerifier::Create(ct::GetTestPublicKey(), kLogDescription));
  43     ASSERT_TRUE(log);
  44
  45     verifier_.reset(new MultiLogCTVerifier());
  46     verifier_->AddLog(log.Pass());
  47     std::string der_test_cert(ct::GetDerEncodedX509Cert());
  48     chain_ = X509Certificate::CreateFromBytes(
  49         der_test_cert.data(),
  50         der_test_cert.length());
  51     ASSERT_TRUE(chain_.get());
  52
  53     embedded_sct_chain_ =
  54         CreateCertificateChainFromFile(GetTestCertsDirectory(),
  55                                        "ct-test-embedded-cert.pem",
  56                                        X509Certificate::FORMAT_AUTO);
  57     ASSERT_TRUE(embedded_sct_chain_.get());
  58   }
  59
  60   bool CheckForSingleVerifiedSCTInResult(const ct::CTVerifyResult& result) {
  61     return (result.verified_scts.size() == 1U) &&
  62         result.invalid_scts.empty() &&
  63         result.unknown_logs_scts.empty() &&
  64         result.verified_scts[0]->log_description == kLogDescription;
  65   }
  66
  67   bool CheckForSCTOrigin(
  68       const ct::CTVerifyResult& result,
  69       ct::SignedCertificateTimestamp::Origin origin) {
  70     return (result.verified_scts.size() > 0) &&
  71         (result.verified_scts[0]->origin == origin);
  72   }
  73
  74   bool CheckForEmbeddedSCTInNetLog(CapturingNetLog& net_log) {
  75     CapturingNetLog::CapturedEntryList entries;
  76     net_log.GetEntries(&entries);
  77     if (entries.size() != 2)
  78       return false;
  79
  80     const CapturingNetLog::CapturedEntry& received = entries[0];
  81     std::string embedded_scts;
  82     if (!received.GetStringValue("embedded_scts", &embedded_scts))
  83       return false;
  84     if (embedded_scts.empty())
  85       return false;
  86
  87     const CapturingNetLog::CapturedEntry& parsed = entries[1];
  88     base::ListValue* verified_scts;
  89     if (!parsed.GetListValue("verified_scts", &verified_scts) ||
  90         verified_scts->GetSize() != 1) {
  91       return false;
  92     }
  93
  94     base::DictionaryValue* the_sct;
  95     if (!verified_scts->GetDictionary(0, &the_sct))
  96       return false;
  97
  98     std::string origin;
  99     if (!the_sct->GetString("origin", &origin))
 100       return false;
 101     if (origin != "embedded_in_certificate")
 102       return false;
 103
 104     base::ListValue* other_scts;
 105     if (!parsed.GetListValue("invalid_scts", &other_scts) ||
 106         !other_scts->empty()) {
 107       return false;
 108     }
 109
 110     if (!parsed.GetListValue("unknown_logs_scts", &other_scts) ||
 111         !other_scts->empty()) {
 112       return false;
 113     }
 114
 115     return true;
 116   }
 117
 118   std::string GetSCTListWithInvalidSCT() {
 119     std::string sct(ct::GetTestSignedCertificateTimestamp());
 120
 121     // Change a byte inside the Log ID part of the SCT so it does
 122     // not match the log used in the tests
 123     sct[15] = 't';
 124
 125     std::string sct_list;
 126     ct::EncodeSCTListForTesting(sct, &sct_list);
 127     return sct_list;
 128   }
 129
 130   bool VerifySinglePrecertificateChain(scoped_refptr<X509Certificate> chain,
 131                                        const BoundNetLog& bound_net_log,
 132                                        ct::CTVerifyResult* result) {
 133     return verifier_->Verify(chain.get(),
 134                              std::string(),
 135                              std::string(),
 136                              result,
 137                              bound_net_log) == OK;
 138   }
 139
 140   bool VerifySinglePrecertificateChain(scoped_refptr<X509Certificate> chain) {
 141     ct::CTVerifyResult result;
 142     CapturingNetLog net_log;
 143     BoundNetLog bound_net_log =
 144         BoundNetLog::Make(&net_log, NetLog::SOURCE_CONNECT_JOB);
 145
 146     return verifier_->Verify(chain.get(),
 147                              std::string(),
 148                              std::string(),
 149                              &result,
 150                              bound_net_log) == OK;
 151   }
 152
 153   bool CheckPrecertificateVerification(scoped_refptr<X509Certificate> chain) {
 154     ct::CTVerifyResult result;
 155     CapturingNetLog net_log;
 156     BoundNetLog bound_net_log =
 157       BoundNetLog::Make(&net_log, NetLog::SOURCE_CONNECT_JOB);
 158     return (VerifySinglePrecertificateChain(chain, bound_net_log, &result) &&
 159             CheckForSingleVerifiedSCTInResult(result) &&
 160             CheckForSCTOrigin(result,
 161                               ct::SignedCertificateTimestamp::SCT_EMBEDDED) &&
 162             CheckForEmbeddedSCTInNetLog(net_log));
 163   }
 164
 165   // Histogram-related helper methods
 166   int GetValueFromHistogram(std::string histogram_name, int sample_index) {
 167     base::Histogram* histogram = static_cast<base::Histogram*>(
 168         base::StatisticsRecorder::FindHistogram(histogram_name));
 169
 170     if (histogram == NULL)
 171       return 0;
 172
 173     scoped_ptr<base::HistogramSamples> samples = histogram->SnapshotSamples();
 174     return samples->GetCount(sample_index);
 175   }
 176
 177   int NumConnectionsWithSingleSCT() {
 178     return GetValueFromHistogram(kSCTCountHistogram, 1);
 179   }
 180
 181   int NumEmbeddedSCTsInHistogram() {
 182     return GetValueFromHistogram("Net.CertificateTransparency.SCTOrigin",
 183                                  ct::SignedCertificateTimestamp::SCT_EMBEDDED);
 184   }
 185
 186   int NumValidSCTsInStatusHistogram() {
 187     return GetValueFromHistogram("Net.CertificateTransparency.SCTStatus",
 188                                  ct::SCT_STATUS_OK);
 189   }
 190
 191  protected:
 192   scoped_ptr<MultiLogCTVerifier> verifier_;
 193   scoped_refptr<X509Certificate> chain_;
 194   scoped_refptr<X509Certificate> embedded_sct_chain_;
 195 };
 196
 197 TEST_F(MultiLogCTVerifierTest, VerifiesEmbeddedSCT) {
 198   ASSERT_TRUE(CheckPrecertificateVerification(embedded_sct_chain_));
 199 }
 200
 201 TEST_F(MultiLogCTVerifierTest, VerifiesEmbeddedSCTWithPreCA) {
 202   scoped_refptr<X509Certificate> chain(
 203       CreateCertificateChainFromFile(GetTestCertsDirectory(),
 204                                      "ct-test-embedded-with-preca-chain.pem",
 205                                      X509Certificate::FORMAT_AUTO));
 206   ASSERT_TRUE(chain.get());
 207   ASSERT_TRUE(CheckPrecertificateVerification(chain));
 208 }
 209
 210 TEST_F(MultiLogCTVerifierTest, VerifiesEmbeddedSCTWithIntermediate) {
 211   scoped_refptr<X509Certificate> chain(CreateCertificateChainFromFile(
 212       GetTestCertsDirectory(),
 213       "ct-test-embedded-with-intermediate-chain.pem",
 214       X509Certificate::FORMAT_AUTO));
 215   ASSERT_TRUE(chain.get());
 216   ASSERT_TRUE(CheckPrecertificateVerification(chain));
 217 }
 218
 219 TEST_F(MultiLogCTVerifierTest,
 220        VerifiesEmbeddedSCTWithIntermediateAndPreCA) {
 221   scoped_refptr<X509Certificate> chain(CreateCertificateChainFromFile(
 222       GetTestCertsDirectory(),
 223       "ct-test-embedded-with-intermediate-preca-chain.pem",
 224       X509Certificate::FORMAT_AUTO));
 225   ASSERT_TRUE(chain.get());
 226   ASSERT_TRUE(CheckPrecertificateVerification(chain));
 227 }
 228
 229 TEST_F(MultiLogCTVerifierTest,
 230        VerifiesSCTOverX509Cert) {
 231   std::string sct(ct::GetTestSignedCertificateTimestamp());
 232
 233   std::string sct_list;
 234   ASSERT_TRUE(ct::EncodeSCTListForTesting(sct, &sct_list));
 235
 236   ct::CTVerifyResult result;
 237   EXPECT_EQ(OK,
 238             verifier_->Verify(
 239                 chain_.get(), std::string(), sct_list, &result, BoundNetLog()));
 240   ASSERT_TRUE(CheckForSingleVerifiedSCTInResult(result));
 241   ASSERT_TRUE(CheckForSCTOrigin(
 242       result, ct::SignedCertificateTimestamp::SCT_FROM_TLS_EXTENSION));
 243 }
 244
 245 TEST_F(MultiLogCTVerifierTest,
 246        IdentifiesSCTFromUnknownLog) {
 247   std::string sct_list = GetSCTListWithInvalidSCT();
 248   ct::CTVerifyResult result;
 249
 250   EXPECT_NE(OK,
 251             verifier_->Verify(
 252                 chain_.get(), std::string(), sct_list, &result, BoundNetLog()));
 253   EXPECT_EQ(1U, result.unknown_logs_scts.size());
 254   EXPECT_EQ("", result.unknown_logs_scts[0]->log_description);
 255 }
 256
 257 TEST_F(MultiLogCTVerifierTest, CountsValidSCTsInStatusHistogram) {
 258   int num_valid_scts = NumValidSCTsInStatusHistogram();
 259
 260   ASSERT_TRUE(VerifySinglePrecertificateChain(embedded_sct_chain_));
 261
 262   EXPECT_EQ(num_valid_scts + 1, NumValidSCTsInStatusHistogram());
 263 }
 264
 265 TEST_F(MultiLogCTVerifierTest, CountsInvalidSCTsInStatusHistogram) {
 266   std::string sct_list = GetSCTListWithInvalidSCT();
 267   ct::CTVerifyResult result;
 268   int num_valid_scts = NumValidSCTsInStatusHistogram();
 269   int num_invalid_scts = GetValueFromHistogram(
 270       "Net.CertificateTransparency.SCTStatus", ct::SCT_STATUS_LOG_UNKNOWN);
 271
 272   EXPECT_NE(OK,
 273             verifier_->Verify(
 274                 chain_.get(), std::string(), sct_list, &result, BoundNetLog()));
 275
 276   ASSERT_EQ(num_valid_scts, NumValidSCTsInStatusHistogram());
 277   ASSERT_EQ(num_invalid_scts + 1,
 278             GetValueFromHistogram("Net.CertificateTransparency.SCTStatus",
 279                                   ct::SCT_STATUS_LOG_UNKNOWN));
 280 }
 281
 282 TEST_F(MultiLogCTVerifierTest, CountsSingleEmbeddedSCTInConnectionsHistogram) {
 283   int old_sct_count = NumConnectionsWithSingleSCT();
 284   ASSERT_TRUE(CheckPrecertificateVerification(embedded_sct_chain_));
 285   EXPECT_EQ(old_sct_count + 1, NumConnectionsWithSingleSCT());
 286 }
 287
 288 TEST_F(MultiLogCTVerifierTest, CountsSingleEmbeddedSCTInOriginsHistogram) {
 289   int old_embedded_count = NumEmbeddedSCTsInHistogram();
 290   ASSERT_TRUE(CheckPrecertificateVerification(embedded_sct_chain_));
 291   EXPECT_EQ(old_embedded_count + 1, NumEmbeddedSCTsInHistogram());
 292 }
 293
 294 TEST_F(MultiLogCTVerifierTest, CountsZeroSCTsCorrectly) {
 295   int connections_without_scts = GetValueFromHistogram(kSCTCountHistogram, 0);
 296   EXPECT_FALSE(VerifySinglePrecertificateChain(chain_));
 297   ASSERT_EQ(connections_without_scts + 1,
 298             GetValueFromHistogram(kSCTCountHistogram, 0));
 299 }
 300
 301 }  // namespace
 302
 303 }  // namespace net