Add a histogram for measuring the number of times we fall back to common name matching, when a cert…

net/cert/cert_verify_proc_nss.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_nss.h"
 
 #include <string>
 #include <vector>
 
 #include <cert.h>
@@ skipping 745 matching lines @@
     CertVerifyResult* verify_result) {
 #if defined(OS_IOS)
   // For iOS, the entire chain must be loaded into NSS's in-memory certificate
   // store.
   x509_util_ios::NSSCertChain scoped_chain(cert);
   CERTCertificate* cert_handle = scoped_chain.cert_handle();
 #else
   CERTCertificate* cert_handle = cert->os_cert_handle();
 #endif  // defined(OS_IOS)
 
-  // Make sure that the hostname matches with the common name of the cert.
-  if (!cert->VerifyNameMatch(hostname))
+  if (!cert->VerifyNameMatch(hostname,
+                             &verify_result->common_name_fallback_used)) {
     verify_result->cert_status |= CERT_STATUS_COMMON_NAME_INVALID;
+  }
 
   // Make sure that the cert is valid now.
   SECCertTimeValidity validity = CERT_CheckCertValidTimes(
       cert_handle, PR_Now(), PR_TRUE);
   if (validity != secCertTimeValid)
     verify_result->cert_status |= CERT_STATUS_DATE_INVALID;
 
   CERTValOutParam cvout[3];
   int cvout_index = 0;
   cvout[cvout_index].type = cert_po_certList;
@@ skipping 103 matching lines @@
     if (VerifyEV(cert_handle, flags, crl_set, check_revocation, metadata,
                  ev_policy_oid, trust_anchors.get())) {
       verify_result->cert_status |= CERT_STATUS_IS_EV;
     }
   }
 
   return OK;
 }
 
 }  // namespace net