net: allow False Start only for >= TLS 1.2 && AEAD && forward-secure && ALPN/NPN.

net/socket/ssl_client_socket_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.
 
 // This file includes code SSLClientSocketNSS::DoVerifyCertComplete() derived
 // from AuthCertificateCallback() in
 // mozilla/security/manager/ssl/src/nsNSSCallbacks.cpp.
 
 /* ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
@@ skipping 89 matching lines @@
 #include "net/cert/scoped_nss_types.h"
 #include "net/cert/sct_status_flags.h"
 #include "net/cert/single_request_cert_verifier.h"
 #include "net/cert/x509_certificate_net_log_param.h"
 #include "net/cert/x509_util.h"
 #include "net/http/transport_security_state.h"
 #include "net/ocsp/nss_ocsp.h"
 #include "net/socket/client_socket_handle.h"
 #include "net/socket/nss_ssl_util.h"
 #include "net/ssl/ssl_cert_request_info.h"
+#include "net/ssl/ssl_cipher_suite_names.h"
 #include "net/ssl/ssl_connection_status_flags.h"
 #include "net/ssl/ssl_info.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <wincrypt.h>
 
 #include "base/win/windows_version.h"
 #elif defined(OS_MACOSX)
 #include <Security/SecBase.h>
@@ skipping 1474 matching lines @@
   if (rv != SECSuccess || !negotiated_extension) {
     rv = SSL_HandshakeNegotiatedExtension(socket,
                                           ssl_next_proto_nego_xtn,
                                           &negotiated_extension);
   }
   if (rv != SECSuccess || !negotiated_extension) {
     *can_false_start = PR_FALSE;
     return SECSuccess;
   }
 
+  SSLChannelInfo channel_info;
+  SECStatus ok = SSL_GetChannelInfo(socket,
+                                    &channel_info, sizeof(channel_info));
+  if (ok != SECSuccess ||
+      channel_info.length != sizeof(channel_info) ||
+      channel_info.protocolVersion < SSL_LIBRARY_VERSION_TLS_1_2 ||
+      !IsSecureTLSCipherSuite(channel_info.cipherSuite)) {
+    *can_false_start = PR_FALSE;
+    return SECSuccess;
+  }
+
   return SSL_RecommendedCanFalseStart(socket, can_false_start);
 }
 
 // static
 void SSLClientSocketNSS::Core::HandshakeCallback(
     PRFileDesc* socket,
     void* arg) {
   Core* core = reinterpret_cast<Core*>(arg);
   DCHECK(core->OnNSSTaskRunner());
 
@@ skipping 1993 matching lines @@
 scoped_refptr<X509Certificate>
 SSLClientSocketNSS::GetUnverifiedServerCertificateChain() const {
   return core_->state().server_cert.get();
 }
 
 ChannelIDService* SSLClientSocketNSS::GetChannelIDService() const {
   return channel_id_service_;
 }
 
 }  // namespace net