Require ECDHE cipher in remoting client.

remoting/protocol/ssl_hmac_channel_authenticator.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 "remoting/protocol/ssl_hmac_channel_authenticator.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback_helpers.h"
 #include "base/logging.h"
@@ skipping 120 matching lines @@
     cert_and_status.der_cert = remote_cert_;
 
     net::SSLConfig ssl_config;
     // Certificate verification and revocation checking are not needed
     // because we use self-signed certs. Disable it so that the SSL
     // layer doesn't try to initialize OCSP (OCSP works only on the IO
     // thread).
     ssl_config.cert_io_enabled = false;
     ssl_config.rev_checking_enabled = false;
     ssl_config.allowed_bad_certs.push_back(cert_and_status);
+    ssl_config.require_ecdhe = true;
 
     net::HostPortPair host_and_port(kSslFakeHostName, 0);
     net::SSLClientSocketContext context;
     context.transport_security_state = transport_security_state_.get();
     context.cert_verifier = cert_verifier_.get();
     scoped_ptr<net::ClientSocketHandle> socket_handle(
         new net::ClientSocketHandle);
     socket_handle->SetSocket(socket.Pass());
 
 #if defined(OS_NACL)
@@ skipping 163 matching lines @@
     base::ResetAndReturn(&done_callback_).Run(net::OK, socket_.Pass());
   }
 }
 
 void SslHmacChannelAuthenticator::NotifyError(int error) {
   base::ResetAndReturn(&done_callback_).Run(error, nullptr);
 }
 
 }  // namespace protocol
 }  // namespace remoting