[jira] [Work stopped] (SSHD-787) Secure trasnfer file's directoy existence is alway checked (on real FS) no metter of any other settings

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

     [ https://issues.apache.org/jira/browse/SSHD-787?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on SSHD-787 stopped by Goldstein Lyor.
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> Secure trasnfer file's directoy existence is alway checked (on real FS) no metter of any other settings
> -------------------------------------------------------------------------------------------------------
>
>                 Key: SSHD-787
>                 URL: https://issues.apache.org/jira/browse/SSHD-787
>             Project: MINA SSHD
>          Issue Type: New Feature
>            Reporter: jiri vanek
>            Assignee: Goldstein Lyor
>            Priority: Minor
>             Fix For: 1.7.0
>
>
> Hello!
> mina-sshd iss awesomely configurable tool.  It is so powerful, that  it allows  programmer to provide VirtualFileSystem or even more, ScpFileOpener for custom stream.
> However, before any of above comes to play,  the target path is checked by simple nio.File.exists, which successfully kills any afterwards customisations
> This is caused by following chain:
> receiveFile is called first, and alwys calls LocalFileScpTargetStreamResolver
> https://github.com/apache/mina-sshd/blob/master/sshd-core/src/main/java/org/apache/sshd/common/scp/ScpHelper.java#L334
> This is imo the core of bug - the StreamResolver should be replaceable. Or at least it should take in consideration VirtualFileSystem and/or ScpFileOpener, ending like https://github.com/apache/mina-sshd/blob/master/sshd-core/src/main/java/org/apache/sshd/common/scp/helpers/LocalFileScpTargetStreamResolver.java#L91  or any of  many checks *before* there is actual call to custom StreamOpener. Those checks consist from simple path,parene, path.isDirecotry path.isWriteable and simialr.   IMho nothing of this should happen when custom ScpFileOpener is in play. But more likely I'm underestimating some security check.
> I will be happy to implement those fix if we agree on approach.
> Currnetly I have in mind possiblity of custom ScpTargetStreamResolver set in simialr way as StramOpener is, or fixing LocalFileScpTargetStreamResolver so it do nto check if custom StramOpener is in play.
> Background
> I'm usign mina as moreover simple scp-l;ike upload.  Now the system where it runs changed dramatically, so - based on the target path - I need to store the file on completely different place ("backward comaptible upload:) ) or - in addition - to send it over network .
> Due to changes of destinations, I was unsuccessful to use VirtualFileSystem and in case of network forwarding I think I'm domed to StreamOpener anyway.
> Best regards
>   j.



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