Do not use HTTP/2 without adequate security.

net/socket/ssl_client_socket_openssl.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.
 
 // OpenSSL binding for SSLClientSocket. The class layout and general principle
 // of operation is derived from SSLClientSocketNSS.
 
 #include "net/socket/ssl_client_socket_openssl.h"
 
 #include <errno.h>
@@ skipping 820 matching lines @@
 
   if (ssl_config_.version_fallback)
     SSL_enable_fallback_scsv(ssl_);
 
   // TLS channel ids.
   if (IsChannelIDEnabled(ssl_config_, channel_id_service_)) {
     SSL_enable_tls_channel_id(ssl_);
   }
 
   if (!ssl_config_.next_protos.empty()) {
-    std::vector<uint8_t> wire_protos =
-        SerializeNextProtos(ssl_config_.next_protos);
+    // Get list of ciphers that are enabled.
+    STACK_OF(SSL_CIPHER)* enabled_ciphers = SSL_get_ciphers(ssl_);
+    DCHECK(enabled_ciphers);
+    std::vector<uint16> enabled_ciphers_vector;
+    for (size_t i = 0; i < sk_SSL_CIPHER_num(enabled_ciphers); ++i) {
+      const SSL_CIPHER* cipher = sk_SSL_CIPHER_value(enabled_ciphers, i);
+      const uint16 id = static_cast<uint16>(SSL_CIPHER_get_id(cipher));
+      enabled_ciphers_vector.push_back(id);
+    }
+
+    std::vector<uint8_t> wire_protos = SerializeNextProtos(
+        ssl_config_.next_protos,
+        IsSecurityAdequateForHTTP2(ssl_config_, enabled_ciphers_vector));
     SSL_set_alpn_protos(ssl_, wire_protos.empty() ? NULL : &wire_protos[0],
                         wire_protos.size());
   }
 
   if (ssl_config_.signed_cert_timestamps_enabled) {
     SSL_enable_signed_cert_timestamps(ssl_);
     SSL_enable_ocsp_stapling(ssl_);
   }
 
   if (IsOCSPStaplingSupported())
@@ skipping 1049 matching lines @@
                                             ct::SCT_STATUS_LOG_UNKNOWN));
   }
 }
 
 scoped_refptr<X509Certificate>
 SSLClientSocketOpenSSL::GetUnverifiedServerCertificateChain() const {
   return server_cert_;
 }
 
 }  // namespace net