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Question

Check for SSL when hosted in Rackspace (Mosso) Cloud

Answer 1

+4 A:

Although it is difficult to check if SSL is engaged a way around the problem is to force SSL.

From the RackspaceCloud Support knowledge base here: http://cloudsites.rackspacecloud.com/index.php/How_do_I_force_SSL_on_my_ASP/.NET_site%3F

You can re-write URLs in web.config:

<configuration>
<system.webServer>
  <rewrite>
    <rules>
      <rule name="Redirect to HTTPS" stopProcessing="true">
        <match url=".*" />
        <conditions>
          <add input="{HTTP_CLUSTER_HTTPS}" pattern="^on$" negate="true" />
          <add input="{HTTP_CLUSTER-HTTPS}" pattern=".+" negate="true" />
        </conditions>
        <action type="Redirect" url="https://{HTTP_HOST}{SCRIPT_NAME}" redirectType="SeeOther" />
      </rule>
    </rules>
  </rewrite>
</system.webServer>
</configuration>

You can force SSL in ASP.NET:

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"&gt;

<script runat="server">
  protected void Page_Load(object sender, System.EventArgs e)
  {
    if(Request.ServerVariables["HTTP_CLUSTER_HTTPS"] != "on")
    {
      if(Request.ServerVariables.Get("HTTP_CLUSTER-HTTPS") == null)
      {
        string xredir__, xqstr__;

        xredir__ = "https://" + Request.ServerVariables["SERVER_NAME"];
        xredir__ += Request.ServerVariables["SCRIPT_NAME"];
        xqstr__ = Request.ServerVariables["QUERY_STRING"];

        if (xqstr__ != "")
            xredir__ = xredir__ + "?" + xqstr__;

        Response.Redirect(xredir__);
      }
    }
    Response.Write("SSL Only");
  }
</script>

<html>
<head id="Head1" runat="server">
  <title>SSL Only</title>
</head>
<body>
</body>
</html>

Kelly Orr 2010-01-19 13:55:13

Thanks, I searched the help files and didn't find that myself. Looking back, I suppose it would have been smart to loop the ServerVariables collection and see what was there.

Charlie Brown 2010-01-19 14:30:59

I'm curious, is "HTTP_CLUSTER-HTTPS" a typo? You have one with two underscores, and one with an underscore and a dash.

Chad Gorshing 2010-02-24 16:18:29

Answer 2

A:

I ran into this same problem with Rackspace Cloud and ended up solving it by manually implementing a Request.IsSecureConnection() extension method and replacing the framework's RequireHttpsAttribute with my own. Hopefully someone else will find this useful as well.

/// <summary>
/// Replaces framework-provided RequireHttpsAttribute to disable SSL requirement for local requests 
/// and properly enforce SSL requirement when used with Rackspace Cloud's load balancer
/// </summary>
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, Inherited = true, AllowMultiple = false)]
public class RequireHttpsAttribute : FilterAttribute, IAuthorizationFilter
{
    public virtual void OnAuthorization(AuthorizationContext filterContext) {
        if (filterContext == null) {
            throw new ArgumentNullException("filterContext");
        }

        if (filterContext.HttpContext.Request.IsLocal)
            return;

        if (!filterContext.HttpContext.Request.IsSecureConnection()) {
            HandleNonHttpsRequest(filterContext);
        }
    }

    protected virtual void HandleNonHttpsRequest(AuthorizationContext filterContext) {
        // only redirect for GET requests, otherwise the browser might not propagate the verb and request
        // body correctly.

        if (!String.Equals(filterContext.HttpContext.Request.HttpMethod, "GET", StringComparison.OrdinalIgnoreCase)) {
            throw new InvalidOperationException("The requested resource can only be accessed via SSL.");
        }

        // redirect to HTTPS version of page
        string url = "https://" + filterContext.HttpContext.Request.Url.Host + filterContext.HttpContext.Request.RawUrl;
        filterContext.Result = new RedirectResult(url);
    }

}

public static class Extensions {
    /// <summary>
    /// Gets a value which indicates whether the HTTP connection uses secure sockets (HTTPS protocol). Works with Rackspace Cloud's load balancer
    /// </summary>
    /// <param name="request"></param>
    /// <returns></returns>
    public static bool IsSecureConnection(this HttpRequestBase request) {
        const string rackspaceSslVar = "HTTP_CLUSTER_HTTPS";

        return (request.IsSecureConnection || (request.ServerVariables[rackspaceSslVar] != null || request.ServerVariables[rackspaceSslVar] == "on"));
    }

    /// <summary>
    /// Gets a value which indicates whether the HTTP connection uses secure sockets (HTTPS protocol). Works with Rackspace Cloud's load balancer
    /// </summary>
    /// <param name="request"></param>
    /// <returns></returns>
    public static bool IsSecureConnection(this HttpRequest request) {
        const string rackspaceSslVar = "HTTP_CLUSTER_HTTPS";

        return (request.IsSecureConnection || (request.ServerVariables[rackspaceSslVar] != null || request.ServerVariables[rackspaceSslVar] == "on"));
    }
}

Nathan Taylor 2010-04-12 19:05:29

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Check for SSL when hosted in Rackspace (Mosso) Cloud

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