ssh to remote machine with password in script via python

Question

I am working with remote machine. I had to ssh everytime i need verification of file update time and there are multiple scripts which will do ssh to the remote machine. I look over internet but couldn't find according to my requirements.

I am trying to find a python script which uses ssh and the password is also in the script because my python scripts will check every 5 minutes the file modification times and i cannot enter password everytime the script execute. I tried these codes from SO and internet but couldn't fulfil my need. Establish ssh session by giving password using script in python

How to execute a process remotely using python

Also I enter into one remote machine through ssh simply.then I am trying to ssh but via python script to another remote machine cox this python script also include code to check the modification time of different files.. mean i already ssh to one remote machine and then i want to run some python scripts from there which checks file modification time of files on another remote machine. Is there a simple way to ssh remote machine along with password in python script. . I would be grateful.

why not setup [ssh keys ] (thegeekstuff.com/2008/11/…) . You don't need a password then? — Macintosh_89
– Macintosh_89, Commented Aug 10, 2017 at 14:05
@Macintosh_89 but i am running some scripts from one remote machine on another. mean i already ssh to one remote machine and then i am running some python scripts which checks file modification time of files on another remote machine. that why i am looking for simple script which include ssh to remote machine along with password option in it. — robbin
– robbin, Commented Aug 10, 2017 at 14:09
you can also use subprocess.call() in combination with the bash command expect check stackoverflow.com/questions/16928004/… and stackoverflow.com/questions/4780893/… — alec_djinn
– alec_djinn, Commented Aug 10, 2017 at 14:14

Ajay2588 · Accepted Answer · 2017-08-10 14:15:13Z

3

If you want to try paramiko module. Here is a sample working python script.

import paramiko

def start_connection():
    u_name = 'root'
    pswd = ''
    port = 22
    r_ip = '198.x.x.x'
    sec_key = '/mycert.ppk'

    myconn = paramiko.SSHClient()
    myconn.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    my_rsa_key = paramiko.RSAKey.from_private_key_file(sec_key)

    session = myconn.connect(r_ip, username =u_name, password=pswd, port=port,pkey=my_rsa_key)

    remote_cmd = 'ifconfig'
    (stdin, stdout, stderr) = myconn.exec_command(remote_cmd)
    print("{}".format(stdout.read()))
    print("{}".format(type(myconn)))
    print("Options available to deal with the connectios are many like\n{}".format(dir(myconn)))
    myconn.close()


if __name__ == '__main__':
    start_connection()

answered Aug 10, 2017 at 14:15

Ajay2588

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9 Comments

Ajay2588 Over a year ago

ssh is a secure protocol, which take key pairs to make connection secure, Check out this. sec_key='/mycert.ppk' is an absolute path to my private key. You/machine should be having one.

robbin Over a year ago

Thanks, i will give it a try. hopefully it will solve my problem. i am new to ssh and remote machine connections. thats why I ask

Ajay2588 Over a year ago

no worries, you can ask me if script is not yet clear to you.

robbin Over a year ago

this paramiko should also be installed on remote machine?. .is there any other way to do it. i generate key pairs but i am avoiding to install paramiko on remote machine. .

robbin Over a year ago

I installed the paramiko on remote machine, then i receive that enum module is not define. i installed that, ,now it shows that "ImportError: No module named pyasn1.type.univ ". Any idea how to deal with this error

|

Gopu · Accepted Answer · 2017-08-29 09:25:45Z

Adding my program as well here which relies on the user password and displays the status on different output files.

#!/bin/python3
import threading, time, paramiko, socket, getpass
from queue import Queue
locke1 = threading.Lock()
q = Queue()

#Check the login
def check_hostname(host_name, pw_r):
    with locke1:
        print ("Checking hostname :"+str(host_name)+" with " + threading.current_thread().name)
        file_output = open('output_file','a')
        file_success = open('success_file','a')
        file_failed = open('failed_file','a')
        file_error = open('error_file','a')
        ssh = paramiko.SSHClient()
        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        try:
          ssh.connect(host_name, username='root', password=pw_r, timeout=5)
          #print ("Success")
          file_success.write(str(host_name+"\n"))
          file_success.close()
          file_output.write("success: "+str(host_name+"\n"))
          file_output.close()

          # printing output if required from remote machine
          #stdin,stdout,stderr = ssh.exec_command("hostname&&uptime")
          #for line in stdout.readlines():
           # print (line.strip())

        except paramiko.SSHException:
                # print ("error")
                file_failed.write(str(host_name+"\n"))
                file_failed.close()
                file_output.write("failed: "+str(host_name+"\n"))
                file_output.close()
                #quit()
        except paramiko.ssh_exception.NoValidConnectionsError:
                #print ("might be windows------------")
                file_output.write("failed: " + str(host_name + "\n"))
                file_output.close()
                file_failed.write(str(host_name+"\n"))
                file_failed.close()
                #quit()
        except socket.gaierror:
          #print ("wrong hostname/dns************")
          file_output.write("error: "+str(host_name+"\n"))
          file_output.close()
          file_error.write(str(host_name + "\n"))
          file_error.close()

        except socket.timeout:
           #print ("No Ping %%%%%%%%%%%%")
           file_output.write("error: "+str(host_name+"\n"))
           file_output.close()
           file_error.write(str(host_name + "\n"))
           file_error.close()

        ssh.close()


def performer1():
    while True:
        hostname_value = q.get()
        check_hostname(hostname_value,pw_sent)
        q.task_done()

if __name__ == '__main__':

    print ("This script checks all the hostnames in the input_file with your standard password and write the outputs in below files: \n1.file_output\n2.file_success \n3.file_failed \n4.file_error \n")

    f = open('output_file', 'w')
    f.write("-------Output of all hosts-------\n")
    f.close()
    f = open('success_file', 'w')
    f.write("-------Success hosts-------\n")
    f.close()
    f = open('failed_file', 'w')
    f.write("-------Failed hosts-------\n")
    f.close()
    f = open('error_file', 'w')
    f.write("-------Hosts with error-------\n")
    f.close()

    with open("input_file") as f:
        hostname1 = f.read().splitlines()

#Read the standard password from the user
    pw_sent=getpass.getpass("Enter the Password:")
    start_time1 = time.time()

    for i in hostname1:
        q.put(i)
    #print ("all the hostname : "+str(list(q.queue)))
    for no_of_threads in range(10):
        t = threading.Thread(target=performer1)
        t.daemon=True
        t.start()

    q.join()
    print ("Check output files for results")
    print ("completed task in" + str(time.time()-start_time1) + "seconds")

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