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So, the client can have an old idea of the object properties for the object when it goes to buy. This can cause a problem in the buy process. Additionally Hazim mentioned that the buy packets are spoofable. The core modules are the crowing glory example of best practice :P, so therefore, setting the example here, Validate Client sent Buy Data. WebAppSecurity 101, Never trust a client. Validate Validate Validate! Or you'll have problems whether intentional or not.

0.6.9-post-fixes
Teravus Ovares (Dan Olivares) 2010-10-02 15:42:39 -04:00
parent e619aceebc
commit 30b301482e
1 changed files with 25 additions and 0 deletions
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25
OpenSim/Region/OptionalModules/World/MoneyModule/SampleMoneyModule.cs
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@ -844,12 +844,37 @@ namespace OpenSim.Region.OptionalModules.World.MoneyModule
}
Scene s = LocateSceneClientIn(remoteClient.AgentId);
// Implmenting base sale data checking here so the default OpenSimulator implementation isn't useless
// combined with other implementations. We're actually validating that the client is sending the data
// that it should. In theory, the client should already know what to send here because it'll see it when it
// gets the object data. If the data sent by the client doesn't match the object, the viewer probably has an
// old idea of what the object properties are. Viewer developer Hazim informed us that the base module
// didn't check the client sent data against the object do any. Since the base modules are the
// 'crowning glory' examples of good practice..
// Validate that the object exists in the scene the user is in
SceneObjectPart part = s.GetSceneObjectPart(localID);
if (part == null)
{
remoteClient.SendAgentAlertMessage("Unable to buy now. The object was not found.", false);
return;
}
// Validate that the client sent the price that the object is being sold for
if (part.SalePrice != salePrice)
{
remoteClient.SendAgentAlertMessage("Cannot buy at this price. Buy Failed. If you continue to get this relog.", false);
return;
}
// Validate that the client sent the proper sale type the object has set
if (part.ObjectSaleType != saleType)
{
remoteClient.SendAgentAlertMessage("Cannot buy this way. Buy Failed. If you continue to get this relog.", false);
return;
}
s.PerformObjectBuy(remoteClient, categoryID, localID, saleType);
}
}