Merge 22709 - Treat certificate signatures using weak signature algorithms...

net/base/x509_certificate_win.cc

 // Copyright (c) 2006-2008 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/base/x509_certificate.h"
 
 #include "base/logging.h"
 #include "base/pickle.h"
 #include "base/string_tokenizer.h"
 #include "base/string_util.h"
@@ skipping 453 matching lines @@
            &chain_context)) {
     return MapSecurityError(GetLastError());
   }
   ScopedCertChainContext scoped_chain_context(chain_context);
 
   GetCertChainInfo(chain_context, verify_result);
 
   verify_result->cert_status |= MapCertChainErrorStatusToCertStatus(
       chain_context->TrustStatus.dwErrorStatus);
 
+  // Treat certificate signatures using weak signature algorithms as invalid.
+  if (verify_result->has_md2 || verify_result->has_md4)
+    verify_result->cert_status |= CERT_STATUS_INVALID;
+
   std::wstring wstr_hostname = ASCIIToWide(hostname);
 
   SSL_EXTRA_CERT_CHAIN_POLICY_PARA extra_policy_para;
   memset(&extra_policy_para, 0, sizeof(extra_policy_para));
   extra_policy_para.cbSize = sizeof(extra_policy_para);
   extra_policy_para.dwAuthType = AUTHTYPE_SERVER;
   extra_policy_para.fdwChecks = 0;
   extra_policy_para.pwszServerName =
       const_cast<wchar_t*>(wstr_hostname.c_str());
 
@@ skipping 159 matching lines @@
   DWORD sha1_size = sizeof(sha1.data);
   rv = CryptHashCertificate(NULL, CALG_SHA1, 0, cert->pbCertEncoded,
                             cert->cbCertEncoded, sha1.data, &sha1_size);
   DCHECK(rv && sha1_size == sizeof(sha1.data));
   if (!rv)
     memset(sha1.data, 0, sizeof(sha1.data));
   return sha1;
 }
 
 }  // namespace net