Sending a password over SSH or SCP with subprocess.Popen


I’m trying to run an scp (secure copy) command using subprocess.Popen. The login requires that I send a password:

from subprocess import Popen, PIPE

proc = Popen(['scp', "[email protected]:/foo/bar/somefile.txt", "."], stdin = PIPE)

This immediately returns an error:

[email protected]'s password:
Permission denied, please try again.

I’m certain the password is correct. I easily verify it by manually invoking scp on the shell. So why doesn’t this work?

Note, there are many similar questions to this, asking about subprocess.Popen and sending a password for automated SSH or FTP login:

How can I set a users password in linux from a python script?
Use subprocess to send a password

The answer(s) to these questions don’t work and/or don’t apply because I am using Python 3.


The second answer you linked suggests you use Pexpect(which is usually the right way to go about interacting with command line programs that expect input). There is a fork of it which works for python3 which you can use.

Answered By – entropy

This Answer collected from stackoverflow, is licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0

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