[jira] [Work started] (SSHD-777) Make the code handling channels more error tolerant

["Goldstein Lyor (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SSHD-777?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on SSHD-777 started by Goldstein Lyor.
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> 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
>              Labels: channel, exception-handling, session, ssh, sshd
>
> 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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