Implement the ability to whitelist certs from specific issuers

net/cert/cert_verify_proc_whitelist_unittest.cc

+// Copyright (c) 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/cert_verify_proc_whitelist.h"
+
+#include "base/memory/ref_counted.h"
+#include "net/base/test_data_directory.h"
+#include "net/cert/x509_certificate.h"
+#include "net/test/cert_test_util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace net {
+
+namespace {
+
+HashValue GetTestHashValue(uint8_t label, HashValueTag tag) {
+  HashValue hash_value(tag);
+  memset(hash_value.data(), label, hash_value.size());
+  return hash_value;
+}
+
+HashValueVector GetFakeHashValues() {
+  HashValueVector public_key_hashes;
+
+  // Fake "root" hash
+  public_key_hashes.push_back(GetTestHashValue(0x00, HASH_VALUE_SHA256));
+  public_key_hashes.push_back(GetTestHashValue(0x01, HASH_VALUE_SHA1));
+  // Fake "intermediate" hash
+  public_key_hashes.push_back(GetTestHashValue(0x02, HASH_VALUE_SHA256));
+  public_key_hashes.push_back(GetTestHashValue(0x03, HASH_VALUE_SHA1));
+  // Fake "leaf" hash
+  public_key_hashes.push_back(GetTestHashValue(0x04, HASH_VALUE_SHA256));
+  public_key_hashes.push_back(GetTestHashValue(0x05, HASH_VALUE_SHA1));
+
+  return public_key_hashes;
+}
+
+// The SHA-256 hash of the leaf cert "ok_cert.pem"; obtainable either
+// via X509Certificate::CalculateFingerprint256 or
+// openssl x509 -inform pem -in ok_cert.pem -outform der | openssl
+//   dgst -sha256 -c
+const uint8_t kWhitelistCerts[][crypto::kSHA256Length] = {
+    /* clang-format off */
+  { 0xf4, 0x42, 0xdd, 0x66, 0xfa, 0x10, 0x70, 0x65,
+    0xd1, 0x7e, 0xd9, 0xbb, 0x7c, 0xa9, 0x3c, 0x79,
+    0x63, 0xbe, 0x01, 0xa7, 0x54, 0x18, 0xab, 0x2f,
+    0xc3, 0x9a, 0x14, 0x53, 0xc3, 0x83, 0xa0, 0x5a },
+    /* clang-format on */
+};
+
+TEST(CertVerifyProcWhitelistTest, AcceptsWhitelistedEEByRoot) {
+  scoped_refptr<X509Certificate> cert =
+      ImportCertFromFile(GetTestCertsDirectory(), "ok_cert.pem");
+  ASSERT_TRUE(cert);
+
+  // clang-format off
+  const PublicKeyWhitelist kWhitelist[] = {
+      { { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
+        kWhitelistCerts, arraysize(kWhitelistCerts)
+      },
+  };
+  // clang-format on
+
+  SetCertificateWhitelistForTesting(kWhitelist, arraysize(kWhitelist));
+
+  HashValueVector public_key_hashes = GetFakeHashValues();
+
+  // Should return false, indicating this cert is acceptable because of
+  // it being whitelisted.
+  EXPECT_FALSE(IsNonWhitelistedCertificate(*cert, public_key_hashes));
+
+  SetCertificateWhitelistForTesting(nullptr, 0);
+}
+
+TEST(CertVerifyProcWhitelistTest, AcceptsWhitelistedEEByIntermediate) {
+  scoped_refptr<X509Certificate> cert =
+      ImportCertFromFile(GetTestCertsDirectory(), "ok_cert.pem");
+  ASSERT_TRUE(cert);
+
+  // clang-format off
+  const PublicKeyWhitelist kWhitelist[] = {
+      { { 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
+          0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
+          0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
+          0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02 },
+        kWhitelistCerts, arraysize(kWhitelistCerts)
+      },
+  };
+  // clang-format on
+
+  SetCertificateWhitelistForTesting(kWhitelist, arraysize(kWhitelist));
+
+  HashValueVector public_key_hashes = GetFakeHashValues();
+
+  // Should return false, indicating this cert is acceptable because of
+  // it being whitelisted.
+  EXPECT_FALSE(IsNonWhitelistedCertificate(*cert, public_key_hashes));
+
+  SetCertificateWhitelistForTesting(nullptr, 0);
+}
+
+TEST(CertVerifyProcWhitelistTest, RejectsNonWhitelistedEE) {
+  scoped_refptr<X509Certificate> cert =
+      ImportCertFromFile(GetTestCertsDirectory(), "expired_cert.pem");
+  ASSERT_TRUE(cert);
+
+  // clang-format off
+  const PublicKeyWhitelist kWhitelist[] = {
+      { { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
+        kWhitelistCerts, arraysize(kWhitelistCerts)
+      },
+  };
+  // clang-format on
+
+  SetCertificateWhitelistForTesting(kWhitelist, arraysize(kWhitelist));
+
+  HashValueVector public_key_hashes = GetFakeHashValues();
+
+  // Should return true, indicating this certificate chains to a constrained
+  // root and is not whitelisted.
+  EXPECT_TRUE(IsNonWhitelistedCertificate(*cert, public_key_hashes));
+
+  SetCertificateWhitelistForTesting(nullptr, 0);
+}
+
+TEST(CertVerifyProcWhitelistTest, RejectsNonWhitelistedEEByIntermediate) {
+  scoped_refptr<X509Certificate> cert =
+      ImportCertFromFile(GetTestCertsDirectory(), "expired_cert.pem");
+  ASSERT_TRUE(cert);
+
+  // clang-format off
+  const PublicKeyWhitelist kWhitelist[] = {
+      { { 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
+          0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
+          0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
+          0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02 },
+        kWhitelistCerts, arraysize(kWhitelistCerts)
+      },
+  };
+  // clang-format on
+
+  SetCertificateWhitelistForTesting(kWhitelist, arraysize(kWhitelist));
+
+  HashValueVector public_key_hashes = GetFakeHashValues();
+
+  // Should return true, indicating this certificate chains to a constrained
+  // root and is not whitelisted.
+  EXPECT_TRUE(IsNonWhitelistedCertificate(*cert, public_key_hashes));
+
+  SetCertificateWhitelistForTesting(nullptr, 0);
+}
+
+TEST(CertVerifyProcWhitelistTest, AcceptsUnconstrainedLeaf) {
+  scoped_refptr<X509Certificate> cert =
+      ImportCertFromFile(GetTestCertsDirectory(), "ok_cert.pem");
+  ASSERT_TRUE(cert);
+
+  // clang-format off
+  const PublicKeyWhitelist kWhitelist[] = {
+      { { 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
+          0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
+          0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
+          0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10 },
+        kWhitelistCerts, arraysize(kWhitelistCerts)
+      },
+  };
+  // clang-format on
+
+  SetCertificateWhitelistForTesting(kWhitelist, arraysize(kWhitelist));
+
+  HashValueVector public_key_hashes = GetFakeHashValues();
+
+  // Should return false, because the chain (as indicated by
+  // public_key_hashes) is not constrained.
+  EXPECT_FALSE(IsNonWhitelistedCertificate(*cert, public_key_hashes));
+
+  SetCertificateWhitelistForTesting(nullptr, 0);
+}
+
+}  // namespace
+
+}  // namespace net