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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Work logged] (SSHD-903) SFTP version negotiation does not work
Date Fri, 01 Mar 2019 04:50:00 GMT

     [ https://issues.apache.org/jira/browse/SSHD-903?focusedWorklogId=206230&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-206230

ASF GitHub Bot logged work on SSHD-903:

                Author: ASF GitHub Bot
            Created on: 01/Mar/19 04:49
            Start Date: 01/Mar/19 04:49
    Worklog Time Spent: 10m 
      Work Description: lgoldstein commented on pull request #96: [SSHD-903] Fixed the SFTP
version negotiation behavior in case client proposed version is higher than server supported
URL: https://github.com/apache/mina-sshd/pull/96
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Issue Time Tracking

    Worklog Id:     (was: 206230)
    Time Spent: 20m  (was: 10m)

> SFTP version negotiation does not work  
> ----------------------------------------
>                 Key: SSHD-903
>                 URL: https://issues.apache.org/jira/browse/SSHD-903
>             Project: MINA SSHD
>          Issue Type: Bug
>    Affects Versions: 2.2.0
>            Reporter: Mark Ebbers
>            Assignee: Goldstein Lyor
>            Priority: Major
>         Attachments: screenshot-winscp-sftp-version.png, sftp-version-1.png, sftp-version-2.png,
winscp-info.png, winscp.png
>          Time Spent: 20m
>  Remaining Estimate: 0h
> I have some problems with uploading files to our MINA SSHD based SFTP server when using
,different version, of WinSCP as SFTP client. WinSCP is configured to use version 6 of the
SFTP protocol if possible. 
> Uploading a file of ~ 45KB sometimes result in a file of 32711 bytes where in the data
is not appended (from the second SFTP packet) but overwritten. (But did not pin point the
exact bug)
> As a temporary solution I found, in issue SSHD-874, a comment which suggest to force
the server to use sftp-protocol version 3. If I do this I expect the server to negotiate
with the client that version 3 should be used instead of version 6. But what happens is that
the server sends a not supported message.
> I think that the AbstractSftpSubsystemHelper::checkVersionCompatibility() is the problem.
> See my screenshots. As you can see the version proposed by WinSCP is version 6. I forced
the server on version 3.

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