Disable commonName matching for certificates

net/cert/cert_verify_proc_unittest.cc

 // Copyright (c) 2012 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.h"
 
 #include <vector>
 
 #include "base/callback_helpers.h"
 #include "base/files/file_path.h"
@@ skipping 1783 matching lines @@
 // Should not match the dNSName SAN
 TEST_F(CertVerifyProcNameTest, DoesntMatchDnsSanLeadingAndTrailingDot) {
   VerifyCertName(".test.example.", false);
 }
 
 // Should not match the dNSName SAN
 TEST_F(CertVerifyProcNameTest, DoesntMatchDnsSanTrailingDot) {
   VerifyCertName(".test.example", false);
 }
 
+// Tests that commonName-fallback is handled correctly:
+// - If it's a publicly trusted certificate, the commonName should never
+//   match.
+// - If it chains to a private root, the commonName should not match if
+//   the subjectAltName is absent, and the flags don't allow fallback.
+// - If it chains to a private root, the commonName SHOULD match iff the
+//   subjectAltName is absent and the flags allow a fallback.
+TEST_F(CertVerifyProcNameTest, HandlesCommonNameFallbackLocalAnchors) {
+  scoped_refptr<X509Certificate> cert(
+      ImportCertFromFile(GetTestCertsDirectory(), "salesforce_com_test.pem"));
+  ASSERT_TRUE(cert);
+
+  CertVerifyResult result;
+  scoped_refptr<CertVerifyProc> verify_proc;
+  CertVerifyResult verify_result;
+  int error;
+
+  // Publicly trusted: Always ignores commonName, regardless of flags.
+  result = CertVerifyResult();
+  verify_result = CertVerifyResult();
+  error = 0;
+  result.is_issued_by_known_root = true;
+  verify_proc = new MockCertVerifyProc(result);
+  error = verify_proc->Verify(cert.get(), "prerelna1.pre.salesforce.com",
+                              std::string(), 0, nullptr, CertificateList(),
+                              &verify_result);
+  EXPECT_THAT(error, IsError(ERR_CERT_COMMON_NAME_INVALID));
+  EXPECT_TRUE(verify_result.cert_status & CERT_STATUS_COMMON_NAME_INVALID);
+
+  result = CertVerifyResult();
+  verify_result = CertVerifyResult();
+  error = 0;
+  result.is_issued_by_known_root = true;
+  verify_proc = new MockCertVerifyProc(result);
+  error = verify_proc->Verify(
+      cert.get(), "prerelna1.pre.salesforce.com", std::string(),
+      CertVerifier::VERIFY_ENABLE_COMMON_NAME_FALLBACK_LOCAL_ANCHORS, nullptr,
+      CertificateList(), &verify_result);
+  EXPECT_THAT(error, IsError(ERR_CERT_COMMON_NAME_INVALID));
+  EXPECT_TRUE(verify_result.cert_status & CERT_STATUS_COMMON_NAME_INVALID);
+
+  // Privately trusted: Ignores commonName by default.
+  result = CertVerifyResult();
+  verify_result = CertVerifyResult();
+  error = 0;
+  result.is_issued_by_known_root = false;
+  verify_proc = new MockCertVerifyProc(result);
+  error = verify_proc->Verify(cert.get(), "prerelna1.pre.salesforce.com",
+                              std::string(), 0, nullptr, CertificateList(),
+                              &verify_result);
+  EXPECT_THAT(error, IsError(ERR_CERT_COMMON_NAME_INVALID));
+  EXPECT_TRUE(verify_result.cert_status & CERT_STATUS_COMMON_NAME_INVALID);
+
+  // Privately trusted: Falls back to common name if flags allow.
+  result = CertVerifyResult();
+  verify_result = CertVerifyResult();
+  error = 0;
+  result.is_issued_by_known_root = false;
+  verify_proc = new MockCertVerifyProc(result);
+  error = verify_proc->Verify(
+      cert.get(), "prerelna1.pre.salesforce.com", std::string(),
+      CertVerifier::VERIFY_ENABLE_COMMON_NAME_FALLBACK_LOCAL_ANCHORS, nullptr,
+      CertificateList(), &verify_result);
+  EXPECT_THAT(error, IsOk());
+  EXPECT_FALSE(verify_result.cert_status & CERT_STATUS_COMMON_NAME_INVALID);
+}
+
 // Tests that CertVerifyProc records a histogram correctly when a
 // certificate chaining to a private root contains the TLS feature
 // extension and does not have a stapled OCSP response.
 TEST(CertVerifyProcTest, HasTLSFeatureExtensionUMA) {
   base::HistogramTester histograms;
   scoped_refptr<X509Certificate> cert(
       ImportCertFromFile(GetTestCertsDirectory(), "tls_feature_extension.pem"));
   ASSERT_TRUE(cert);
   CertVerifyResult result;
   result.is_issued_by_known_root = false;
@@ skipping 82 matching lines @@
   int flags = 0;
   CertVerifyResult verify_result;
   int error = verify_proc->Verify(cert.get(), "127.0.0.1", std::string(), flags,
                                   NULL, CertificateList(), &verify_result);
   EXPECT_EQ(OK, error);
   histograms.ExpectTotalCount(kTLSFeatureExtensionHistogram, 0);
   histograms.ExpectTotalCount(kTLSFeatureExtensionOCSPHistogram, 0);
 }
 
 }  // namespace net