From 69fbcdf14c00fc882477b18af962a932db0d54ee Mon Sep 17 00:00:00 2001
From: teravus
Date: Tue, 5 Mar 2013 00:04:09 -0500
Subject: * Add a Max Payload size property to the Websocket Server Handler.   
 If you would like to restrict the maximum packet size, (and therefore protect
 against Memory DOSing) then you should set this.   I defaulted it to 40MB.   
 This means that in theory, a malicious user could connect and send a packet
 that claims that the payload is up to 40 mb (even if it doesn't actually turn
 out to be 40mb.   More testing needs to be done on it where the packets are
 maliciously malformed.

---
 .../Servers/HttpServer/WebsocketServerHandler.cs        | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

(limited to 'OpenSim/Framework/Servers')

diff --git a/OpenSim/Framework/Servers/HttpServer/WebsocketServerHandler.cs b/OpenSim/Framework/Servers/HttpServer/WebsocketServerHandler.cs
index bb8825b..ee96b47 100644
--- a/OpenSim/Framework/Servers/HttpServer/WebsocketServerHandler.cs
+++ b/OpenSim/Framework/Servers/HttpServer/WebsocketServerHandler.cs
@@ -108,6 +108,7 @@ namespace OpenSim.Framework.Servers.HttpServer
         private int _bufferLength;
         private bool _closing;
         private bool _upgraded;
+        private int _maxPayloadBytes = 41943040;
 
         private const string HandshakeAcceptText =
             "HTTP/1.1 101 Switching Protocols\r\n" +
@@ -196,6 +197,15 @@ namespace OpenSim.Framework.Servers.HttpServer
         }
 
         /// <summary>
+        /// Max Payload Size in bytes.  Defaults to 40MB, but could be set upon connection before calling handshake and upgrade.
+        /// </summary>
+        public int MaxPayloadSize
+        {
+            get { return _maxPayloadBytes; }
+            set { _maxPayloadBytes = value; }
+        }
+
+        /// <summary>
         /// This triggers the websocket start the upgrade process
         /// </summary>
         public void HandshakeAndUpgrade()
@@ -367,7 +377,12 @@ namespace OpenSim.Framework.Servers.HttpServer
                         if (headerread)
                         {
                             _socketState.FrameComplete = false;
-
+                            if (pheader.PayloadLen > (ulong) _maxPayloadBytes)
+                            {
+                                Close("Invalid Payload size");
+                                
+                                return;
+                            }
                             if (pheader.PayloadLen > 0)
                             {
                                 if ((int) pheader.PayloadLen > _bufferPosition - offset)
-- 
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