net: limit HSTS ages to one year.

net/base/transport_security_state.h

 // Copyright (c) 2010 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.
 
 #ifndef NET_BASE_TRANSPORT_SECURITY_STATE_H_
 #define NET_BASE_TRANSPORT_SECURITY_STATE_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 70 matching lines @@
 
    protected:
     virtual ~Delegate() {}
   };
 
   void SetDelegate(Delegate*);
 
   bool Serialise(std::string* output);
   bool Deserialise(const std::string& state, bool* dirty);
 
+  // The maximum number of seconds for which we'll cache an HSTS request.
+  static const long int kMaxHSTSAgeSecs;
+
  private:
   friend class base::RefCountedThreadSafe<TransportSecurityState>;
   FRIEND_TEST_ALL_PREFIXES(TransportSecurityStateTest, IsPreloaded);
 
   ~TransportSecurityState();
 
   // If we have a callback configured, call it to let our serialiser know that
   // our state is dirty.
   void DirtyNotify();
 
   // The set of hosts that have enabled TransportSecurity. The keys here
   // are SHA256(DNSForm(domain)) where DNSForm converts from dotted form
   // ('www.google.com') to the form used in DNS: "\x03www\x06google\x03com"
   std::map<std::string, DomainState> enabled_hosts_;
 
   // Our delegate who gets notified when we are dirtied, or NULL.
   Delegate* delegate_;
 
   static std::string CanonicaliseHost(const std::string& host);
   static bool IsPreloadedSTS(const std::string& canonicalised_host,
                              bool* out_include_subdomains);
 
   DISALLOW_COPY_AND_ASSIGN(TransportSecurityState);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_TRANSPORT_SECURITY_STATE_H_