get_root_dgnwg05lm.py

#!/usr/bin/env python3
# Requires python3 and pexpect_serial
# Tha script changes root password to toor1984 and enables dropbear
# Should work with dgnwg05lm (lumi.gateway.mieu01)
import sys
import serial
import argparse
from pexpect_serial import SerialSpawn

parser = argparse.ArgumentParser()
parser.add_argument("-p", "--port", required=True, action="store", help="Port of gateway")
args = parser.parse_args(sys.argv[1:])

try:
    ser = serial.Serial(args.port, baudrate=115200)
except:
    print(f'Cant open port {args.port}')
    exit(1)

ss = SerialSpawn(ser)
ss.expect('Hit any key to stop autoboot')
ss.sendline('0')
ss.expect('=>')
ss.sendline('printenv')
ss.expect('bootargs=([^\r\n]+)')
env = ss.match.group(1).decode('utf-8')
print(f'Catched ENV: ##{env}##')
ss.expect('=>')
newenv=f'{env} single rw init=/bin/bash'
print(f'Setting new env: {newenv}')
ss.sendline(f'setenv bootargs {newenv}')
ss.expect('=>')
print('Booting...')
ss.sendline('boot')
ss.expect('bash.*#')
print('Changing root password to toor1984')
ss.sendline('passwd')
ss.expect('New password:')
ss.sendline('toor1984')
ss.expect('Re-enter new password:')
ss.sendline('toor1984')
ss.expect('bash.*#')
print('Enabling dropbear')
ss.sendline('update-rc.d -f dropbear remove')
ss.expect('bash.*#')
ss.sendline('update-rc.d dropbear defaults')
ss.expect('bash.*#')
print('Rebooting')
ss.sendline('mount -o remount,ro /')
ss.expect('bash.*#')
ss.sendline('reboot -f')