ASP.NET中的IP地址和域限制

Question

我希望我的web应用程序只能从确切的IP范围访问。

如果客户端IP不在范围内，则保存在WEB中。配置应用程序必须拒绝我访问页面

Answer 1

Azure Web Apps(以前的Azure网站)已经支持此功能一段时间了。它是IIS和Azure Web应用程序的一个功能，通过在Web .config中添加ipSecurity元素可以使用它。您不需要编写任何代码来执行此操作。

这是描述Azure Web应用程序特性的博客，以及如何将配置添加到Web .config的示例。

http://azure.microsoft.com/blog/2013/12/09/ip-and-domain-restrictions-for-windows-azure-web-sites/

Answer 2

那么我们如何将这些IP范围添加到Web.config

<?xml version="1.0"?>
<configuration>
  <appSettings>
    <add key="IP" value="31.171.126.0/255,31.171.127.0/255"/>
  </appSettings>
  <system.web>
    <customErrors mode="Off"/>
    <compilation debug="true"/>
    <authentication mode="None"/>
  </system.web>
</configuration>

后台代码如何工作:

protected void Page_Load(object sender, EventArgs e)
{
    var allowed = false;
    //Get IP ranges from Web.config
    // AS you see in web.config different IP ranges is seperated by comma
    var ip = ConfigurationManager.AppSettings["IP"];
    // Get Client Ip
    lblIp.Text = GetIpAddress().Split(':')[0];

    var clientIp = GetIpAddress();
    var list = ip.Split(',');

    //Do search inside IP ranges and see if client IP is inside IP ranges which is allowed to open web app. 
    foreach (var item in list)
    {
        var range = Convert.ToInt32(item.Split('/')[1].ToString(CultureInfo.InvariantCulture));
        for (var i=0; i <= range; i++)
        {
            var submaskip = item.Split('/')[0].Split('.')[0] + "." + item.Split('/')[0].Split('.')[1] + "." +
                            item.Split('/')[0].Split('.')[2] + "." + i;
            if (clientIp == submaskip)
            {
                allowed = true;
            }
        }
    }
    if (allowed == false)
    {
        Response.Redirect("Denied.aspx");
    }
}

// Get Client IP
protected string GetIpAddress()
{
    var context = System.Web.HttpContext.Current;
    var ipAddress = context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
    if (string.IsNullOrEmpty(ipAddress)) return context.Request.ServerVariables["REMOTE_ADDR"];
    var addresses = ipAddress.Split(',');
    return addresses.Length != 0 ? addresses[0] : context.Request.ServerVariables["REMOTE_ADDR"];
}