网站安全攻击和防御中的屏蔽代理服务器
网站安全一直是个重要话题，本人写了网络攻防的屏蔽代理服务器相关代码，分享下：
1. 写个网页request类：
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. 采集代理服务器代码：
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. 多线程攻击服务器代码：
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网页屏蔽代理服务器代码：
<?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 "您使用代理浏览我们的网站，很抱歉本站出于安全考虑屏蔽了代理，请使用非代理浏览，谢谢!";
else
echo "执行程序的正常逻辑";
?>