From: Eric Stokes <eric.stokes@csun.edu>
To: Mike Hamburg <hamburg@fas.harvard.edu>
Cc: "<caml-list@inria.fr>" <caml-list@inria.fr>
Subject: Re: [Caml-list] Safe marshall?
Date: Thu, 17 Feb 2005 15:14:30 -0800 [thread overview]
Message-ID: <9c3c426c52d70a19ad1dc3e3047a5138@csun.edu> (raw)
In-Reply-To: <21947.192.168.0.1.1108633144.squirrel@gps.dynxs.de>
I have to agree with Gerd, if at all possible use a protocol compiler
such as XDR, or ASN.1, even signing might not be secure if your
attacker can get ahold of the keys you are using. I can attest to the
robustness of Gerd's XDR implementation, I have used it in several
projects.
On Feb 17, 2005, at 1:39 AM, Gerd Stolpmann wrote:
> Mike Hamburg said:
>> Is there any way to call Marshall in a type-safe way? I need to use
>> marshaling for a networking program, and I'd rather not leave Marshal
>> as an arbitrary code execution vulnerability (which it is as far as I
>> can tell: switching on a Marshaled value should produce a computed
>> jump, which can be set by an attacker to point to an arbitrary place).
>> Am I stuck writing my own marshal function?
>
> Marshal is not type-safe, no chance. I see three options for you:
>
> - If it is a closed protocol, you can sign the marshaled values
>
> - You can use other serializers. A quite simple and fast serializer is
> the
> XDR encoder in my SunRPC implementation (see
> http://ocaml-programming.de/programming/rpc.html). Other options
> I know are BER (see ocamldap), XML-RPC, SOAP, and Ensemble.
>
> - Write the serializer yourself. Maybe this is an option for you
> if you need maximum performance.
>
> Gerd
> ------------------------------------------------------------
> Gerd Stolpmann * Viktoriastr. 45 * 64293 Darmstadt * Germany
> gerd@gerd-stolpmann.de http://www.gerd-stolpmann.de
> ------------------------------------------------------------
>
>
>
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next prev parent reply other threads:[~2005-02-17 23:14 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-16 22:07 Mike Hamburg
2005-02-16 22:55 ` [Caml-list] " Oliver Bandel
2005-02-17 0:11 ` Mike Hamburg
2005-02-18 5:26 ` Oliver Bandel
2005-02-17 9:39 ` Gerd Stolpmann
2005-02-17 23:14 ` Eric Stokes [this message]
2005-02-18 5:29 ` Oliver Bandel
2005-02-18 9:41 ` Gerd Stolpmann
2005-02-18 10:10 ` Gerd Stolpmann
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