[JSch-users] How to get super permission when using ChannelSftp ?

[艾超]

Hello there!
I've been using Jsch for several months on a business project, and I've got this problem:


When using ChannelExec, I can mock a SUDO execution just like in the Jsch examples ( which is using the sudo -S -p '' <command> trick ), it's totally OK and working.
However as to ChannelSftp, I can't find any examples showing how to do a SUDO put/get (when of course, the sftp user on that linux box has super permission and can do sudo ... in the interactive shell ).
Is there a way to do SUDO put/get using ChannelSftp ? if yes, how to do that ? Maybe it needs some modification/extension to Jsch source, but is it possible ?


Any advice will be appreciated, thanks in advance.


Aich,
Best Regards

[Lothar Kimmeringer]

Is there a way to do /SUDO put/get/ using ChannelSftp ? if yes,
how to do that ? Maybe it needs some modification/extension to
Jsch source, but is it possible ?

I don't think so. The SFTP subsystem uses no shell and only
supports the SFTP commands being defined by the standard.
AFAIR there is no SUDO-command and SFTP doesn't come with
a site-command as you might know it from FTP, either.


Cheers, Lothar

[a1c1]

It's the sftp subsystem in Linux's SSH implementation that blocks the way
to get Sudo permission in sftp. Jsch is merely a re-implementation of SSH
protocol and for compatibility purpose, it just can't do that. The problem
lies in the sftp-server implementation, which is now deployed in nearly
every linux box. You've got a mission impossible, if you insist on doing
SUDO put/get with Jsch ChannelSftp.

------------------------------
Regards
​,​
h
​adoop90
​

Post by Lothar Kimmeringer

Is there a way to do /SUDO put/get/ using ChannelSftp ? if yes,
how to do that ? Maybe it needs some modification/extension to
Jsch source, but is it possible ?

I don't think so. The SFTP subsystem uses no shell and only
supports the SFTP commands being defined by the standard.
AFAIR there is no SUDO-command and SFTP doesn't come with
a site-command as you might know it from FTP, either.
Cheers, Lothar
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