Class for parsing and evaluating RFC 5280 NameConstraints.

net/cert/internal/name_constraints_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/name_constraints.h"
+
+#include "base/base_paths.h"
+#include "base/files/file_path.h"
+#include "base/files/file_util.h"
+#include "base/path_service.h"
+#include "net/cert/pem_tokenizer.h"
+#include "net/der/parser.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace net {
+namespace {
+
+der::Input InputFromString(const std::string& s) {
+  return der::Input(reinterpret_cast<const uint8_t*>(s.data()), s.size());
+}
+
+der::Input SequenceValueFromString(const std::string& s) {
+  der::Parser parser(
+      der::Input(reinterpret_cast<const uint8_t*>(s.data()), s.size()));
+  der::Input data;
+  if (!parser.ReadTag(der::kSequence, &data)) {
+    EXPECT_TRUE(false);
+    return der::Input();
+  }
+  if (parser.HasMore()) {
+    EXPECT_TRUE(false);
+    return der::Input();
+  }
+  return data;
+}
+
+::testing::AssertionResult LoadTestData(const std::string& token,
+                                        const std::string& basename,
+                                        std::string* result) {
+  base::FilePath src_root;
+  PathService::Get(base::DIR_SOURCE_ROOT, &src_root);
+  std::string filename = basename + ".pem";
+  base::FilePath filepath =
+      src_root.Append(
+                  FILE_PATH_LITERAL(
+                      "net/data/name_constraints_unittest/name_constraints/"))
+          .AppendASCII(filename);
+
+  std::string file_data;
+  if (!base::ReadFileToString(filepath, &file_data)) {
+    return ::testing::AssertionFailure()
+           << "ReadFileToString returned false on " << filename;
+  }
+
+  std::vector<std::string> pem_headers;
+  pem_headers.push_back(token);
+  PEMTokenizer pem_tokenizer(file_data, pem_headers);
+  if (!pem_tokenizer.GetNext()) {
+    return ::testing::AssertionFailure() << "PEM.GetNext returned false on "
+                                         << filename << " with header "
+                                         << token;
+  }
+
+  result->assign(pem_tokenizer.data());
+  return ::testing::AssertionSuccess();
+}
+
+::testing::AssertionResult LoadTestName(const std::string& basename,
+                                        std::string* result) {
+  return LoadTestData("NAME", basename, result);
+}
+
+::testing::AssertionResult LoadTestNameConstraint(const std::string& basename,
+                                                  std::string* result) {
+  return LoadTestData("NAME CONSTRAINTS", basename, result);
+}
+
+::testing::AssertionResult LoadTestSubjectAltName(const std::string& basename,
+                                                  std::string* result) {
+  return LoadTestData("SUBJECT ALTERNATIVE NAME", basename, result);
+}
+
+const int kOtherNameFlag = 1 << 0;
+const int kRfc822NameFlag = 1 << 1;
+const int kDnsNameFlag = 1 << 2;
+const int kX400AddressFlag = 1 << 3;
+const int kDirectoryNameFlag = 1 << 4;
+const int kEdiPartyNameFlag = 1 << 5;
+const int kUniformResourceIdentifierFlag = 1 << 6;
+const int kIpAddressFlag = 1 << 7;
+const int kRegisteredIdFlag = 1 << 8;
+const int kAllFlags = (1 << 9) - 1;
+::testing::AssertionResult CheckNotPresent(
+    const NameConstraints& name_constraints,
+    int flag) {
+  if (flag & kOtherNameFlag && !name_constraints.IsPermittedOtherName())
+    return ::testing::AssertionFailure() << "contained otherNames";
+  if (flag & kRfc822NameFlag && !name_constraints.IsPermittedRFC822Name())
+    return ::testing::AssertionFailure() << "contained rfc822Names";
+  if (flag & kDnsNameFlag) {
+    if (!name_constraints.IsPermittedDNSName("a") ||
+        !name_constraints.IsPermittedDNSName("b"))
+      return ::testing::AssertionFailure() << "contained dNSNames";
+  }
+  if (flag & kX400AddressFlag && !name_constraints.IsPermittedX400Address())
+    return ::testing::AssertionFailure() << "contained x400Addresses";
+  if (flag & kDirectoryNameFlag) {
+    std::string name_us;
+    ::testing::AssertionResult r(::testing::AssertionFailure());
+    if (!(r = LoadTestName("name-us", &name_us)))
+      return r;
+    std::string name_jp;
+    if (!(r = LoadTestName("name-jp", &name_jp)))
+      return r;
+    std::string name_de;
+    if (!(r = LoadTestName("name-de", &name_de)))
+      return r;
+    std::string name_ca;
+    if (!(r = LoadTestName("name-ca", &name_ca)))
+      return r;
+    if (!name_constraints.IsPermittedDirectoryName(
+            SequenceValueFromString(name_us)) ||
+        !name_constraints.IsPermittedDirectoryName(
+            SequenceValueFromString(name_jp)) ||
+        !name_constraints.IsPermittedDirectoryName(
+            SequenceValueFromString(name_de)) ||
+        !name_constraints.IsPermittedDirectoryName(
+            SequenceValueFromString(name_ca))) {
+      return ::testing::AssertionFailure() << "contained directoryNames";
+    }
+  }
+  if (flag & kEdiPartyNameFlag && !name_constraints.IsPermittedEdiPartyName())
+    return ::testing::AssertionFailure() << "contained ediPartyNames";
+  if (flag & kUniformResourceIdentifierFlag &&
+      !name_constraints.IsPermittedURI()) {
+    return ::testing::AssertionFailure()
+           << "contained uniformResourceIdentifiers";
+  }
+  if (flag & kIpAddressFlag) {
+    const uint8_t ip4a[] = {192, 168, 0, 1};
+    const uint8_t ip4b[] = {255, 255, 255, 255};
+    // clang-format off
+    const uint8_t ip6a[] = {1, 2,  3,  4,  5,  6,  7,  8,
+                            9, 10, 11, 12, 13, 14, 15, 16};
+    const uint8_t ip6b[] = {255, 255, 255, 255, 255, 255, 255, 255,
+                            255, 255, 255, 255, 255, 255, 255, 255};
+    // clang-format on
+    if (!name_constraints.IsPermittedIP(
+            IPAddressNumber(ip4a, ip4a + arraysize(ip4a))) ||
+        !name_constraints.IsPermittedIP(
+            IPAddressNumber(ip4b, ip4b + arraysize(ip4b))) ||
+        !name_constraints.IsPermittedIP(
+            IPAddressNumber(ip6a, ip6a + arraysize(ip6a))) ||
+        !name_constraints.IsPermittedIP(
+            IPAddressNumber(ip6b, ip6b + arraysize(ip6b)))) {
+      return ::testing::AssertionFailure() << "contained iPAddresses";
+    }
+  }
+  if (flag & kRegisteredIdFlag && !name_constraints.IsPermittedRegisteredId())
+    return ::testing::AssertionFailure() << "contained registeredIDs";
+
+  return ::testing::AssertionSuccess();
+}
+
+}  // namespace
+
+class ParseNameConstraints
+    : public ::testing::TestWithParam<::testing::tuple<bool>> {
+ public:
+  bool is_critical() const { return ::testing::get<0>(GetParam()); }
+};
+
+// Run the tests with the name constraints marked critical and non-critical. For
+// supported name types, the results should be the same for both.
+INSTANTIATE_TEST_CASE_P(InstantiationName,
+                        ParseNameConstraints,
+                        ::testing::Values(true, false));
+
+TEST_P(ParseNameConstraints, DNSNames) {
+  std::string a;
+  ASSERT_TRUE(LoadTestNameConstraint("dnsname", &a));
+
+  NameConstraints name_constraints;
+  EXPECT_TRUE(name_constraints.Parse(InputFromString(a), is_critical()));
+
+  EXPECT_TRUE(name_constraints.IsPermittedDNSName("permitted.example.com"));
+  EXPECT_TRUE(name_constraints.IsPermittedDNSName("permitted.example.com."));
+  EXPECT_TRUE(name_constraints.IsPermittedDNSName("a.permitted.example.com"));
+  EXPECT_FALSE(name_constraints.IsPermittedDNSName("apermitted.example.com"));
+  EXPECT_FALSE(name_constraints.IsPermittedDNSName("apermitted.example.com."));
+  EXPECT_TRUE(name_constraints.IsPermittedDNSName("alsopermitted.example.com"));
+  EXPECT_FALSE(
+      name_constraints.IsPermittedDNSName("excluded.permitted.example.com"));
+  EXPECT_FALSE(
+      name_constraints.IsPermittedDNSName("a.excluded.permitted.example.com"));
+  EXPECT_FALSE(name_constraints.IsPermittedDNSName(
+      "stillnotpermitted.excluded.permitted.example.com"));
+  EXPECT_FALSE(name_constraints.IsPermittedDNSName(
+      "a.stillnotpermitted.excluded.permitted.example.com"));
+  EXPECT_FALSE(
+      name_constraints.IsPermittedDNSName("extraneousexclusion.example.com"));
+  EXPECT_FALSE(
+      name_constraints.IsPermittedDNSName("a.extraneousexclusion.example.com"));
+  EXPECT_FALSE(name_constraints.IsPermittedDNSName("other.example.com"));
+  EXPECT_FALSE(name_constraints.IsPermittedDNSName("other.com"));
+
+  // Wildcard names:
+  // Pattern could match excluded.permitted.example.com, thus should not be
+  // allowed.
+  EXPECT_FALSE(name_constraints.IsPermittedDNSName("*.permitted.example.com"));
+  // Entirely within excluded name, obviously not allowed.
+  EXPECT_FALSE(
+      name_constraints.IsPermittedDNSName("*.excluded.permitted.example.com"));
+  // Within permitted.example.com and cannot match any exclusion, thus these are
+  // allowed.
+  EXPECT_TRUE(
+      name_constraints.IsPermittedDNSName("*.foo.permitted.example.com"));
+  EXPECT_TRUE(
+      name_constraints.IsPermittedDNSName("*.alsopermitted.example.com"));
+  // Matches permitted.example2.com, but also matches other .example2.com names
+  // which are not in either permitted or excluded, so not allowed.
+  EXPECT_FALSE(name_constraints.IsPermittedDNSName("*.example2.com"));
+  // Partial wildcards are not supported, so these name are permitted even if
+  // it seems like they shouldn't be. It's fine, since certificate verification
+  // won't treat them as wildcard names either.
+  EXPECT_TRUE(
+      name_constraints.IsPermittedDNSName("*xcluded.permitted.example.com"));
+  EXPECT_TRUE(
+      name_constraints.IsPermittedDNSName("exclude*.permitted.example.com"));
+  EXPECT_TRUE(
+      name_constraints.IsPermittedDNSName("excl*ded.permitted.example.com"));
+  // Garbage wildcard data.
+  EXPECT_FALSE(name_constraints.IsPermittedDNSName("*."));
+  EXPECT_FALSE(name_constraints.IsPermittedDNSName("*.*"));
+  EXPECT_FALSE(name_constraints.IsPermittedDNSName(".*"));
+  EXPECT_FALSE(name_constraints.IsPermittedDNSName("*"));
+  // Matches SAN with trailing dot.
+  EXPECT_TRUE(name_constraints.IsPermittedDNSName("permitted.example3.com"));
+  EXPECT_TRUE(name_constraints.IsPermittedDNSName("permitted.example3.com."));
+  EXPECT_TRUE(name_constraints.IsPermittedDNSName("a.permitted.example3.com"));
+  EXPECT_TRUE(name_constraints.IsPermittedDNSName("a.permitted.example3.com."));
+
+  EXPECT_TRUE(CheckNotPresent(name_constraints, kAllFlags & ~kDnsNameFlag));
+
+  std::string san;
+  ASSERT_TRUE(LoadTestSubjectAltName("san-permitted", &san));
+  EXPECT_TRUE(name_constraints.IsPermittedCert(der::Input(),
+                                               InputFromString(san), true));
+
+  ASSERT_TRUE(LoadTestSubjectAltName("san-excluded-dnsname", &san));
+  EXPECT_FALSE(name_constraints.IsPermittedCert(der::Input(),
+                                                InputFromString(san), true));
+
+  ASSERT_TRUE(LoadTestSubjectAltName("san-excluded-directoryname", &san));
+  EXPECT_TRUE(name_constraints.IsPermittedCert(der::Input(),
+                                               InputFromString(san), true));
+
+  ASSERT_TRUE(LoadTestSubjectAltName("san-excluded-ipaddress", &san));
+  EXPECT_TRUE(name_constraints.IsPermittedCert(der::Input(),
+                                               InputFromString(san), true));
+}
+
+TEST_P(ParseNameConstraints, DNSNames_ExcludeOnly) {
+  std::string a;
+  ASSERT_TRUE(LoadTestNameConstraint("dnsname-excluded", &a));
+
+  NameConstraints name_constraints;
+  EXPECT_TRUE(name_constraints.Parse(InputFromString(a), is_critical()));
+
+  // Only "excluded.permitted.example.com" is excluded, but since no dNSNames
+  // are permitted, everything is excluded.
+  EXPECT_FALSE(name_constraints.IsPermittedDNSName(""));
+  EXPECT_FALSE(name_constraints.IsPermittedDNSName("foo.com"));
+  EXPECT_FALSE(name_constraints.IsPermittedDNSName("permitted.example.com"));
+  EXPECT_FALSE(
+      name_constraints.IsPermittedDNSName("excluded.permitted.example.com"));
+  EXPECT_FALSE(
+      name_constraints.IsPermittedDNSName("a.excluded.permitted.example.com"));
+}
+
+TEST_P(ParseNameConstraints, DNSNames_ExcludeAll) {
+  std::string a;
+  ASSERT_TRUE(LoadTestNameConstraint("dnsname-excludeall", &a));
+
+  NameConstraints name_constraints;
+  EXPECT_TRUE(name_constraints.Parse(InputFromString(a), is_critical()));
+
+  // "permitted.example.com" is in the permitted section, but since "" is
+  // excluded, nothing is permitted.
+  EXPECT_FALSE(name_constraints.IsPermittedDNSName(""));
+  EXPECT_FALSE(name_constraints.IsPermittedDNSName("foo.com"));
+  EXPECT_FALSE(name_constraints.IsPermittedDNSName("permitted.example.com"));
+  EXPECT_FALSE(
+      name_constraints.IsPermittedDNSName("foo.permitted.example.com"));
+}
+
+TEST_P(ParseNameConstraints, DirectoryNames) {
+  std::string constraints_der;
+  ASSERT_TRUE(LoadTestNameConstraint("directoryname", &constraints_der));
+
+  std::string name_us;
+  ASSERT_TRUE(LoadTestName("name-us", &name_us));
+  std::string name_us_ca;
+  ASSERT_TRUE(LoadTestName("name-us-california", &name_us_ca));
+  std::string name_us_ca_mountain_view;
+  ASSERT_TRUE(LoadTestName("name-us-california-mountain_view",
+                           &name_us_ca_mountain_view));
+  std::string name_us_az;
+  ASSERT_TRUE(LoadTestName("name-us-arizona", &name_us_az));
+  std::string name_jp;
+  ASSERT_TRUE(LoadTestName("name-jp", &name_jp));
+  std::string name_jp_tokyo;
+  ASSERT_TRUE(LoadTestName("name-jp-tokyo", &name_jp_tokyo));
+  std::string name_de;
+  ASSERT_TRUE(LoadTestName("name-de", &name_de));
+  std::string name_ca;
+  ASSERT_TRUE(LoadTestName("name-ca", &name_ca));
+
+  NameConstraints name_constraints;
+  EXPECT_TRUE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+
+  // Not in any permitted subtree.
+  EXPECT_FALSE(name_constraints.IsPermittedDirectoryName(
+      SequenceValueFromString(name_ca)));
+  // Within the permitted C=US subtree.
+  EXPECT_TRUE(name_constraints.IsPermittedDirectoryName(
+      SequenceValueFromString(name_us)));
+  // Within the permitted C=US subtree.
+  EXPECT_TRUE(name_constraints.IsPermittedDirectoryName(
+      SequenceValueFromString(name_us_az)));
+  // Within the permitted C=US subtree, however the excluded C=US,ST=California
+  // subtree takes priority.
+  EXPECT_FALSE(name_constraints.IsPermittedDirectoryName(
+      SequenceValueFromString(name_us_ca)));
+  // Within the permitted C=US subtree as well as the permitted
+  // C=US,ST=California,L=Mountain View subtree, however the excluded
+  // C=US,ST=California subtree still takes priority.
+  EXPECT_FALSE(name_constraints.IsPermittedDirectoryName(
+      SequenceValueFromString(name_us_ca_mountain_view)));
+  // Not in any permitted subtree, and also inside the extraneous excluded C=DE
+  // subtree.
+  EXPECT_FALSE(name_constraints.IsPermittedDirectoryName(
+      SequenceValueFromString(name_de)));
+  // Not in any permitted subtree.
+  EXPECT_FALSE(name_constraints.IsPermittedDirectoryName(
+      SequenceValueFromString(name_jp)));
+  // Within the permitted C=JP,ST=Tokyo subtree.
+  EXPECT_TRUE(name_constraints.IsPermittedDirectoryName(
+      SequenceValueFromString(name_jp_tokyo)));
+
+  EXPECT_TRUE(
+      CheckNotPresent(name_constraints, kAllFlags & ~kDirectoryNameFlag));
+
+  // Within the permitted C=US subtree.
+  EXPECT_TRUE(name_constraints.IsPermittedCert(SequenceValueFromString(name_us),
+                                               der::Input(),
+                                               false /* is_leaf_cert */));
+  EXPECT_TRUE(name_constraints.IsPermittedCert(
+      SequenceValueFromString(name_us), der::Input(), true /* is_leaf_cert */));
+  // Within the permitted C=US subtree, however the excluded C=US,ST=California
+  // subtree takes priority.
+  EXPECT_FALSE(
+      name_constraints.IsPermittedCert(SequenceValueFromString(name_us_ca),
+                                       der::Input(), false /* is_leaf_cert */));
+  EXPECT_FALSE(
+      name_constraints.IsPermittedCert(SequenceValueFromString(name_us_ca),
+                                       der::Input(), true /* is_leaf_cert */));
+
+  std::string san;
+  ASSERT_TRUE(LoadTestSubjectAltName("san-permitted", &san));
+  EXPECT_TRUE(name_constraints.IsPermittedCert(der::Input(),
+                                               InputFromString(san), true));
+
+  ASSERT_TRUE(LoadTestSubjectAltName("san-excluded-dnsname", &san));
+  EXPECT_TRUE(name_constraints.IsPermittedCert(der::Input(),
+                                               InputFromString(san), true));
+
+  ASSERT_TRUE(LoadTestSubjectAltName("san-excluded-directoryname", &san));
+  EXPECT_FALSE(name_constraints.IsPermittedCert(der::Input(),
+                                                InputFromString(san), true));
+
+  ASSERT_TRUE(LoadTestSubjectAltName("san-excluded-ipaddress", &san));
+  EXPECT_TRUE(name_constraints.IsPermittedCert(der::Input(),
+                                               InputFromString(san), true));
+}
+
+TEST_P(ParseNameConstraints, DirectoryNames_ExcludeOnly) {
+  std::string constraints_der;
+  ASSERT_TRUE(
+      LoadTestNameConstraint("directoryname-excluded", &constraints_der));
+  NameConstraints name_constraints;
+  EXPECT_TRUE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+
+  std::string name_empty;
+  ASSERT_TRUE(LoadTestName("name-empty", &name_empty));
+  std::string name_us;
+  ASSERT_TRUE(LoadTestName("name-us", &name_us));
+  std::string name_us_ca;
+  ASSERT_TRUE(LoadTestName("name-us-california", &name_us_ca));
+  std::string name_us_ca_mountain_view;
+  ASSERT_TRUE(LoadTestName("name-us-california-mountain_view",
+                           &name_us_ca_mountain_view));
+
+  // Only "C=US,ST=California" is excluded, but since no directoryNames are
+  // permitted, everything is excluded.
+  EXPECT_FALSE(name_constraints.IsPermittedDirectoryName(
+      SequenceValueFromString(name_empty)));
+  EXPECT_FALSE(name_constraints.IsPermittedDirectoryName(
+      SequenceValueFromString(name_us)));
+  EXPECT_FALSE(name_constraints.IsPermittedDirectoryName(
+      SequenceValueFromString(name_us_ca)));
+  EXPECT_FALSE(name_constraints.IsPermittedDirectoryName(
+      SequenceValueFromString(name_us_ca_mountain_view)));
+}
+
+TEST_P(ParseNameConstraints, DirectoryNames_ExcludeAll) {
+  std::string constraints_der;
+  ASSERT_TRUE(
+      LoadTestNameConstraint("directoryname-excluded", &constraints_der));
+  NameConstraints name_constraints;
+  EXPECT_TRUE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+
+  std::string name_empty;
+  ASSERT_TRUE(LoadTestName("name-empty", &name_empty));
+  std::string name_us;
+  ASSERT_TRUE(LoadTestName("name-us", &name_us));
+  std::string name_us_ca;
+  ASSERT_TRUE(LoadTestName("name-us-california", &name_us_ca));
+  std::string name_us_ca_mountain_view;
+  ASSERT_TRUE(LoadTestName("name-us-california-mountain_view",
+                           &name_us_ca_mountain_view));
+  std::string name_jp;
+  ASSERT_TRUE(LoadTestName("name-jp", &name_jp));
+
+  // "C=US" is in the permitted section, but since an empty
+  // directoryName is excluded, nothing is permitted.
+  EXPECT_FALSE(name_constraints.IsPermittedDirectoryName(
+      SequenceValueFromString(name_empty)));
+  EXPECT_FALSE(name_constraints.IsPermittedDirectoryName(
+      SequenceValueFromString(name_us)));
+  EXPECT_FALSE(name_constraints.IsPermittedDirectoryName(
+      SequenceValueFromString(name_us_ca)));
+  EXPECT_FALSE(name_constraints.IsPermittedDirectoryName(
+      SequenceValueFromString(name_jp)));
+}
+
+TEST_P(ParseNameConstraints, IPAdresses) {
+  std::string a;
+  ASSERT_TRUE(LoadTestNameConstraint("ipaddress", &a));
+
+  NameConstraints name_constraints;
+  EXPECT_TRUE(name_constraints.Parse(InputFromString(a), is_critical()));
+
+  // IPv4 tests:
+  {
+    // Not in any permitted range.
+    const uint8_t ip4[] = {192, 169, 0, 1};
+    EXPECT_FALSE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip4, ip4 + arraysize(ip4))));
+  }
+  {
+    // Within the permitted 192.168.0.0/255.255.0.0 range.
+    const uint8_t ip4[] = {192, 168, 0, 1};
+    EXPECT_TRUE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip4, ip4 + arraysize(ip4))));
+  }
+  {
+    // Within the permitted 192.168.0.0/255.255.0.0 range, however the
+    // excluded 192.168.5.0/255.255.255.0 takes priority.
+    const uint8_t ip4[] = {192, 168, 5, 1};
+    EXPECT_FALSE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip4, ip4 + arraysize(ip4))));
+  }
+  {
+    // Within the permitted 192.168.0.0/255.255.0.0 range as well as the
+    // permitted 192.168.5.32/255.255.255.96 range, however the excluded
+    // 192.168.5.0/255.255.255.0 still takes priority.
+    const uint8_t ip4[] = {192, 168, 5, 33};
+    EXPECT_FALSE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip4, ip4 + arraysize(ip4))));
+  }
+  {
+    // Not in any permitted range. (Just outside the 192.167.5.32/255.255.255.96
+    // range.)
+    const uint8_t ip4[] = {192, 167, 5, 31};
+    EXPECT_FALSE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip4, ip4 + arraysize(ip4))));
+  }
+  {
+    // Within the permitted 192.167.5.32/255.255.255.96 range.
+    const uint8_t ip4[] = {192, 167, 5, 32};
+    EXPECT_TRUE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip4, ip4 + arraysize(ip4))));
+  }
+  {
+    // Within the permitted 192.167.5.32/255.255.255.96 range.
+    const uint8_t ip4[] = {192, 167, 5, 63};
+    EXPECT_TRUE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip4, ip4 + arraysize(ip4))));
+  }
+  {
+    // Not in any permitted range. (Just outside the 192.167.5.32/255.255.255.96
+    // range.)
+    const uint8_t ip4[] = {192, 167, 5, 64};
+    EXPECT_FALSE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip4, ip4 + arraysize(ip4))));
+  }
+  {
+    // Not in any permitted range, and also inside the extraneous excluded
+    // 192.166.5.32/255.255.255.96 range.
+    const uint8_t ip4[] = {192, 166, 5, 32};
+    EXPECT_FALSE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip4, ip4 + arraysize(ip4))));
+  }
+
+  // IPv6 tests:
+  {
+    // Not in any permitted range.
+    const uint8_t ip6[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 0, 0, 0, 1};
+    EXPECT_FALSE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip6, ip6 + arraysize(ip6))));
+  }
+  {
+    // Within the permitted
+    // 102:304:506:708:90a:b0c::/ffff:ffff:ffff:ffff:ffff:ffff:: range.
+    const uint8_t ip6[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 0, 0, 0, 1};
+    EXPECT_TRUE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip6, ip6 + arraysize(ip6))));
+  }
+  {
+    // Within the permitted
+    // 102:304:506:708:90a:b0c::/ffff:ffff:ffff:ffff:ffff:ffff:: range, however
+    // the excluded
+    // 102:304:506:708:90a:b0c:500:0/ffff:ffff:ffff:ffff:ffff:ffff:ff00:0 takes
+    // priority.
+    const uint8_t ip6[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 5, 0, 0, 1};
+    EXPECT_FALSE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip6, ip6 + arraysize(ip6))));
+  }
+  {
+    // Within the permitted
+    // 102:304:506:708:90a:b0c::/ffff:ffff:ffff:ffff:ffff:ffff:: range as well
+    // as the permitted
+    // 102:304:506:708:90a:b0c:520:0/ffff:ffff:ffff:ffff:ffff:ffff:ff60:0,
+    // however the excluded
+    // 102:304:506:708:90a:b0c:500:0/ffff:ffff:ffff:ffff:ffff:ffff:ff00:0 takes
+    // priority.
+    const uint8_t ip6[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 5, 33, 0, 1};
+    EXPECT_FALSE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip6, ip6 + arraysize(ip6))));
+  }
+  {
+    // Not in any permitted range. (Just outside the
+    // 102:304:506:708:90a:b0b:520:0/ffff:ffff:ffff:ffff:ffff:ffff:ff60:0
+    // range.)
+    const uint8_t ip6[] = {1, 2,  3,  4,  5, 6,  7,   8,
+                           9, 10, 11, 11, 5, 31, 255, 255};
+    EXPECT_FALSE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip6, ip6 + arraysize(ip6))));
+  }
+  {
+    // Within the permitted
+    // 102:304:506:708:90a:b0b:520:0/ffff:ffff:ffff:ffff:ffff:ffff:ff60:0 range.
+    const uint8_t ip6[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 11, 5, 32, 0, 0};
+    EXPECT_TRUE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip6, ip6 + arraysize(ip6))));
+  }
+  {
+    // Within the permitted
+    // 102:304:506:708:90a:b0b:520:0/ffff:ffff:ffff:ffff:ffff:ffff:ff60:0 range.
+    const uint8_t ip6[] = {1, 2,  3,  4,  5, 6,  7,   8,
+                           9, 10, 11, 11, 5, 63, 255, 255};
+    EXPECT_TRUE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip6, ip6 + arraysize(ip6))));
+  }
+  {
+    // Not in any permitted range. (Just outside the
+    // 102:304:506:708:90a:b0b:520:0/ffff:ffff:ffff:ffff:ffff:ffff:ff60:0
+    // range.)
+    const uint8_t ip6[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 11, 5, 64, 0, 0};
+    EXPECT_FALSE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip6, ip6 + arraysize(ip6))));
+  }
+  {
+    // Not in any permitted range, and also inside the extraneous excluded
+    // 102:304:506:708:90a:b0a:520:0/ffff:ffff:ffff:ffff:ffff:ffff:ff60:0 range.
+    const uint8_t ip6[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 10, 5, 33, 0, 1};
+    EXPECT_FALSE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip6, ip6 + arraysize(ip6))));
+  }
+
+  EXPECT_TRUE(CheckNotPresent(name_constraints, kAllFlags & ~kIpAddressFlag));
+
+  std::string san;
+  ASSERT_TRUE(LoadTestSubjectAltName("san-permitted", &san));
+  EXPECT_TRUE(name_constraints.IsPermittedCert(der::Input(),
+                                               InputFromString(san), true));
+
+  ASSERT_TRUE(LoadTestSubjectAltName("san-excluded-dnsname", &san));
+  EXPECT_TRUE(name_constraints.IsPermittedCert(der::Input(),
+                                               InputFromString(san), true));
+
+  ASSERT_TRUE(LoadTestSubjectAltName("san-excluded-directoryname", &san));
+  EXPECT_TRUE(name_constraints.IsPermittedCert(der::Input(),
+                                               InputFromString(san), true));
+
+  ASSERT_TRUE(LoadTestSubjectAltName("san-excluded-ipaddress", &san));
+  EXPECT_FALSE(name_constraints.IsPermittedCert(der::Input(),
+                                                InputFromString(san), true));
+}
+
+TEST_P(ParseNameConstraints, IPAdresses_ExcludeOnly) {
+  std::string a;
+  ASSERT_TRUE(LoadTestNameConstraint("ipaddress-excluded", &a));
+
+  NameConstraints name_constraints;
+  EXPECT_TRUE(name_constraints.Parse(InputFromString(a), is_critical()));
+
+  // Only 192.168.5.0/255.255.255.0 is excluded, but since no iPAddresses
+  // are permitted, everything is excluded.
+  {
+    const uint8_t ip4[] = {192, 168, 0, 1};
+    EXPECT_FALSE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip4, ip4 + arraysize(ip4))));
+  }
+  {
+    const uint8_t ip4[] = {192, 168, 5, 1};
+    EXPECT_FALSE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip4, ip4 + arraysize(ip4))));
+  }
+  {
+    const uint8_t ip6[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 0, 0, 0, 1};
+    EXPECT_FALSE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip6, ip6 + arraysize(ip6))));
+  }
+}
+
+TEST_P(ParseNameConstraints, IPAdresses_ExcludeAll) {
+  std::string a;
+  ASSERT_TRUE(LoadTestNameConstraint("ipaddress-excludeall", &a));
+
+  NameConstraints name_constraints;
+  EXPECT_TRUE(name_constraints.Parse(InputFromString(a), is_critical()));
+
+  // 192.168.0.0/255.255.0.0 and
+  // 102:304:506:708:90a:b0c::/ffff:ffff:ffff:ffff:ffff:ffff:: are permitted,
+  // but since 0.0.0.0/0 and ::/0 are excluded nothing is permitted.
+  {
+    const uint8_t ip4[] = {192, 168, 0, 1};
+    EXPECT_FALSE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip4, ip4 + arraysize(ip4))));
+  }
+  {
+    const uint8_t ip4[] = {1, 1, 1, 1};
+    EXPECT_FALSE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip4, ip4 + arraysize(ip4))));
+  }
+  {
+    const uint8_t ip6[] = {2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1};
+    EXPECT_FALSE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip6, ip6 + arraysize(ip6))));
+  }
+  {
+    const uint8_t ip6[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 0, 0, 0, 1};
+    EXPECT_FALSE(name_constraints.IsPermittedIP(
+        IPAddressNumber(ip6, ip6 + arraysize(ip6))));
+  }
+}
+
+TEST_P(ParseNameConstraints, otherNamesInPermitted) {
+  std::string constraints_der;
+  ASSERT_TRUE(LoadTestNameConstraint("othername-permitted", &constraints_der));
+  NameConstraints name_constraints;
+  EXPECT_TRUE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+
+  if (is_critical()) {
+    EXPECT_FALSE(name_constraints.IsPermittedOtherName());
+    EXPECT_TRUE(CheckNotPresent(name_constraints, kAllFlags & ~kOtherNameFlag));
+  } else {
+    EXPECT_TRUE(CheckNotPresent(name_constraints, kAllFlags));
+  }
+}
+
+TEST_P(ParseNameConstraints, otherNamesInExcluded) {
+  std::string constraints_der;
+  ASSERT_TRUE(LoadTestNameConstraint("othername-excluded", &constraints_der));
+  NameConstraints name_constraints;
+  EXPECT_TRUE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+
+  if (is_critical()) {
+    EXPECT_FALSE(name_constraints.IsPermittedOtherName());
+    EXPECT_TRUE(CheckNotPresent(name_constraints, kAllFlags & ~kOtherNameFlag));
+  } else {
+    EXPECT_TRUE(CheckNotPresent(name_constraints, kAllFlags));
+  }
+}
+
+TEST_P(ParseNameConstraints, Rfc822NamesInPermitted) {
+  std::string constraints_der;
+  ASSERT_TRUE(LoadTestNameConstraint("rfc822name-permitted", &constraints_der));
+  NameConstraints name_constraints;
+  EXPECT_TRUE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+
+  if (is_critical()) {
+    EXPECT_FALSE(name_constraints.IsPermittedRFC822Name());
+    EXPECT_TRUE(
+        CheckNotPresent(name_constraints, kAllFlags & ~kRfc822NameFlag));
+  } else {
+    EXPECT_TRUE(CheckNotPresent(name_constraints, kAllFlags));
+  }
+}
+
+TEST_P(ParseNameConstraints, Rfc822NamesInExcluded) {
+  std::string constraints_der;
+  ASSERT_TRUE(LoadTestNameConstraint("rfc822name-excluded", &constraints_der));
+  NameConstraints name_constraints;
+  EXPECT_TRUE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+
+  if (is_critical()) {
+    EXPECT_FALSE(name_constraints.IsPermittedRFC822Name());
+    EXPECT_TRUE(
+        CheckNotPresent(name_constraints, kAllFlags & ~kRfc822NameFlag));
+  } else {
+    EXPECT_TRUE(CheckNotPresent(name_constraints, kAllFlags));
+  }
+}
+
+TEST_P(ParseNameConstraints, x400AddresssInPermitted) {
+  std::string constraints_der;
+  ASSERT_TRUE(
+      LoadTestNameConstraint("x400address-permitted", &constraints_der));
+  NameConstraints name_constraints;
+  EXPECT_TRUE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+
+  if (is_critical()) {
+    EXPECT_FALSE(name_constraints.IsPermittedX400Address());
+    EXPECT_TRUE(
+        CheckNotPresent(name_constraints, kAllFlags & ~kX400AddressFlag));
+  } else {
+    EXPECT_TRUE(CheckNotPresent(name_constraints, kAllFlags));
+  }
+}
+
+TEST_P(ParseNameConstraints, x400AddresssInExcluded) {
+  std::string constraints_der;
+  ASSERT_TRUE(LoadTestNameConstraint("x400address-excluded", &constraints_der));
+  NameConstraints name_constraints;
+  EXPECT_TRUE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+
+  if (is_critical()) {
+    EXPECT_FALSE(name_constraints.IsPermittedX400Address());
+    EXPECT_TRUE(
+        CheckNotPresent(name_constraints, kAllFlags & ~kX400AddressFlag));
+  } else {
+    EXPECT_TRUE(CheckNotPresent(name_constraints, kAllFlags));
+  }
+}
+
+TEST_P(ParseNameConstraints, ediPartyNamesInPermitted) {
+  std::string constraints_der;
+  ASSERT_TRUE(
+      LoadTestNameConstraint("edipartyname-permitted", &constraints_der));
+  NameConstraints name_constraints;
+  EXPECT_TRUE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+
+  if (is_critical()) {
+    EXPECT_FALSE(name_constraints.IsPermittedEdiPartyName());
+    EXPECT_TRUE(
+        CheckNotPresent(name_constraints, kAllFlags & ~kEdiPartyNameFlag));
+  } else {
+    EXPECT_TRUE(CheckNotPresent(name_constraints, kAllFlags));
+  }
+}
+
+TEST_P(ParseNameConstraints, ediPartyNamesInExcluded) {
+  std::string constraints_der;
+  ASSERT_TRUE(
+      LoadTestNameConstraint("edipartyname-excluded", &constraints_der));
+  NameConstraints name_constraints;
+  EXPECT_TRUE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+
+  if (is_critical()) {
+    EXPECT_FALSE(name_constraints.IsPermittedEdiPartyName());
+    EXPECT_TRUE(
+        CheckNotPresent(name_constraints, kAllFlags & ~kEdiPartyNameFlag));
+  } else {
+    EXPECT_TRUE(CheckNotPresent(name_constraints, kAllFlags));
+  }
+}
+
+TEST_P(ParseNameConstraints, registeredIDsInPermitted) {
+  std::string constraints_der;
+  ASSERT_TRUE(
+      LoadTestNameConstraint("registeredid-permitted", &constraints_der));
+  NameConstraints name_constraints;
+  EXPECT_TRUE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+
+  if (is_critical()) {
+    EXPECT_FALSE(name_constraints.IsPermittedRegisteredId());
+    EXPECT_TRUE(
+        CheckNotPresent(name_constraints, kAllFlags & ~kRegisteredIdFlag));
+  } else {
+    EXPECT_TRUE(CheckNotPresent(name_constraints, kAllFlags));
+  }
+}
+
+TEST_P(ParseNameConstraints, registeredIDsInExcluded) {
+  std::string constraints_der;
+  ASSERT_TRUE(
+      LoadTestNameConstraint("registeredid-excluded", &constraints_der));
+  NameConstraints name_constraints;
+  EXPECT_TRUE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+
+  if (is_critical()) {
+    EXPECT_FALSE(name_constraints.IsPermittedRegisteredId());
+    EXPECT_TRUE(
+        CheckNotPresent(name_constraints, kAllFlags & ~kRegisteredIdFlag));
+  } else {
+    EXPECT_TRUE(CheckNotPresent(name_constraints, kAllFlags));
+  }
+}
+
+TEST_P(ParseNameConstraints,
+       failsOnGeneralSubtreeWithMinimumZeroEncodedUnnecessarily) {
+  std::string constraints_der;
+  ASSERT_TRUE(LoadTestNameConstraint("dnsname-with_min_0", &constraints_der));
+  NameConstraints name_constraints;
+  // The value should not be in the DER encoding if it is the default. But this
+  // could be changed to allowed if there are buggy encoders out there that
+  // include it anyway.
+  EXPECT_FALSE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+}
+
+TEST_P(ParseNameConstraints, failsOnGeneralSubtreeWithMinimum) {
+  std::string constraints_der;
+  ASSERT_TRUE(LoadTestNameConstraint("dnsname-with_min_1", &constraints_der));
+  NameConstraints name_constraints;
+  // Could handle this more gracefully (see TODO in ParseGeneralSubtrees).
+  EXPECT_FALSE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+}
+
+TEST_P(ParseNameConstraints,
+       failsOnGeneralSubtreeWithMinimumZeroEncodedUnnecessarilyAndMaximum) {
+  std::string constraints_der;
+  ASSERT_TRUE(
+      LoadTestNameConstraint("dnsname-with_min_0_and_max", &constraints_der));
+  NameConstraints name_constraints;
+  // Could handle this more gracefully (see TODO in ParseGeneralSubtrees).
+  EXPECT_FALSE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+}
+
+TEST_P(ParseNameConstraints, failsOnGeneralSubtreeWithMinimumAndMaximum) {
+  std::string constraints_der;
+  ASSERT_TRUE(
+      LoadTestNameConstraint("dnsname-with_min_1_and_max", &constraints_der));
+  NameConstraints name_constraints;
+  // Could handle this more gracefully (see TODO in ParseGeneralSubtrees).
+  EXPECT_FALSE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+}
+
+TEST_P(ParseNameConstraints, failsOnGeneralSubtreeWithMaximum) {
+  std::string constraints_der;
+  ASSERT_TRUE(LoadTestNameConstraint("dnsname-with_max", &constraints_der));
+  NameConstraints name_constraints;
+  // Could handle this more gracefully (see TODO in ParseGeneralSubtrees).
+  EXPECT_FALSE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+}
+
+TEST_P(ParseNameConstraints, failsOnEmptyExtensionValue) {
+  std::string constraints_der = "";
+  NameConstraints name_constraints;
+  EXPECT_FALSE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+}
+
+TEST_P(ParseNameConstraints, failsOnEmptyPermittedAndExcluded) {
+  std::string constraints_der;
+  ASSERT_TRUE(LoadTestNameConstraint("invalid-no_subtrees", &constraints_der));
+  NameConstraints name_constraints;
+  EXPECT_FALSE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+}
+
+TEST_P(ParseNameConstraints, IsPermittedCert_SubjectEmailAddress_ok) {
+  std::string constraints_der;
+  ASSERT_TRUE(LoadTestNameConstraint("directoryname", &constraints_der));
+  NameConstraints name_constraints;
+  EXPECT_TRUE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+
+  std::string name_us_arizona_email;
+  ASSERT_TRUE(LoadTestName("name-us-arizona-email", &name_us_arizona_email));
+
+  // Name constraints don't contain rfc822Name, so emailAddress in subject is
+  // allowed regardless.
+  EXPECT_TRUE(name_constraints.IsPermittedCert(
+      SequenceValueFromString(name_us_arizona_email), der::Input(),
+      true /* is_leaf_cert */));
+  EXPECT_TRUE(name_constraints.IsPermittedCert(
+      SequenceValueFromString(name_us_arizona_email), der::Input(),
+      false /* is_leaf_cert */));
+}
+
+TEST_P(ParseNameConstraints, IsPermittedCert_SubjectEmailAddress_notok) {
+  std::string constraints_der;
+  ASSERT_TRUE(LoadTestNameConstraint("rfc822name-permitted", &constraints_der));
+  NameConstraints name_constraints;
+  EXPECT_TRUE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+
+  std::string name_us_arizona_email;
+  ASSERT_TRUE(LoadTestName("name-us-arizona-email", &name_us_arizona_email));
+
+  // Name constraints contain rfc822Name, so emailAddress in subject is not
+  // allowed if the constraints were critical.
+  EXPECT_EQ(!is_critical(), name_constraints.IsPermittedCert(
+                                SequenceValueFromString(name_us_arizona_email),
+                                der::Input(), true /* is_leaf_cert */));
+  EXPECT_EQ(!is_critical(), name_constraints.IsPermittedCert(
+                                SequenceValueFromString(name_us_arizona_email),
+                                der::Input(), false /* is_leaf_cert */));
+}
+
+TEST_P(ParseNameConstraints, IsPermittedCert_SubjectDnsNames) {
+  std::string constraints_der;
+  ASSERT_TRUE(LoadTestNameConstraint("dnsname", &constraints_der));
+  NameConstraints name_constraints;
+  EXPECT_TRUE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+
+  ASSERT_TRUE(LoadTestNameConstraint("directoryname", &constraints_der));
+  // This is a bit of a hack, but Parse can be called multiple times to load
+  // different constraints into the same object (doesn't do a proper merge, but
+  // good enough for this test).
+  EXPECT_TRUE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+
+  std::string name_us_az;
+  ASSERT_TRUE(LoadTestName("name-us-arizona", &name_us_az));
+  std::string name_us_az_foocom;
+  ASSERT_TRUE(LoadTestName("name-us-arizona-foo.com", &name_us_az_foocom));
+
+  // foo.com is not within the permitted dNSName constraints:
+  EXPECT_FALSE(name_constraints.IsPermittedCert(
+      SequenceValueFromString(name_us_az_foocom), der::Input(),
+      true /* is_leaf_cert */));
+  // commonName check is only done for leaf certs, so this is allowed:
+  EXPECT_TRUE(name_constraints.IsPermittedCert(
+      SequenceValueFromString(name_us_az_foocom), der::Input(),
+      false /* is_leaf_cert */));
+
+  std::string name_us_az_permitted;
+  ASSERT_TRUE(LoadTestName("name-us-arizona-permitted.example.com",
+                           &name_us_az_permitted));
+  // permitted.example.com is within the permitted dNSName constraints and the
+  // permitted C=US directoryName constraint:
+  EXPECT_TRUE(name_constraints.IsPermittedCert(
+      SequenceValueFromString(name_us_az_permitted), der::Input(),
+      true /* is_leaf_cert */));
+  EXPECT_TRUE(name_constraints.IsPermittedCert(
+      SequenceValueFromString(name_us_az_permitted), der::Input(),
+      false /* is_leaf_cert */));
+
+  std::string name_us_ca_permitted;
+  ASSERT_TRUE(LoadTestName("name-us-california-permitted.example.com",
+                           &name_us_ca_permitted));
+  // permitted.example.com is within the permitted dNSName constraints but the
+  // subject is within the excluded C=US,ST=California directoryName, so not
+  // allowed anyway:
+  EXPECT_FALSE(name_constraints.IsPermittedCert(
+      SequenceValueFromString(name_us_ca_permitted), der::Input(),
+      true /* is_leaf_cert */));
+  EXPECT_FALSE(name_constraints.IsPermittedCert(
+      SequenceValueFromString(name_us_ca_permitted), der::Input(),
+      false /* is_leaf_cert */));
+
+  // As a leaf cert with no SubjectAltName, the subject is expected to have a
+  // host in commonName, this subject has no commonName field, so fails:
+  EXPECT_FALSE(
+      name_constraints.IsPermittedCert(SequenceValueFromString(name_us_az),
+                                       der::Input(), true /* is_leaf_cert */));
+  // Within the permitted C=US subtree, not a leaf cert, so does not need
+  // a host in commonName.
+  EXPECT_TRUE(
+      name_constraints.IsPermittedCert(SequenceValueFromString(name_us_az),
+                                       der::Input(), false /* is_leaf_cert */));
+}
+
+TEST_P(ParseNameConstraints, IsPermittedCert_SubjectIpAddresses) {
+  std::string constraints_der;
+  ASSERT_TRUE(LoadTestNameConstraint("ipaddress", &constraints_der));
+  NameConstraints name_constraints;
+  EXPECT_TRUE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+
+  ASSERT_TRUE(LoadTestNameConstraint("directoryname", &constraints_der));
+  // This is a bit of a hack, but Parse can be called multiple times to load
+  // different constraints into the same object (doesn't do a proper merge, but
+  // good enough for this test).
+  EXPECT_TRUE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+  ASSERT_TRUE(LoadTestNameConstraint("dnsname", &constraints_der));
+  EXPECT_TRUE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+
+  std::string name_us_az;
+  ASSERT_TRUE(LoadTestName("name-us-arizona", &name_us_az));
+  std::string name_us_az_1_1_1_1;
+  ASSERT_TRUE(LoadTestName("name-us-arizona-1.1.1.1", &name_us_az_1_1_1_1));
+
+  // 1.1.1.1 is not within the permitted iPAddress constraints:
+  EXPECT_FALSE(name_constraints.IsPermittedCert(
+      SequenceValueFromString(name_us_az_1_1_1_1), der::Input(),
+      true /* is_leaf_cert */));
+  // commonName check is only done for leaf certs, so this is allowed:
+  EXPECT_TRUE(name_constraints.IsPermittedCert(
+      SequenceValueFromString(name_us_az_1_1_1_1), der::Input(),
+      false /* is_leaf_cert */));
+
+  std::string name_us_az_192_168_1_1;
+  ASSERT_TRUE(
+      LoadTestName("name-us-arizona-192.168.1.1", &name_us_az_192_168_1_1));
+  // 192.168.1.1 is within the permitted iPAddress constraints and the
+  // permitted C=US directoryName constraint:
+  EXPECT_TRUE(name_constraints.IsPermittedCert(
+      SequenceValueFromString(name_us_az_192_168_1_1), der::Input(),
+      true /* is_leaf_cert */));
+  EXPECT_TRUE(name_constraints.IsPermittedCert(
+      SequenceValueFromString(name_us_az_192_168_1_1), der::Input(),
+      false /* is_leaf_cert */));
+
+  std::string name_us_ca_192_168_1_1;
+  ASSERT_TRUE(
+      LoadTestName("name-us-california-192.168.1.1", &name_us_ca_192_168_1_1));
+  // 192.168.1.1 is within the permitted iPAddress constraints but the
+  // subject is within the excluded C=US,ST=California directoryName, so not
+  // allowed anyway:
+  EXPECT_FALSE(name_constraints.IsPermittedCert(
+      SequenceValueFromString(name_us_ca_192_168_1_1), der::Input(),
+      true /* is_leaf_cert */));
+  EXPECT_FALSE(name_constraints.IsPermittedCert(
+      SequenceValueFromString(name_us_ca_192_168_1_1), der::Input(),
+      false /* is_leaf_cert */));
+
+  std::string name_us_az_ipv6;
+  ASSERT_TRUE(LoadTestName("name-us-arizona-ipv6", &name_us_az_ipv6));
+  // 102:304:506:708:90a:b0c::1 is within the permitted iPAddress constraints
+  // and the permitted C=US directoryName constraint, but Chrome only handles
+  // IPv4 addresses in commonName so the address will be checked against dNSName
+  // constraints instead, which will not match any permitted names.
+  EXPECT_FALSE(
+      name_constraints.IsPermittedCert(SequenceValueFromString(name_us_az_ipv6),
+                                       der::Input(), true /* is_leaf_cert */));
+  EXPECT_TRUE(
+      name_constraints.IsPermittedCert(SequenceValueFromString(name_us_az_ipv6),
+                                       der::Input(), false /* is_leaf_cert */));
+
+  // As a leaf cert with no SubjectAltName, the subject is expected to have a
+  // host in commonName, this subject has no commonName field, so fails:
+  EXPECT_FALSE(
+      name_constraints.IsPermittedCert(SequenceValueFromString(name_us_az),
+                                       der::Input(), true /* is_leaf_cert */));
+  // Within the permitted C=US subtree, not a leaf cert, so does not need
+  // a host in commonName.
+  EXPECT_TRUE(
+      name_constraints.IsPermittedCert(SequenceValueFromString(name_us_az),
+                                       der::Input(), false /* is_leaf_cert */));
+}
+
+TEST_P(ParseNameConstraints, IsPermittedCert_Subject_commonName_encodings) {
+  std::string constraints_der;
+  ASSERT_TRUE(LoadTestNameConstraint("ipaddress", &constraints_der));
+  NameConstraints name_constraints;
+  EXPECT_TRUE(
+      name_constraints.Parse(InputFromString(constraints_der), is_critical()));
+
+  // CommonName encoded as BMPString: should work since we convert to UTF8
+  // before parsing.
+  std::string name_us_az_192_168_1_1_bmp;
+  ASSERT_TRUE(LoadTestName("name-us-arizona-192.168.1.1-bmp",
+                           &name_us_az_192_168_1_1_bmp));
+  EXPECT_TRUE(name_constraints.IsPermittedCert(
+      SequenceValueFromString(name_us_az_192_168_1_1_bmp), der::Input(),
+      true /* is_leaf_cert */));
+  EXPECT_TRUE(name_constraints.IsPermittedCert(
+      SequenceValueFromString(name_us_az_192_168_1_1_bmp), der::Input(),
+      false /* is_leaf_cert */));
+
+  // CommonName encoded as TeletexString: should not work, TeletexString is not
+  // supported.
+  std::string name_us_az_192_168_1_1_t61;
+  ASSERT_TRUE(LoadTestName("name-us-arizona-192.168.1.1-t61",
+                           &name_us_az_192_168_1_1_t61));
+  EXPECT_FALSE(name_constraints.IsPermittedCert(
+      SequenceValueFromString(name_us_az_192_168_1_1_t61), der::Input(),
+      true /* is_leaf_cert */));
+  // If it's not a leaf cert, commonName is not checked, so this is allowed.
+  EXPECT_TRUE(name_constraints.IsPermittedCert(
+      SequenceValueFromString(name_us_az_192_168_1_1_t61), der::Input(),
+      false /* is_leaf_cert */));
+}
+
+}  // namespace net