[Bug 1818] SSH2_MSG_CHANNEL_FAILURE on closed channel

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=1818

--- Comment #22 from Simon Tatham <anakin at pobox.com> ---
Created attachment 2431
  --> https://bugzilla.mindrot.org/attachment.cgi?id=2431&action=edit
improved fix handling both client and server

This issue has come up again recently and is currently under discussion
on ietf-ssh. The general consensus seems to be that RFC 4254 has an
ambiguity in it and that we should issue a clarification saying that
responses to any outstanding or future channel requests should be
implied by CHANNEL_CLOSE, and hence no actual reply messages should be
sent after sending CHANNEL_CLOSE.

OpenSSH is the only implementation I know of which does not do this
(and PuTTY's window size tuning mechanism does cause us to notice...),
so could I request higher priority on fixing it, please? I've attached
a patch that I think is right.

(I notice that I've attached a patch before, but it only dealt with the
server side; this does the same thing on the client side too. I've only
been able to test the server-side fix, but the client-side fix matches
it as far as I can see so it should be right.)

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