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From Oliver Stöneberg (JIRA) <j...@apache.org>
Subject [jira] [Created] (SSHD-614) SCP upload fails with dropbear server (aka server with paket size limitation)
Date Tue, 15 Dec 2015 08:41:46 GMT
Oliver Stöneberg created SSHD-614:

             Summary: SCP upload fails with dropbear server (aka server with paket size limitation)
                 Key: SSHD-614
                 URL: https://issues.apache.org/jira/browse/SSHD-614
             Project: MINA SSHD
          Issue Type: Bug
            Reporter: Oliver Stöneberg
         Attachments: dropbear_not_working.log, openssh_working.log

When trying to upload a file via SCP to a server running dropbear I get the following error:

java.io.EOFException: readAck - EOF before ACK -  
at org.apache.sshd.common.scp.ScpHelper.readAck() in ScpHelper.java:703. 
at org.apache.sshd.common.scp.ScpHelper.sendStream() in ScpHelper.java:539. 
at org.apache.sshd.client.scp.DefaultScpClient.upload() in DefaultScpClient.java:104. 
at org.apache.sshd.client.scp.AbstractScpClient.upload() in AbstractScpClient.java:201. 

The main difference between dropbear and OpenSSH I have encountered is that dropbear has a
paket size limitation in place by default. That's the reason in the first place why I even
need to upload files via SCP since using trying to execute bigger scripts via an exec channel
it will fail. I attached logs from the system that fails and another system. The main difference
seems to be this:

working (OpenSSH):
DEBUG [sshd-SshClient[51a8313b]-nio2-thread-9] (AbstractConnectionService.java:236) channelOpenConfirmation(ChannelExec[id=0,
recipient=-1]-ClientSessionImpl[sshtest@XXXXXXXXX.XXXX.XXX/XX.XX.XX.XXX:22]) Received SSH_MSG_CHANNEL_OPEN_CONFIRMATION
DEBUG [sshd-SshClient[51a8313b]-nio2-thread-9] (AbstractChannel.java:121) setRecipient(ChannelExec[id=0,
recipient=-1]-ClientSessionImpl[sshtest@XXXXXXXXX.XXXX.XXX/XX.XX.XX.XXX:22]) recipient=0
DEBUG [sshd-SshClient[51a8313b]-nio2-thread-9] (Window.java:122) init(ChannelExec[id=0, recipient=0]-ClientSessionImpl[sshtest@XXXXXXXXX.XXXX.XXX/XX.XX.XX.XXX:22]:
client remote window) size=0, max.=0, packet=32768
DEBUG [sshd-SshClient[51a8313b]-nio2-thread-9] (ChannelExec.java:47) doOpen(ChannelExec[id=0,
recipient=0]-ClientSessionImpl[sshtest@XXXXXXXXX.XXXX.XXX/XX.XX.XX.XXX:22]) send SSH_MSG_CHANNEL_REQUEST
exec command=scp -p -t -- /tmp/XXXXX_script.sh

not working (dropbear):
DEBUG [sshd-SshClient[11389053]-nio2-thread-7] (AbstractConnectionService.java:236) channelOpenConfirmation(ChannelExec[id=0,
recipient=-1]-ClientSessionImpl[test@/XX.XX.XX.XXX:44]) Received SSH_MSG_CHANNEL_OPEN_CONFIRMATION
DEBUG [sshd-SshClient[11389053]-nio2-thread-7] (AbstractChannel.java:121) setRecipient(ChannelExec[id=0,
recipient=-1]-ClientSessionImpl[test@/XX.XX.XX.XXX:44]) recipient=0
DEBUG [sshd-SshClient[11389053]-nio2-thread-7] (Window.java:122) init(ChannelExec[id=0, recipient=0]-ClientSessionImpl[test@/XX.XX.XX.XXX:44]:
client remote window) size=24576, max.=24576, packet=32759
DEBUG [sshd-SshClient[11389053]-nio2-thread-7] (ChannelExec.java:47) doOpen(ChannelExec[id=0,
recipient=0]-ClientSessionImpl[test@/XX.XX.XX.XXX:44]) send SSH_MSG_CHANNEL_REQUEST exec command=scp
-p -t -- /tmp/XXXXX_script.sh

As you can see that's a min/max set for the not working dropbear.

There's also two typos in this log message (the additional whitespace at "client local" and
the period at "max":
DEBUG [forceDeviceActionAsync] (Window.java:122) init(ChannelExec[id=0, recipient=-1]-ClientSessionImpl[test@/]:
client local  window) size=2097152, max.=2097152, packet=32768

I am using the latest version of master.

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