You are viewing a plain text version of this content. The canonical link for it is here.

Posted to dev@mina.apache.org by "Fulvio Cavarretta (JIRA)" <ji...@apache.org> on 2018/02/01 17:16:00 UTC

[jira] [Created] (SSHD-800) SSHD port forwarding. Wrong SSH_MSG_CHANNEL_FAILURE

Fulvio Cavarretta created SSHD-800:
--------------------------------------

             Summary: SSHD port forwarding. Wrong SSH_MSG_CHANNEL_FAILURE
                 Key: SSHD-800
                 URL: https://issues.apache.org/jira/browse/SSHD-800
             Project: MINA SSHD
          Issue Type: Bug
    Affects Versions: 1.7.0
            Reporter: Fulvio Cavarretta


Hi in case the SSHD server receives a message for a not existing channel, it sends back a _SSH_MSG_CHANNEL_FAILURE_.

This behaviour is not described in RFC4254, which, I agree, is unclear about what should be do in this case.

Since the current SSHD implementation send back a _SSH_MSG_CHANNEL_FAILURE_ message (with the local channel id), in our environment, it put the receipient in an inconsistent state. 



In out enviroment happened that the receipient has sent a _SSH_MSG_CHANNEL_DATA_ while SSHD had already closed the channel.

I fully agree that this should not happen (I will open another issue about this) but the _SSH_MSG_CHANNEL_FAILURE_ further complicates things.



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)