public HstsMiddleware(AppFunc next, HstsOptions options)
: base(next)
{
_config = options;
var headerGenerator = new HeaderGenerator();
_headerResult = headerGenerator.CreateHstsResult(_config);
}
public void Validate(IHstsConfiguration hstsConfig)
{
if (!hstsConfig.Preload) return;
if (hstsConfig.MaxAge.TotalSeconds < 10886400 || !hstsConfig.IncludeSubdomains)
{
throw new Exception("HSTS max age must be at least 18 weeks and includesubdomains must be enabled to use the preload directive.");
}
}
public void Validate(IHstsConfiguration hstsConfig)
{
if (!hstsConfig.Preload) return;
if (hstsConfig.UpgradeInsecureRequests)
{
throw new Exception("The Preload setting cannot be combined with the UpgradeInsecureRequests setting. Use one or the other.");
}
if (hstsConfig.MaxAge.TotalSeconds < 10886400 || !hstsConfig.IncludeSubdomains)
{
throw new Exception("HSTS max age must be at least 18 weeks and includesubdomains must be enabled to use the preload directive.");
}
}
public HeaderResult CreateHstsResult(IHstsConfiguration hstsConfig)
{
if (hstsConfig.MaxAge < TimeSpan.Zero) return null;
if (hstsConfig.Preload && (hstsConfig.MaxAge.TotalSeconds < 10886400 || !hstsConfig.IncludeSubdomains))
{
return null;
}
var seconds = (int)hstsConfig.MaxAge.TotalSeconds;
var includeSubdomains = (hstsConfig.IncludeSubdomains ? "; includeSubdomains" : "");
var preload = (hstsConfig.Preload ? "; preload" : "");
var value = string.Format("max-age={0}{1}{2}", seconds, includeSubdomains, preload);
return new HeaderResult(HeaderResult.ResponseAction.Set, HeaderConstants.StrictTransportSecurityHeader,
value);
}
public HeaderResult CreateHstsResult(IHstsConfiguration hstsConfig)
{
if (hstsConfig.MaxAge < TimeSpan.Zero)
{
return(null);
}
if (hstsConfig.Preload && (hstsConfig.MaxAge.TotalSeconds < 10886400 || !hstsConfig.IncludeSubdomains))
{
return(null);
}
var seconds = (int)hstsConfig.MaxAge.TotalSeconds;
var includeSubdomains = (hstsConfig.IncludeSubdomains ? "; includeSubDomains" : "");
var preload = (hstsConfig.Preload ? "; preload" : "");
var value = $"max-age={seconds}{includeSubdomains}{preload}";
return(new HeaderResult(HeaderResult.ResponseAction.Set, HeaderConstants.StrictTransportSecurityHeader,
value));
}