如何通过 PuTTY 的 psftp.exe sudo su

Question

With (PuTTY) PSFTP.exe it is possible to open open a shell script to perform certain actions on Linux.

In this example I am using psftp.exe to open get30.txt file.

%%PROJECT/ROOT_DIRECTORY%%\PuTTY\psftp.exe user@domain.nl -pw password -b "%%PROJECT/ROOT_DIRECTORY%%\Scripts\%%ENVIRONMENT/NAME%%\get30.txt"

In the get30.txt I have the following actions:

sudo su -l4097gps
cd /appl/gps/RIT/IN/30/RAP-T1
chmod 777 GP*.*
get -r /appl/gps/RIT/IN/30/RAP-T1
rm /appl/gps/RIT/IN/30/RAP-T1/*
quit

Unfortunately psftp does not recognise sudo su .

How can I sudo to a different user after I have logged on with my own user?

Answer 1

It's not possible. Those commands you're sending aren't arbitrary shell commands - they're SFTP commands. They happen to look like shell commands (rm, cd, etc), but they're just mirroring the shell equivalents. There is no 'sudo' command in most SFTP implementations, thus, you can't do it.

The only case where I'm wrong is if you're using a custom SFTP server and client that supports 'su', such as the one offered by Van Dyke software. However, you'd be using 'su' there, and be required to authenticate, instead of using 'sudo'.

Additionally, see this post on the serverfault stackoverflow:

How to change user for more rights on a sftp client

Answer 2

The sudo is a shell command, not an SFTP command.

There's no sudo or equivalent in the SFTP protocol in general nor in psftp commands.

Though if you are connecting to an OpenSSH server, you can instruct it to run the SFTP subsystem/server with elevated privileges using a command like:

sudo /bin/sftp-server

Unfortunately the psftp does not allow you to change the command used to launch the SFTP server.

You can use WinSCP instead:

open sftp://user:password@domain.nl/ -rawsettings SftpServer="sudo /bin/sftp-server"

But there's lot of limitations to allow this working. Particularly the sudo may not require password. For details, see WinSCP FAQ How do I change user after login (eg su root)?

See also the guide to converting PuTTY PSFTP script to WinSCP script .

(I'm the author of WinSCP)