Python fabric - run method is not being finished

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Hi There,
I've prepared a piece of code, which intention is to log as a root user.
I can't use "sudo" method because that is not existing on the system that i want to control and logging directly as "root" is impossible. My idea is to log as a "admin" user and then use "su" command to switch to "root" user.

Section below contains code that is almost working for me. Any ideas how to solve that? Thanks in advance:)

What I have tried:

My environment:
Python 3.7
Fabric 2.4.0

Code:

Python

from fabric import Connection
from invoke import Responder

sudopass = Responder(pattern=r'Password:', response='adminPassword\n')

with Connection('192.168.0.106', user="admin", port=22, connect_kwargs={"password": "admin"}) as dss:
    command = "uname -s"
    print("Response on {} is: {}".format(command, dss.run(command)))
    command = "whoami"
    print("Response on {} is: {}".format(command, dss.run(command)))
    command = "su"
    print("Response on {} is after executing su command: {}".format(command,
                                                                    dss.run(command, pty=True, watchers=[sudopass])))
    command = "whoami"
    print("Response on {} is: {}".format(command, dss.run(command)))
print("Script end")

Output:

Linux
Response on uname -s is: Command exited with status 0.
=== stdout ===
Linux

(no stderr)
dssadmin
Response on whoami is: Command exited with status 0.
=== stdout ===
dssadmin

(no stderr)
Password: 
/home/dssadmin #

As you can see script got stuck after sending "su" command.

Posted 28-Dec-18 6:34am

MateoGlowinski

Updated 28-Dec-18 23:40pm

v2

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Comments

Richard MacCutchan 29-Dec-18 4:10am

You need to talk to the owner of the Linux system. It may be that there are restrictions on using su.

MateoGlowinski 29-Dec-18 5:36am

No, there are not. It's linux version prepared by our company, which is not including sudo command

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MateoGlowinski · Answer 1 · 2018-12-28T23:41:00

I've found solution:

Python

sudopass = Responder(pattern=r'Password:', response='admin__password\n')

def su(connection, command) -> int:
    return connection.run(f"su -c '{command}'", pty=True, watchers=[sudopass])

Python

with Connection('192.168.0.106', user="dssadmin", port=22, connect_kwargs={"password": "password"}) as ssh_connection:
    command = "uname -s"
    print("Response on {} is: {}".format(command, ssh_connection.run(command)))
    command = "whoami"
    print("Response on {} is: {}".format(command, ssh_connection.run(command)))
    command = "opkg update"
    print("Response on {} is after executing su command: {}".format(command, su(ssh_connection, command)))
   command = "opkg install rescue-utils"
    print("Response on {} is after executing su command: {}".format(command, su(ssh_connection, command)))
    command = "whoami"
    print("Response on {} is: {}".format(command, su(dss, command)))
print("Script end")

Python fabric - run method is not being finished

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