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* Added a Basic DOS protection container/base object for the most common HTTP Server handlers. XMLRPC Handler, GenericHttpHandler and <Various>StreamHandler
* Applied the XmlRpcBasicDOSProtector.cs to the login service as both an example, and good practice. * Applied the BaseStreamHandlerBasicDOSProtector.cs to the friends service as an example of the DOS Protector on StreamHandlers * Added CircularBuffer, used for CPU and Memory friendly rate monitoring. * DosProtector has 2 states, 1. Just Check for blocked users and check general velocity, 2. Track velocity per user, It only jumps to 2 if it's getting a lot of requests, and state 1 is about as resource friendly as if it wasn't even there.
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teravus
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/*
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* Copyright (c) Contributors, http://opensimulator.org/
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* See CONTRIBUTORS.TXT for a full list of copyright holders.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the OpenSimulator Project nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using OpenSim.Framework;
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using System.Collections.Generic;
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using System.IO;
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using System.Reflection;
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using log4net;
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namespace OpenSim.Framework.Servers.HttpServer
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{
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/// <summary>
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/// BaseStreamHandlerBasicDOSProtector Base streamed request handler.
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/// </summary>
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/// <remarks>
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/// Inheriting classes should override ProcessRequest() rather than Handle()
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/// </remarks>
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public abstract class BaseStreamHandlerBasicDOSProtector : BaseRequestHandler, IStreamedRequestHandler
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{
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private readonly CircularBuffer<int> _generalRequestTimes;
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private readonly BasicDosProtectorOptions _options;
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private readonly Dictionary<string, CircularBuffer<int>> _deeperInspection;
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private readonly Dictionary<string, int> _tempBlocked;
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private readonly System.Timers.Timer _forgetTimer;
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private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
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private readonly System.Threading.ReaderWriterLockSlim _lockSlim = new System.Threading.ReaderWriterLockSlim();
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protected BaseStreamHandlerBasicDOSProtector(string httpMethod, string path, BasicDosProtectorOptions options) : this(httpMethod, path, null, null, options) {}
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protected BaseStreamHandlerBasicDOSProtector(string httpMethod, string path, string name, string description, BasicDosProtectorOptions options)
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: base(httpMethod, path, name, description)
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{
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_generalRequestTimes = new CircularBuffer<int>(options.MaxRequestsInTimeframe + 1, true);
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_generalRequestTimes.Put(0);
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_options = options;
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_deeperInspection = new Dictionary<string, CircularBuffer<int>>();
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_tempBlocked = new Dictionary<string, int>();
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_forgetTimer = new System.Timers.Timer();
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_forgetTimer.Elapsed += delegate
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{
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_forgetTimer.Enabled = false;
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List<string> removes = new List<string>();
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_lockSlim.EnterReadLock();
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foreach (string str in _tempBlocked.Keys)
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{
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if (
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Util.EnvironmentTickCountSubtract(Util.EnvironmentTickCount(),
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_tempBlocked[str]) > 0)
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removes.Add(str);
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}
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_lockSlim.ExitReadLock();
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lock (_deeperInspection)
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{
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_lockSlim.EnterWriteLock();
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for (int i = 0; i < removes.Count; i++)
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{
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_tempBlocked.Remove(removes[i]);
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_deeperInspection.Remove(removes[i]);
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}
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_lockSlim.ExitWriteLock();
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}
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foreach (string str in removes)
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{
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m_log.InfoFormat("[{0}] client: {1} is no longer blocked.",
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_options.ReportingName, str);
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}
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_lockSlim.EnterReadLock();
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if (_tempBlocked.Count > 0)
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_forgetTimer.Enabled = true;
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_lockSlim.ExitReadLock();
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};
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_forgetTimer.Interval = _options.ForgetTimeSpan.TotalMilliseconds;
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}
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public virtual byte[] Handle(
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string path, Stream request, IOSHttpRequest httpRequest, IOSHttpResponse httpResponse)
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{
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byte[] result;
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RequestsReceived++;
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//httpRequest.Headers
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if (_options.MaxRequestsInTimeframe < 1 || _options.RequestTimeSpan.TotalMilliseconds < 1)
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{
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result = ProcessRequest(path, request, httpRequest, httpResponse);
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RequestsHandled++;
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return result;
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}
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string clientstring = GetClientString(httpRequest);
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_lockSlim.EnterReadLock();
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if (_tempBlocked.ContainsKey(clientstring))
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{
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_lockSlim.ExitReadLock();
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if (_options.ThrottledAction == ThrottleAction.DoThrottledMethod)
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{
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result = ThrottledRequest(path, request, httpRequest, httpResponse);
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RequestsHandled++;
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return result;
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}
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else
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throw new System.Security.SecurityException("Throttled");
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}
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_lockSlim.ExitReadLock();
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_generalRequestTimes.Put(Util.EnvironmentTickCount());
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if (_generalRequestTimes.Size == _generalRequestTimes.Capacity &&
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(Util.EnvironmentTickCountSubtract(Util.EnvironmentTickCount(), _generalRequestTimes.Get()) <
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_options.RequestTimeSpan.TotalMilliseconds))
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{
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//Trigger deeper inspection
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if (DeeperInspection(httpRequest))
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{
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result = ProcessRequest(path, request, httpRequest, httpResponse);
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RequestsHandled++;
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return result;
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}
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if (_options.ThrottledAction == ThrottleAction.DoThrottledMethod)
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{
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result = ThrottledRequest(path, request, httpRequest, httpResponse);
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RequestsHandled++;
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return result;
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}
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else
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throw new System.Security.SecurityException("Throttled");
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}
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result =ProcessRequest(path, request, httpRequest, httpResponse);
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RequestsHandled++;
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return result;
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}
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protected virtual byte[] ProcessRequest(
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string path, Stream request, IOSHttpRequest httpRequest, IOSHttpResponse httpResponse)
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{
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return null;
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}
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protected virtual byte[] ThrottledRequest(
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string path, Stream request, IOSHttpRequest httpRequest, IOSHttpResponse httpResponse)
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{
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return new byte[0];
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}
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private bool DeeperInspection(IOSHttpRequest httpRequest)
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{
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lock (_deeperInspection)
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{
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string clientstring = GetClientString(httpRequest);
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if (_deeperInspection.ContainsKey(clientstring))
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{
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_deeperInspection[clientstring].Put(Util.EnvironmentTickCount());
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if (_deeperInspection[clientstring].Size == _deeperInspection[clientstring].Capacity &&
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(Util.EnvironmentTickCountSubtract(Util.EnvironmentTickCount(), _deeperInspection[clientstring].Get()) <
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_options.RequestTimeSpan.TotalMilliseconds))
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{
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_lockSlim.EnterWriteLock();
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if (!_tempBlocked.ContainsKey(clientstring))
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_tempBlocked.Add(clientstring, Util.EnvironmentTickCount() + (int)_options.ForgetTimeSpan.TotalMilliseconds);
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else
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_tempBlocked[clientstring] = Util.EnvironmentTickCount() + (int)_options.ForgetTimeSpan.TotalMilliseconds;
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_lockSlim.ExitWriteLock();
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m_log.WarnFormat("[{0}]: client: {1} is blocked for {2} milliseconds, X-ForwardedForAllowed status is {3}, endpoint:{4}", _options.ReportingName, clientstring, _options.ForgetTimeSpan.TotalMilliseconds, _options.AllowXForwardedFor, GetRemoteAddr(httpRequest));
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return false;
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}
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//else
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// return true;
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}
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else
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{
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_deeperInspection.Add(clientstring, new CircularBuffer<int>(_options.MaxRequestsInTimeframe + 1, true));
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_deeperInspection[clientstring].Put(Util.EnvironmentTickCount());
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_forgetTimer.Enabled = true;
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}
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}
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return true;
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}
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private string GetRemoteAddr(IOSHttpRequest httpRequest)
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{
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string remoteaddr = string.Empty;
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if (httpRequest.Headers["remote_addr"] != null)
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remoteaddr = httpRequest.Headers["remote_addr"];
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return remoteaddr;
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}
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private string GetClientString(IOSHttpRequest httpRequest)
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{
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string clientstring = string.Empty;
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if (_options.AllowXForwardedFor && httpRequest.Headers["x-forwarded-for"] != null)
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clientstring = httpRequest.Headers["x-forwarded-for"];
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else
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clientstring = GetRemoteAddr(httpRequest);
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return clientstring;
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}
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}
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}
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