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POBlocking dangerous IPs for accessing a resource
 

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    <p></p> <h1>Environment</h1> <p>My IIS host an WebApp with WebService resources.</p> <ul> <li>...</li> <li>myWebService.asmx</li> <li>myWebService.svc</li> <li>...</li> </ul> <h1>Problem</h1> <p>Same bad guys, try to block server accessing the public resources with theirs bots.</p> <h1>Applied solution</h1> <ol> <li><p>I Build a filter: </p> <pre class="lang-cs prettyprint-override"><code>public class BadGuysFilter { private class BadGuy { public BadGuy() { Visits = 0; FirstSuspiciousVisit = DateTime.Now; } public int Visits; public DateTime FirstSuspiciousVisit; } private static volatile Dictionary&lt;string, BadGuy&gt; _blackList = new Dictionary&lt;string, BadGuy&gt;(); private static int _visitsLimit = 10; private static int _minutsLimit = 10; private static int _removeFromBlackListMinutesLimit = 30; public static void Init(int visitsLimit = 10, int minutsLimit = 10, int removeFromBlackListMinutesLimit = 30) { _visitsLimit = visitsLimit; _minutsLimit = minutsLimit; _removeFromBlackListMinutesLimit = removeFromBlackListMinutesLimit; } public static bool IsBadGuy() { return IsBadGuy(HttpContext.Current.Request.UserHostAddress); } public static bool IsBadGuy(string ip) { if (HttpContext.Current.Request.IsAuthenticated /*|| HttpContext.Current.Request.HttpMethod.ToUpper() == "POST"*/) return false; if (_blackList.Keys.Any(k =&gt; k == ip)) { _blackList[ip].Visits++; if (_blackList[ip].FirstSuspiciousVisit &lt; DateTime.Now.AddMinutes(-_removeFromBlackListMinutesLimit)) _blackList.Remove(ip); else if (_blackList[ip].FirstSuspiciousVisit &lt; DateTime.Now.AddMinutes(-_minutsLimit)) { _blackList[ip].Visits = 0; _blackList[ip].FirstSuspiciousVisit = DateTime.Now; } else if (_blackList[ip].Visits &gt; _visitsLimit) { _blackList[ip].FirstSuspiciousVisit = DateTime.Now; return true; } } else _blackList.Add(ip, new BadGuy()); return false; } public static void Punish() { var res = HttpContext.Current.Response; res.Clear(); res.StatusCode = 429; res.StatusDescription = "TOO MANY REQUESTS: Your application is sending too many simultaneous requests."; res.End(); } } </code></pre></li> <li><p>Use filter in <strong>Global.asax</strong> </p> <pre class="lang-cs prettyprint-override"><code>void Application_BeginRequest(object sender, EventArgs e) { if(BadGuysFilter.IsBadGuy()) BadGuysFilter.Punish(); // do stuff // } void Application_EndRequest(object sender, EventArgs e) { var app = (HttpApplication)sender; if (app.Context.Response.StatusCode == 429) // "TOO MANY REQUESTS" return; // do stuff // } </code></pre></li> </ol> <h1>Question</h1> <p><strong>Is this an enough safe solution? Or maybe there is another way?</strong></p> <p>Edite: <em>"don't block at the resource itself. block farther upstream, e.g. at the firewall. – Marc B" Yes, you're right. This is final solution, but before apply it i need intermediate solution to defend my server. I forgot to mention this thing. – Artiom</em></p>
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    1. COdon't block at the resource itself. block farther upstream, e.g. at the firewall.
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    2. COas @MarcB says, this solution is going to tie up IIS resources for every blocked request, which is not going to help if they're doing DDOS attack.
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    3. COYes, you're right. This is final solution, but before apply it i need intermediate solution to defend my server. I forgot to mention this thing.
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