Add initial code for verifying a certificate chain.

net/cert/internal/verify_certificate_chain_unittest.cc

+// Copyright 2015 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/internal/verify_certificate_chain.h"
+
+#include "base/base_paths.h"
+#include "base/files/file_util.h"
+#include "base/path_service.h"
+#include "base/strings/string_split.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
+#include "net/cert/internal/parse_certificate.h"
+#include "net/cert/internal/signature_policy.h"
+#include "net/cert/internal/test_helpers.h"
+#include "net/cert/pem_tokenizer.h"
+#include "net/der/input.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace net {
+
+namespace {
+
+// Reads a data file from the unit-test data.
+std::string ReadTestFileToString(const std::string& file_name) {
+  // Compute the full path, relative to the src/ directory.
+  base::FilePath src_root;
+  PathService::Get(base::DIR_SOURCE_ROOT, &src_root);
+  base::FilePath filepath = src_root.AppendASCII(
+      std::string("net/data/verify_certificate_chain_unittest/") + file_name);
+
+  // Read the full contents of the file.
+  std::string file_data;
+  if (!base::ReadFileToString(filepath, &file_data)) {
+    ADD_FAILURE() << "Couldn't read file: " << filepath.value();
+    return std::string();
+  }
+
+  return file_data;
+}
+
+// Adds the certificate |cert_der| as a trust anchor to |trust_store|.
+void AddCertificateToTrustStore(const std::string& cert_der,
+                                TrustStore* trust_store) {
+  ParsedCertificate cert;
+  ASSERT_TRUE(ParseCertificate(InputFromString(&cert_der), &cert));
+
+  ParsedTbsCertificate tbs;
+  ASSERT_TRUE(ParseTbsCertificate(cert.tbs_certificate_tlv, &tbs));
+  TrustAnchor anchor = {tbs.spki_tlv.AsString(), tbs.subject_tlv.AsString()};
+  trust_store->anchors.push_back(anchor);
+}
+
+// Reads a test case from |file_name|. Test cases are comprised of a
+// certificate chain, trust store, a timestamp to validate at, and the
+// expected result of verification.
+void ReadTestFromFile(const std::string& file_name,
+                      std::vector<std::string>* chain,
+                      TrustStore* trust_store,
+                      der::GeneralizedTime* time,
+                      bool* verify_result) {
+  chain->clear();
+  *trust_store = TrustStore();
+
+  std::string file_data = ReadTestFileToString(file_name);
+
+  std::vector<std::string> pem_headers;
+
+  const char kCertificateHeader[] = "CERTIFICATE";
+  const char kTrustedCertificateHeader[] = "TRUSTED_CERTIFICATE";
+  const char kTimeHeader[] = "TIME";
+  const char kResultHeader[] = "VERIFY_RESULT";
+
+  pem_headers.push_back(kCertificateHeader);
+  pem_headers.push_back(kTrustedCertificateHeader);
+  pem_headers.push_back(kTimeHeader);
+  pem_headers.push_back(kResultHeader);
+
+  bool has_time = false;
+  bool has_result = false;
+
+  PEMTokenizer pem_tokenizer(file_data, pem_headers);
+  while (pem_tokenizer.GetNext()) {
+    const std::string& block_type = pem_tokenizer.block_type();
+    const std::string& block_data = pem_tokenizer.data();
+
+    if (block_type == kCertificateHeader) {
+      chain->push_back(block_data);
+    } else if (block_type == kTrustedCertificateHeader) {
+      AddCertificateToTrustStore(block_data, trust_store);
+    } else if (block_type == kTimeHeader) {
+      ASSERT_FALSE(has_time) << "Duplicate " << kTimeHeader;
+      has_time = true;
+      ASSERT_TRUE(der::ParseUTCTime(InputFromString(&block_data), time));
+    } else if (block_type == kResultHeader) {
+      ASSERT_FALSE(has_result) << "Duplicate " << kResultHeader;
+      ASSERT_TRUE(block_data == "SUCCESS" || block_data == "FAIL")
+          << "Unrecognized result: " << block_data;
+      has_result = true;
+      *verify_result = block_data == "SUCCESS";
+    }
+  }
+
+  ASSERT_TRUE(has_time);
+  ASSERT_TRUE(has_result);
+}
+
+void RunTest(const char* file_name) {
+  std::vector<std::string> chain;
+  TrustStore trust_store;
+  der::GeneralizedTime time;
+  bool expected_result;
+
+  ReadTestFromFile(file_name, &chain, &trust_store, &time, &expected_result);
+
+  std::vector<der::Input> input_chain;
+  for (const auto& cert_str : chain)
+    input_chain.push_back(InputFromString(&cert_str));
+
+  SimpleSignaturePolicy signature_policy(2048);
+
+  bool result =
+      VerifyCertificateChain(input_chain, trust_store, &signature_policy, time);
+
+  ASSERT_EQ(expected_result, result);
+}
+
+TEST(VerifyCertificateChainTest, TargetAndIntermediary) {
+  RunTest("target-and-intermediary.pem");
+}
+
+TEST(VerifyCertificateChainTest, UnknownRoot) {
+  RunTest("unknown-root.pem");
+}
+
+TEST(VerifyCertificateChainTest, IntermediaryLacksBasicConstraints) {
+  RunTest("intermediary-lacks-basic-constraints.pem");
+}
+
+TEST(VerifyCertificateChainTest, IntermediaryBasicConstraintsCaFalse) {
+  RunTest("intermediary-basic-constraints-ca-false.pem");
+}
+
+TEST(VerifyCertificateChainTest, IntermediaryBasicConstraintsNotCritical) {
+  RunTest("intermediary-basic-constraints-not-critical.pem");
+}
+
+TEST(VerifyCertificateChainTest, IntermediaryLacksSigningKeyUsage) {
+  RunTest("intermediary-lacks-signing-key-usage.pem");
+}
+
+TEST(VerifyCertificateChainTest, IntermediaryUnknownCriticalExtension) {
+  RunTest("intermediary-unknown-critical-extension.pem");
+}
+
+TEST(VerifyCertificateChainTest, IntermediaryUnknownNonCriticalExtension) {
+  RunTest("intermediary-unknown-non-critical-extension.pem");
+}
+
+TEST(VerifyCertificateChainTest, ViolatesBasicConstraintsPathlen0) {
+  RunTest("violates-basic-constraints-pathlen-0.pem");
+}
+
+TEST(VerifyCertificateChainTest, BasicConstraintsPathlen0SelfIssued) {
+  RunTest("basic-constraints-pathlen-0-self-issued.pem");
+}
+
+TEST(VerifyCertificateChainTest, TargetSignedWithMd5) {
+  RunTest("target-signed-with-md5.pem");
+}
+
+TEST(VerifyCertificateChainTest, IntermediarySignedWithMd5) {
+  RunTest("intermediary-signed-with-md5.pem");
+}
+
+TEST(VerifyCertificateChainTest, TargetWrongSignature) {
+  RunTest("target-wrong-signature.pem");
+}
+
+TEST(VerifyCertificateChainTest, TargetSignedBy512bitRsa) {
+  RunTest("target-signed-by-512bit-rsa.pem");
+}
+
+TEST(VerifyCertificateChainTest, TargetSignedUsingEcdsa) {
+  RunTest("target-signed-using-ecdsa.pem");
+}
+
+TEST(VerifyCertificateChainTest, ExpiredIntermediary) {
+  RunTest("expired-intermediary.pem");
+}
+
+TEST(VerifyCertificateChainTest, ExpiredTarget) {
+  RunTest("expired-target.pem");
+}
+
+TEST(VerifyCertificateChainTest, ExpiredTargetNotBefore) {
+  RunTest("expired-target-notBefore.pem");
+}
+
+TEST(VerifyCertificateChainTest, TargetNotEndEntity) {
+  RunTest("target-not-end-entity.pem");
+}
+
+TEST(VerifyCertificateChainTest, TargetHasKeyCertSignButNotCa) {
+  RunTest("target-has-keycertsign-but-not-ca.pem");
+}
+
+TEST(VerifyCertificateChainTest, TargetHasPathlenButNotCa) {
+  RunTest("target-has-pathlen-but-not-ca.pem");
+}
+
+TEST(VerifyCertificateChainTest, TargetUnknownCriticalExtension) {
+  RunTest("target-unknown-critical-extension.pem");
+}
+
+// Tests that verifying a chain with no certificates fails.
+TEST(VerifyCertificateChainTest, EmptyChainIsInvalid) {
+  TrustStore trust_store;
+  der::GeneralizedTime time;
+  std::vector<der::Input> chain;
+  SimpleSignaturePolicy signature_policy(2048);
+
+  ASSERT_FALSE(
+      VerifyCertificateChain(chain, trust_store, &signature_policy, time));
+}
+
+// TODO(eroman): Add test that invalidate validity dates where the day or month
+// ordinal not in range, like "March 39, 2016" are rejected.
+
+}  // namespace
+
+}  // namespace net