/// <summary>
/// Redirects to the specified URL.
/// </summary>
/// <param name="response">The response to use for redirection.</param>
/// <param name="url">The URL to redirect to.</param>
/// <param name="bypassSecurityWarning">If set to <c>true</c> security warnings will be bypassed.</param>
public void Redirect(HttpResponseBase response, string url, bool bypassSecurityWarning)
{
if (bypassSecurityWarning) {
Logger.Log("Bypassing security warning via a response header and JavaScript.");
url = JsEncodeUrl(url);
// Clear the current response buffer.
response.Clear();
// Add a refresh header to the response for the new path.
response.AddHeader("Refresh", "0;URL=" + url);
// Also, add JavaScript to replace the current location as backup.
response.Write("<html><head><title></title>");
response.Write("<script language=\"javascript\">window.location = '");
response.Write(url);
response.Write("';</script>");
response.Write("</head><body></body></html>");
} else {
Logger.Log("Issuing permanent redirect.");
// Permanent redirect.
// TODO: Make the status code configurable (i.e. permanent vs. temporary).
response.StatusCode = 301;
response.RedirectLocation = url;
}
// End the current response.
response.End();
}
public void Enrich(HttpResponseBase response, HttpRequestBase request, ISecurityEvaluator securityEvaluator, Settings settings)
{
if (!securityEvaluator.IsSecureConnection(request, settings) || !settings.EnableHsts) {
return;
}
// Add the needed STS header.
response.AddHeader("Strict-Transport-Security", string.Format("max-age={0:f0}", settings.HstsMaxAge));
}
/// <summary>
/// Gets any URI for the specified request that ensures it is being accessed by the proper protocol, if a match is found in the settings.
/// </summary>
/// <param name="request">The request to ensure proper access for.</param>
/// <param name="response">The response to use if a redirection or other output is necessary.</param>
/// <param name="security">The security setting to match.</param>
/// <param name="settings">The settings used for any redirection.</param>
/// <returns>A URL that ensures the requested resources matches the specified security; or null if the current request already does.</returns>
public string GetUriForMatchedSecurityRequest(HttpRequestBase request, HttpResponseBase response, RequestSecurity security, Settings settings)
{
string targetUrl = null;
// Evaluate the request's security.
Logger.Log("Determining if the connection is secure.");
bool isSecureConnection = _securityEvaluator.IsSecureConnection(request, settings);
if (security == RequestSecurity.Secure && !isSecureConnection ||
security == RequestSecurity.Insecure && isSecureConnection) {
Logger.Log("Calculating the target URI to switch to.");
// Determine the target protocol and get any base target URL from the settings.
string targetProtocolScheme;
string baseTargetUrl;
if (security == RequestSecurity.Secure) {
targetProtocolScheme = Uri.UriSchemeHttps;
baseTargetUrl = settings.BaseSecureUri;
} else {
targetProtocolScheme = Uri.UriSchemeHttp;
baseTargetUrl = settings.BaseInsecureUri;
}
if (string.IsNullOrEmpty(baseTargetUrl)) {
// If there is no base target URI, just switch the protocol scheme of the current request's URI.
// * Account for cookie-less sessions by applying the application modifier.
targetUrl = targetProtocolScheme + Uri.SchemeDelimiter + request.Url.Authority + response.ApplyAppPathModifier(request.RawUrl);
} else {
// Build the appropriate URI based on the specified target URL.
var uri = new StringBuilder(baseTargetUrl);
// - Use the full request path, but remove any sub-application path.
uri.Append(request.RawUrl);
if (request.ApplicationPath.Length > 1) {
uri.Remove(baseTargetUrl.Length, request.ApplicationPath.Length);
}
// Normalize the URI.
uri.Replace("//", "/", baseTargetUrl.Length - 1, uri.Length - baseTargetUrl.Length);
targetUrl = uri.ToString();
}
}
return targetUrl;
}