Using python with SSH?

[Steve]

Hi,

I need to run a remote program from a server that I have access rights
to. I want to be able to do this from within in my python script and I
want to use ssh (or anything else that will work). However, doing
something like:

ssh -l user host "/path/to/program"

prompts for a password and I don't know how to supply one via a python
script. Is there an easy way out? Can I log onto to the other machine
via ssh somehow? Does a python script support this? Thanks!

Steve

[Paul Rubin]

Re: Using python with SSH?

Steve <nospam@nopes > writes:[color=blue]
> ssh -l user host "/path/to/program"
>
> prompts for a password and I don't know how to supply one via a python
> script. Is there an easy way out? Can I log onto to the other machine
> via ssh somehow? Does a python script support this? Thanks![/color]

The simplest way is to set up ssh at both ends with RSA authentication
and have a private key on the local machine. That gets rid of the
need for a password, while still keeping the connection secure, as
long as the local machine is secure.

[Lawrence Oluyede]

Re: Using python with SSH?

Steve <nospam@nopes > writes:
[color=blue]
> ssh -l user host "/path/to/program"
>
> prompts for a password and I don't know how to supply one via a python
> script. Is there an easy way out? Can I log onto to the other machine via
> ssh somehow? Does a python script support this? Thanks![/color]

Try something like this:

import os

ssh_pipe = os.popen("ssh -l user path")
ssh_pipe.write( password)
ssh_pipe.write( "\n")
ssh_pipe.flush( )
ssh_pipe.close( )

hope this helps

--
Lawrence "Rhymes" Oluyede

http://loluyede.blogspot.com

[Jp Calderone]

Re: Using python with SSH?

On Thu, Dec 18, 2003 at 12:08:43AM +0100, Lawrence Oluyede wrote:[color=blue]
> Steve <nospam@nopes > writes:
>[color=green]
> > ssh -l user host "/path/to/program"
> >
> > prompts for a password and I don't know how to supply one via a python
> > script. Is there an easy way out? Can I log onto to the other machine via
> > ssh somehow? Does a python script support this? Thanks![/color]
>[/color]

You could open ssh in a pty, or you could use a Python module that speaks
the SSH protocol, thus obviating the requirement to call out to the ssh
command line program.

A couple choices for such modules:

http:/www.twistedmatr ix.com/

http://www.lag.net/~robey/secsh/

[color=blue]
> Try something like this:
>
> import os
>
> ssh_pipe = os.popen("ssh -l user path")
> ssh_pipe.write( password)
> ssh_pipe.write( "\n")
> ssh_pipe.flush( )
> ssh_pipe.close( )
>
> hope this helps[/color]

It does not. ssh won't accept a password from standard input, it requires
it to be entered into the terminal.

Jp

[Lawrence Oluyede]

Re: Using python with SSH?

Jp Calderone <exarkun@intarw eb.us> writes:
[color=blue]
> It does not. ssh won't accept a password from standard input, it requires
> it to be entered into the terminal.[/color]

Ah ok, i thought it did.

--
Lawrence "Rhymes" Oluyede

http://loluyede.blogspot.com

[Martin Franklin]

Re: Using python with SSH?

On Wed, 2003-12-17 at 23:00, Steve wrote:[color=blue]
> Hi,
>
> I need to run a remote program from a server that I have access rights
> to. I want to be able to do this from within in my python script and I
> want to use ssh (or anything else that will work). However, doing
> something like:
>
> ssh -l user host "/path/to/program"
>
> prompts for a password and I don't know how to supply one via a python
> script. Is there an easy way out? Can I log onto to the other machine
> via ssh somehow? Does a python script support this? Thanks!
>
> Steve[/color]

Steve,


You don't say if you are running on Windows or not but this is a ssh
wrapper I use that uses the pexpect library...:


import pexpect
import sys
import re
import os


PROMPT = "\$|\%|\>"


class SSH:
def __init__(self, user, password, host):
self.child = pexpect.spawn(" ssh %s@%s"%(user, host))
i = self.child.expe ct(['assword:', r"yes/no"], timeout=120)
if i==0:
self.child.send line(password)
elif i==1:
self.child.send line("yes")
self.child.expe ct("assword:", timeout=120)
self.child.send line(password)
self.child.expe ct(PROMPT)


def command(self, command):
"""send a command and return the response"""
self.child.send line(command)
self.child.expe ct(PROMPT)
response = self.child.befo re
return response

def close(self):
"""close the connection"""
self.child.clos e()


if __name__=="__ma in__":
import getpass
password = getpass.getpass ("Password: ")
ssh = SSH("RemoteUser name", password, "RemoteHost ")
print ssh.command("pw d")
ssh.close()






--
Martin Franklin <mfranklin1@gat wick.westerngec o.slb.com>

[Albert Hofkamp]

Re: Using python with SSH?

On Thu, 18 Dec 2003 10:06:02 +0000, Martin Franklin <mfranklin1@gat wick.westerngec o.slb.com> wrote:[color=blue]
> On Wed, 2003-12-17 at 23:00, Steve wrote:[color=green]
>> Hi,
>>
>> I need to run a remote program from a server that I have access rights
>> to. I want to be able to do this from within in my python script and I
>> want to use ssh (or anything else that will work). However, doing
>> something like:
>>
>> ssh -l user host "/path/to/program"
>>
>> prompts for a password and I don't know how to supply one via a python
>> script. Is there an easy way out? Can I log onto to the other machine[/color][/color]

If your sysadmin allows it, you can configure ssh to connect to another
machine without prompting for a password, at least at Linux systems.


Albert
--
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