From: Laszlo Hanyecz <laszlo@heliacal•net>
To: Jeff Garzik <jgarzik@bitpay•com>
Cc: "bitcoin-development@lists•sourceforge.net"
<bitcoin-development@lists•sourceforge.net>
Subject: Re: [Bitcoin-development] Miners MiTM
Date: Fri, 8 Aug 2014 18:34:01 +0000 [thread overview]
Message-ID: <A5697066-6389-4F9A-99E6-B815ADB51006@heliacal.net> (raw)
In-Reply-To: <CAJHLa0NBJo+NFFFZEHNo81KPBwgx05tbuMwtSKMs=07+wCmQgA@mail.gmail.com>
Mutual CHAP could work. This is commonly done in PPP and iSCSI. The idea is simply that both sides authenticate. The server expects the client to provide a password, and the client expects the server to provide a (different) password. If you masquerade as the server, you won't be able to authenticate because every client has a different password they expect from the server, so they won't do work for you. MITM on the server can capture the exchange but CHAP protects against replay.
https://en.wikipedia.org/wiki/Challenge-Handshake_Authentication_Protocol
-Laszlo
On Aug 8, 2014, at 6:21 PM, Jeff Garzik <jgarzik@bitpay•com> wrote:
> gmaxwell noted on IRC that enabling TLS could be functionally, if not
> literally, a DoS on the pool servers. Hence the thought towards a
> more lightweight method that simply prevents client payout redirection
> + server impersonation.
>
>
> On Fri, Aug 8, 2014 at 5:53 AM, Mike Hearn <mike@plan99•net> wrote:
>>> Certificate validation isn't needed unless the attacker can do a direct
>>> MITM
>>> at connection time, which is a lot harder to maintain than injecting a
>>> client.reconnect.
>>
>>
>> Surely the TCP connection will be reset once the route reconfiguration is
>> completed, either by the MITM server or by the client TCP stack when it
>> discovers the server doesn't know about the connection anymore?
>>
>> TLS without cert validation defeats the point, you can still be connected to
>> a MITM at any point by anyone who can simply interrupt or corrupt the
>> stream, forcing a reconnect.
>>
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>
>
>
> --
> Jeff Garzik
> Bitcoin core developer and open source evangelist
> BitPay, Inc. https://bitpay.com/
>
> ------------------------------------------------------------------------------
> Want fast and easy access to all the code in your enterprise? Index and
> search up to 200,000 lines of code with a free copy of Black Duck
> Code Sight - the same software that powers the world's largest code
> search on Ohloh, the Black Duck Open Hub! Try it now.
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> _______________________________________________
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next prev parent reply other threads:[~2014-08-08 18:53 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-07 23:02 Pedro Worcel
2014-08-07 23:45 ` Luke Dashjr
2014-08-08 0:29 ` slush
2014-08-08 0:37 ` Christopher Franko
2014-08-08 1:07 ` Pedro Worcel
2014-08-08 2:22 ` slush
2014-08-08 1:01 ` Luke Dashjr
2014-08-08 9:53 ` Mike Hearn
2014-08-08 18:21 ` Jeff Garzik
2014-08-08 18:27 ` Luke Dashjr
2014-08-08 18:34 ` Laszlo Hanyecz [this message]
2014-08-09 12:15 ` Sergio Lerner
2014-08-08 3:18 ` Jeff Garzik
2014-08-08 9:42 ` Mike Hearn
2014-08-09 19:39 ` Troy Benjegerdes
2014-08-09 19:31 ` Troy Benjegerdes
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