Script to setup Password less ssh between hosts.

Following Python script will setup password less SSH between hosts in Solaris 11.

Hope the Python pkgs are already installed in Soalris 11.

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How to run the script:

# ./setupPasswordlessSSH.py --help
usage: setupPasswordlessSSH.py [-h] [-u USER] [-p PASSWORD] -c CLIENT
                               [CLIENT ...]

optional arguments:
  -h, --help            show this help message and exit
  -u USER, --user USER  Username[Optional] (Default : root)
  -p PASSWORD, --password PASSWORD
                        Password[Optional] (Default : welcome1)
  -c CLIENT [CLIENT ...], --client CLIENT [CLIENT ...]
                        Host or List of Hosts separated by space.
                     
Ex:  ./setupPasswordlessSSH.py -u [<USER>] -p [<your password>] -c Host1 Host2 .. HostN

Note: If you don't specify, default user it takes as 'root'. Also you can update the script and replace 'PASSWORD'  in Help section with your actual password, then no need to use -p option for password.

setupPasswordlessSSH.py [Copy between the lines]
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#!/usr/bin/python
import os
from getpass import getpass
import argparse

##Check and Install Python Lib Pkgs required for this script to run
def inst_pkgs():
   retcde=os.system('pkg list -q library/python/paramiko')
   if retcde!=0:
        print 'Packages "paramiko,paramiko-27" are not found'
        print 'Its required for this script to work. Installing it now....\n'
        os.system('pkg install paramiko')

inst_pkgs()
import paramiko

##Function
def deploy_key(key, server, username, password):
    client = paramiko.SSHClient()
    client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    client.load_host_keys(os.path.expanduser('~/.ssh/known_hosts'))
    client.connect(server, username=username, password=password)
    retcode=os.system('ssh -l %s -oNumberOfPasswordPrompts=0 %s "echo hello" >/dev/null 2>&1' % (username, server))
    if retcode==0:
        print "Password-less SSH is already enabled for:", server
        return
    else:
        client.connect(server, username=username, password=password)
        client.exec_command('mkdir -p ~/.ssh/')
        client.exec_command('echo "%s" >> ~/.ssh/authorized_keys' % key)
        client.exec_command('chmod 644 ~/.ssh/authorized_keys')
        client.exec_command('chmod 700 ~/.ssh/')
        print "Password-less SSH has been setup with:", server

##Help options
parser = argparse.ArgumentParser()
parser.add_argument('-u', '--user', default='root', help="Username[Optional] (Default : root)")
parser.add_argument('-p', '--password', default='PASSWORD', help="Password[Optional] (Default : PASSWORD)")
parser.add_argument('-c', '--client', nargs='+', type=str, default=[], required=True, help="Host or List of Hosts separated by space. Ex: ./<script> -c Host1 Host2 ")

args = parser.parse_args()
## Variables
username = args.user
hosts = args.client
password = args.password
keyfile=os.path.join(os.environ['HOME'] + "/.ssh/id_rsa")

print "User:", username
print "Hostnames:", hosts
print "Password:", password

if not os.path.isfile(keyfile):
    print "RSA is missing, Generating Keypair", keyfile
    os.system('ssh-keygen -t rsa -f %s -q -N "" ' %(keyfile))

os.system('touch ~/.ssh/known_hosts')
key = open(os.path.expanduser('~/.ssh/id_rsa.pub')).read()

for host in hosts:
    deploy_key(key, host, username, password)

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