Goldstein Lyor created SSHD-777:
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Summary: Make the code handling channels more error tolerant
Key: SSHD-777
URL: https://issues.apache.org/jira/browse/SSHD-777
Project: MINA SSHD
Issue Type: Improvement
Affects Versions: 1.6.0
Reporter: Goldstein Lyor
Assignee: Goldstein Lyor
h5. Background
[RFC 4254|https://tools.ietf.org/html/rfc4254] describes the channels protocol,
but it does not seem to contain any clear recommendation as to how to handle
protocol errors - except for the channel setup phase. In other words, once a
channel is established, there is no way to signal to the peer that it has
violated the protocol by sending a malformed message, an unexpected one or even
one that references an unknown channel.
The current code usually throws an exception that causes the *session* to
terminate as well (except for EOF, CLOSE and WINDOW_ADJUST) - as demonstrated
by SSHD-776. The discussions of this issue have also raised the claim that the
code should be "tolerant" as to such channel exception and not affect the whole
session.
h5. Implementation details
* Consider adding a {{ChannelErrorMessageHandler}} that users can register that
can regulate this behavior and let the user decide how to handle the exception.
* Provide some built-in implementations - e.g., IGNORE (default ?) and FAIL
(closes the session)
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