chrome/app/signature_validator_win_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 <windows.h>
   6 #include <atlstr.h>
   7 #include <wintrust.h>
   8
   9 #include "base/base_paths.h"
  10 #include "base/basictypes.h"
  11 #include "base/compiler_specific.h"
  12 #include "base/files/file_path.h"
  13 #include "base/files/file_util.h"
  14 #include "base/logging.h"
  15 #include "base/path_service.h"
  16 #include "base/strings/string_number_conversions.h"
  17 #include "base/strings/string_piece.h"
  18 #include "base/strings/string_util.h"
  19 #include "chrome/app/signature_validator_win.h"
  20 #include "crypto/sha2.h"
  21 #include "crypto/wincrypt_shim.h"
  22 #include "net/cert/test_root_certs.h"
  23 #include "testing/gtest/include/gtest/gtest.h"
  24
  25 namespace {
  26
  27 const char kGoogleCertIssuer[] = "Google Inc";
  28 const int CERT_BUFFER_SIZE = 1024;
  29
  30 const base::FilePath::CharType kCertificateRelativePath[] =
  31     FILE_PATH_LITERAL("chrome\\app\\test_data\\certificates\\");
  32 const base::FilePath::CharType kDLLRelativePath[] =
  33     FILE_PATH_LITERAL("chrome\\app\\test_data\\dlls\\");
  34
  35 class SignatureValidatorTest : public testing::Test {
  36  protected:
  37   SignatureValidatorTest() {}
  38
  39   void SetUp() override {
  40     test_roots_ = net::TestRootCerts::GetInstance();
  41     base::FilePath cert_path =
  42         GetTestCertsDirectory().Append(L"AuthorityCert.cer");
  43     base::FilePath other_cert_path =
  44         GetTestCertsDirectory().Append(L"OtherAuthorityCert.cer");
  45     test_roots_->AddFromFile(cert_path);
  46     test_roots_->AddFromFile(other_cert_path);
  47     EXPECT_FALSE(test_roots_->IsEmpty());
  48
  49     SetExpectedHash(GetTestCertsDirectory().Append(L"ValidCert.cer"));
  50   }
  51
  52   void TearDown() override {
  53     test_roots_->Clear();
  54     EXPECT_TRUE(test_roots_->IsEmpty());
  55   }
  56
  57   base::FilePath GetTestCertsDirectory() {
  58     base::FilePath src_root;
  59     PathService::Get(base::DIR_SOURCE_ROOT, &src_root);
  60     return src_root.Append(kCertificateRelativePath);
  61   }
  62
  63   base::FilePath GetTestDLLsDirectory() {
  64     base::FilePath src_root;
  65     PathService::Get(base::DIR_SOURCE_ROOT, &src_root);
  66     return src_root.Append(kDLLRelativePath);
  67   }
  68
  69   void SetExpectedHash(const base::FilePath& cert_path) {
  70     char cert_buffer[CERT_BUFFER_SIZE];
  71     base::ReadFile(cert_path, cert_buffer, CERT_BUFFER_SIZE);
  72
  73     PCCERT_CONTEXT cert = CertCreateCertificateContext(X509_ASN_ENCODING,
  74         reinterpret_cast<byte*>(&cert_buffer),
  75         CERT_BUFFER_SIZE);
  76
  77     CRYPT_BIT_BLOB blob = cert->pCertInfo->SubjectPublicKeyInfo.PublicKey;
  78     size_t public_key_length = blob.cbData;
  79     uint8* public_key = blob.pbData;
  80
  81     uint8 hash[crypto::kSHA256Length] = {0};
  82
  83     base::StringPiece key_bytes(reinterpret_cast<char*>(public_key),
  84                                 public_key_length);
  85     crypto::SHA256HashString(key_bytes, hash, crypto::kSHA256Length);
  86
  87     std::string public_key_hash =
  88         base::StringToLowerASCII(base::HexEncode(hash, arraysize(hash)));
  89     expected_hashes_.push_back(public_key_hash);
  90   }
  91
  92   void RunTest(const wchar_t* dll_filename, bool isValid, bool isGoogle) {
  93     base::FilePath full_dll_path = GetTestDLLsDirectory().Append(dll_filename);
  94     ASSERT_EQ(isValid, VerifyAuthenticodeSignature(full_dll_path));
  95     ASSERT_EQ(isGoogle, VerifySignerIsGoogle(full_dll_path, kGoogleCertIssuer,
  96                                              expected_hashes_));
  97   }
  98
  99  private:
 100   net::TestRootCerts* test_roots_;
 101   std::vector<std::string> expected_hashes_;
 102 };
 103
 104 }  // namespace
 105
 106 TEST_F(SignatureValidatorTest, ValidSigTest) {
 107   RunTest(L"valid_sig.dll", true, true);
 108 }
 109
 110 TEST_F(SignatureValidatorTest, SelfSignedTest) {
 111   RunTest(L"self_signed.dll", false, false);
 112 }
 113
 114 TEST_F(SignatureValidatorTest, NotSignedTest) {
 115   RunTest(L"not_signed.dll", false, false);
 116 }
 117
 118 TEST_F(SignatureValidatorTest, NotGoogleTest) {
 119   RunTest(L"not_google.dll", true, false);
 120 }
 121
 122 TEST_F(SignatureValidatorTest, CertPinningTest) {
 123   RunTest(L"different_hash.dll", true, false);
 124 }
 125
 126 TEST_F(SignatureValidatorTest, ExpiredCertTest) {
 127   //TODO(caitkp): Figure out how to sign a dll with an expired cert.
 128   RunTest(L"expired.dll", false, false);
 129 }
 130
 131