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Posted to dev@mina.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2019/02/28 15:40:00 UTC
[jira] [Work logged] (SSHD-903) SFTP version negotiation does not
work
[ https://issues.apache.org/jira/browse/SSHD-903?focusedWorklogId=205843&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-205843 ]
ASF GitHub Bot logged work on SSHD-903:
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Author: ASF GitHub Bot
Created on: 28/Feb/19 15:39
Start Date: 28/Feb/19 15:39
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 one
URL: https://github.com/apache/mina-sshd/pull/96
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Issue Time Tracking
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Worklog Id: (was: 205843)
Time Spent: 10m
Remaining Estimate: 0h
> 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: 10m
> 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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