Re: OpenSSH sabotages protocol extension

[nisse%lysator.liu.se@localhost (Niels Möller)]

denis bider <ietf-ssh3%denisbider.com@localhost> writes:

> Yes. It disconnects if there's any extra data after the recognized field in SERVICE_ACCEPT.
>
> What possible purpose does this serve?
>
> What possible purpose at all, other than to sabotage future extension?

FYI, my implementation does the same. To me, the spec is pretty clear
that a SSH_MSG_SERVICE_ACCEPT can't include any extra data (unlike,
e.g., SSH_MSG_REQUEST_SUCCESS, SSH_MSG_CHANNEL_OPEN, and
SSH_MSG_CHANNEL_OPEN_CONFIRMATION).

There's the liberal tradition in protocol implementation to allow random
garbage at the end of messages. This has it's merit in some cases, but
in security protocols I tend to require that the protcol is adhered to
to the last bit.

Regards,
/Niels

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