Do not use HTTP/2 without adequate security.

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 954 matching lines @@
                                     memio_Private* buffers) {
   DCHECK(OnNetworkTaskRunner());
   DCHECK(!nss_fd_);
   DCHECK(!nss_bufs_);
 
   nss_fd_ = socket;
   nss_bufs_ = buffers;
 
   SECStatus rv = SECSuccess;
 
+#if !defined(CKM_AES_GCM)
+#define CKM_AES_GCM 0x00001087
+#endif
+
   if (!ssl_config_.next_protos.empty()) {
-    std::vector<uint8_t> wire_protos =
-        SerializeNextProtos(ssl_config_.next_protos);
+    // On platforms using NSS, AES-GCM is the only mechanism that satisfies the
+    // security requirements of HTTP/2.
+    // TODO(bnc): Check if ssl_config_.disabled_cipher_suites contains all
+    // AES-GCM ciphersuites.
+    std::vector<uint8_t> wire_protos = SerializeNextProtos(
+        ssl_config_.next_protos, PK11_TokenExists(CKM_AES_GCM) &&
+                                     IsTLSVersionAdequateForHTTP2(ssl_config_));
     rv = SSL_SetNextProtoNego(
         nss_fd_, wire_protos.empty() ? NULL : &wire_protos[0],
         wire_protos.size());
     if (rv != SECSuccess)
       LogFailedNSSFunction(*weak_net_log_, "SSL_SetNextProtoNego", "");
     rv = SSL_OptionSet(nss_fd_, SSL_ENABLE_ALPN, PR_TRUE);
     if (rv != SECSuccess)
       LogFailedNSSFunction(*weak_net_log_, "SSL_OptionSet", "SSL_ENABLE_ALPN");
     rv = SSL_OptionSet(nss_fd_, SSL_ENABLE_NPN, PR_TRUE);
     if (rv != SECSuccess)
@@ skipping 2630 matching lines @@
 scoped_refptr<X509Certificate>
 SSLClientSocketNSS::GetUnverifiedServerCertificateChain() const {
   return core_->state().server_cert.get();
 }
 
 ChannelIDService* SSLClientSocketNSS::GetChannelIDService() const {
   return channel_id_service_;
 }
 
 }  // namespace net