Shielding proxy servers in website security attacks and defense

Shielding proxy servers in website security attacks and defense
Shielding proxy servers in website security attacks and defense

 

Website security has always been an important topic. I have written code for shielding proxy servers against network attacks:

1. Write a webpage request class:

using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Net;using System.Text;using System.Threading;using System.Threading.Tasks;namespace ConsoleApplication1{    public class WebRequestUtil    {        public static string responseBody = string.Empty;         public static bool GetWeb(string uri, string proxyAddress = "", int proxyPort = 0)        {            string serverUri = string.Format(uri);            ////set limit for supporting 200 connection            ServicePointManager.DefaultConnectionLimit = 1000;            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(serverUri);            if (!string.IsNullOrEmpty(proxyAddress))            {                WebProxy myproxy = new WebProxy(proxyAddress, proxyPort);                request.Proxy = myproxy;            }            ////extend timeout for decrease request timeout re-trying times            request.Timeout = 60 * 1000;            request.Method = @"GET";            UTF8Encoding encoding = new UTF8Encoding();            request.Headers.Set("Cache-Control", @"no-cache");            request.UserAgent = "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)";            try            {                HttpWebResponse response = (HttpWebResponse)request.GetResponse();                bool isSent = false;                int retryCount = 0;                string errorStr = string.Empty;                while (!isSent && retryCount <= 2)                {                    retryCount++;                    try                    {                        using (StreamReader stream = new StreamReader(response.GetResponseStream(), Encoding.UTF8))                        {                            responseBody = stream.ReadToEnd();                        }                        isSent = true;                    }                    catch (Exception exc)                    {                        if (!errorStr.Contains(exc.ToString()))                        {                            errorStr += exc.ToString();                        }                        ////Re-try when operation timeout                        if (!exc.ToString().Contains("The operation has timed out"))                        {                            LogError(exc.ToString());                        }                        Thread.Sleep(1000);                    }                }                if (retryCount > 100)                {                    string err = string.Format("request.GetRequestStream try 100 times and timeout! detail error: {0}", errorStr);                    LogError(err);                    return false;                }                ////need to close or abort request for each call to fix timeout issue, otherwise it will fail when the 3rd call!                if (request != null)                {                    request.Abort();                }                if (response.StatusCode != HttpStatusCode.OK)                {                    string err = string.Format("Failed, error:{1}", response.ToString());                    LogError(err);                    return false;                }                if (response != null)                {                    response.Close();                }            }            catch (Exception exc)            {                LogError(exc.ToString());                return false;            }            return true;        }        public static void LogError(string content)        {            File.AppendAllText("log.log", "ERROR: " + content + Environment.NewLine);        }    }}

2. Collection proxy server code:

using System;using System.Collections.Generic;using System.Linq;using System.Net;using System.Reflection;using System.Text;using System.Threading.Tasks;using Microsoft.ServiceBus;using Microsoft.ServiceBus.Messaging;using System.Threading;using System.IO;using System.Text.RegularExpressions;namespace ConsoleApplication1{    class Program    {        static int FailCount = 0;        static int TotalCount = 0;        const string IPRegex = @"(\d{1,3}\.){3}\d{1,3}</td><td>\d{1,4}";        static void Main()        {            DateTime startTime = DateTime.Now;            //int i = 0;            //while (DateTime.Now < startTime.AddMinutes(5))            {                //WriteLog("Try " + i++ + "th round! Begin" + DateTime.Now.ToString());                //WebRequestUtil.GetWeb(@"http://edu.laliyun.com/test.php", "147.47.106.36", 1920);                //File.AppendAllText(@"test.txt", WebRequestUtil.responseBody, Encoding.UTF8);                string url = @"http://proxy.com.ru/gaoni/list_{0}.html";                for (int i = 1; i <= 63; i++)                {                    WebRequestUtil.GetWeb(string.Format(url, i));                    string sourceString = WebRequestUtil.responseBody;                    string IPs = string.Empty;                    var matches = Regex.Matches(sourceString, IPRegex);                    if (matches.Count > 0)                    {                        foreach (var m in matches)                        {                            string ip = m.ToString().Replace("</td><td>", "#").Split('#')[0];                            IPs += ip + Environment.NewLine;                        }                    }                    File.AppendAllText(@"blacklist.txt", IPs, Encoding.UTF8);                    Console.WriteLine("Done " + i.ToString() + " page.");                }                //Test2(1);                //WriteLog("Total:" + TotalCount);                //WriteLog("Fail:" + FailCount);                //WriteLog("Try " + i++ + "th round! End" + DateTime.Now.ToString());            }            Console.WriteLine("Please press any key to end of this program!\r\n");            Console.ReadKey();        }        static void WriteTotalLog(string message)        {            //WriteLog(message, @"C:\TotalLog.txt");        }        static void WriteLog(string message, string path = @"C:\Test\Test#log.txt")        {            message = "ThreadId:" + Thread.CurrentThread.ManagedThreadId + "," + message + Environment.NewLine;            File.AppendAllText(path.Replace("#", Thread.CurrentThread.ManagedThreadId.ToString()), message);        }        static void WriteErrorLog(string message)        {            WriteLog(message, @"C:\TestError" + Thread.CurrentThread.ManagedThreadId + "log.txt");        }

3. multi-thread attack server code:

static void Test2(int numThreads)        {            ManualResetEvent resetEvent = new ManualResetEvent(false);            int toProcess = numThreads;            // Start workers.            for (int i = 0; i < numThreads; i++)            {                new Thread(delegate()                {                    test();                    //Console.WriteLine(Thread.CurrentThread.ManagedThreadId);                    // If we're the last thread, signal                    if (Interlocked.Decrement(ref toProcess) == 0)                        resetEvent.Set();                }).Start();            }            // Wait for workers.            resetEvent.WaitOne();            WriteTotalLog("Done all!");        }        static void test()        {            TotalCount++;            try            {                WebRequestUtil.GetWeb(@"http://1111.ip138.com/ic.asp", "219.239.236.49", 8888);                File.AppendAllText(@"response.html", WebRequestUtil.responseBody, Encoding.UTF8);                Console.WriteLine(Thread.CurrentThread.ManagedThreadId + "pass");            }            catch (Exception exc2)            {                FailCount++;                WriteErrorLog("Error:" + exc2.ToString());            }        }    }}

4. Php web page shielding proxy server code:

<? Php $ page = file_get_contents ("blacklist.txt"); if (! Empty ($ _ SERVER ['HTTP _ CLIENT_IP ']) {// check ip from share internet $ ip =$ _ SERVER ['HTTP _ CLIENT_IP'];} else if (! Empty ($ _ SERVER ['HTTP _ X_FORWARDED_FOR ']) {// to check ip is pass from proxy $ ip =$ _ SERVER ['HTTP _ X_FORWARDED_FOR'];} else {$ ip = $ _ SERVER ['remote _ ADDR '];} echo $ ip; if (strpos ($ page, $ ip )! = False) echo "you are using a proxy to browse our website. Sorry, this site blocked the proxy for security reasons. Please use a non-proxy to browse. Thank you! "; Elseecho" normal logic of execution program ";?>

DEMO code: http://edu.laliyun.com/test.php