Is there any way a script in Python can change user passwords in Linux? if so, how?

Question

I am trying to write some scripts in Python and stumbled upon the need to do something to update a given user's password on a Linux system ...

UPDATE: the goal is to create a script to automatically update the password from the given data / algorithm. The main thing is not to interfere with human intervention ...

Is there any way to achieve this? or should I look for other means?

Thank!

Answer 1

You can use openssland usermod:

#!/usr/bin/env python
import subprocess

login = 'username'
password = 'somepassword'

# OpenSSL doesn't support stronger hash functions, mkpasswd is preferred
#p = subprocess.Popen(('openssl', 'passwd', '-1', password), stdout=subprocess.PIPE)
p = subprocess.Popen(('mkpasswd', '-m', 'sha-512', password), stdout=subprocess.PIPE)
shadow_password = p.communicate()[0].strip()

if p.returncode != 0:
    print 'Error creating hash for ' + login

r = subprocess.call(('usermod', '-p', shadow_password, login))

if r != 0:
    print 'Error changing password for ' + login

Answer 2

crypt openssl passwd ( )

Juliusz script:

#!/usr/bin/env python
import subprocess,crypt,random

login = 'username'
password = 'somepassword'

ALPHABET = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
salt = ''.join(random.choice(ALPHABET) for i in range(8))

shadow_password = crypt.crypt(password,'$1$'+salt+'$')

r = subprocess.call(('usermod', '-p', shadow_password, login))

if r != 0:
    print 'Error changing password for ' + login

, ( usermod).
ubuntu + python2.6.6 + pycrypto2.5.

Answer 3

, - . , passwd, .

#!/usr/bin/python3    

username = 'joe'

# generate passphrase
pw_length = 6
phrase = subprocess.check_output(['pwgen', str(pw_length), '1'])
phrase = phrase.decode('utf-8').strip()

dev_null = open('/dev/null', 'w')
passwd = subprocess.Popen(['sudo', 'passwd', user], stdin=subprocess.PIPE,
                          stdout=dev_null.fileno(),
                          stderr=subprocess.STDOUT)
passwd.communicate( ((phrase + '\n')*2).encode('utf-8') )
if passwd.returncode != 0:
    raise OSError('password setting failed')

( . , .)

Answer 4

subprocess passwd.