Re: Preventing Denial of Service Attack In IPC Serialization

Le Chaud Lapin <>
Tue, 5 Jun 2007 20:36:18 CST
On Jun 5, 10:50 am, Geert-Jan Giezeman <> wrote:

class MaxNFilter : public SocketInterface {
     MaxNFilter(size_t bytesLimit, SocketInterface &socket);
     // pass on calls to socket, but throw 'TooManyBytes' if more than
     // bytesLimit were read.


That's an interesting idea and doable in my framework. I considered
it, then cast it aside in split second as I often do with ideas when
they seem suboptimal. In retrospect, it is looking increasingly like
the only one that will keep me sane.

The key is the what it means when bytesLimit is exceeded. Naturally,
resets will have to happen for the bytesLimit. Sending a few 100MB
file will ruin a bytesLimit that is defined and unchanged for the
lifetime of the socket.

Since I control the design of my Socket class, if I followed this
technique, I would integrate MaxNFilter directly into the socket

It is certainly an idea worth exploring.

-Le Chaud Lapin-

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